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AT9932

Supertex
Part Number AT9932
Manufacturer Supertex
Description Automotive Boost-Buck LED Lamp Driver
Published Aug 23, 2010
Detailed Description Supertex inc. Automotive Boost-Buck LED Lamp Driver IC Features ► ► ► ► ► ► ► ► ► ► ► ► ► ► Constant output current Step...
Datasheet PDF File AT9932 PDF File

AT9932
AT9932

Overview
Supertex inc.
Automotive Boost-Buck LED Lamp Driver IC Features ► ► ► ► ► ► ► ► ► ► ► ► ► ► Constant output current Steps output voltage up or down Very low susceptibility to Input voltage transients Frequency jitter Externally programmable fixed switching frequency Temperature foldback with external NTC resistor Internal 40V voltage regulator +/-1A MOSFET gate driver Short LED protection Open LED protection Input undervoltage protection Enable & PWM dimming Trimmed reference (±3% accurate) AEC-Q100 compliant www.
DataSheet4U.
com AT9932 General Description The AT9932 is an advanced fixed frequency PWM controller IC designed to control an LED lamp driver using a boost-buck topology that can step the input voltage up or down automatically.
The IC provides fast output current transient response and very low susceptibility to input voltage transients, which allows the lamp driver to pass the rigorous electrical transient requirements of SAE J1455 or ISO 7637-2, making the AT9932 an ultimate solution for automobile lighting.
Capacitive isolation protects the LED Lamp from failure of the switching MOSFET.
The AT9932 features a unique feed-forward current control scheme, differential output current sensing, soft start, protection from short or open LED load.
Switching frequency can be programmed with a single external resistor.
The AT9932 includes a temperature fold-back of the output current using an external NTC resistor.
This feature allows maximizing the light output of the LED load over the entire operating temperature range.
Applications ► Automobile lighting ► Battery powered LED lamps ► Other low voltage AC/DC or DC/DC LED drivers Typical Application Circuit CIN RIN CVDD VIN AVDD PVDD PWMD L1 GATE FFP FFN REF FLT FB DRP COMP T2 JTR Rd M1 RP RN C1 Cd D1 L2 CO ZD1 LED(s) RINC RT UVLO RT SS PGND GND NTC T1 DIV RREF RFLT RDRP CC R3 CJTR CREF RFB ROV RS CSS RNTC R2 R1 AT9932 Supertex inc.
● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-88...


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