Analog Devices DC2575A Quick setup guide

1
Rev. A
DEMO MANUAL DC2575A
DESCRIPTION
LT8391AIFE
60V 2MHz Synchronous
1.5A Buck-Boost LED Driver
Demonstration circuit DC2575A is a 60V 2MHz synchro-
nous buck-boost LED driver featuring the LT8391A. It
accepts an input voltage from 4V to 60V and drives a
single string of LEDs up to 16V at 1.5A. DC2575A runs at
2MHz switching frequency and features spread spectrum
frequency modulation (SSFM) which can be enabled with
a simple jumper. SSFM spreads the switching frequency
from fSW to fSW+25% for reduced EMI. SSFM is not nec-
essary in applications where EMI is not important.
DC2575A uses AEC-Q automotive-approved components
such as power MOSFETs, diodes, input and output capaci-
tors and inductors.
The LT8391A has an adjustable switching frequency
between 600kHz and 2MHz. The jumper also allows exter-
nal frequency synchronization.
The LT8391A can be PWM dimmed with an external PWM
signal and an internally-generated PWM signal. DC2575A
has a jumper that can be set to switch between internally-
generated PWM signal, externally-generated PWM signal,
and no PWM signal (100% on). It can be analog dimmed
with a control voltage on either of its two control pins.
When run with both PWM dimming and spread spectrum,
the spread spectrum aligns itself with the PWM signal for
flicker-free operation.
The LT8391A features both open LED and short LED
(LED+to GND) protection as well as a fault output flag.
All registered trademarks and trademarks are the property of their respective owners.
Small ceramic input and output capacitors are used to
save space and cost. The board is designed with capaci-
tors on both sides of the synchronous switches for a
reduction in radiated EMI. The open LED overvoltage
protection uses the IC’s constant voltage regulation loop
to regulate the output to approximately 18V if the LED
string is opened. There is a protection diode from LED+
to GND to prevent negative ringing during a short-circuit
with long wires.
Undervoltage lockout can be adjusted on the circuit with
a few simple resistor choices.
EMI filters and gate resistors on the demo circuit reduce
this high power converter’s EMI below CISPR 25 Class 5
limits. This is intended for automotive applications where
CISPR 25 EMI standards are observed. In non-automotive
applications, where EMI may not be as important, the
input and output filters as well as the gate resistors can
be removed for higher efficiency. Please note the optional
EMI components in the parts list.
The LT8391A data sheet gives a complete description of
the part, operation and applications information. The data
sheet must be read in conjunction with this Demo Manual
for demonstration circuit DC2575A. The LT8391AIFE is
assembled in a 28-lead plastic TSSOP (FE) package with
a thermally-enhanced ground pad. Proper board layout
is essential for maximum thermal performance. See the
data sheet section "Layout Considerations".
Design files for this circuit board are available.

