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MAX25601 Evaluation Kit
General Description
The MAX25601 evaluation kit (EV kit) provides a proven
design to evaluate the MAX25601A automotive high-voltage, high-brightness LED (HB LED) boost-buck controller.
The front-end pre-boost operates from a 7.7V to 18V DC
supply voltage, generating a 48V output. The buck supports 12x LEDs and lower, delivering up to 1.5A to one
string of LEDs. The total voltage of the string can vary
from 3V to 36V.
Evaluates: MAX25601A
Quick Start
Required Equipment
● MAX25601 EV kit
● 12V, 5A DC power supply
● A series-connected LED string rated at least 1.5A
● Oscilloscope with a current probe
Procedure
Benefits and Features
● Configured for Pre-Boost and Buck Application
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation. Caution: Do not turn on
power supply until all connections are made.
● Analog Dimming Control
1)
Verify that all jumpers are in their default positions,
as shown in Table 1.
2)
Connect the positive terminal of the 12V supply to
the IN PCB pad and the negative terminal to the
nearest GND PCB pad.
3)
Connect the LED string across the LED+ and the
nearest GND PCB pad.
4)
Clip the current probe on the wire connected to the
LED string.
5)
Turn on the DC power supply.
6)
Verify that the LEDs turn on.
7)
Verify that the oscilloscope displays approximately
1A.
8)
Monitor desired signals on headers J6 and J7.
● Proven PCB Layout
● Fully Assembled and Tested
Ordering Information appears at end of data sheet.
319-100461; Rev 0; 10/19
MAX25601 Evaluation Kit
Evaluates: MAX25601A
Detailed Description of Hardware
The MAX25601 evaluation kit (EV kit) provides a proven
design to evaluate the MAX25601A automotive high-voltage, high-brightness LED (HB LED) boost-buck controller.
The front-end pre-boost operates from a 7.7V to 18V DC
supply voltage, generating a 48V output. The buck supports 12x LEDs and lower, delivering up to 1.5A to one
string of LEDs. The total voltage of the string can vary
from 3V to 36V.
The combination of the number of LEDs and buck switching frequency determine the required input voltage for the
buck, which is the output voltage of the boost. The boost
regulator supports a maximum of around 50W of output
power, or ~10A when operating down to 6V input.
Analog Dimming Control (REFI)
The EV kit demonstrates the analog dimming feature of
the buck controller. R1 and R2 form a resistor-divider
between VCC and AGND. R1 is a 24.9kΩ resistor and R2
is a 10kΩ potentiometer, with the wiper shorted to the high
side of the potentiometer. Install the shunt on J2(2-3) (see
Table 1 for jumper descriptions). Using a flat-blade screwdriver, turn the wiper-adjustment pin clockwise to increase
the voltage on the REFI input. Turn the wiper-adjustment
pin counterclockwise to decrease the voltage on the REFI
input. The REFI input allows for analog dimming of the
HB LED string. A REFI input voltage of ≤ 0.2V turns off
the LED driver, an input voltage between 0.2V and 1.2V
provides linear dimming of the HB LED string, and an
input voltage > 1.2V sets the HB LED string current to
maximum current (based on the current-sense resistor).
Alternatively, the analog dimming input can be set with a
power supply. Remove the shunt on J1 and connect an
external power supply directly to the REFI pin J7 pin 3
to perform analog dimming with a power supply. Do not
violate the absolute maximum voltage rating of VCC+0.3V
(refer to the Absolute Maximum Ratings section in the
MAX25601 IC data sheet).
Table 1. MAX25601 EV Kit Jumper Descriptions
JUMPER
SHUNT POSITION
1-2*
Connects DIM to a voltage-divider from VCC to ground.
When DIM is above 3V, the buck regulator is fully on at 100% dim duty cycle.
When DIM is between 0.2V and 3V, the buck regulator operates at a duty cycle
proportional to the DIM voltage, at a frequency of 200Hz.
When DIM is below 0.2V, the buck regulator is disabled.
2-3
Connects the DIM pin to ground to disable the buck regulator.
J1
Open
J2
DESCRIPTION
Disconnects DIM from the voltage divider. Allows DIM to be driven by an external
voltage source or PWM signal to drive the DIM pin.
