Series STR-F6600
INTERIM DATA SHEET
(Subject to change without notice)
February 22, 2000
OFF-LINE QUASI-RESONANT
FLYBACK SWITCHING REGULATORS
The Series STR-F6600 is specifically designed to satisfy the require-
ments for increased integration and reliability in off-line quasi-resonant
flyback converters. The series incorporates a primary control and drive
circuit with discrete avalanche-rated power MOSFETs.
Data Sheet
28102.8
FDBK
OSC.
LATCH
OCP
UVLO
OVP
TSD
Covering the power range from below 25 watts up to 300 watts for
100/115/230 VAC inputs, and up to 150 watts for 85 to 265 VAC
universal input, these devices can be used in a range of applications,
from battery chargers and set top boxes, to televisions, monitors, and
industrial power supply units.
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 series is provided in a five-pin
overmolded TO-3P style package, affording dielectric isolation without
compromising thermal characteristics.
2
3
V
IN
1
OVER-CURRENT
& FEEDBACK
4
Dwg. PK-011-1
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25
°
C
Control Supply Voltage, V
IN
. . . . . . . .
35 V
Drain-Source Voltage, V
DS
Series STR-F6620 . . . . . . . . . . . .
450 V
Series STR-F6630 . . . . . . . . . . . .
500 V
Series STR-F6650 . . . . . . . . . . . .
650 V
Series STR-F6670 . . . . . . . . . . . .
900 V
Drain Switching Current, I
D
. . .
See Table
Peak Drain Current, I
DM
. . . . . .
See Table
Avalanche Energy, E
AS
. . . . . . .
See Table
OCP/FB Voltage Range,
V
OCP
. . . . . . . . . . . . . . .
-0.3 V to +6 V
Package Power Dissipation, P
D
control (V
IN
x I
IN(ON)
) . . . . . . . . .
0.8 W
total . . . . . . . . . . . . . . . . . . .
See Graph
FET Channel Temperature, T
J
. . .
+150
°
C
Internal Frame Temperature, T
F
. .
+125
°
C
Operating Temperature Range,
T
A
. . . . . . . . . . . . . . .
-20
°
C to +125
°
C
Storage Temperature Range,
T
S
. . . . . . . . . . . . . . . .
-40
°
C to +125
°
C
GROUND
SOURCE
SUPPLY
DRAIN
5
FEATURES
s
Flyback Operation with Quasi-Resonant Soft Switching
for Low Power Dissipation and EMI
s
Rugged Avalanche-Rated MOSFET
s
Choice of MOSFET Voltage and
r
DS(on)
s
Full Over-Current Protection (no blanking)
s
Under-Voltage Lockout with Hysteresis
s
Over-Voltage Protection
s
Direct Voltage Feedback
s
Low Start-up Current (<400
µA)
s
Low-Frequency, Low-Power Standby Operation
s
Overmolded 5-Pin Package
Always order by complete part number, e.g.,
STR-F6652
.
TM
™
Series STR-F6600
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
FUNCTIONAL BLOCK DIAGRAM
V IN
4
DRIVE
REG.
UVLO
OVER-VOLT.
PROTECT
S
REF.
R
FAULT
LATCH
Q
3
2
DRAIN
SOURCE
TSD
OSC
–
r
SS
+
1.45 V
FEEDBACK &
OVER-CURRENT
PROTECTION
c
SS
–
+
0.73 V
1
GROUND
Dwg. FK-002-6
1.0
NORMALIZED ALLOWABLE AVALANCHE ENERGY in mJ
0.8
0.6
Allowable package power dissipation curves
are shown on page 10.
0.4
0.2
0
25
50
75
100
125
Dwg.
STARTING CHANNEL TEMPERATURE in
°C
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2000 Allegro MicroSystems, Inc.
