Low Power PWM Controller with On−Chip Power Switch and Startup Circuits for 48V Telecom Systems

 

 

The NCP1030 and NCP1031 are a family of miniature high−voltage

monolithic switching regulators with on−chip Power Switch and Startup

Circuits. The NCP103x family incorporates in a single IC all the active

power, control logic and protection circuitry required to implement, with

minimal external components, several switching regulator applications,

such as a secondary side bias supply or a low power dc−dc converter.

This controller family is ideally suited for 48 V telecom, 42 V automotive

and 12 V input applications. The NCP103x can be configured in any

single−ended topology such as forward or flyback. The NCP1030 is

targeted for applications requiring up to 3 W, and the NCP1031 is

targeted for applications requiring up to 6 W.

The internal error amplifier allows the NCP103x family to be easily

configured for secondary or primary side regulation operation in

isolated and non−isolated configurations. The fixed frequency oscillator

is optimized for operation up to 1 MHz and is capable of external

frequency synchronization, providing additional design flexibility. In

addition, the NCP103x incorporates individual line undervoltage and

overvoltage detectors, cycle by cycle current limit and thermal

shutdown to protect the controller under fault conditions. The preset

current limit thresholds eliminate the need for external sensing

components.

 

 

 

Features

 On Chip High 200 V Power Switch Circuit and Startup Circuit

 Internal Startup Regulator with Auxiliary Winding Override

 Operation up to 1 MHz

 External Frequency Synchronization Capability

 Frequency Fold−down Under Fault Conditions

 Trimmed ± 2% Internal Reference

 Line Undervoltage and Overvoltage Detectors

 Cycle by Cycle Current Limit Using SENSEFET

 Active LEB Circuit

 Overtemperature Protection

 Internal Error Amplifier

 Pb−Free Packages are Available

 

Typical Applications

 POE (Power Over Ethernet)/PD. Refer to Application Note AND8247.

 Secondary Side Bias Supply for Isolated dc−dc Converters

 Stand Alone Low Power dc−dc Converter

 Low Power Bias Supply

 Low Power Boost Converter

 

 

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