CM9320 datasheet(6/10 Pages) CALMIRCO

Part #	CM9320

Description	Asymmetrical High Efficiency Two Channel Boost LED Driver

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Manufacturer	CALMIRCO [California Micro Devices Corp]

Direct Link	http://www.calmicro.com

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6 / 10 page

6

490 N. McCarthy Blvd., Milpitas, CA 95035-5112

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Tel: 408.263.3214

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Fax: 408.263.7846

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www.cmd.com

05/08/06

CM9320

PRELIMINARY

Pin Descriptions

VIN

CM9320

ISET1

EN

SW

VOUT

LE D2

LE D1

ISET2

PMW

LOGIC

GND

CONTROL

OVP

Q1

Q2

Q4

D1

D2

D4

OSC

BG

UVLO

BIAS

R

ENABLE

PIN DESCRIPTIONS

LEAD(s)

NAME

DESCRIPTION

1

ISET1

Channel 1 LED current set pin. Between this pin and GND connect the RSET1 resistor, calcu-

lated as follows:

where ILED1 is the DC LED current in channel 1.

2

LED1

Pin to cathode of channel 1 LED string.

3

NC

Not internally connected. For better heat flow, connect to GND.

4

ISET2

Channel 2 LED current set pin. Between this pin and GND connect the RSET2 resistor, calcu-

lated as follows:

where ILED2 is the DC LED current in channel 2.

5

LED2

Pin to cathode of channel 2 LED string.

6

VIN

Input supply voltage pin. Bypass with a 10µF or larger ceramic capacitor to ground.

7

GND

Ground terminal pin.

8

SW

Switching node. Internally connected to the drain of the integrated switch.

9

VOUT

Output voltage pin, which connects to the anodes of all LEDs. Bypass with a 1.0µF or greater

ceramic capacitor to ground for low output ripple voltage.

RSET1 kΩ

()

450

I

LED1 mA

()

-----------------------------

=

RSET2 kΩ

()

450

ILED2 mA

()

-----------------------------

=

Functional Block Diagram

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CM9320 Datasheet(PDF) 6 Page - California Micro Devices Corp

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