MP3373, 8 STRINGS, WLED CONTROLLER WITH EXTERNAL TRANSISTOR

MP3373 Rev. 1.02

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9

8/16/2016

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PIN FUNCTIONS

Pin #

Name

Description

1

VIN

Power Supply Input. Drive VIN with 9V to 40V power source. Must be locally bypassed.

2

VCC

The Internal 10V Linear Regulator Output. VCC provides power supply for the internal

MOSFET switch gate driver and the internal control circuitry. Bypass VCC to GND with a

ceramic capacitor.

3

COMP

Step-up Converter Compensation Pin. This pin is used to compensate the regulation

control loop.

4

OSC

Switching Frequency Set. Connect a resistor between OSC and GND to set the step-up

converter switching frequency.

5

EN/PWM Enable Control and PWM Dimming Signal Input. Do not let this pin floating.

6

DIM

Dimming Input Pin. To use PWM dimming mode, apply an external PWM signal with

amplitude greater than 1.6V on this pin. To use analog dimming mode, apply a DC voltage

range from 0.4V to 1.5V on this pin linearly to set LED current from 0% to 100%.

7

FB1

LED Current Feedback Pin. Detect the channel 1 LED current.

8

CTL1

External Transistor Control Pin. Connect it to the base of external transistor to regulate the

channel 1 LED current.

9

FB2

LED Current Feedback Pin. Detect the channel 2 LED current.

10

CTL2

External Transistor Control Pin. Connect it to the base of external transistor to regulate the

channel 2 LED current.

11

FB3

LED Current Feedback Pin. Detect the channel 3 LED current.

12

CTL3

External Transistor Control Pin. Connect it to the base of external transistor to regulate the

channel 3 LED current.

13

FB4

LED Current Feedback Pin. Detect the channel 4 LED current.

14

CTL4

External Transistor Control Pin. Connect it to the base of external transistor to regulate the

channel 4 LED current.

15

CTL5

External Transistor Control Pin. Connect it to the base of external transistor to regulate the

channel 5 LED current.