CAT4106AGEVB
CAT4106 LED Driver
Evaluation Board
User's Manual
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EVAL BOARD USER’S MANUAL
Introduction
Operation Procedure
This document describes the CAT4106AGEVB
evaluation board for the CAT4106 quad-channel DC/DC
boost LED driver. The major operating characteristics of the
CAT4106 can be measured with this board.
The CAT4106 DC/DC converter is capable of driving up
to 4 strings of LEDs with tight matching. This device is
designed to drive LED strings up to 36 V. The LED
brightness is set by a single resistor from the RSET pin to
GND and PWM dimming is available via the EN/PWM pin.
Additional information can be found in the CAT4106 data
sheet.
The CAT4106AGEVB board contains one CAT4106 in
a typical application circuit. The board can be powered in
two different ways. With the J1 jumper in place a single high
voltage supply (6 V to 24 V) can be applied between VL and
GND. A circuit on board will generate a lower, regulated
voltage for the VIN pin (6.2 V – VGS of transistor M1). VIN
can also be powered separately by removing the J1 jumper
and applying a second voltage to the VIN test point. The
voltage at VIN should not exceed 6.0 V.
VFMAX and VFMIN are set by potentiometers R4 and
R6 respectively. The VFMIN potentiometer is located
closest to the VIN test point. These can be used to set the
maximum and minimum allowable forward voltages for any
given LED string. For the CAT4106AGEVB, the settings for
these potentiometers are calculated as follows:
R4 + 69.8 kW
R6 + 60 kW
October, 2011 − Rev. 1
FMAX
ǒV1.2 V * 1Ǔ * 100 kW
FMIN
(eq. 1)
(eq. 2)
Any open LED conditions will trigger a fault condition.
Any short LED conditions will only trigger a fault condition
during power-up. A red LED will turn on when a fault
condition takes place.
The LED current is set by potentiometer R13 which is
labeled RSET on the CAT4106AGEVB. The anode end of
each LED string should be connected to VOUT and the
cathode ends can be connected at the available header
connectors J5 and J6. Placing jumpers on J5 and J6 headers
allows to short two or more LED channels together.
EN or PWM input signals can be connected at the
EN/PWM test point. The voltage at EN/PWM should not
exceed 6.0 V. The CAT4106 can support PWM frequencies
up to 2 kHz.
Figure 1. CAT4106AGEVB Board
© Semiconductor Components Industries, LLC, 2011
ǒV1.2 V * 1Ǔ * 100 kW
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Publication Order Number:
EVBUM2024/D
CAT4106AGEVB
D
L
VL
47 mH
R9
100 W
C2
4.7 mF
M1
VIN
1
J1
SW
R8
60 kW
GND
VOUT
U1
2
C3
10 mF
6
SW
EN/PWM
VIN
9
EN/PWM
7
C1
1 mF
EN/PWM
R14
100 kW
Z1
6.2 V
13
R2
R1
649 W
10
28 kW
5
VIN
EN/PWM
VFMIN
RSET
LED1
CTRL
LED2
FB
LED3
LED4
R13
20 kW
R3
28 kW
CAT4106
R10
FAULT
VFMAX
GND
FAULT
PGND
2
4
VIN
1 kW
R4
2.2 MW
R6
2.2 MW
SW
SW
R11
100 kW
R12
100 kW
R5
69.8 kW
R7
60 kW
12
11
1
LED1
16
LED2
15
LED3
14
LED4
3
FAULT
J5
LED1
1
1
LED2
2
2
LED3
3
3
LED4
4
4
J6
LED1
LED2
LED3
LED4
Figure 2. CAT4106AGEVB Board Schematic
Table 1. BILL OF MATERIALS
Name
Manufacturer
Description
U1
ON Semiconductor
4-Channel Boost LED Driver, 4 mm x 4 mm TQFN
CAT4106
Part Number
Units
1
C1
AVX
Ceramic Capacitor 1.0 mF/10 V, 10%, X5R, 0603
0603ZD105KAT2A
1
C2
AVX
Ceramic Capacitor 4.7 mF/25 V, 10%, X5R, 1206
12063D475KAT2A
1
C3
Taiyo Yuden
Ceramic Capacitor 10 mF/ 35 V, 10%, X5R, 1210
GMK325BJ106KN-T
1
R1
Yageo
SMT Resistor 0.1 W, 649 W, 0603
RC0603FR-07649RL
1
R2, R3
Yageo
SMT Resistor, 0.1 W, 28 kW, 0603
RC0603FR-0728KL
2
R4, R6
Vishay
Trimmer Potentiometer, 2.2 MW
T93YB225K
2
R5
Yageo
SMT Resistor, 0.1 W, 69.8 kW, 0603
RC0603FR-0769K8L
1
R7, R8
Yageo
SMT Resistor, 0.1 W, 60.4 kW, 0603
RC0603FR-0760K4L
2
R9
Yageo
SMT Resistor, 0.1 W, 100 W, 0603
RC0603FR-07100RL
1
R10
Tyco
SMT Resistor, 0.1 W, 1 kW, 0603
RC0603FR-071KL
1
R11, R12, R14
Yageo
SMT Resistor, 0.1 W, 100 kW, 0603
RC0603FR-07100KL
3
R13
Vishay
Trimmer Potentiometer, 20 kW
T73YE-20K-ND
1
L
Coiltronics
Inductor 47 mH, 1.08 A
DR73-470-R
1
D
NXP
Schottky Diode, 60 V/1 A
PMEG6010CEJ T/R
1
M1
ON Semiconductor
N-Channel MOSFET, 60 V/115 mA
2N7002L
1
Z1
ON Semiconductor
Zener Diode, 6.2 V
MM3Z6V2
1
J1, J2
Tyco
2 Pin Header Connector 0.1” Pitch
640452-2
2
Tyco
J5, J6
4 Pin Header Connector 0.1” Pitch
640452-4
2
Mil-Max
Pin Receptacle (Test Points)
#0149-0-15-01-30-14-04-0
(or equiv)
6
LiteOn
SMT Red LED
LTST-T970KRKT
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