ST EVAL-RHRICL1ATV1 User manual

Introduction
This user manual provides an overview of the EVAL-RHRICL1ATV1, EVAL-RHRICL1ALV1 and EVAL-RHRICL1AFV1 evaluation
boards developed for the RHRPMICL1A, rad-hard integrated current limiter IC. One evaluation board for each of the three
operative modes of the RHRPMICL1A is available. Each evaluation tool includes all external components, needed for a
complete electrical evaluation of the device functionality in the selected configuration.
Table 1. Application tools
Type Part number Configuration Marking
Evaluation tools EVAL-RHRICL1ATV1 Re-triggerable RHRPMICL1ATV1 -RE-TRIGGERABLE
Evaluation tools EVAL-RHRICL1ALV1 Latched RHRPMICL1ALV1 - LATCHED ON/OFF
Evaluation tools EVAL-RHRICL1AFV1 Foldback RHRPMICL1AFV1 --FOLDBACK
Figure 1. EVAL-RHRICL1ATV1 (re-triggerable) Figure 2. EVAL-RHRICL1ALV1 (latched evaluation board)
Figure 3. EVAL-RHRICL1AFV1 (foldback evaluation board)
EVAL-RHRICL1ATV1, EVAL-RHRICL1ALV1, EVAL-RHRICL1AFV1 evaluation
boards for the RHRPMICL1A
UM2605
User manual
UM2605 - Rev 1 - July 2019
For further information contact your local STMicroelectronics sales office.
www.st.com

1Description
The RHRPMICL1A is an integrated current limiter designed to work as a high-side gate driver or intelligent power
switch driver, with an external P-channel power MOSFET. It can be used as a universal solution to protect a
power supply (from 8.5 V) from anomalous external current demand (for example, even in case of a short-circuit
condition).
The device can operate with a supply voltage range from 8.5 V to 52 V. An undervoltage lockout circuitry
guarantees the appropriate power supply integrity.
As the device can operate in floating ground configuration, in this user manual GND, the ground pin of the
RHRPMICL1A device (pin 7), and MGND the ground of main bus are defined.
In case of overload, the device behavior changes according to its configured mode of operation:
•Latched mode, the device provides current limitation capability for an external configurable time, called trip-
off time, and if the overcurrent condition exceeds this time, the device switches OFF. In this case, the device
may be switched ON again through the telecommand pin only or a UVLO deactivation/activation cycle
•Re-triggerable mode, after the trip-off time, that is externally configurable, the device switches OFF and
remains in this state for a recovery time that is externally configurable. Once this time elapses, the device
recovers its typical operation mode if the overload condition disappears, otherwise it switches cyclically ON
and OFF again while the overload persists (hic-up mode)
•Foldback mode, in case of overload, the device provides current limitation with a value decreasing in
tracking with the output voltage, reaching a fixed and safe value even if a short-circuit persists
The mode of operation can be selected by configuring the RHRPMICL1A pins according to the following
configuration table, which is implemented in the evaluation boards:
Table 2. Applicable tools
Mode SET_FLB SET_STS TC_ON TC_OFF TON TOFF Status at
power-up
Latched OFF 0 0 Telecommand Telecommand CON GND(1) OFF
Latched ON 0 1 Telecommand Telecommand CON GND(1) ON
Re-triggerable 0 1 Vcc Vcc CON COFF ON
Foldback 1 1 Vcc Vcc GND(1) GND(1) ON
1. GND refers to the RHRPMICL1A GND pin (pin 7), not to the main system ground (MGND).
The characteristics and the main functionalities of each demonstration board are described in the following
sections.
UM2605
Description
UM2605 - Rev 1 page 2/27

