Microchip AT9933DB1 Manual

Microchip Ikke kategoriseret AT9933DB1

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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”

Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: AT9933DB1

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