ACT357B power supply controller IC

The ACT357B is optimized for cost-sensitive applications,
and utilizes Active-semis proprietary primary-
side feedback architecture to provide accurate
constant voltage, constant current (CV/CC) regulation
without the need of an opto-coupler or reference
device. Integrated line and primary inductance
compensation circuitry provides accurate constant
current operation despite wide variations in line voltage
and primary inductance. Integrated output cord
resistance compensation further enhances output
accuracy. These products achieve excellent regulation
and transient response, yet requires less than
300mW of standby power.
The ACT357B is optimized for 3.5W to 4.5W applications
(such as 5V/700mA to 5V/900mA CV/CC
chargers). It is available in space-saving 4-pin SIP-
4 and 5-pin SOT23-5 packages.

The ACT357B ensures safe operation with complete
protection against all fault conditions. Built-in
protection circuitry is pro