Cosel SFS152412C User manual

3 Function
SFS/SFCS-21
3.1 Overcurrent protection (OCP) and Low voltage protection (LVP)
SFS/SFCS-21
3.2 Overvoltage protection (OVP)
SFS/SFCS-21
3.3 Remote ON / OFF (RC pin)
SFS/SFCS-21
3.4 Alarm (ALM pin)
SFS/SFCS-22
3.5 Start in / out (PO pin)
SFS/SFCS-22
3.6 Sequence
SFS/SFCS-22
3.7 Isolation
SFS/SFCS-22
5 Cleaning
SFS/SFCS-23
1 Connection for Standard Use
SFS/SFCS-20
2Wiring Input / Output Pin
SFS/SFCS-20
2.1 Wiring input pin
SFS/SFCS-20
2.2 Wiring output pin
SFS/SFCS-21
4 Series and Parallel Operation
SFS/SFCS-23
4.1 Series operation
SFS/SFCS-23
4.2 Parallel operation
SFS/SFCS-23
7 Safety Considerations
SFS/SFCS-24
8 Temperature Measuring Point
SFS/SFCS-24
9 SMD type Package Information
SFS/SFCS-24
9.1 Delivery package information (SFS series SMD type)
SFS/SFCS-24
9.2 Delivery package information (SFCS series SMD type)
SFS/SFCS-25
6 Storage method
SFS/SFCS-23
DC-DC Converters PCB Mount Type
Instruction Manual
SFS/SFCS-19
June 26, 2020

¡In order to use the power supply, it is necessary to wire as shown
in Fig.1.1.
¡When remote ON / OFF function is not used, please open RC pin
or short between RC and -Vin pin.
¡When alarm function is not used, please open ALM pin.
¡In parallel and series operation, connect each PO pin mutually.
When PO function is not used, please open PO pin.
¡The SFS / SFCS series handles only the DC input.
Avoid applying AC input directly.
!! It will damage the power supply. !!
¡Operate with the convection or forced air cooling.
[ Reference : “Derating” ]
1 Connection for Standard Use
(2) External capacitor on the input side
¡When the distance from the DC line to the unit is greatly extended,
it makes the input feedback noise much higher and the input volt-
age several times higher than the normal level when turned ON. If
this happens, the output power also becomes unstable. In order to
prevent the unit form failing in this way; please connect Ci to the
input pin. In addition, when the lter with “L” is used, please Ci to
the input pin.
(a)
(b)
Ta=-20 to +85CElectrolytic or Ceramic capacitor
Ta=-40 to +85CCeramic capacitor
Note:
When input line inductance becomes excessively high due to inser-
tion of choke coil, operation of the unit could become unstable. In
this case, increase Ci value more than the value indicated above.
(3) Conducted noise
¡Install an external input lter as shown in Fig.2.2 in order to re-
duce conducted noise.
The result for this solution is shown in Fig.2.3.
C1 : 1 F(ceramic capacitor)
L1 : 1 H
2 Wiring Input/Output Pin
2.1 Wiring input pin
(1) External fuse
¡The SFS / SFCS series is not internally fused. To ensure safe op-
eration and to receive each Safety Standards approvals, please
install an external fuse (fast-blow type).
¡When the input voltage from a front end unit is supplied to multiple
units, install a fast-blow type fuse in each unit.
¡Fuse must be connected to the +Vin side if to -Vin side is used as
ground, or fuse must be connected to -Vin side if +Vin side is used
as a ground.
DC-DC Converters PCB Mount Type Instruction Manual
Fig.1.1 Connection for standard use
Model SFS1524 / SFCS1524 SFS3024 / SFCS3024
Rated current 2A 4A
Model
SFS1048/SFS1548/SFCS1548 SFS2048/SFS3048/SFCS3048
Rated current 1A 2A
Table 2.1 Recommended fuse (fast-blow type)
Fig.2.1 Connection method of capacitor at input pin
Model SFS1524 / SFCS1524 SFS3024/SFCS3024
Ci 33 F 68 F
Model
SFS1048/SFS1548/SFS2048/SFCS1548 SFS3048/SFCS3048
Ci 10 F 22 F
Fig.2.2 Recommended external input lter
Table 2.2 Recommended capacitance Ci
+Vin
RC
PO
ALM
-Vin
DC
Input
+Vout
-Vout
Load
SW
Fuse
+Vin
-Vin
DC
Input
L
The unit is powered from
high impedance source
Ci
Long input line
+Vin
-Vin
Ci
DC
Input
C1
+Vin
-Vin
L1
Fuse
DC
Input
SFS/SFCS-20 June 26, 2020