2
Rev. A
DEMO MANUAL DC2575A
QUICK START PROCEDURE
Demonstration circuit 2575A is easy to set up to evaluate
the performance of the LT8391A. Follow the procedure
below:
1. With power off, connect a string of LEDs that will run
with forward voltage less than or equal to 16V (at
1.5A) to the LED+and LED–banana jacks on the PCB
as shown in Figure 1.
2. Connect the EN/UVLO terminal to GND.
3. Set JP2 to EXT/ON and JP3 to ON for 100% always-
on LED operation. Set JP1 to NO SSFM/SYNC to run
without SSFM.
4. With power off, connect the input power supply to the
PVIN and GND banana jacks. Make sure that the DC
input voltage will not exceed 60V.
5. Turn the input power supply on and make sure the
voltage is between 4V and 60V for proper operation.
6. Release the EN/UVLO-to-GND connection.
7. Observe the LED string running at the programmed
LED current.
8. To change the brightness with analog dimming, sim-
ply attach a voltage source to either the CTRL1 or
CTRL2 terminal and set the voltage between 0V and
1.5V. See data sheet for details.
9. To change brightness with external PWM dimming,
set JP2 to EXT/ON and JP3 to EXT. Attach a 3V rect-
angular waveform with varying duty cycle to the PWM
terminal.
10. To change brightness with internally-generated PWM
dimming, set JP2 to INT and JP3 to INT. Adjust the
setting of the VR1 variable resistor with a small flat-
head screwdriver to toggle between 0% and 100%
PWM dimming duty cycle in 1/128 steps.
11. To enable spread spectrum frequency modulation, set
JP1 to SSFM ON.
Table 1. Typical Performance Summary for DC2575A (LT8391A)
PARAMETER CONDITIONS MIN TYP MAX
Input Voltage PVIN Range Operating VLED ≤16V 4V 60V
Switching Frequency (fSW) R3 = 59.0k, JP1 = NO SSFM/SYNC 2.0MHz
Spread Spectrum (SSFM) Frequency Range JP1 = SSFM ON fSW fSW • 1.25
ILED R2 = 0.056Ω 7.0V < PVIN < 60V VLED ≤16V
R9 = 90.9k, R10 = 113k
1.5A
VLED range R5 = 1M, R6 = 54.9k 4.8V 16V
Open LED Voltage VOUT R5 = 1M, R6 = 54.9k 18.2V
Typical Efficiency (100% PWM DC) PVIN = 13V, VLED = 16V, ILED = 1.5A 92%
Internally-Generated PWM Dimming Range JP2 = INT, JP3 = INT 1/128 100%
Internally-Generated PWM Dimming Frequency JP2 = INT, JP3 = INT R30 = 301k, R3 = 59.0k 488Hz
Peak Switch Current Limit Boost Region R1 = 0.006Ω 8.3A
Peak Switch Current Limit Buck Region R1 = 0.006Ω 8.3A
PVIN Undervoltage Lockout (UVLO) falling R7 = 383k, R8 = 165k 4.3V
PVIN Enable Turn-On (EN) Rising R7 = 383k, R8 = 165k 5.1V

3
Rev. A
DEMO MANUAL DC2575A
QUICK START PROCEDURE
Figure 1. Test Procedure Setup Drawing for DC2575A
+
–
+–
ILED VOUT
VIN
UP TO
16V MAX
1.5A
LED
STRING
+–
IIN
0V 2V
1V 2V
OPTIONAL
ANALOG
DIMMING
OPTIONAL
SYNC
OPTIONAL
CONNECT EN/UVLO
TO GND FOR
SHUTDOWN
INPUT
SUPPLY
EXTERNAL
OR
INTERNAL
PWM DIMMING
FAULT
FLAG
+
–
+
–
+
–
50
55
60
65
70
75
80
85
90
95
100
0 10 20 30 40 50
60
EFFICIENCY (%)
INPUT VOLTAGE (V)
DC2575 F02
16V 1.5A LEDs
Figure 2. DC2575A Efficiency Versus Input Voltage for 16V 1.5A LED Load

4
Rev. A
DEMO MANUAL DC2575A
QUICK START PROCEDURE
Figure 3. Infinite-Persist Scope Traces Show PWM Dimming and SSFM Working Together for Flicker-Free
Brightness Control with Both (a) Externally- and (b) Internally-Generated PWM Dimming (with EMI Filters)
WITH DC2575A EMI FILTERS
VPWM
VPWM
ILED 1A/DIV
ILED 1A/DIV
16V 1.5A LEDs
2000:1 100Hz PWM
EXTERNAL
128:1 500Hz PWM
INTERNAL
16V 1.5A LEDs
WITH DC2575A EMI FILTERS

5
Rev. A
DEMO MANUAL DC2575A
QUICK START PROCEDURE
Figure 4. Infinite-Persist Scope Traces Show PWM Dimming and SSFM Working Together for Flicker-Free Brightness
Control with Both (a) Externally- and (b) Internally-Generated PWM Dimming (with EMI Filters Removed)
WITHOUT DC2575A EMI FILTERS
VPWM
VPWM
ILED 1A/DIV
ILED 1A/DIV
16V 1.5A LEDs
2000:1 100Hz PWM
EXTERNAL
128:1 500Hz PWM
INTERNAL
16V 1.5A LEDs
WITHOUT DC2575A EMI FILTERS

