ZXLD1322

ZXLD1322

Document number: DS32166 Rev. 3 - 2

3 of 17

www.diodes.com

April 2010

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Pin Description

Name

Pin #

Description

ADJ

1

Adjust input

•

•

of set value. (DC brightness control mode)

•

Drive with low frequency (200Hz) PWM control signal to gate output ‘on’ and ‘off’ at

the PWM frequency. (PWM brightness control mode)

•

BIAS

2

Bias pin for setting base current of internal switch transistor

•

Short pin to ground to define maximum base drive current for output switch

(Maximum output current condition)

•

(Reduced output current condition)

CFB

3

Control input/output for feedback control loop

•

Connect 10nF capacitor from this pin to ground to provide loop compensation

N/C

4

Not connected internally (Open circuit)

ISENSE

5

Switch peak current sense pin

•

EMITTER1

6

Switch emitters (Connect both pins to top of RSENSE to sense emitter current)

EMITTER2

7

COLLECTOR2

8

Switch Collectors (Connect both pins to lower side of coil)

COLLECTOR1

9

N/C

10

Internally connected - Do not connect to external circuitry

M_VIN

11

Input supply to high side current monitor

•

Connect output voltage (whichever is higher)

•

VIN

12

Input supply voltage and load side input of high side current monitor.

Connect to sensing resistor RM.

TADJ

13

Temperature Adjust input for LED thermal compensation

•

Connect thermistor/resistor network to this pin to reduce output current above a

preset temperature threshold.

•

(see section on temperature control for details)

VREF

14

Internal 0.5V reference voltage output

Exposed Pad

15

Connect to ground (0V)