2Common features and parameters
This section describes the features that are in common to the three boards, such as: UVLO, floating ground
configuration, current limitation, analog and digital telemetries, and explains how to customize them by changing
the external components on the board.
2.1 Undervoltage lockout and hysteresis settings
The UVLO and hysteresis can be programmed by a set of three resistors: the RHYS, RUVLO and RV.
A 220 kΩ resistor is generally used for RV, the other two resistors are obtained by the following equations:
RUVLO =2.5*RV
VTH_ON −2.5 − K (1)
RUVLO =2.5*RV
VTH_OFF −2.5 − RUVLO (2)
Where K=150 is a corrective fixed value to be added to Eq. (1) in order to take into account that during the rising
phase of supply voltage, in the UVLO external resistor divider, RHYS is shorted by a non-ideal switch embedded in
the RHRPMICL1A.
2.2 Gate driving
The driver circuit is designed to drive an external P-channel power MOSFET (connected in high-side
configuration) providing on the Vg pin a voltage signal in the range VCC down to (VCC - 12 V). All the evaluation
boards are equipped with a through-hole socket where the power MOSFET can be easily housed.
When the device is ON and no current limitation is active, the Vg node is pulled down and the gate of the external
MOSFET is internally clamped, about 12 V below the supply voltage VCC. When the MOSFET has to be switched
OFF, Vg is brought up to VCC.
When the MOSFET is in current limitation mode, the Vg voltage is a value inside the range [VCC-12 V, VCC],
defined by the limitation control loop.
2.3 Current sense and limitation function
The voltage drop on the external RSENSE resistor is continuously monitored (by ISNS+ and ISNS- pins) and
compared with a fixed 100 mV internally generated threshold.
The current limitation threshold can be externally set according to the application requirements by a suitable
choice of the RSENSE resistor.
In the re-triggerable and latched evaluation boards it is:
ILIM = 100mV/RSENSE (3)
If the voltage drop on RSENSE exceeds 100 mV means that the current demand is becoming excessive: an
internal timer starts counting the trip-off time TON and the device enters the current limitation mode. In such a
condition the limitation control loop is enabled in order to force Vg to the proper voltage level, limiting the current
to the load.
Please refer Section 5.1.2.2 Bill of material of the EVAL-RHRICL1AFV1 board for the current limitation settings
in the foldback mode evaluation board.
2.4 Floating ground configuration
The evaluation boards are equipped with the RGND floating resistance mounted between the GND pin of the ICL
(GND) and the system ground (MGND).
An embedded 14.8 V Zener diode chain allows the device to operate in floating ground configuration and protects
the ICL device as its internal voltage supply is clamped at VZ ~ 15 V (14.8 V typ).
According to the voltage value of the Bus supply and depending on the value of RGND, the device can work (or
not) in floating ground condition, as follows:
UM2605
Common features and parameters
UM2605 - Rev 1 page 3/27

1. Vcc <14.8 V
The Zener diode chain is OFF and the RGND is used to protect the system against a potential internal failure of
the device. Since the typical current consumption of the ICL device is ~ 1.5 mA (the current contribution of the
Zener diode chain is null in this case), in order to have a certain VGND, the RGND value is:
RGND =VGND
1.5mA (4)
1. Vcc > 14.8 V
In this case the Zener diode chain is enabled and the RGND is also used to limite the maximum current
consumption of the device, flowing through RGND resistor from GND pin to the system ground MGND.
This current consumption is given by the sum of two contributors:
1. The net current consumption of the RHRPMICL1A (considering the internal Zener diode chain current as
zero)
2. The current consumption of the Zener diode chain in ON-state
For example, if we want to set the maximum current consumption of the RHRPMICL1A device to 2 mA, the value
of RGND is:
RGND =VCC −14.8V
2mA (5)
The RHRPMICL1A can be configured to work also with power Buses with voltage higher than 52 V, by adding the
proper protection components to the application.
Guidelines on this feature are provided in the RHRPMICL1A datasheet.
2.5 Analog telemetry
The analog telemetry circuit gives information about the current flowing across the load. This circuit provides on
the TM pin a source current whose value is instantly proportional to the current flowing from the bus supply line to
the load. The voltage drop (VTM) on the external resistor RTM connected between the TM pin and MGND, is
proportional to the load current (ISENSE) flowing through RSENSE, thus performing a current/voltage conversion:
RTM =VTM
IRTM =VTM
ISENSE *RTMS
RSENSE (6)
2.6 Digital telemetry (status telemetry)
The status telemetry circuit gives some information about the device status, which can be retrieved by monitoring
the STS output pin, according to the following table.
Table 3. Signal on digital telemetry pin
STS pin signal RHRPMICL1A driver status
HIGH ON
LOW OFF
The STS is an open drain pin that can source a 100 μA fixed current; it is typically connected to MGND through
an external resistor RSTS, setting the desired high logic level value VH_STS as follows:
The following picture shows the telemetry signals during the ICL operation.
UM2605
Analog telemetry
UM2605 - Rev 1 page 4/27