1-2
Connects VCC to the REFI pin. LED current is at the maximum value of 1.5A in this
configuration.
2-3*
Connects REFI to a voltage-divider from VCC to ground. Adjusting R2 allows
programming the LED current from 0 to 1.5A.
Open
Disconnects the REFI pin of the device from the external voltage-divider on the VCC
pin. Allows REFI to be driven by an external voltage to set the LED current level.
J6
Open*
FLTB, RT/SYNCIN and PWM_HUD signals can be accessed.
J7
Open*
PWMDIM, IOUTV, REFI and HUD_OUT signals can be accessed.
J9
1-2
Open*
HUD dimming jumper
Disconnects HUD dimming
*Default position.
www.maximintegrated.com
Maxim Integrated │ 2
MAX25601 Evaluation Kit
Pulse-Dimming Input (DIM)
The EV kit demonstrates the PWM dimming feature of the
buck controller using either an external PWM signal, or a
DC voltage at the DIM pin.
Analog-to-PWM dimming:
1)
2)
Install a shunt across J1 (1-2).
Adjust the potentiometer R18 to set a DC voltage
between 0.2V and 3V on the DIM pin.
The resultant 200Hz PWM dimming duty cycle is proportional to the voltage at DIM.
Direct PWM dimming:
1)
Leave J1 open and connect a PWM signal to the
DIM pin on J7 pin 1.
2) Vary the duty cycle to increase or decrease the
intensity of the HB LED string.
The DIM input of the device has a 2V (max) rising threshold and a 0.8V (min) falling threshold and is compatible
with 3.3V and 5V logic-level signals.
Fault Indicator
The EV kit demonstrates the fault-protection features of
the buck controller, which offer shorted-LED, open-LED,
and overtemperature protection. The FLT output is an
open-drain, active-low fault indicator. Refer to the FLT
Flag section in the MAX25601 IC data sheet for more
information.
Current Monitor Output
The EV kit also demonstrates the current-monitor output feature of the buck controller. Refer to the Current
Monitor section in the MAX25601 IC data sheet for more
information.
Evaluates: MAX25601A
External VDRV input
The EV kit demonstrates operation of the buck controller
with an external VDRV input. In this case, the internal
LDO is not used. Remove R35 and apply an external
power supply between 4.6V and 5.5V on the VDRV PCB
pad to allow switching of the device.
HUD Applications
The EV kit can also be tested for HUD applications.
Remove capacitor C19 on the output. The output capacitor is now reduced to 0.1µF. Keep the DIM pin voltage
above 3V for 100% operation. The LEDs can be turned on
and off extremely fast by applying the PWM signal on the
PWM_HUD pin on J6 pin 3. REFI should have a fixed voltage. The DIM input of the device can be synchronized to
the leading edge of the PWM_HUD signal by AC coupling
DIM to PWM_HUD.
Additional Boost Regulator Configuration
The boost regulator slope compensation level, load line
and integrator operating mode are set by the resistor on
DL2 and SYNCOUT as detailed in Table 3 and Table 4
below.
Table 3. Boost Regulator Slope Selection
DL2 RESISTOR TO
PGND (R32)
DESCRIPTION
100kΩ
Larger slope comp for boost output
voltages above 45V
30kΩ
Smaller slope comp for boost
output voltages below 45V
Table 4. Boost Regulator Mode Selection
Table 2. PWM_HUD Control
PWM_HUD
HUD_OUT
DESCRIPTION
Low
High
External FET on.
HUD disabled (LED off).
High
Low
External FET off.
HUD enabled (LED on).
SYNCOUT RESISTOR
TO PGND (R31)
DESCRIPTION
35kΩ
Single-Phase or Dual-Phase
Master.
5kΩ
Dual-Phase Slave.
