2010/08

STR-W6700

Series

Power IC for Quasi-Resonant Type Switching Power Supply

with High Efficiency and Low Noise in Full Load Range

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The STR-W6700 series products are power ICs for quasi-resonant type switching power

supplies, incorporating a power MOSFET and a controller IC, The product achieves high

efficiency and low noise power supply systems by the quasi-resonant operation and the

bottom-skip quasi-resonant operation.

The STR-X6700 series products are the different package (TO-3PF) versions.

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Multi-Mode Control

The operation mode switching with three steps according to load conditions achieves the

optimal high efficiency and low noise power supply systems across the full load range.

(The confirmation of product number is necessary because some functions are different

in each product.)

・In Standby (Under Standby Load Conditions):

－UVLO Intermittent Oscillation by lowering output voltage --- Switched by Standby Signal, or

－Auto Burst-Oscillation --- Switched Automatically

・Under Low to Middle Load Conditions: Bottom-Skip Quasi-Resonant Operation (Bottom-Skip QR)

・Under Middle to Rating (or Heavy) Load Conditions: Quasi-Resonant Operation (QR)

Current-Mode Control

Built-in PWM Oscillator

The PWM operates with the minimum frequency of around 22 kHz, until the quasi-resonant signal becomes

valid, reduces the stress on components at startup and load-shorted.

Soft-Start Function

Step-Drive Function, reducing switching noise

Built-in Maximum ON Time Limitation Circuit

The function limits the maximum ON time of power MOSFET, during the transitions at low input voltage,

power ON/OFF.

Input Compensation at Overcurrent

The function reduces the distortion of overcurrent operation point to AC input voltage change by adding three

components.

Built-in Avalanche Energy Guaranteed High-Voltage Power MOSFET

Various Protections

Overcurrent Protection (OCP) -------------------------------- Pulse-by-Pulse

Overload Protection (OLP)-------------------------------------- Latch Shutdown

Overvoltage Protection (OVP) -------------------------------- Latch Shutdown

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Switching Power Supplies for

Digital Consumer Equipment; LCD-TVs, PDP-TVs, CRT-TVs, etc., Home Appliances, OA Equipments,

Industry Machines, Communication Devices, Others

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Product No.

MOSFET

(V)

MAX

( )

Burst-

Oscillation

Bottom-

Skip QR

Product No.

MOSFET

(V)

MAX

( )

Burst-

Oscillation

Bottom-

Skip QR

STR-W6723N

450

1.4

N

Y

STR-W6750F

650

0.73

Y

N

STR-W6734

500

1.0

Y

Y

STR-W6756

650

0.73

Y

Y

STR-W6735

500

0.57

Y

Y

STR-W6756N

650

0.73

N

Y

STR-W6735N

500

0.57

N

Y

STR-W6765

800

1.8

Y

Y

STR-W6753

650

1.7

Y

Y

STR-W6765N

800

1.8

N

Y

STR-W6754

650

0.96

Y

Y

Y: Including the function

N: Excluding the function

TO-220F-6