Figure 4. Telemetry signals
UM2605
Digital telemetry (status telemetry)
UM2605 - Rev 1 page 5/27

3Features: EVAL-RHRICL1ATV1, re-triggerable mode
3.1 Getting started
The EVAL-RHRICL1ATV1 evaluation board is customized to allow the test of re-triggerable operative mode of the
RHRPMICL1A integrated current limiter (ICL).
In the re-triggerable mode, the ICL restarts automatically, recovering its normal operating mode if the current
limitation cause is removed; besides, during any overload or output short-condition events, after the TOFF
recovery time elapses, the device tries to re-start for a dedicated TON slot time (trip-off time).
The configuration pins of the ICL in this mode are:
• Telecommand interface: disabled (TC_ON and TC_OFF both connected to VCC)
• SET_STS is connected to VCC
• SET_FLB is connected to GND
• TON is connected to CON
• TON is connected to COFF
The external components of the board are pre-set to accomplish the following features:
• VCC = 50 V with VTH_ON = 44 V and VTH_OFF = 40 V
• HYS = 4 V
• ILIM = 5 A
• TON ˜ 3 ms (typ 2.7 ms) with TOFF ˜ 1s (typ. 0.94 s)
The evaluation board schematic is shown below. Please note that the capacitor Csns_2, connected in parallel to
the RSENSE, affects the dynamic of the reaction time and therefore the decision whether to mount it or not is up to
the application needs of the end user.
Figure 5. Re-triggerable evaluation board (schematic)
CVcc_2_btm
4.7 uF
SCH2
STPS3150
Csts_2
4.7 pF
Ctm_2 4.7 pF
Csns_2 1uF
Rcomp_2
1k
C6
4.7uF
C8
4.7uF
ZD2
1SMB5929BT3G
U2
1
2
3
4
5
6
7
8
9
10 11
17
18
19
20
16
15
14
13
12
VD_2
VCC+_2
P-ch2
STRH40P10
0
C5
4.7uF
Rhys_2
1.5k
Ruvlo_2
13k
Rv_2
220k
Rsns1_2
40m
VCC+_2
1
2
1
2
C7
4.7uF
0
Rsns2_2
40m
Rir_2
100k
RGND_2
16.2k
Con_2
27nF
I_STM- _1
I_STM+_1
Rtms+_2 5k
Rtms-_2 5k
ISNS -_1
ISNS+_1
VCC+_2
VCC-_2
VCC-_2
Ccomp_2
2.2 nF
COMP_2
VD_2
CVcc_2
100nF
RETRIGGERABLE MODE
VCC+_2
SET_FLB
SET_STS
I_REF
T_ON
T_OFF
STS
ICL_GND
Rsts_2
50k
Rtm_2 100k
TM
0
HYS
UVLO
UVLO
HYS
VCC
Rg_2
4R7
Coff_2
470nF
TC_OFF
TC_ON
CN3 CN4
VG
CFLAT20
UM2605
Features: EVAL-RHRICL1ATV1, re-triggerable mode
UM2605 - Rev 1 page 6/27

3.2 Operations
3.2.1 Power-on and testing environment
Connect a 50 V power supply to CN3, the load on CN4. The telecommand section is not activated in this
evaluation board. The analog and digital telemetries are accessible on the RTM and RSTS resistors respectively.
Figure 6. Testing environment
3.2.2 Trip-on and trip-off time programming
In re-triggerable mode, if the duration of the overcurrent is greater than the trip-off time TON, the external
MOSFET is switched OFF after the TON time has elapsed and stays OFF for the recovery time TOFF. When the
TOFF time elapses, the device restarts autonomously to its normal condition, turning on again the MOSFET, if the
current limitation cause is removed. Otherwise it switches cyclically on and off again while the overload persists
(hic-up mode).
The trip-off time TON is set by the CON capacitor connected between the pins TON and GND, and it is calculated
by the following equation:
TON =RIR*CON (7)
In the same way, the recovery time TOFF is set through the external capacitor COFF connected between the pins
TOFF and GND. The COFF capacitor is charged with a constant current whose value is a fraction (typ. 1/20) of IREF
current (externally set by the resistor RIR connected between the I_REF pin and GND). The charging phase of
COFF capacitor starts as soon as the TON time has elapsed, therefore the TOFF time is equal to the COFF charging
time defined by:
TOFF = 20*RIR*COFF (8)
In the equations above, unit for TON and TOFF are in seconds, for resistance in Ω and for capacitance in Farads.
The typical behavior of the device configured in re-triggerable mode is depicted below (timing is not in scale).
UM2605
Operations
UM2605 - Rev 1 page 7/27

