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NCP1562B

ON Semiconductor
Part Number NCP1562B
Manufacturer ON Semiconductor
Description High Performance Active Clamp/Reset PWM Controller
Published Jan 16, 2007
Detailed Description NCP1562A, NCP1562B High Performance Active Clamp/Reset PWM Controller The NCP1562x is a family of voltage mode controll...
Datasheet PDF File NCP1562B PDF File

NCP1562B
NCP1562B


Overview
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, 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.
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 overvoltage 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 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  Fixed Frequency Operation up to 1.
0 MHz  Bidirectional Frequency Synchronization  Independent Line Undervoltage and Overvoltage Detectors  Accurate Programmable Maximum Duty Cycle Limit  Programmable Maximum Volt- Second Product  Programmable Soft- Start  Inter...


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