ON Semiconductor CAT4201AGEVB User manual

©Semiconductor Components Industries, LLC, 2013
July, 2013 −Rev. 1
1Publication Order Number:
EVBUM2205/D
CAT4201AGEVB
CAT4201 LED Driver
Evaluation Board
User's Manual
Introduction
This document describes the CAT4201AGEVB
evaluation board for the CAT4201 high efficiency
step-down LED driver. Boards equipped with a 9 V battery
and separate LED module can be used for demonstrations
(see Figure 1).
The CAT4201 is a high efficiency step-down LED driver
from Catalyst Semiconductor. This device is designed to
drive high brightness LEDs up to 350 mA from a power
supply up to 28 V. The LED brightness is controlled by a
single resistor from the RSET pin to GND. Analog dimming
and idle mode control are available through the CTRL input.
An external circuit is provided on the CAT4201AGEVB for
PWM dimming.
Operation Procedure
The CAT4201AGEVB board has two modes of operation.
The first is normal operation and the second is operation
with PWM dimming. Normal operation is set by placing
jumper J1 in the right side position with pins 2 and 3 tied
together. In this mode, the CTRL pin is pulled up to the LED
cathode (LED−). The LED(s) will be at full brightness as
long as the CTRL pin is greater than 3 V. LED current can
be set from 70 mA to 350 mA by adjusting potentiometer
R2.
To set the board for PWM dimming, jumper J1 should be
placed in the left side position with pins 1 and 2 tied together.
A PWM signal can be applied to the PWM pin to dim the
LED brightness. The amplitude of the PWM signal should
be greater than 1 V.
Device Demonstration
To set up the CAT4201AGEVB for demonstrations, the
board should be configured for normal operation with a 9 V
battery securely placed in the holder. A separate LED
module should also be plugged into the 6-pin connector, as
shown in Figure 1. To turn on the LED, press and hold the
POWER button. The LED will turn off once the button is
released.
Figure 1. CAT4201AGEVB with LED Module
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SCHEMATIC
Figure 2. CAT4201AGEVB Schematic

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TEST PROCEDURE FOR THE CAT4201AGEVB EVALUATION BOARD
Introduction
This document describes the test procedure for the
CAT4201 evaluation board. The test procedure must be
followed step-by-step in order to verify that the evaluation
board is fully functional.
Test Set-up
The CAT4201 evaluation board must have the jumper J1
installed between pins 2 and 3 (right position).
The test set-up uses the LED module plugged into the
CAT4201 evaluation board.
The LED current is measured by removing the LED
module jumper J2 and connecting an ammeter (A) between
those two pins, see figure below.
Figure 3. CAT4201AGEVB Test Set-up
A
ILED = 300 mA
J1
Pot R2
V = 0.22 V
VS= 12 V
ISUPPLY = 100 mA
J2
V
PS
+
−
Legend:
ƒ (PS) = 12 V DC power supply, connected between GND and VBAT
ƒ (A) = Ammeter, connected to LED module across J2 connector (jumper removed)
ƒ (V) = Voltmeter, connected between R1/R2 midpoint and GND
Note: The LED of the LED module is very bright and should be covered for eye protection.
Test Procedure
The test procedure is achieved by following the sequence
below step-by-step.
1. Connect the voltmeter (V) between R1/R2
midpoint and GND.
2. Connect the power supply (PS) between VBAT (+)
and GND (−).
3. Turn the power supply on.
4. Measure the voltage on voltmeter (V).
5. Turn the potentiometer R2 and adjust until voltage
is 0.22 V.
6. Measure the LED current (A).
7. The LED current must be between:
270 mA ≤ILED ≤330 mA.
8. Measure the supply current on the power supply.
9. The supply current must be between:
90 mA ≤ISUPPLY ≤115 mA.
10. Turn off the power supply (PS).
11. Disconnect the CAT4201 evaluation board.

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Table 1. CAT4201AGEVB BILL OF MATERIALS
Name Qty. Description Manufacturer Part Number
U1 1 High Efficiency Step-down LED Driver, SOT−23−5 ON Semiconductor CAT4201
Q1 1 PNP Bipolar Transistor −45 V/−500 mA, SOT−23 ON Semiconductor BC807-25LT1G
Q2 1 NPN Bipolar Transistor 45 V/100 mA, SOT−23 ON Semiconductor BC847CLT1G
D 1 Schottky Diode 40 V/500 mA, Size SOD−323 Central Semi CMDSH05-4
C1 1 Ceramic Capacitor 4.7 mF/50 V, X7R, Size 1210 Murata GRM32ER71H475KA88L
C2 1 Ceramic Capacitor 10 mF/35 V, X5R, Size 1210 Taiyo Yuden GMK325BJ106KN-T
L 1 Inductor 33 mH, low DCR, 0.97 A Sumida CDRH6D28-330
R1 1 SMT Resistor 1/10 W, 8.2 kW, 0603 Yageo 9C06031A8201FKHFT
R2 1 Trim Pot. 47 kWVishay T63YB473K
R3, R5 2SMT Resistor 1/10 W, 1 kW, 0603 Yageo 9T06031A1001FBHFT
R4 1 SMT Resistor 1 W/500 mW Size 1210 Panasonic ERJ-P14J1R0U
R6 1 SMT Resistor 1/10 W, 47 kW, 0603 Yageo 9T06031A4702FBHFT
R7, R8 2SMT Resistor 1/10 W, 10 kW, 0603 Yageo 9T06031A1002FBHFT
J1 1 3 Pin Header Connector 0.1″Pitch Tyco 640452-3
J2 1 2 Pin Header Connector 0.1″Pitch Tyco 640452-2
K3 1 6 Pin Header Receptacle 0.1″Pitch Tyco 535676-5
1SPST Pushbutton Switch (Not Shown in Schematic) HDK KSM0631A
19 V Battery Holder (Optional) Keystone 1294

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