Figure 7. Overload shorter than TON+TOFF Figure 8. Overload longer than TON+TOFF
Figure 9. Continuous short-circuit
UM2605
Operations
UM2605 - Rev 1 page 8/27

3.3.1 Layout of the EVAL-RHRICL1ATV1 board
Figure 10. EVAL-RHRICL1ATV1 top layout Figure 11. EVAL-RHRICL1ATV1 bottom layout
UM2605
Operations
UM2605 - Rev 1 page 9/27

3.3.2 Bill of material of the EVAL-RHRICL1ATV1 board
Table 4. Bill of material
Item Qty Reference Part / value Voltage
current Package Manufacturer Manufacturer
code More info Footprint
1 2 CN3, CN4 2PIN screw
connector Pitch-6.35 mm TH Phoenix
contact 1714955
INPUT
(CN1) and
OUTPUT
(CN2)
connectors
2 4 C5,C6,C7,C8 4.7 μF
capacitor 100 V 1812 TDK C4532X7S2A475
MX7S 1812
3 1 CVcc_2_btm 4.7 μF
capacitor 100 V 1812 TDK C4532X7S2A475
MX7S 1812
4 1 CVcc_2 100 nF 100 V 1206 MULTICOMP MCCA000490 X7R 1206
5 1 Csns_2 1 μF 10 V 0805 KEMET C0805C105K8N
ACTU X8L 0805
6 1 Coff_2 470 nF 50 V 0805 KEMET C0805C474K5R
AC X7R 0805
7 1 Ccomp_2 2.2 nF 50 V 0805 AVX 08055C222JAT2
AX7R 0805
8 2 C_TM_2
C_STS_2 47 pF 50 V 0805 KEMET C0805C470J5G
ACTU NPO 0805
9 1 Con_2 27 nF 50 V 1812 KEMET C1812C273J5G
ACTU NPO 1812
10 1 Rv_2 220 kΩ 100 V, 0.1%,
25 ppm/°C 0.125 W Panasonic ERA6AEB224V 0805
11 2 Rtms+_2,
Rtms-_2 5 kΩ 100 V, 0.1%, 5
ppm/°C 0.200 W Vishay thin film PNM0805E5001
BST5 0805
12 1 Rtm_2 100 kΩ 100 V, 0.1%,
25 ppm/°C 0.125 W Panasonic ERA6AEB104V I=20 μA 0805
13 1 Rsts_2 50 kΩ 100 V, 0.1%,
25 ppm/°C 0.200 W Vishay PNM0805E5002
BST5 I=100 μA 0805
14 1 RGND_2
(R_floating) 16.2 kΩ 1% 0.6 W Vishay MBB02070C162
2FCT00 TH
15 1 Rg_2 4.7 Ω 200 V, 1% 1 W Panasonic ERJB1BF4R7U 1020
16 2 Rsns1_2
Rsns2_2 40 mΩ 1%, 75 ppm/°C 1 W VISHAY WSL2512R0400
FEA
I=0.5 A - 10
A2512
17 1 Rhys_2 1.5 kΩ 100 V, 0.1%,
25 ppm/°C 0.125 W Panasonic ERA6AEB152V 0805
18 1 Ruvlo_2 13 kΩ 100 V, 0.1%,
25 ppm/°C 0.125 W Panasonic ERA6AEB133V 0805
19 1 Rcomp_2 1 kΩ 0.1%, 25
ppm/°C 125 mW Panasonic ERA6AEB102V 0805
20 1 Rir_2 100 kΩ 150 V, 0.1%,
25 ppm/°C 0.250 W Panasonic ERA8AEB104V I=10 μA 1206
21 1 ZD2 ZENER 15 V, 3 W
ON
SEMICONDUC
TORS
1SMB5929BT3G Zener SMB-
CASE403A
UM2605
Operations
UM2605 - Rev 1 page 10/27