Ordering Information
PART
TYPE
MAX25601EVKIT#
EV Kit
www.maximintegrated.com
Maxim Integrated │ 3
MAX25601 Evaluation Kit
Evaluates: MAX25601A
MAX25601 EV Kit Bill of Materials
ITEM
REF_DES
1
C3, C7, C8,
C10, C18
DNI/DNP QTY
-
5
2
C4, C5, C11-C13,
C15
-
6
3
C6
-
1
MFG PART #
GCJ188R71H104KA12;
GCM188R71H104K;
CGA3E2X7R1H104K080AA
CGA6M3X7S2A475K200AE;
CGA6M3X7S2A475K200AB;
GCM32DC72A475KE02
C1608X5R1E475K080AC;
GRM188R61E475KE11
MANUFACTURER
VALUE
MURATA;MURATA;TDK
0.1UF
TDK;TDK;MURATA
4.7UF
TDK;MURATA
4.7UF
VENKEL LTD;KEMET
0.01UF
4
C9
-
1
C0603X7R500103JNP;
C0603C103J5RAC
5
C14, C27
-
2
CGA3E2X7R2A103K;
C0603C103K1RA;
GRM188R72A103KA01
TDK;KEMET;MURATA
0.01UF
6
C16
-
1
06035A471JAT2A
AVX
470PF
7
C19
-
1
8
C20
-
1
9
C22
-
1
10
C23, C66
-
2
EEE-TG2A220UP
PANASONIC
22UF
11
C25
-
1
C1608X5R1A106K080AC
TDK
10UF
12
C26
-
1
C0603C222K1RAC
KEMET
GRM31CR72A105KA01;
C3216X7R2A105K160AA;
GCH31CR72A105KE01;
HMK316B7105KLH
C0805C104K1RAC;
C2012X7R2A104K125AA;
GCM21BR72A104KA37;
GRM21BR72A104KAC4;
CGA4J2X7R2A104K125AA
C0603C223K5RAC;
GRM188R71H223K;
C1608X7R1H223K080AA;
GCJ188R71H223KA01
CGA3E3X7S2A104K080AB;
C1608X7S2A104K080AB
UMK107BJ105KA;
C1608X5R1H105K080AB;
CL10A105KB8NNN;
GRM188R61H105KAAL
DFLS1100-7
1N4148WS-7
BAT46WJ
MURATA;TDK;MURATA;
TAIYO YUDEN
1UF
CAPACITOR; SMT; 1206; CERAMIC; 1uF; 100V;
10%; X7R; -55 DEGC TO +125 DEGC
KEMET;TDK;MURATA;
MURATA;TDK
0.1UF
CAPACITOR; SMT (0805); CERAMIC CHIP; 0.1UF;
100V; TOL=10%; TG=-55 DEGC TO +125 DEGC;
TC=X7R
KEMET;MURATA;TDK;
MURATA
0.022UF
13
C30
-
1
14
C64
-
1
15
16
17
D1
D2, D4, D6-D8
D3, D5
-
1
5
2
18
FB, UVEN
-
2
19
GND1-GND4, HUD_DIM,
IN, LED+, VDRV,
VOUT_BOOST
-
9
9020 BUSS
WEICO WIRE
20
J1, J2
-
2
PCC03SAAN
SULLINS
21
J6
-
1
PBC03SAAN
SULLINS
22
J7
-
1
PBC04SAAN
SULLINS ELECTRONICS CORP.
TDK;TDK
TAIYO YUDEN;TDK;
SAMSUNG;MURATA
DIODES INCORPORATED
DIODES INCORPORATED
NXP
5000 KEYSTONE
23
J9
-
1
PCC02SAAN
SULLINS
24
L1
-
1
MSS1278-103ML
COILCRAFT
25
L3
-
1
MSS1278-104ML
COILCRAFT
26
MH1-MH4
-
4
27
28
Q1, Q2
Q3, Q5
-
2
2
SQJA60EP-T1_GE3
SQJ158EP-T1_GE3
VISHAY SILICONIX
VISHAY SILICONIX
29
Q4
-
1
SQSA80ENW-T1-GE3
VISHAY SILICONIX
VISHAY DALE;PANASONIC
BOURNS
9032 KEYSTONE
30
R1, R11
-
2
CRCW060324K9FK;
ERJ-3EKF2492
31
R2, R18
-
2
3296W-1-103LF
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DESCRIPTION
CAPACITOR; SMT (0603); CERAMIC CHIP;0.1UF;
