Datasheet > AT9933DB1

AT9933DB1

更新时间： 2024-11-09 04:07:23

品牌	Logo	应用领域
超科 - SUPERTEX		驱动器
页数	文件大小	规格书
11页	1271K
描述
High Bright LED Driver IC Meeting Automotive Requirements

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AT9933DB1 数据手册

AT9933DB1

High Bright LED Driver IC

Meeting Automotive Requirements

General Description

Speciﬁcations

Parameter

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 demo board 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.

Value

9.0VDC - 16VDC

42VDC

Input voltage (steady state):

Input voltage (transient):

Output LED string voltage:

Output current:

28V max

350mA +/-5%

5% typical

Output current ripple:

300kHz (9.0V input)

430kHz (13.5V input)

500kHz (16.0V input)

Switching frequency:

Board Layout

Efﬁciency:

80% (at 13.5V input)

Included; clamps

output voltage at 33V

Open LED protection:

Included; limits current

at 350mA

Output short circuit protection:

Reverse polarity protection:

Input current limit:

-20V max

1.9A

PWM dimming frequency:

Up to 1.0kHz

Meets SAE J1113

conducted EMI

standards

Conducted EMI:

Actual Size: 2.25” x 1.25”

Connections:

Input:

Enable/PWM Dimming:

The input is connected between the terminals of connector To just enable the board, short pins 1 and 2 of connector J3

J1 as shown in the Connection Diagram.

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.

Output:

The output is connected between the terminals of connector

J2 as shown.

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

12 3 4 5 6 7...11

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