The STR-G6651 is specifically designed to satisfy the requirements
for increased integration and reliability in off-line quasi-resonant flyback
converters. This device incorporates the primary control and drive
circuit with a discrete avalanche-rated power MOSFET.
Cycle-by-cycle current limiting, under-voltage lockout with hysteresis, over-voltage protection, and thermal shutdown protects the power
supply during the normal overload and fault conditions. Over-voltage
protection and thermal shutdown are latched after a short delay. The
latch may be reset by cycling the input supply. Low-current startup and
a low-power standby mode selected from the secondary circuit completes
a comprehensive suite of features. The device is provided in a five-pin
over-molded TO-220 style package, affording dielectric isolation without
compromising thermal characteristics. Two lead forms are available
(with and without the suffix ‘-LF’) to accommodate printed wiring board
layout or mechanical constraints.
Proven in substantial volumes, the STR-G6651 is a robust low-risk
solution for off-line power supplies particularly where management of
EMI at the source is a significant element of the system design.
FEATURES
■ Quasi-Resonant Operation
■ Output Power to 66 W
■ Low-Loss, Pulse-Ratio-Control Standby Mode
■ Temperature-Compensated Pulse-by-Pulse Over-Current Protection
■ Latched Over-Voltage and Thermal Protection
■ Under-Voltage Lockout with Hysteresis
■ Active Low-Pass Filter for Enhanced Light-Load Stability
■ Switched Attenuation of Leading-Edge Current-Sensing Signal
■ Regulated Soft Gate Drive
■ Adjustable Switching Speed for EMI Control
■ Overmolded Five-Pin Package
OFF-LINE QUASI-RESONANT
FLYBACK SWITCHING REGULATOR
Always order by complete part number: STR-G6651 .
Data Sheet
28102.9A
™
STR-G6651
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25°C
Control Supply Voltage, VIN. . . . . . . 35 V
Drain-Source Voltage, VDS. . . . . . . . 650 V
Drain Current, I
D
continuous . . . . . . . . . . . . . . . . . . 2.7 A
single-pulse, tw ≤ 1 ms . . . . . . . . 7.2 A
Avalanche Energy, E
AS
single-pulse . . . . . . . . . . . . . . . 158 mJ
Over-Current Protection Voltage Range,
V
OCP
. . . . . . . . . . . . . . . -0.3 V to +6 V
Insulation RMS Voltage,
V
WM(RMS)
. . . . . . . . . . . . . . . . . . 2000 V
Package Power Dissipation, P
D
control (VIN x I
IN(ON)
) . . . . . . . . . 0.8 W
total . . . . . . . . . . . . . . . . . . . See Graph
FET Channel Temperature, TJ. . . +150°C
Internal Frame Temperature, TF. . +125°C
Operating Temperature Range,
TA. . . . . . . . . . . . . . . -20°C to +125°C
Storage Temperature Range,
TS. . . . . . . . . . . . . . . -40°C to +125°C
SOURCE
DRAIN
OVERCURRENT
& FEEDBACK
GROUND
Dwg. PK-011
VIN
1
2
3
4
5
UVLO
OVP
TSD
LATCH
OSC.
OCP
FDBK
SUPPLY