AL3065A

Typical Applications Circuit

L

D

ON OFF

EN

RT

COMP

VCC

ADIM

GND

ISET

DIM

CH1

OVP

CS

OUT

VIN

CH4

22

µH

0.15

Ω

22

µF

22

µF

1M

Ω

51k

Ω

10k

Ω

10

µF

10k

Ω

10k

Ω

120k

Ω

2.2

µF

1k

Ω

0.22

µF

VCC / DC signal / NC

PWM input

CH2

CH3

Pin Descriptions

Pin Number

Pin Name

Function

SO-16

1

CH4

LED Current Sink 4. If not used—see1- to 3-Channel Recommended Connections.

2

ISET

LED Current Set Pin. The corresponding maximum current of all four strings is set through connecting a

resister from this pin to GND.

3

OVP

Overvoltage 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 resumes normal operation.

4

RT

Frequency Control Pin.

5

EN

ON/OFF Control Pin. Forcing this pin voltage above 2.4V enables the IC while forcing below 0.5V shuts

down the IC. When the IC is in shutdown mode, all functions are disabled to reduce the supply current

below 3µA.

6

CS

Power Switch Current Sense Input.

7

OUT

Boost Converter Power Switch Gate Output. This pin outputs high voltage (5V) to drive the external N-

MOSFET.

8

VCC

5V Linear Regulator Output Pin. This pin must be bypassed to GND with a ceramic capacitor.

9

VIN

Supply Input Pin. A capacitor (typical 10µF) must be connected between the VIN and GND to keep the

DC input voltage constant.

10

ADIM

Analog Dimming Pin, which is used in conjunction with DIM. When a DC voltage between 0V and 1.5V is

applied to this pin, analog dimming is achieved if DIM is tied HIGH. When a capacitor is connected

between this pin and GND, the PWM signal applied to the DIM pin is filtered and modulates the output

current. When this pin is connected to a HIGH level, direct PWM dimming is achieved.

11

COMP

Soft-Start and Control Loop Compensation.

12

DIM

PWM Dimming Control Pin, which is used in conjunction with ADIM. Apply the PWM signal to this pin. Tie

this pin to logic HIGH level, for analog dimming.

13

CH1

LED Current Sink 1. If not used—see 1- to 3-Channel Recommended Connections.

14

CH2

LED Current Sink 2. If not used—see 1- to 3-Channel Recommended Connections.

15

GND

Ground.

16

CH3

LED Current Sink 3. If not used—see 1- to 3-Channel Recommended Connections.

AL3065A

Document number: DS41124 Rev. 1 - 2

2 of 16

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August 2018

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