Preliminary datasheet, Pin description – Diodes AP3612 User Manual

Page 3

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Preliminary Datasheet

Boost Type LED Driver with 12-Channel Current Source AP3612

Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

3

Pin Description

Pin Number

Pin Name

Function

HSOP-28 SOIC-24

28,1,2,3,4,5,

8,9,10,11,12 ,14

18,19,20,21, 22,23,

1, 2, 3, 4, 5, 7

CH1 to CH12

LED current sink. Leave the pin open directly
if not used

6, 21,25

NC

No connection

7, 20

24

GND

Ground pin

13

6

ISET

LED current setting pin. The corresponding
maximum current of all strings is set through
connecting a resistor from this pin to GND

15

8 OVP

Over voltage protection pin. When the OVP
pin voltage exceeds 2.0V, the OVP is triggered
and the power switch is turned off. When the
OVP pin voltage drops below hysteresis
voltage, the OVP is released and the power
switch will resume normal operation

16

9

RT

Frequency control pin

17 10 EN

ON/OFF control pin. Forcing this pin above
2.4V enables the IC while below 0.5V shuts
down the IC. When the IC is in shutdown
mode, all functions are disabled to decrease
the supply current below 3

µA

18 11 CS

Power switch current sense input

19 12

OUT

Boost converter power switch gate output.
This pin output high voltage (5V/V

IN

-0.5V) to

drive the external N-MOSFET

22 13

VCC

5V linear regulator output pin. This pin should
be bypassed to GND (recommend to connect
with GND pin) with a ceramic capacitor

23 14

VIN

Supply input pin. A capacitor (typical 10

µF)

should be connected between the VIN and
GND to keep the DC input voltage constant

24 15

STATUS

LED operation status output

26 16

COMP

Soft-start and control loop compensation

27 17

DIM

PWM dimming control pin. Adding a PWM
signal to this pin to control LED dimming. If
not used, connect it to the high level






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