50V;TOL=10%; TG=-55 DEGC TO +125 DEGC;
TC=X7R; AUTO
CAPACITOR; SMT (1210); CERAMIC CHIP; 4.7UF;
100V; TOL=10%; TG=-55 DEGC TO +125 DEGC;
TC=X7S; AUTO
CAPACITOR; SMT (0603); CERAMIC CHIP; 4.7UF;
25V; TOL=10%; TG=-55 DEGC TO +85 DEGC; TC=X5R
CAPACITOR; SMT (0603); CERAMIC CHIP; 0.01UF;
50V; TOL=5%; MODEL=X7R; TG=-55 DEGC TO +125
DEGC; TC=+/
CAPACITOR; SMT (0603); CERAMIC CHIP; 0.01UF;
100V; TOL=10%; MODEL=X7R; TG=-55 DEGC TO
+125 DEGC; TC= USE 20-00u01-M8
CAPACITOR; SMT (0603); CERAMIC CHIP; 470PF;
50V; TOL=5%; MODEL=C0G; TG=-55 DEGC TO
+125 DEGC; TC=+/
2200PF
0.1UF
1UF
DFLS1100-7
1N4148WS-7-F
BAT46WJ,115
N/A
MAXIMPAD
COMMENTS
CAPACITOR; SMT (0603); CERAMIC CHIP; 0.022UF;
50V; TOL=10%; TG=-55 DEGC TO +125 DEGC; TC=X7R
CAPACITOR; SMT (CASE_F); ALUMINUM-ELECTROLYTIC;
22UF; 100V; TOL=20%; MODEL=TG SERIES; TG=-40 DEGC
TO +125 DEGC
CAPACITOR; SMT (0603); CERAMIC CHIP; 10UF; 10V;
TOL=10%; MODEL=; TG=-55 DEGC TO +85 DEGC; TC=X5R
CAPACITOR; SMT (0603); CERAMIC CHIP; 2200PF; 100V;
TOL=10%; MODEL=X7R; TG=-55 DEGC TO +125 DEGC; TC=
CAPACITOR; SMT (0603); CERAMIC CHIP; 0.1UF; 100V;
TOL=10%; TG=-55 DEGC TO +125 DEGC; TC=X7S
CAPACITOR; SMT (0603); CERAMIC CHIP; 1UF;
50V; TOL=10%; MODEL=_MK SERIES; TG=-55 DEGC
TO +85 DEGC
DIODE; SCHOTTKY; SMT; PIV=100V; IF=1A
DIODE; SWT; SMT (SOD-323); PIV=75V; IF=0.3A
DIODE; SCH; SMT (SOD-323F); PIV=100V; IF=0.25A
TEST POINT; PIN DIA=0.1IN; TOTAL LENGTH=0.3IN;
BOARD HOLE=0.04IN; RED; PHOSPHOR BRONZE
WIRE SILVER PLATE FINISH;
EVK KIT PARTS; MAXIM PAD; WIRE; NATURAL; SOLID;
WEICO WIRE; SOFT DRAWN BUS TYPE-S; 20AWG
CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY;
STRAIGHT THROUGH; 3PINS; -65 DEGC TO +125 DEGC
CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY;
PBC03SAAN
STRAIGHT; 3PINS; -65 DEGC TO +125 DEGC
CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY;
PBC04SAAN
STRAIGHT; 4PINS; -65 DEGC TO +125 DEGC
CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY;
PCC02SAAN
STRAIGHT THROUGH; 2PINS; -65 DEGC TO +125 DEGC
INDUCTOR; SMT; FERRITE CORE; 10UH;TOL=+/-20%;
10UH
5.7A
INDUCTOR; SMT; FERRITE CORE; 100UH;TOL=+/-20%;
100UH
1.5A
MACHINE FABRICATED; ROUND-THRU HOLE SPACER;
9032
NO THREAD; M3.5; 5/8IN; NYLON
SQJA60EP-T1_GE3 TRAN; NCH; SO-8L; PD-(45W); I-(30A); V-(60V)
SQJ158EP-T1_GE3 TRAN; NCH; SO-8L; PD-(45W); I-(23A); V-(60V)
TRAN; AUTOMOTIVE N-CHANNEL 80V 175DEGC MOSFET;