6
Rev. A
DEMO MANUAL DC2575A
QUICK START PROCEDURE
Figure 5. DC2575A (LT8391A) Passes CISPR 25 Class 5 Radiated EMI
DC2575 F05a
0.1 1
0
10
20
30
40
50
60
10
PEAK RADIATED EMI (dBµV/m)
MHz
16V 1.5A LEDs
12VIN
2MHz
CISPR 25 CLASS 5
RADIATED EMI LIMITS
DC2575 F05b
–10
0
10
20
30
40
50
0 100 200 300 400 500 600 700 800 900
1000
PEAK RADIATED EMI (dBµV/m)
MHz
16V 1.5A LEDs
12VIN
2MHz
CISPR 25 CLASS 5
RADIATED EMI LIMITS
DC2575 F05c
0.1 1
0
10
–10
20
30
40
50
10
AVERAGE RADIATED EMI (dBµV/m)
MHz
16V 1.5A LEDs
12VIN
2MHz
CISPR 25 CLASS 5
RADIATED EMI LIMITS
DC2575 F05d
0
0
10
–10
20
30
40
50
1000900800700600500400300200100
AVERAGE RADIATED EMI (dBuV/m)
MHz
16V 1.5A LEDs
12VIN
2MHz
CISPR 25 CLASS 5
RADIATED EMI LIMITS

7
Rev. A
DEMO MANUAL DC2575A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 C1 CAP., 1µF, X7S, 100V, 10%, 0805 MURATA, GRJ21BC72A105KE11L
2 1 C2 CAP., 4.7µF, X5R, 10V, 10%, 0402 TDK, C1005X5R1A475K050BC
3 1 C3 CAP., 0.47µF, X5R, 16V, 10%, 0402 TAIYO YUDEN, EMK105ABJ474KV-F
4 1 C4 CAP., 3300pF, X7R, 16V, 10%, 0402 MURATA, GRM15XR71C332KA86D
5 1 C5 CAP., 0.022µF, X7R, 25V, 10%, 0402, AEC-Q200, NO SUBS.
ALLOWED
MURATA, GCM155R71E223KA55D
6 1 C6 CAP., 1µF, X7R, 25V, 10%, 0603 MURATA, GRM188R71E105KA12D
7 2 C7, C8 CAP., 0.1µF, X7R, 25V, 10%, 0402, AEC-Q200, NO SUBS.
ALLOWED
TDK, CGA2B3X7R1E104K050BB
8 1 C10 CAP., 22µF, ALUM., 63V, 20%, SMD 6.3mm ×7.7mm, D8, AEC-
Q200
PANASONIC, EEHZC1J220XP
9 2 C12, C32 CAP., 4.7µF, X7S, 100V, 10%, 1210, AEC-Q200, NO SUBS.
ALLOWED
MURATA, GCM32DC72A475KE02L
10 2 C14, C20 CAP., 10µF, X5R, 25V, 20%, 1210, AEC-Q200, NO SUBS. ALLOWED MURATA, GCM32ER71E106KA57L
11 2 D1, D2 DIODE, SCHOTTKY, 100V, 250mA, SOD323F, AEC-Q101 NEXPERIA, BAT46WJ,115
12 2 M1, M2 XSTR., MOSFET, N-CH, 60V, 22A, LFPAK33-8, AEC-Q101 NEXPERIA, BUK9M42-60E
13 2 M3, M4 XSTR., MOSFET, N-CH, 40V, 40A, PG-TSDSON-8, AEC-Q101 INFINEON, IPZ40N04S5L-7R4
14 1 L1 IND., 2.2µH, PWR, 20%, 9.2A, 14.5mΩ, 5.48mm ×5.28mm,
XAL5030, AEC-Q200
COILCRAFT, XAL5030-222MEC
15 1 Q1 XSTR., MOSFET, P-CH, 30V, 4.2A, SOT23-3 (TO-236AB), AEC-Q101 NEXPERIA, PMV50EPEA
16 1 R1 RES.,0.006Ω,1%,1.5W,1206, LONG-SIDE TERM.,KRL3216E,
SENSE, AEC-Q200
SUSUMU, KRL3216E-C-R006-F-T1
17 1 R2 RES.,0.056Ω, 1%, 1/2W, 1206, SHORT-SIDE TERM., RL1632,
SENSE
SUSUMU, RL1632R-R056-F
18 1 R3 RES., 59.0kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040259K0FKED
19 1 R4 RES.,4.7kΩ, 5%, 1/16W,0402 NIC, NRC04J472TRF
20 1 R5 RES.,1MΩ, 1%, 1/10W, 0603 PANASONIC, ERJ3EKF1004V
21 1 R6 RES., 54.9kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040254K9FKED
22 1 R7 RES., 383kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402383KFKED
23 1 R8 RES., 165kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402165KFKED
24 1 U1 IC,4-Switch Buck-Boost LED CTRLR,TSSOP-28FE ANALOG DEVICES, LT8391AIFE#PBF
Optional Low EMI Electrical Components
1 3 C34, C35, C36 CAP.,0.1uF,X5R,100V,10%,0402,NO SUBS. ALLOWED MURATA, GRM155R62A104KE14D
2 3 C37, C38, C44 CAP.,0.1uF,X7R,25V,10%,0402,AEC-Q200, NO SUBS. ALLOWED TDK, CGA2B3X7R1E104K050BB
3 2 C40, C41 CAP.,4.7uF,X7S,100V,10%,1210,AEC-Q200, NO SUBS. ALLOWED MURATA, GCM32DC72A475KE02L
4 2 D3, D4 DIODE,SCHOTTKY,20V,1A,SOD523-2 NEXPERIA, PMEG2010AEB,115
5 2 FB1, FB2 IND.,220 OHMS,BEAD,
FERRITE,25%,3A,40mOHMS,0805,AEC-Q200
TDK, MPZ2012S221ATD25
6 2 FB3, FB4 IND.,1k OHM,BEAD,
FERRITE,25%,1.5A,150mOHMS,0805,AEC-Q200
TDK, MPZ2012S102ATD25
7 2 R15, R17 RES.,10 OHMS,5%,1/16W,0402 VISHAY, CRCW040210R0JNED
8 2 R32, R33 RES.,5.1,OHMS,1%,1/16W,0402,AEC-Q200 VISHAY, CRCW04025R10FKED

