描述 Description

The TOP209/210 implements all functions necessary for an off-line switched mode control system: high voltage N-channel power MOSFET with controlled turn-on gate driver, voltage mode PWM controller with integrated oscillator, high voltage start-up bias circuit, bandgap derived reference, bias shunt regulator/error amplifier for loop compensation and fault protection circuitry. Compared to discrete MOSFET and controller or self oscillating (RCC) switching converter solutions, a TOPSwitch integrated circuit can reduce total cost, component count, size, weight and at the same time increase efficiency and system reliability. The TOP209/210 are intended for 100/110/230 VAC off-line Power Supply applications in the 0 to 8 W (0 to 5 W universal) range.

Product Highlights

Cost Effective Switcher for Low Power Applications

? Replaces linear power supplies

? Replaces discrete switcher and 20 to 50 components

– cuts cost, increases reliability

? Stand-by power supplies for Green or energy efficient

products such as personal computers, monitors, UPS,

copiers, fax machines, etc.

? Housekeeping or keep-alive power supply applications

such as TV, appliances, industrial control and personal

computers

? Meets Blue Angel low power stand-by specification

? Controlled MOSFET turn-on reduces EMI and EMI filter

costs

? 80 smaller and lighter compared to linear supply

? 50 smaller compared to discrete switcher

Over 80 Efficiency in Flyback Topology

? Built-in start-up and current limit reduce DC losses

? Low capacitance 700 V MOSFET cuts AC losses

? CMOS controller/gate driver consumes only 6 mW

? 70 maximum duty cycle minimizes conduction losses

Simplifies Design – Reduces Time to Market

? Supported by reference design boards

? Integrated PWM Controller and 700 V MOSFET in

industry standard eight pin DIP package

? Only one external capacitor needed for compensation,

bypass and start-up/auto-restart functions

? Easily interfaces with both opto and primary feedback

System Level Fault Protection Features

? Auto-restart and cycle by cycle current limiting functions

handle both primary and secondary faults

? On-chip thermal shutdown with hysteresis protects the

entire system against overload