SQSA80ENW-T1-GE3
NCH; POWERPAK1212-8; PD-(62.5W); I-(18A); V-(80V)
RESISTOR; 0603; 24.9K OHM; 1%; 100PPM; 0.10W;
24.9K
THICK FILM
RESISTOR; THROUGH-HOLE-RADIAL LEAD; 3296 SERIES;
10K OHM; 10%; 100PPM; 0.5W; SQUARE TRIMMING
10K
POTENTIOMETER; 25 TURNS; MOLDER CERAMIC
OVER METAL FILM
PCC03SAAN
Maxim Integrated │ 4
MAX25601 Evaluation Kit
Evaluates: MAX25601A
MAX25601 EV Kit Bill of Materials (continued)
ITEM
32
REF_DES
R3
33
R4
DNI/DNP QTY
MFG PART #
1 ERJ-3EKF6492
-
MANUFACTURER
PANASONIC
VALUE
64.9K
1
ERJ-3EKF1242
PANASONIC
12.4K
VISHAY DALE;YAGEO;
YAGEO;PANASONIC
100K
30K
34
R5, R17, R32
-
3
CRCW0603100KFK;
RC0603FR-07100KL;
RC0603FR-13100KL;
ERJ-3EKF1003;
AC0603FR-07100KL
35
R6
-
1
CRCW060330K0FK
VISHAY DALE
36
R7, R35
-
2
ERJ-P03F10R0V
PANASONIC
10
37
38
R8
R9
-
1
1
CSR1206-0R007F1
ERJ-8BSFR15
RIEDON INC.
PANASONIC
0.007
0.15
39
R10
-
1
CRCW0603422KFK
VISHAY DALE
422K
VISHAY DALE;PANASONIC
10K
VISHAY DALE;PANASONIC
4.99K
SAMSUNG ELECTRONICS;
BOURNS;YAGEO PH
0
CRCW060310K0FK;
ERJ-3EKF1002
CRCW06034K99FK;
ERJ-3EKF4991
RC1608J000CS;
CR0603-J/-000ELF;
RC0603JR-070RL
40
R12, R21
-
2
41
R13
-
1
42
R14, R15,
R27-R29, R40
-
6
43
R16, R22
-
2
ERJ-3RQF3R3V
PANASONIC
3.3
44
R19
-
1
CRCW0603470KFK
VISHAY DALE
470K
45
R23
-
1
CRCW06031M00JN
VISHAY DALE
1M
46
R24, R25
-
2
CRCW06030000Z0
VISHAY DALE
0
VISHAY DALE;PANASONIC
47
R26, R33, R34
-
3
CRCW0603100RFK;
ERJ-3EKF1000;
RC0603FR-07100RL
48
R31
-
1
ERJ-3EKF3482
PANASONIC
49
SU1, SU2, SU5
-
3
S1100-B;SX1100-B;
STC02SYAN
KYCON;KYCON;
SULLINS ELECTRONICS CORP.
50
TP1
-
1
7006 KEYSTONE
7006
51
TP2
-
1
7007 KEYSTONE
7007
52
U1
-
1
MAX25601AATJ+
MAXIM
MAX25601AATJ+
53
PCB
-
1
MAX25601
GRM1885C1H102JA01;
C1608C0G1H102J080AA;
GCM1885C1H102JA16
C0603X7R500103JNP;
C0603C103J5RAC
MAXIM
PCB
54
C1, C17
DNP
0
55
C2
DNP
0
56
C21, C24, C29
DNP
0
57
C28
DNP
58
C31
59
C32, C53,
C68, C69
60
R20
SX1100-B
1000PF
VENKEL LTD;KEMET
0.01UF
GRM1885C1H102FA01
MURATA
1000PF
0
GCJ188R71H104KA12;
GCM188R71H104K;
CGA3E2X7R1H104K080AA
MURATA;MURATA;TDK
0.1UF
DNP
0
C0603C101K1GAC
KEMET
100PF
DNP
0
C0603C332K1RAC
KEMET
3300PF
DNP
0
CRCW06031M00JN
VISHAY DALE
62
R36
DNP
0
63
R37-R39, R61
DNP
0
CRCW12062R00FK
R30, R79
34.8K
MURATA;TDK;MURATA
RC1608J000CS;
CR0603-J/-000ELF;
RC0603JR-070RL
CSR1206-0R007F1
61
100
DNP
TOTAL
www.maximintegrated.com
0
101
SAMSUNG ELECTRONICS;
BOURNS;YAGEO PH
1M
0
RIEDON INC.