8
Rev. A
DEMO MANUAL DC2575A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Other Optional Electrical Components
1 0 C18, C26, C27, C28,
C39 (OPT)
CAP., OPTION, 0402
2 0 C29, C30 (OPT) CAP., 0805, OPTION
3 0 C43 (OPT) CAP., OPTION, 0603
4 1 D5 DIODE, SCHOTTKY, 30V, 1A, SOD523-2, AEC-Q101 NEXPERIA, PMEG3010EB,115
5 0 D6, D7 (OPT) DIODE, OPTION, SOD-123
6 1 R9 RES., 90.9kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040290K9FKED
7 1 R10 RES., 113kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402113KFKED
8 1 R11 RES., 100kΩ, 1%, 1/16W, 0402 NIC, NRC04F1003TRF
9 0 R12, R18, R19, R20,
R21, R31 (OPT)
RES., OPTION, 0402
10 3 R13, R14, R16 RES., 0Ω, 1/16W, 0402 VISHAY, CRCW04020000Z0ED
11 0 R22, R23 (OPT) RES., OPTION, 0805
12 1 R27 RES., 100kΩ, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED
13 1 R29 RES., 91kΩ, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040291K0JNED
14 1 R30 RES., 301kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402301KFKED
15 1 VR1 RES., 100kΩ, 20%, 1/4W, SMD 4mm SQUARE,TRIMPOT, J-HOOK,
1-TURN
BOURNS, 3314J-1-104E
Hardware
1 2 J1, J2 CONN., BANANA JACK, FEMALE, THT, NON-INSULATED, SWAGE KEYSTONE, 575-4
2 2 JP1, JP3 CONN., HDR, MALE, 2×3, 2mm, THT, STR WURTH ELEKTRONIK, 62000621121
3 1 JP2 CONN., HDR, MALE, 1×3, 2mm, THT, STR WURTH ELEKTRONIK, 62000311121
4 3 XJP1, XJP2, XJP3 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421
5 4 E1, E2, E9, E10 TEST POINT, TURRET, 0.094", MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0
6 8 E3, E4, E5, E6, E7, E8,
E11, E12
TEST POINT, TURRET, 0.064", MTG. HOLE MILL-MAX, 2308-2-00-80-00-00-07-0
7 4 MH1, MH2, MH3, MH4 STANDOFF, NYLON, SNAP-ON, 0.375" WURTH ELEKTRONIK, 702933000

