STR-G665

3

OFF-LINE

QUASI-RESONANT FLYBACK

SWITCHING REGULATOR

WARNING — These devices are designed to be operated at lethal voltages and energy levels. Circuit

designs that embody these components must conform with applicable safety requirements. Precau-

tions must be taken to prevent accidental contact with power-line potentials. Do not connect

grounded test equipment.

The use of an isolation transformer is recommended during circuit development and breadboarding.

+

VOLTAGE

SENSE

+ OUTPUT

– OUTPUT

+

+

Dwg. EK-003-4

5

0.73 V

–

–

TSD

OVER-VOLT.

PROTECT

R

SQ

REF.

FAULT

LATCH

4

1

2

1.45 V

UVLO

+

5

+

OSC

3

DRIVE

REG.

TYPICAL QUASI-RESONANT FLYBACK CONVERSION USING STR-G665

3

WARNING: lethal potentials are present. See text.

Recommended mounting hardware torque:

4.34 - 5.79 lbf•ft (6 – 8 kg•cm or 0.588 – 0.784 Nm).

Recommended silicone grease:

Dow Corning SC102, Toshiba YG6260, Shin-Etsu G746., or equivalent