(4) Reverse input voltage protection
¡Avoid the reverse polarity input voltage. It will damage the unit.
It is possible to protect the unit from the reverse input voltage by
installing an external diode as shown in Fig.2.4.
2.2 Wiring output pin
¡When the SFS / SFCS series supplies the pulse current for the
pulse load, please install capacitor Co between +Vout and -Vout
pins.
Recommended capacitance (Co)
1.2 - 5Vout : 22 - 4700 F
10 - 15Vout : 22 - 2200 F
¡Output ripple and start-up waveform may be inuenced by ESR-
ESL of capacitor and the wiring impedance.
¡Ripple and ripple noise are measured, as shown in the Fig.2.6, by
connecting Co and JEITA attachment.
3 Function
3.1 Overcurrent protection (OCP) and Low
voltage protection (LVP)
¡OCP and LVP circuits is built-in. LVP will trigger after 200ms typ
delay when OCP activates and output voltage drops down 90%
max (SFS20 : 95% max) of the rated output voltage.
¡When LVP is activated, ALM signal will becomes low impedance.
¡Recovery from the protection is accomplished by applying 5VDC
or less input for at least 1 second, or toggling remote ON / OFF
signal for at least 1 second.
3.2 Overvoltage protection (OVP)
¡The overvoltage protection circuit is built-in and comes into effect
at 120% to 140% (SFS20 : 115% to 145%) of the rated output volt-
age. When the load factor is less than 50%, output voltage may
be increased more than maximum voltage by the failure mode.
¡Normal or abnormal operation of the unit can be monitored by us-
ing the ALM pin. When OVP is activated, ALM signal will become
low level.
¡The DC input should be shut down if overvoltage protection is in
operation.
¡Please note that devices inside the power supply might fail when
voltage more than rated output voltage is applied to output pin of
the power supply. This could happen when the customer tests the
overvoltage performance of the unit.
3.3 Remote ON / OFF (RC pin)
¡Remote ON / OFF circuits is built-in on input side.
¡When remote ON / OFF function is not use, please open-circuit
between RC and +Vin or short-circuit between RC and -Vin.
¡Recovery from the protection is accomplished by applying 5VDC
or less input for at least 1 second, or toggling remote ON / OFF
signal for at least 1 second.
DC-DC Converters PCB Mount Type Instruction Manual
Fig.2.3 Example of conducted noise (SFS30483R3)
Fig.2.4 Reverse input voltage protection
Fig.2.5 Connection for pulse load
Frequency [Hz]
200k 300k 500k150k 1M 2M 3M 5M 10M20M30M
100
30
40
50
60
70
80
90
Level [dB V]
CISPR22-A (Ave.)
CISPR22-A (QP)
+Vin
-Vin
DC
Input
+Vout
Co
-Vout
Pulse
load
DC
Input
+Vin
-Vin
Fuse
+Vout
-Vout
SFS30483R3
1H
1F
Vin=48V Io=9A
Temp=25
C
Load
Fig.2.6 Measuring method of ripple and ripple noise
+Vout
-Vout
Load
25mm
DC
Input
+Vin
-Vin
Co
Oscilloscope R
C
Bw:100MHz
1. 5m 50 W
Coaxial Cable
JEITA attachment
R =50
W
C =4700pF or 10000pF
1.2 - 5Vout : Co=22 F
10 - 15Vout : Co=0.1 F
SFS/SFCS-21
June 26, 2020

(1) RC connection example 1
¡Remote ON / OFF connection and specication refer to below.
Fig.3.1 RC connection example 1
Table 3.1 Specication of example 1 (connection method Fig.3.1 (a), (b))
Between RC and +Vin (VRC1) Output voltage
Open ON
0V[VRC1[1.2V or Short OFF
(2) RC connection example 2
Table 3.2 Specication of example 2 (connection method Fig.3.2 (a), (b))
¡By connecting ALM pin in parallel and series operation, when one
unit has shut down by overvoltage protection or low voltage pro-
tection, other units will be shut down.
¡When alarm function is not use, please open ALM pin.
¡Total number of units should be no more than 20 pieces.
3.5 Start in / out (PO pin)
¡By connecting PO pin, difference of start-up voltage and stop volt-
age can be prevented.
¡In parallel and series operation, please connect each PO pin mu-
tually.
¡Total number of units should be no more than 20 pieces.
3.6 Sequence
¡The sequence time chart of Vin, Vout, PO, ALM and RC pins is
shown in Fig.3.4.
3.4 Alarm (ALM pin)
¡Normal or abnormal operation of the unit can be monitored by us-
ing the ALM pin.
¡When OVP or LVP are activated, ALM pin becomes same level as
-Vin pin.
¡The sink current of ALM pin is 10mA max.
3.7 Isolation
¡For a receiving inspection, such as Hi-Pot test, gradually increase
(decrease) the voltage for a start (shut down).
Avoid using Hi-Pot tester with the timer because it may generate
voltage a few times higher than the applied voltage, at ON / OFF
of a timer.
DC-DC Converters PCB Mount Type Instruction Manual
Fig.3.2 RC connection example 2
Between RC and –Vin (VRC2) Output voltage
10V or more (SFSO24 / SFCSO24)
20V or more (SFSO48 / SFCSO48)
or Open
OFF
0V[VRC2[1.2V or Short ON
Fig.3.3 ALM circuit
Fig.3.4 Sequence time chart
ALM
-Vin
8V(typ
)
1
0mA(max)
S
ink current
Recommended value of R1
Model SFSO24
SFCSO24
SFSO48
SFCSO48
R1 22kW220kW
Value of R2
Model SFSO24
SFCSO24
SFSO48
SFCSO48
R2 200kW360kW
+Vin
RC
-Vin
DC
Input
SW VRC1
+Vin
RC
-Vin
Photo coupler
DC
Input
VRC1
(a) (b)
SW
+Vin
RC
-Vin
DC
Input
R1
R2
VRC2
+Vin
RC
-Vin
R1
R2
VRC2
Transistor
(a) (b)
DC
Input
PO
A
LM
RC
20-200ms
LVP set remote ON
ALM set
start-up
detection
start-up
Vin
Vout
OCP set
200ms(typ)
OFF ON
ALM reset
SFS/SFCS-22 June 26, 2020

