SEMICONDUCTOR
AS384x
Current Mode Controller
Features
¥ 2.5 V bandgap reference trimmed to 1.0% and temperature-compen...
SEMICONDUCTOR
AS384x
Current Mode Controller
Features
¥ 2.5 V bandgap reference trimmed to 1.0% and temperature-compensated
¥ Standard temperature range extended to 105¡C
¥ AS3842/3 oscillations trimmed for precision duty cycle clamp
¥ AS3844/5 have exact 50% max duty cycle clamp
¥ Advanced oscillator design simplifies synchronization
¥ Improved specs on UVLO and hysteresis provide more predictable
start-up and shutdown
¥ Improved 5 V
regulator provides better AC noise immunity
¥ Guaranteed performance with current sense pulled below ground
Description
The AS3842 family of control ICs provide pin-for-pin replacement of the industry standard UC3842 series of devices. The devices are redesigned to provide significantly improved tolerances in power supply manufacturing. The 2.5 V reference has been trimmed to 1.0% tolerance. The oscillator discharge current is trimmed to provide guaranteed duty cycle clamping rather than specified discharge current. The circuit is more complet...