0.007
VISHAY DALE
2
DESCRIPTION
RES; SMT (0603); 64.9K; 1%; +/-100PPM/DEGC; 0.1W
RESISTOR; 0603; 12.4K OHM; 1%; 100PPM;
0.10W; THICK FILM
COMMENTS
RESISTOR; 0603; 100K; 1%; 100PPM;
0.10W; THICK FILM
RESISTOR; 0603; 30K OHM; 1%; 100PPM;
0.10W; THICK FILM
RESISTOR; 0603; 10 OHM; 1%; 200PPM;
0.20W; THICK FILM
RES; SMT (1206); 0.007; 1%; +/-50PPM/DEGC; 1W
RES; SMT (1206); 0.15; 1%; +/-250PPM/DEGC; 0.5W
RESISTOR, 0603, 422K OHM, 1%, 100PPM, 0.10W,
THICK FILM
RESISTOR; 0603; 10K; 1%; 100PPM; 0.10W;
THICK FILM
RESISTOR; 0603; 4.99K; 1%; 100PPM; 0.10W;
THICK FILM
RESISTOR; 0603; 0 OHM; 5%; JUMPER; 0.10W;
THICK FILM
RESISTOR, 0603, 3.3 OHM, 1%, 100PPM,
0.10W, THICK FILM
RESISTOR, 0603, 470K OHM, 1%, 100PPM,
0.10W, THICK FILM
RESISTOR; 0603; 1M OHM; 5%; 200PPM;
0.10W; METAL FILM
RESISTOR; 0603; 0 OHM; 0%; JUMPER;
0.1W; THICK FILM
RESISTOR; 0603; 100 OHM; 1%; 100PPM;
0.10W; THICK FILM
RESISTOR; 0603; 34.8K OHM; 1%; 100PPM;
0.1W; THICK FILM
TEST POINT; JUMPER; STR; TOTAL LENGTH=0.24IN;
BLACK; INSULATION=PBT;PHOSPHOR BRONZE
CONTACT=GOLD PLATED
CONNECTOR; PANELMOUNT; BINDING POST;
STRAIGHT THROUGH; 1PIN; RED
CONNECTOR; PANELMOUNT; BINDING POST;
STRAIGHT THROUGH; 1PIN; BLACK
EVKIT PART - IC; MAX25601; SYNCHRONOUS
BOOST AND SYNCHRONOUS BUCK LED
CONTROLLER TQFN32-EP; PACKAGE CODE
T3255Y+6C; PACKAGE OUTLINE: 21-100041;
PACKAGE LAND PATTERN: 90-100066
PCB:MAX25601
-
CAPACITOR; SMT (0603); CERAMIC CHIP; 1000PF;
50V; TOL=5%; TG=-55 DEGC TO +125 DEGC
CAPACITOR; SMT (0603); CERAMIC CHIP; 0.01UF; 50V;
TOL=5%; MODEL=X7R; TG=-55 DEGC TO +125 DEGC; TC=+/
CAPACITOR; SMT (0603); CERAMIC CHIP; 1000PF; 50V;
TOL=1%; MODEL=GRM SERIES; TG=-55 DEGC TO
+125 DEGC; TC=C0G
CAPACITOR; SMT (0603); CERAMIC CHIP; 0.1UF; 50V;
TOL=10%; TG=-55 DEGC TO +125 DEGC; TC=X7R; AUTO
CAPACITOR; SMT (0603); CERAMIC CHIP; 100PF; 100V;
TOL=10%; MODEL=C0G; TG=-55 DEGC TO +125 DEGC; TC=+
CAPACITOR; SMT (0603); CERAMIC CHIP; 3300PF; 100V;
TOL=10%; MODEL=X7R; TG=-55 DEGC TO +125 DEGC; TC=
RESISTOR; 0603; 1M OHM; 5%; 200PPM; 0.10W;
METAL FILM
RESISTOR; 0603; 0 OHM; 5%; JUMPER;
0.10W; THICK FILM
RES; SMT (1206); 0.007; 1%; +/-50PPM/DEGC; 1W
