The NCP1562ADR2G is a high-performance active clamp/reset Pulse Width Modulation (PWM) Controller designed for DC-DC converters requiring high-efficiency and low parts count. It incorporates two in phase outputs with an overlap delay to prevent simultaneous conduction and facilitates soft switching. The main output is designed for driving a forward converter primary MOSFET. The secondary output is designed for driving an active clamp circuit MOSFET, a synchronous rectifier on the secondary side, or an asymmetric half bridge circuit. It reduces component count and system size by incorporating high accuracy on critical specifications such as maximum duty cycle limit, undervoltage detector and overcurrent threshold. Two distinctive features of the NCP1562 are soft-stop and a cycle skip current limit with a time threshold. Soft-stop circuitry powers down the converter in a controlled manner if a severe fault is detected.
● Dual control outputs with adjustable overlap delay
● >2A Output drive capability
● Soft-stop powers down converter in a controlled manner
● Cycle-by-cycle current limit
● Cycle skip initiated if continuous current limit condition exists
● Voltage mode operation with input voltage feedforward
● Bidirectional frequency synchronization
● Independent line undervoltage and overvoltage detectors
● Accurate programmable maximum duty cycle limit
● Programmable maximum volt-second product
● Programmable soft-start