Item Qty Reference Part / value Voltage
current Package Manufacturer Manufacturer
code More info Footprint
22 1 SCH2 STPS3150 3 A, 150 V ST STPS3150U Diode 100
V-5 A SMB
23 1 P_ch2
SOCKET
P-ch
TO254AA
socket
(for the
STRH40P10)
34 A, 100 V 3M TOUCH
SYSTEMS
203-2737-55-110
2
P-channel,
BVdss 100 V,
id 48 A,
RDS(on) 60
mΩ, Qg 162
nC
TO-254 AA
24 1 U2 ICL001 FLAT20 ST FLAT20
UM2605
Operations
UM2605 - Rev 1 page 11/27

4Features: EVAL-RHRICL1ALV1, latched mode
4.1 Getting started
The EVAL-RHRICL1ALV1 evaluation board is customized to allow the test of latched operative mode of the
RHRPMICL1A integrated current limiter (ICL).
In the latched mode, if the duration of the overcurrent event is greater than the trip-off time TON, the device
remains in current limitation for the TON interval, then the external MOSFET is latched OFF until a reset is given
through either the telecommand interface or a UVLO activation/deactivation cycle. Depending on the SET_STS
pin logic status the device can be programmed to start up in latched-on or latched-off mode.
The configuration pins of the ICL in this mode of operation are the following:
• Telecommand interface: enabled
• SET_STS is connected to VCC (latched-on) or GND (latched-off) through the switch SW1
• SET_FLB is shorted to GND
• TON is connected to CON
• TOFF is connected to GND
The external components of the board are pre-set to accomplish the following features:
• VCC = 37 V with VTH_ON = 32 V and VTH_OFF = 30 V
• HYS = 2 V
• ILIM = 2 A
• TON ˜ 10 ms
• TC_ON and TC_OFF are available on TC3 connector
• SET_STS can be connected to VCC or GND through the switch SW1
The evaluation board schematic is shown below. Please note that the capacitor Csns_1, connected in parallel to
the RSENSE, affects the dynamic of the reaction time and therefore the decision whether to mount it or not is up to
the application needs of the end user.
Figure 12. Latched evaluation board schematic
U1
CFLAT20
1
2
3
4
5
6
7
8
9
10 11
17
18
19
20
16
15
14
13
12
VD_1
TC_ON
P-ch1
STRH40P10
0
C1
4.7uF
Rv_1
220k
Rsns_1
50m
VCC+_1
CN1
1
2
CN2
1
2
C3
4.7uF
0
CVcc_1_btm
4.7 uF
Rir_1
100k
RGND_1
8.25k
Con_1
100 nF
I_STM+_1
I_STM- _1
Rtms+_1 5k
Rtms-_1
5k
ISNS+_1
ISNS
-
_1
VCC-_1
VCC+_1
VCC-_1
Ccomp_1
2.2 nF
LATCHING MODE
COMP_1
VD_1
1
3
SW1
2
CVcc_1
100nF
VCC+_1
LATCHED ON
LATCHED OFF
SET_FLB
SET_STS
TC_OFF
I_REF
T_ON
T_OFF
STS
ICL_GND
Rsts_1
50k
TM
Rtm_1 100k
0
UVLO
VG
HYS
HYS
UVLO
VCC
Rg_1
4R7
Csts_1
4.7 pF
Rtc_on_1
50K
Rtc_off_1
50K
SCH1STPS3150
Rcomp_1
1k
Ctm_1 4.7 pF
C2
4.7uF
C4
4.7uF
Csns_1
1uF
Rhys_1
1.58k
Ruvlo_1
18.7k
N-CH1
STN1NF10
N-CH2
STN1NF10
Rg_on
1k
Rg_off
1kTC3
1
2
3
0
TC_ON TC_OFF
ZD1
1SMB5929BT3G
UM2605
Features: EVAL-RHRICL1ALV1, latched mode
UM2605 - Rev 1 page 12/27

