Microchip AT9919DB1 Handleiding

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Supertex inc.

Supertex inc.

www.supertex.com

Doc.# DSDB-AT9919DB1

A032713

AT9919DB1

Single, High Current, LED Driver Demoboard

Specications

The AT9919BDB1 demoboard is a high current LED driver

designed to drive one LED at 1.0A from a 9.0 - 16VDC input.

The demoboard uses Supertex’s AT9919 hysteretic buck

LED driver IC.

The AT9919DB1 includes two PWM dimming modes. The

analog control of the PWM dimming mode allows the user to

dim the LED using a 0 - 2.0V analog signal applied between

the ADIM and GND pins (0V gives 0% and 2.0V gives 100%).

In this mode, the PWM dimming frequency is set to 1kHz on

the board. The digital control of PWM dimming mode allows

the user to dim the LEDs using an external, TTL-compatible

square wave source applied between DIM and GND. In this

case, the PWM dimming frequency and duty ratio are set by

the external square wave source.

Parameter Value

Input voltage9.0 - 16VDC (steady state)

40V max (transient)

Reverse polarity protection60V (max)

Output voltage 2.0 - 5.0V

Output current1.0A ± 5%

Output current ripple (@13.5V

input and 3.3V output)16% (peak to peak)

Full load efciency

(@13.5V input)84%

Open LED protectionYes

Output short circuit protectionYes

Dimensions25.4mm X 25.4mm

General Description

Connection Diagram

Input Connection: Connect the input DC voltage between

VIN and GND terminals of connector J1 as shown in the

connection diagram.

Output Connection: Connect the LEDs between LED+

(anode of LED string) and LED- (cathode of LED string) of

connector J2.

PWM Dimming Connection:

1. If no PWM dimming is required, short DIM, VDD and

ADIM terminals of connector J3.

2. If dimming using an external PWM dimming source,

connect the PWM source between the DIM and GND

terminals of connector J3 and short terminals ADIM

and VDD. The recommended PWM dimming frequen-

cy is ≤1.0kHz.

3. If dimming using an external analog voltage source,

connect the source between the ADIM and GND ter-

minals of connector J3 and short terminals DIM and

VDD. The voltage range for control of the PWM dim-

ming is 0 - 2.0V.

Connections

Silk Screen

Product specificaties