ON Semiconductor CAT4201AGEVB User Manual

CAT4201AGEVB
CAT4201 LED Driver
Evaluation Board
User's Manual
Introduction
This document describes
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
© Semiconductor Components Industries, LLC, 2013
July, 2013 − Rev. 1
the CAT4201AGEVB
Figure 1. CAT4201AGEVB with LED Module
1
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EVAL BOARD USER'S MANUAL
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.
Publication Order Number:
EVBUM2205/D