4.2 Operations
4.2.1 Power on and testing environment
Connect a 37 V power supply to CN1, the load on CN2.
The telecommand section is available on the TC3 connector. Separated signals TC_ON and TC_OFF are applied
to drive properly the telecommand interface.
Connect a jumper on SW1 in the position 1-2 to set the latched-OFF configuration, or in the position 2-3 for
latched-ON one.
Analog and digital telemetries are accessible on the RTM and RSTS resistors respectively.
Figure 13. Testing environment
4.2.2 Trip-off time programming
In latched mode, if the duration of the overcurrent is greater than the trip-off time TON, the device remains in
current limitation for the TON interval, after the external MOSFET is switched OFF and stays OFF until the device
is reset through the telecommand interface or UVLO activation/deactivation cycling. The trip-off time TON is set by
the CON capacitor connected between the pins TON and GND, and it is calculated by the following formula:
TON =RIR*CON (9)
UM2605
Operations
UM2605 - Rev 1 page 13/27

4.2.3 Telecommand interface
The telecommand interface is available through the TC_ON and TC_OFF pins of the ICL device. On the EVAL-
RHRICL1ALV1 board the telecommand pins are driven by two additional MOSFET transistors (NCH_1 and
NCH_2). The gates of these transistors are available by TC3 connector.
The device is switched-ON by applying a positive pulse signal of the typical duration of 100 μs between terminal 3
and 2 of connector TC3 (Figure 12. Latched evaluation board schematic ); or in alternative way, the device is
switched-ON by applying a negative pulse signal of the typical duration of 100μs directly to the pin TC_ON.
The device is switched-OFF by applying a positive pulse signal of the typical duration of 100 μs between terminal
1 and 2 of connector TC3 (Figure 12. Latched evaluation board schematic ); or in alternative way, the device is
switched-OFF by applying a negative pulse signal of the typical duration of 100 μs directly to the pin TC_ON.
In order to have a more robust implementation, unwanted ON/OFF pulses having a short duration (< 10 μs) are
ignored giving out a sort of noise immunity of the telecommand system. In case of contemporaneous application
of ON and OFF commands, the OFF command has the priority; this means for example that, in case of a failure of
the telecommand interface resulting in a permanent ON state, it is possible to switch OFF the device by sending
an OFF command.
The typical behavior of the device configured in latched mode is depicted below (timing not in scale).
Figure 14. Latched-on at start-up diagram Figure 15. Latched-off at start-up diagram
4.3.1 Layout of the EVAL-RHRICL1ALV1 board
Figure 16. EVAL-RHRICL1ALV1 top layout Figure 17. EVAL-RHRICL1ALV1 bottom layout
UM2605
Operations
UM2605 - Rev 1 page 14/27