RESISTOR, 1206, 2OHMS, 1%, 100PPM,
0.25W, THICK FILM
Maxim Integrated │ 5
10K
R18
GND
VDRV
BOURNS_3296W
VCC
GND
1
3
C23
100V
22UF
J1
OFF
2
4.99K
R13
PWMDIM
2
100
0.1UF
C3
12.4K
R4
R3
64.9K
R33
UVEN = 7.7V
FOR 64.9K AND 12.4K DIVIDER
7007
TP2
1
2
TP1
+
1
3
100V
0603
0.01UF
C14
10K
R2
R1
24.9K
50V
0.01UF
C9
30K
R6
BOURNS_3296W
VCC
1M
DNI
R20
0.01UF
2
DNI
C2
COMP
1
3
10V
10UF
C25
J2
RT/SYNCIN
SYNCOUT
100V
1210
R5 (RT) = 100KOHM
FSW (BOOST) = 340KHZ
UVEN
4.7UF
C4
2
REFI
10K
0603
R12
VDRV
50V
0603
0.1UF
50V
25V
C7
0603
0603
100
0.1UF
R34
C8
4.7UF
10
R35
C6
10
R5
100K
100V
0603
0.1UF
C30
R7
100V
1210
4.7UF
C5
INP
REFI
FLT
25
AGND
COMP
REFI
VCC
24
14
22
3
VDRV
FLTB
INN
INN
DNI
50V
0603
1000PF
C1
EP
0
R14
0
R79
DNI
DNI
PBC03SAAN
J6
PGND
TQFN 5X5
23
26
19
16
FB
HUD_OUT
PWM_HUD
TON
NC NC
15
9
OUT
12
CSN
IOUTV
10
DH2
8
6
7
5
BST2
LX2
30
DL1
DL2
27
LX1
CSP
29
BST1
DH1
BST1
U1
MAX25601AATJ+
DIM
17
PWMDIM
VDRV
RT/SYNCIN
RT/SYNCIN
20
UVEN
IN
100V
2200PF
C26
0.007
R8
SYNCOUT
11
1
R24
18
SYNCOUT
UVLO
IN
100V
0.01UF
C27
32
7006
1
3
0
21
0
2
IN
FB
DH2
LX1
C
C10
C31
0603
470PF
C16
TON
DNI
C21
PWM_HUD
FB
100K
R17
50V
0603
0.1UF
C18
DNI
100V
D4
D2
D5
3.3
A
A
Q1
0
R29
HUD_OUT
REFI
IOUTV
PWMDIM
10K
R21
470K
R19
2
1
2
3
DNI
R37
DNI
A
R27
DH2
DNI
3300PF
C32
DNI
2
R38
C
DFLS1100-7
D1
C53
0
C
0
A
R19 (RFB_TOP) = 470KOHM
R21 (RFB_BOT) = 10KOHM
VOUT (BOOST) = 48V
J7
PBC04SAAN
Q3
Q5
100K
R32
DL2
4
SQJ158EP-T1_GE3
C16 (CTON) = 470PF
R17 (RTON) = 100KOHM
FSW (BUCK) = 380KHZ
1
2
3
4
4
G S
D
D
G S
0.15
R9
R10
DNI
DNI
C24
R31
34.8K
SYNCOUT
HUD_OUT
OUT
D8
A
R11
24.9K
DNI
R30
DNI
C17
4
100V
1UF
C19
100V
1210
4.7UF
C15
35KOHM: INTEGRATOR, MASTER
5KOHM: INTEGRATOR, SLAVE
R23
1M
0
R15
1N4148WS-7-F
C
MSS1278-104ML
3300PF
C69
DNI
R61
2
DNI
2
R39
DNI
3300PF
422K
100V
100V
100V
L3
1210
1210
1210
100UH
4.7UF
4.7UF
4.7UF
C68
C13
C12
C11
VOUT_BOOST
SQJ158EP-T1_GE3
A
1N4148WS-7-F
D6
C
1N4148WS-7-F
D7
R40
SQJA60EP-T1_GE3
Q2
5
3300PF
R10 (ROUT_TOP) = 422KOHM
R11 (ROUT_BOT) = 24.9KOHM
OVP = 45V
IOUTV
3
100KOHM: VOUT>45V, MORE SLOPE
30KOHM: VOUT
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