NCP1562A, NCP1562B
High Performance Active Clamp/Reset PWM Controller
The NCP1562x is a family of voltage mode controll...
NCP1562A, NCP1562B
High Performance Active Clamp/Reset PWM Controller
The NCP1562x is a family of
voltage mode controllers designed for dc- dc converters requiring high- efficiency and low parts count. These controllers incorporate 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.
The NCP1562 family reduces component count and system size by incorporating high accuracy on critical specifications such as maximum duty cycle limit, under
voltage 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. The cycle skip detector enables a soft- stop sequence if a continuous overcurrent condition is present.
Additional features found in the NCP1562 include line feedforward, frequency synchronization up to 1.0 MHz, cycle- by- cycle current limit with leading edge blanking (LEB), independent under and over
voltage detectors, adjustable output overlap delay, programmable maximum duty cycle, internal startup circuit and soft- start.
Features
Dual Control Outputs with Adjustable Overlap Delay >2.0 A Output D...