4.3.2 Bill of material of the EVAL-RHRICL1ALV1 board
Table 5. Bill of material of the EVAL-RHRICL1ALV1 board
Item Quantit
yReference Part/
value Voltage current Package Manufacturer Manufacturer
code More info Footprint
1 2 CN1, CN2 2 PIN screw
connector Pitch-6.35 mm TH Phoenix
contact 1714955
INPUT
(CN1) and
OUTPUT
(CN2)
connectors
2 4 C1,C2,C3,C
4
4.7 μF
capacitor 100 V 1812 TDK C4532X7S2A47
5M X7S 1812
3 1 CVcc_1_bt
m
4.7 μF
capacitor 100 V 1812 TDK C4532X7S2A47
5M X7S 1812
4 1 CVcc_1 100 nF 100 V 1206 MULTICOMP MCCA000490 X7R 1206
5 1 Csns_1 1 μF 10 V 0805 KEMET C0805C105K8N
ACTU X8L 0805
6 1 Ccomp_1 2.2 nF 50 V 0805 AVX 08055C222JAT2
AX7R 0805
7 2 C_TM_1
C_STS_1 47 pF 50 V 0805 KEMET C0805C470J5G
ACTU NPO 0805
8 1 Con_1 100 nF 50 V 1206 AVX 12065C104KAT
2A X7R 1206
9 1 Rv_1 220 kΩ 100 V, 0.1%, 25
ppm/°C Panasonic ERA6AEB224V 0.125 W 0805
10 2 Rtms+_1,
Rtms-_1 5 kΩ 100 V, 0.1%, 25
ppm/°C Vishay thin film PNM0805E5001
BST5 0.200 W 0805
11 1 Rtm_1 100 kΩ 100 V, 0.1%, 25
ppm/°C Panasonic ERA6AEB104V I=20 μA,
0.125 W 0805
12 1 Rsts_1 50 kΩ 100 V, 0.1%, 25
ppm/°C Vishay PNM0805E5002
BST5
I=100 μA,
0,200 W 0805
13 1 RGND_1
(R_floating) 8.25 kΩ 1% Vishay MBB02070C825
1FCT00
I=2 mA, 0.6
WTH
14 1 Rg_1 4.7 Ω 200 V, 1% Panasonic ERJB1BF4R7U 1 W 1020
15 1 Rsns_1 50 mΩ 1 W, 1% ± 75
ppm/°C Vishay DALE WSL2512R0500
FEA 1 W 2512
16 1 Rhys_1 1.58 kΩ 100 V, 0.1%, 25
ppm/°C Panasonic ERA6AEB1581
V0.125 W 0805
17 1 Ruvlo_1 18.7 kΩ 100 V, 0.1%, 25
ppm/°C Panasonic ERA6AEB1872
V0.125 W 0805
18 1 Rcomp_1 1 kΩ 0.1%, 25
ppm/°C Panasonic ERA6AEB102V 125 mW 0805
19 1 Rir_1 100 kΩ 150 V, 0.1%, 25
ppm/°C Panasonic ERA8AEB104V I=10 μA,
0.250 W 1206
20 1 SW1 3 way switch jumper 3vie
21 1 ZD1 ZENER 15 V, 3 W SMB
ON
SEMICONDUC
TORS
1SMB5929BT3
GZener SMBCASE
403A
22 1 SCH1 STPS3150 3 A, 150 V SMB ST STPS3150U Diode
100V-5 A SMB
UM2605
Operations
UM2605 - Rev 1 page 15/27

Item Quantit
yReference Part/
value Voltage current Package Manufacturer Manufacturer
code More info Footprint
23 1 P_ch1
SOCKET
P-ch
TO254AA
socket (for
STRH40P10
)
34 A, 100 V 3M TOUCH
SYSTEMS
203-2737-55-11
02
P-channel,
BVdss 100
V, Id 48 A,
RDS(on) 60
mΩ, Qg
162 nC
24 1 U1 ICL001 FLAT20 ST FLAT20
25 2 N-CH1, N-
CH2
STN1NF101
A, 100 V Vgsth = 3 V ST STN1NF10
N-ch o
NPN from
60 V - 100
V
SOT-223
26 2 Rg_on_1,
Rg_off_1 1 kΩ 150 V, 1% Vishay CRCW08051K0
0FKEA 125 mW 0805
27 2 Rtcon_1,
Rtcoff_1 50 kΩ 100 V, 0.1%, 25
ppm/°C 200 mW VISHAY thin
film
PNM0805E5002
BST5
To pull
down 0805
28 1 TC3 CONN 3 way screw
contact PHOENIX
contact 1935174
Telecomma
nd external
connector
TH
UM2605
Operations
UM2605 - Rev 1 page 16/27

5Features: EVAL-RHRICL1AFV1, foldback mode
5.1 Getting started
The EVAL-RHRICL1AFV1 evaluation board is customized to allow the test of foldback operative mode of the
RHRPMICL1A integrated current limiter (ICL).
In the foldback mode, when an overcurrent event is detected, the ICL device provides a current limitation profile
whose value goes to tracking with the output voltage, reaching a small and safe value IF (see Figure 20. Foldback
current limiter characteristic even if a short-circuit on the load side occurs and persists.
This allows maintaining a safe power dissipation without shutting down the device, in case of failure.
The pin configuration of the ICL in this operation mode is:
• Telecommand interface: disabled (TC_ON and TC_OFF both connected to VCC)
• SET_STS is connected to VCC (on at start-up)
• SET_FLB is connected to VCC (Foldback mode enabled)
• TON and TOFF are connected to GND
The external components of the board are pre-set to accomplish the following features:
• VCC = 22 V with VTH_ON = 18 V and VTH_OFF = 17 V
• HYS = 1 V
• ILIM = 2 A
• IF = 100 mA
The evaluation board schematic is shown below. Please note that the capacitor Csns_3, connected in parallel to
the RSENSE, affects the dynamic of the reaction time and therefore the decision whether to mount it or not is up to
the application needs of the end user.
UM2605
Features: EVAL-RHRICL1AFV1, foldback mode
UM2605 - Rev 1 page 17/27

