STRG6653, Elektronika, Układy scalone
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STR-G6651
OFF-LINE QUASI-RESONANT
FLYBACK SWITCHING REGULATOR
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.
FDBK
OSC.
LATCH
Cycle-by-cycle current limiting, under-voltage lockout with hyster-
esis, 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.
UVLO
OVP
TSD
Dwg. PK-011
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.
C
Control Supply Voltage, V
IN
. . . . . . .
35 V
Drain-Source Voltage, V
DS
. . . . . . . .
650 V
Drain Current, I
D
continuous . . . . . . . . . . . . . . . . . .
2.7 A
single-pulse, t
w
°
FEATURES
Quasi-Resonant Operation
Output Power to 66 W
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 (V
IN
x I
IN(ON)
) . . . . . . . . .
0.8 W
total . . . . . . . . . . . . . . . . . . .
See Graph
FET Channel Temperature, T
J
≤
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
. . .
+150
°
C
Adjustable Switching Speed for EMI Control
Internal Frame Temperature, T
F
. .
+125
°
C
Overmolded Five-Pin Package
Operating Temperature Range,
T
A
. . . . . . . . . . . . . . .
-20
°
C to +125
°
C
Storage Temperature Range,
T
S
. . . . . . . . . . . . . . .
-40
°
C to +125
°
C
Always order by complete part number:
STR-G6651
.
â„¢
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25
STR-G6651
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATOR
FUNCTIONAL BLOCK DIAGRAM
V
IN
4
DRIVE
REG.
UVLO
R
1
DRAIN
OVER-VOLT.
PROTECT
FAULT
LATCH
2
SOURCE
S
Q
REF.
TSD
OSC
–
+
1.45 V
–
5
FEEDBACK &
OVER-CURRENT
PROTECTION
+
0.73 V
3
GROUND
Dwg. FK-002-5
ALLOWABLE PACKAGE POWER DISSIPATION
MAXIMUM SAFE OPERATING AREA
30
50
MOUNTING SURFACE
TEMPERATURE
27 W
15
20
5
LIMITED
BY
r
DS(on)
1.5
LIMITED BY FRAME
TEMP. = +125
°
C MAX.
10
0.5
NO HEAT SINK
NATURAL COOLING
T
A
= +25
°
C
FREE AIR
0.15
CONTROLLER
1.5 W
0.8 W
0
0.05
20
60
100
140
3.0
10
30
100
300
1000
TEMPERATURE in
C
DRAIN-SOURCE VOLTAGE in VOLTS
Dwg. GK-003-4
Dwg. GK-004-5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
â„¢
Copyright © 1999, 2000 Allegro MicroSystems, Inc.
°
STR-G6651
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATOR
C, V
IN
= 18 V, V
DD
= 10 V, V
S
= 0, voltage mea-
surements 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
I
D
= 300
µ
A
650 –
– V
Drain Leakage Current
I
DSS
V
DS
= 650 V
–
– 300
µ
A
On-State Resistance
r
DS(on)
V
S
= 10 V, I
D
= 0.9 A, T
J
= +25
°
C–
– 3.95
Ω
Maximum OFF Time
t
off
Drain waveform high
45 – 55
µ
s
Minimum Pulse Duration for Input of
Quasi-Resonant Signals
t
w(th)
Drain waveform high
1
–
– 1.0
µ
s
Minimum OFF Time
t
off
Drain waveform high
1
–
– 1.5
µ
s
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)
V
IN
reduced from 24.5 V to 8.5 V –
– 400 mA
Latch Release Voltage
V
IN
I
IN
≤
20
µ
A, V
IN
reduced from 24.5 V 6.6 – 8.4 V
Switching Time
t
f
V
DD
= 200 V, I
D
= 0.9 A
–
– 250 ns
Supply Current
I
IN(ON)
Operating
3
–
– 30 A
I
IN(OFF)
Increasing V
IN
prior to oscillation –
– 100
µ
A
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
s
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, V
IM
= 2.2 V, t
h
= 4
µ
s, t
l
= 35
µ
µ
s, t
l
= 1
µ
s
www.allegromicro.com
ELECTRICAL CHARACTERISTICS at T
A
= +25
Notes: Typical Data is for design information only.
1. Feedback is square wave, V
IM
= 2.2 V, t
h
= 1
STR-G6651
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATOR
ALLOWABLE AVALANCHE ENERGY
200
150
SINGLE PULSE
DRAIN CURRENT = 1.8 A
100
50
0
0
20
40
60
80
100
120
140
160
STARTING CHANNEL TEMPERATURE in
°
C
Dwg. GK-009-2
STR-G6600 Series
Drain-Source Drain-Source
Output Breakdown Voltage ON Resistance
at I
D
= 300
µ
A
at I
D
= 0.9 A
Part Number
V
(BR)DS
, Minimum
r
DS(on)
, Maximum Output Power
For 100/120 V AC Input
STR-G6622
450 V
2.18
Ω
44 W – 60 W
STR-G6624
450 V
0.92
Ω
98 W – 130 W
For 110/120 V AC Input
STR-G6632
500 V
2.62
Ω
36 W – 50 W
For 200/220 V AC Input
STR-G6651
650 V
3.95
Ω
66 W
STR-G6652
650 V
2.80
Ω
86 W
STR-G6653
650 V
1.95
Ω
120 W
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
â„¢
STR-G6651
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATOR
TYPICAL QUASI-RESONANT FLYBACK CONVERSION USING STR-G6651
WARNING:
lethal potentials are present. See text.
+ OUTPUT
4
DRIVE
REG.
UVLO
R
1
OVER-VOLT.
PROTECT
FAULT
LATCH
2
VOLTAGE
SENSE
S
Q
REF.
+
TSD
OSC
+
– OUTPUT
–
+
1.45 V
–
5
+
0.73 V
3
Dwg. EK-003-4A
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.
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
www.allegromicro.com
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