9
Rev. A
DEMO MANUAL DC2575A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications
subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
SCHEMATIC DIAGRAM
PVIN
4V - 60V
EN/UVLO
GND
ALL CAPACITORS ARE 0402.
NOTE: UNLESS OTHERWISE SPECIFIED
2MHz
ALL RESISTORS ARE 0402.
15V LED
LED+
FAULT
CTRL2
SYNC
GND
CTRL1
PWM LED-
1.5A
OUT
VREF
E4
C38
0.1uF
25V
C1 1uF 100V 0805
C14 10uF 1210 25V
C5
22nF
M3 IPZ40N04S5L-7R4
E2
R9 90.9K
R4 4.7K
C30 OPT 0805 R13
0
R30 301K
500Hz
R10 113K
R32
5.1
R19
OPT
R2
0.056
1206
C8 0.1uF
R18 OPT
Q1
PMV50EPEA
1
32
R3
59.0K
JP1
SSFM ON EXT SYNC NO SSFM/SYNC
SYNC/SSFM
1
5
3
2
4 6
U1
LT8391AIFE
EN/UVLO 9
FAULT
17
RP
10
CTRL1
13
PWM 11
ISP 14
SYNC/SPRD
22
SS
18
PWMTG
23
VC
20
RT
21
VREF
12
CTRL2
16
LSN 6
LSP 5
ISN 15
FB 19
TG2 25
SW2 26
BG2 28
BG1 1
SW1 3
TG1 4
BST1 2 BST2 27
VIN7
INTVCC
8
GND
29
VOUT 24
R22 OPT 0805
R21
OPT
C40 4.7uF
1210
100V
JP2
EXT/ON
INT
RP
1 3 2
C32 4.7uF
1210 100V
R15
10
E7
C36 0.1uF
0402
100V
C2 4.7uF
10V
D2
BAT46WJ
R11
100K
C39 OPT
R5
1M 0603
C29
OPT
0805
R14 0
C6 1uF
25V 0603
M1
BUK9M42-60E
FB1
MPZ2012S221ATD
E1
E6
C35 0.1uF
0402
100V
M2
BUK9M42-60E
C12 4.7uF
1210
100V
C44 0.1uF
25V
R1
0.006
KRL3216
J1
D6
OPT
C37
0.1uF
25V
E11
R31
OPT
R20 OPT
R12 OPT
D4
PMEG2010AEB
E3
C3
0.47uF
R16
0
VR1
100K
3314J-1-104E
13
2
D1
BAT46WJ
C27 OPT
FB4
R33
5.1
R27
100K
5%
FB2
MPZ2012S221ATD
C43 OPT
0603
R8
165K
D5
PMEG3010EB
C20 10uF 1210 25V
E9
E10
J2
C26 OPT
R17
10
E5
C41 4.7uF
1210 100V
JP3
ON
EXT
INT
PWM
1
5
3
2 4 6
L1
2.2uH
XAL5030-222MEB
E8
R23 OPT 0805
D7
OPT
C7
0.1uF
E12
C28 OPT
R6 54.9K
D3
PMEG2010AEB
C18 OPT
M4 IPZ40N04S5L-7R4
+
C10
22uF
63V
EEHZC1J220XP
C4 3.3nF
R29
91k 5%
C34 0.1uF
0402
100V
FB3
MPZ2012S102ATD25
R7 383K
ISP
ISN
INTVCC
INTVCC
VREF
PWMTG
PWMTG
VREF
INTVCC
INTVCC

10
Rev. A
DEMO MANUAL DC2575A
 ANALOG DEVICES, INC. 2017–2019
09/19
www.analog.com
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
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