Figure 18. Foldback evaluation board (schematic)
RS3+
470
RS3-
470
CVcc_3_btm
4.7 uF
C10
4.7uF
U3
CFLAT20
1
2
3
4
5
6
7
8
9
10 11
17
18
19
20
16
15
14
13
12
SCH3
STPS3150
VD_3
P-ch3
STRH40P10
0
C9
4.7uF
Rhys_3
2.61k
Rv_3
220k
Rsns_3
50m
VCC+_3
CN5
1
2
CN6
1
2
C11
4.7uF
0
VCC-_3
Rir_3
100k
RGND_3
1.2k
I_STM+_1
I_STM- _1
Rtms+_3 5k
ISNS
-
_1
ISNS+_1
VCC+_3
VCC-_3
Ccomp_3
COMP_1
CVcc_3
100nF
SET_FLB
SET_STS
T_OFF
ICL_GND
I_REF
T_ON
STS
Rsts_3
50k
TM
0
HYS
UVLO
VG
UVLO
HYS
VCC
Rg_3 4R7
FOLDBACK MODE
Rcomp_31k
Ctm_3 4.7 pF
TC_ON
TC_OFF
R_flb
107k
Ruvlo_3
35.7k
Rtm_3 100k
Rtms-_3 5k
Csts_3
4.7 pF
ZD3
1SMB5929BT3G
C12
4.7uF
VD_3
2.2 nF
Csns_3 1uF
5.1.1 Operation
5.1.1.1 Power on and testing environment
Connect a 22 V power supply to CN5, the load on CN6.
The telecommand section is not activated in this evaluation board. The analog and digital telemetries are
accessible on the RTM and RSTS resistors respectively.
UM2605
Getting started
UM2605 - Rev 1 page 18/27

Figure 19. Testing environment
5.1.1.2 Current limit and foldback current programming
The V-I characteristic of a foldback current limiter developed with the EVAL-RHRICL1FV1A evaluation board is
shown below (two curves are depicted, showing the foldback characteristics for two different values of IF):
Figure 20. Foldback current limiter characteristic
This behavior is obtained by adding two sensing resistors RS3+ and RS3- between the RSENSE terminals and
ISNS+ and ISNS- pins of the RHRPMICL1A device. In addition, the foldback resistor RFLB is connected between
the power MOSFET drain and ISNS- pin.
Thanks to this sensing network, the output current in foldback mode, referring to Figure 20. Foldback current
limiter characteristic, is given by:
I=VCC − VF− R +RFLB *IFLB − R +RSENSE *IRS
RSENSE (10)
UM2605
Getting started
UM2605 - Rev 1 page 19/27

where:
• VF is the output voltage of V/I characteristic of Figure 20. Foldback current limiter characteristic (0 V in case
of a short-circuit condition)
• “IRS“ is a design parameter referring to the input current of the current sense amplifier, having a typical value
of 500 μA
• R=RS3+=RS3-
• IFLB is the current flowing through the foldback resistor RFLB and whose value is given by:
IFLB =VCC − VF− R*I−0.1
RFLB (11)
Of course, in case of output short-circuit condition, VF = 0 V and I = IF, i.e. the small and safe value (see
Figure 20. Foldback current limiter characteristic) reached when a short-circuit on the load side occurs and
persists.
The Eq. (10) and Eq. (11) are intended as a theoretical support to estimate the foldback current I (or IF) and do
not take into account the variation due to external component accuracy and matching, as well as the standard
process variations. Trimming on the final application is necessary.
In order to obtain the best results, it is recommended to use well-matched high precision resistors (0.1%) for
RS3+ and RS3- and RFLB.
The typical behavior of the device configured in latched mode is depicted below (timing is not in scale).
Figure 21. Foldback mode diagram
UM2605
Getting started
UM2605 - Rev 1 page 20/27
This manual suits for next models
2
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