4.1 Series operation
¡In series operation, connect each PO and ALM pin mutually, wiring
as Fig.4.1.
4 Series and Parallel Operation
4.2 Parallel operation
¡In parallel operation, connect each PO and ALM pin mutually, wir-
ing as Fig.4.2.
¡To improve the load sharing of each unit, please use the same
length from each unit to the load.
¡Total number of units should be no more than 10 pieces.
5 Cleaning
¡When cleaning is necessary, follow the undermentioned condition.
Method: Immersion, ultrasonic wave and vapor
Cleaning agents: IPA (Solvent type)
Total time: 2 minutes or less
¡After cleaning, dry them enough.
¡To stock unpacked products in your inventory, it is recommended
to be kept under controlled condition, 5-30C, 60%RH and be
used within a year.
¡24-hours-baking is recommended at 125C, if unpacked products
was kept under uncontrol condition, in which 30C, 60%RH or
higher.
Original tray is not heat-resistant, please move them to heat-
resistant tray preparing to bake them.
To check moisture condition in the pack, silica gel packet has
some moisture condition indicator particle.
Indicated blue means good. Pink means alarm to bake it.
¡Notication. the tray will be deformed and the power supply might
be damaged, if the vacuum pressure is too much to reseal.
6 Storage method
DC-DC Converters PCB Mount Type Instruction Manual
(b) Connection 2
(a) Connection 1
Fig.4.1 Examples of series operation
+Vin
RC
PO
ALM
-Vin
+Vout
-Vout
SW
LED
Fuse
Fuse
DC
input
+Vin
RC
PO
ALM
-Vin
+Vout
-Vout
Load
+Vin
RC
PO
ALM
-Vin
+Vout
-Vout
SW
LED
Fuse
DC
input
+Vin
RC
PO
ALM
-Vin
+Vout
-Vout
Fuse
Load
Load
Fig.4.2 Example of parallel operation
+ Vin
RC
PO
ALM
- Vin
+ Vout
- Vout
SW
LED
Fuse
Fuse
DC
Input
+ Vin
RC
PO
ALM
- Vin
+ Vout
- Vout
Load
SFS/SFCS-23
June 26, 2020

7 Safety Considerations
¡To apply for safety standard approval using this power supply, the
following conditions must be met.
¿This unit must be used as a component of the end-use equipment.
¿The equipment does neither contain any basic nor double / rein-
forced insulation between input and output.
If the input voltage is greater than 60VDC, this has to be provided
by the end-use equipment according to the nal build in condition.
¿Safety approved fuse must be externally installed on input side.
8 Temperature
Measuring Point
9.1 Delivery package information (SFS series
SMD type)
¡These are packed in a tray (Fig.9.1, 9.2).
¡Capacity of the tray is 15 max.
In case of fractions, the units are stored in numerical order.
9 SMD type Package Information
DC-DC Converters PCB Mount Type Instruction Manual
¡In case of forced air, ventilation must keep the temperature of
point A and B below 120C. Refer to Fig.8.1 for the location of
point A and B.
Fig.8.1 Location of point A and B
Point B
Point A Fig.9.1 Delivery package information(SFS10/SFS15/SFS20)
Fig.9.2 Delivery package information(SFS30)
Dimension in mm
Material : Conductive PS
Dimension in mm
Material : Conductive PS
9.3
45 40X4=160
55X2=110
250
200
45
32
98
65
1211
7
4
10
151413
12
50.4X2=100.849.6
40.2X4=160.844.6
200
250
23
564
11 12
14 15
10
13
789
SFS/SFCS-24 June 26, 2020

9.2 Delivery package information (SFCS series
SMD type)
¡These are packed in a tray (Fig.9.4).
SFCS15 and SFCS30 can be used in the same pallet tray.
But the orientation of the power supplies is different.
¡Capacity of the tray is 10 max.
In case of fractions, the units are stored in numerical order.
¡Do not cut or deform the tray.
¡Tray is stacked with alternating opposite direction to prevent prod-
ucts from contacting against the bottom of trays.
Do not cut or deform the tray.
DC-DC Converters PCB Mount Type Instruction Manual
Fig.9.4 Delivery package information(SFCS15/SFCS30)
Dimension in mm
Material : Conductive PS
27
38
49
510
OUT IN
OUT IN
SFCS30XXXX
SFCS15XXXX
16.6
60.4X4=241.6
57.239.35
322.6
135.9
40.5
Fig.9.3 Stacking pattern of trays
SFS/SFCS-25
June 26, 2020