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TOP209

Three-terminal Off-line PWM Switch

Power Integrations, Inc 

®

TOP209/210

TOPSwitch® Family

Three-terminal Off-line PWM Switch

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

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

+

Wide-Range

DC Input

D

TOPSwitch

CONTROL

C

-

S

Figure 1. Typical Application.

PI-2043-052397

TOPSwitch Selection Guide

ORDER

PART

NUMBER

OUTPUT POWER RANGE

PACKAGE

230 VAC or

110 VAC

w/Doubler

85-265

VAC

TOP209P

TOP209G

DIP-8

SMD-8

0-4 W

0-2 W

TOP210PFI

TOP210G

DIP-8

SMD-8

0-8 W

0-5 W

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.

August 1997

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