Microchip Technology AT9932
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. This 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.| Part No. | AT9932 |
|---|---|
| Datasheet | AT9932 Download |
| Manufacturer |  Microchip Technology |
| Description | Automotive Boost-Buck LED Lamp Driver |
| Buy | Stock & Price |
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 Lockout Protection
● Enable and PWM Dimming
● ±3% Accurate Trimmed Reference
● AEC-Q100 Compliant
APPLICATIONS
● Automobile Lighting● Battery-Powered LED Lamps
● Other Low-Voltage AC/DC or DC/DC LED Drivers
GENERAL DESCRIPTION
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 and protection from short or open LED load. Switching frequency can be programmed with a single external resistor. The AT9932 includes a temperature foldback of the output current using an external NTC resistor.
