Microchip AT9933DB1 Handleiding

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Supertex inc.

Supertex inc.

www.supertex.com

AT9933DB1

Doc.# DSDB-AT9933DB1

A032713

General Description

The AT9933DB1 is an LED driver capable of driving up

to 7 1-watt LEDs in series from an automotive input of

9 - 16V DC. The demoboard uses Supertex’s AT9933

in a boost-buck topology. The converter operates at

frequencies in excess of 300kHz and has excellent output

current regulation over the input voltage range. It can also

withstand transients up to 42V and operate down to 6V

input. The converter is also protected against open LED

and output short circuit conditions. Protection against

reverse polarity up to 20V is also included.

Board Layout

High Bright LED Driver IC Demoboard

Meeting Automotive Requirements

Specications

Parameter Value

Input voltage (steady state):9.0 - 16VDC

Input voltage (transient):42VDC

Output LED string voltage:28V max

Output current:350mA +/-5%

Output current ripple:5% typical

Switching frequency:

300kHz (9.0V input)

430kHz (13.5V input)

500kHz (16.0V input)

Efciency: 80% (at 13.5V input)

Open LED protection:Included; clamps

output voltage at 33V

Output short circuit protection:Included; limits current

at 350mA

Reverse polarity protection:-20V max

Input current limit:1.9A

PWM dimming frequency:Up to 1.0kHz

Conducted EMI:

Meets SAE J1113

conducted EMI

standards

Connections:

Input:

The input is connected between the terminals of connector

J1 as shown in the Connection Diagram.

Output:

The output is connected between the terminals of connector

J2 as shown.

Enable/PWM Dimming:

To just enable the board, short pins 1 and 2 of connector J3

as shown. For PWM dimming, connect the external push-pull

square wave source between terminals 1 and 3 of connector

J3 as shown by the dotted lines.

Note:

During PWM dimming, pin 2 of connector J3 should be left

open. Also, the PWM signal must have the proper polarity

with the positive connected to pin 1 of J3. Note that pin 3

of J3 is internally connected to the return path of the input

voltage

Actual Size: 2.25” x 1.25”

Product specificaties