Allegro STR-G6651-FL, STR-G6651 Datasheet

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
STR-G6651
OFF-LINE QUASI-RESONANT FLYBACK SWITCHING REGULATOR
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1999, 2000 Allegro MicroSystems, Inc.
FUNCTIONAL BLOCK DIAGRAM
FEEDBACK & OVER-CURRENT PROTECTION
GROUND
V
IN
SOURCE
DRAIN
Dwg. FK-002-5
0.73 V
TSD
OVER-VOLT.
PROTECT
R
SQ
REF.
FAULT LATCH
4
1
2
1.45 V
UVLO
+
5
+
1.35 mA
3
DRIVE
REG.
OSC
ALLOWABLE PACKAGE POWER DISSIPATION
MAXIMUM SAFE OPERATING AREA
30
20
10
20 60 100
1.5 W
140
LIMITED BY FRAME TEMP. = +125°C MAX.
FREE AIR
27 W
0
TEMPERATURE in °C
ALLOWABLE PACKAGE POWER DISSIPATION in WATTS
MOUNTING SURFACE TEMPERATURE
Dwg. GK-003-4
0.8 W
CONTROLLER
50
5
0.5
0.05
DRAIN-SOURCE VOLTAGE in VOLTS
DRAIN CURRENT in AMPERES
Dwg. GK-004-5
0.15
1.5
15
3.0
10 30 100 300
NO HEAT SINK NATURAL COOLING T
A
= +25°C
t
w
= 1 ms SINGLE PULSE
1000
t
w
=
0
.1
m
s S
IN
G
L
E
P
U
L
S
E
LIMITED BY V
DS
max
LIMITED BY
r
DS(on)
STR-G6651
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATOR
www.allegromicro.com
ELECTRICAL CHARACTERISTICS at TA = +25°C, VIN = 18 V, VDD = 10 V, VS = 0, voltage mea­surements are referenced to ground terminal (unless otherwise specified).
Limits
Characteristic Symbol Test Conditions Min. Typ. Max. Units
On-State Voltage V
INT
Turn-on, increasing V
IN
14.4 16 17.6 V
Under-Voltage Lockout V
INQ
Turn-off, decreasing V
IN
9.0 10 11 V
Over-Voltage Threshold V
OVP(th)
Turn-off, increasing V
IN
20.5 22.5 24.5 V
Drain-Source Breakdown Voltage V
(BR)DSS
ID = 300 µA 650 V
Drain Leakage Current I
DSS
VDS = 650 V 300 µA
On-State Resistance r
DS(on)
VS = 10 V, ID = 0.9 A, TJ = +25°C– –3.95
Maximum OFF Time t
off
Drain waveform high 45 55 µs
Minimum Pulse Duration for Input of Quasi-Resonant Signals t
w(th)
Drain waveform high
1
––1.0µs
Minimum OFF Time t
off
Drain waveform high
1
––1.5µs
Feedback Threshold Voltage V
FDBK
Drain waveform low to high
1
0.68 0.73 0.78 V
Oscillation synchronized
2
1.3 1.45 1.6 V
Over-Current Protection/Feedback Sink Current I
OCP/FB
V
OCP/FB
= 1.0 V 1.2 1.35 1.5 mA
Latch Holding Current I
IN(OVP)
VIN reduced from 24.5 V to 8.5 V 400 mA
Latch Release Voltage V
IN
IIN ≤ 20 µA, VIN reduced from 24.5 V 6.6 8.4 V
Switching Time t
f
VDD = 200 V, ID = 0.9 A 250 ns
Supply Current I
IN(ON)
Operating
3
––30mA
I
IN(OFF)
Increasing VIN prior to oscillation 100 µA
Insulation RMS Voltage V
WM(RMS)
All terminals simultaneous refer-
2000 V
ence metal plate against backside
Thermal Shutdown T
J
140 °C
Thermal Resistance R
θ
JM
Output junction-to-mounting frame 1.63 °C/W
Notes: Typical Data is for design information only.
1. Feedback is square wave, VIM = 2.2 V, th = 1 µs, tl = 35 µs
2. For quasi-resonant operation, the input signal must be longer than t
w(th)
and greater than V
FDBK
3. Feedback is square wave, VIM = 2.2 V, th = 4 µs, tl = 1 µs
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