at9932主要特性：
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
at9932应用：
automobile lighting
battery powered led lamps
other low voltage ac/dc or dc/dc led drivers
图1。at9932功能方框图
图2。at9932典型应用电路图
