CM9330 Datasheet, PDF (6/10 Pages) California Micro Devices Corp – Asymmetrical High Efficiency Three Channel Boost LED Driver

PRELIMINARY
CM9330
Functional Block Diagram
VIN
EN
ISET1
ISET2
ISET3
MODE
UVLO
BIAS
BG
ENABLE
OSC
PMW
LOGIC
OVP
D4
D1
CONTROL
Q1
D2
Q2
D3
CM9330
GND
VOUT
SW
Q4
R
LED1
LED2
LED3
Q3
Pin Descriptions
LEAD(s)
1
NAME
ISET1
2
LED1
3
NC
4
ISET2
5
LED2
PIN DESCRIPTIONS
DESCRIPTION
Channel 1 LED current set pin. Between this pin and GND connect the R_SET1 resistor, calcu-
lated as follows:
R_SET1(kΩ)
=
-----------4---5---0-----------
I_LED1(mA)
where I_LED1 is the DC LED current in channel 1.
Pin to cathode of channel 1 LED string.
Not internally connected. For better heat flow, connect to GND.
Channel 2 LED current set pin. Between this pin and GND connect the R_SET2 resistor, calcu-
lated as follows:
R_SET2(kΩ)
=
-----------4---5---0-----------
I_LED2(mA)
where I_LED2 is the DC LED current in channel 2.
Pin to cathode of channel 2 LED string.
© 2006 California Micro Devices Corp. All rights reserved.
6 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: [phone] l Fax: [phone] l www.cmd.com
04/26/06