TM
™
Series STR-F6600
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
OUTPUT MAXIMUM RATINGS at T
A
= +25
°
C
Part Number
STR-F6624
STR-F6626
STR-F6628
STR-F6632
STR-F6652
STR-F6653
STR-F6654
STR-F6656
STR-F6672
STR-F6674
STR-F6676
V
DSS
(V)
450
450
450
500
650
650
650
650
900
900
900
r
DS(on)
(
Ω
)
0.92
0.58
0.35
2.54
2.8
1.95
1.15
0.71
7.7
4.49
2.81
E
AS
(mJ)*
204
327
647
7.4
126
260
399
521
163
242
275
I
D
(A)†
16
16
22
9.0
7.9
5.6
9.7
16
4.6
6.0
7.8
I
DM
(A)
19
26
36
11.2
10
14
18
25
6.4
9.2
12
P
OUT
(W)
at V
IN
(V rms)
100
120
100
120
100
120
100
120
85-265
220
85-265
220
85-265
220
85-265
220
220
220
85-265
220
85-265
220
98
130
145
190
225
290
36
50
40
86
58
120
92
190
150
300
25 (no heatsink)
50 (with heat sink)
28
76
44
115
* Derate per graph, page 2
† Derate per graph, page 12
3
Series STR-F6600
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
ELECTRICAL CHARACTERISTICS at T
A
= +25
°
C, V
IN
= 18 V (unless otherwise specified).
Limits
Characteristic
On-State Voltage
Under-Voltage Lockout
Over-Voltage Threshold
Drain-Source Breakdown Voltage
Drain Leakage Current
On-State Resistance
Maximum Off Time
Minimum Pulse Duration for Input of
Quasi-Resonant Signals
Minimum Off Time
Feedback Threshold Voltage
Symbol
V
INT
V
INQ
V
OVP(th)
V
BR(DSS)
I
DSS
Test Conditions
Turn-on, increasing V
IN
Turn-off, decreasing V
IN
Turn-off, increasing V
IN
I
D
= 300
µA
At V
DS
max
V
S
= 10 V, I
D
= 0.9 A, T
J
= +25°C
Drain waveform high
Drain waveform high
1
Drain waveform high
1
Drain waveform low to high
1
Oscillation synchronized
2
Over-Current Protection/Feedback
Sink Current
Latch Holding Current
Latch Release Voltage
Switching Time
Supply Current
I
OCP/FB
I
IN(OVP)
V
IN
t
f
I
IN(ON)
I
IN(OFF)
Insulation RMS Voltage
V
WM(RMS)
V
OCP/FB
= 1.0 V
V
IN
reduced from 24.5 V to 8.5 V
I
IN
≤
20
µA,
V
IN
reduced from 24.5 V
V
DD
= 200 V, I
D
= 0.9 A
Operating
3
Increasing V
IN
prior to oscillation
All terminals simultaneous refer-
ence to a metal plate against
the backside
Output channel to mounting frame
Min.
14.4
9.0
20.5
V
DS
max
–
–
45
–
–
0.68
1.3
1.2
–
6.6
–
–
–
2000
Typ.
16
10
22.5
–
–
–
–
–
–
0.73
1.45
1.35
–
–
–
–
–
–
Max.
17.6
11
24.5
–
300
see table
55
1.0
1.5
0.78
1.6
1.5
400
8.4
250
30
100
–
Units
V
V
V
V
µA
Ω
µs
µs
µs
V
V
mA
µA
V
ns
mA
µA
V
r
DS(ON)
t
off
t
w(th)
t
off
V
FDBK
Thermal Resistance
Thermal Shutdown
R
θ
JM
T
J
–
140
–
–
1.75
–
°C/W
°C
Notes: Typical Data is for design information only.
1. Feedback is square wave, V
IM
= 2.2 V, t
h
= 1
µs,
t
l
= 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, V
IM
= 2.2 V, t
h
= 4
µs,
t
l
= 1
µs.
4
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
TM
™
Series STR-F6600
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
Functional Description and Operation
The voltage on the V
IN
terminal (pin 4) controls startup
and shutdown of the Series STR-F6600 devices.
Figure 1 shows a typical start up circuit. The V
IN
terminal voltage during startup is shown in figure 2.
At startup, C2 is charged through the startup resistor R
S
.
When the V
IN
terminal voltage reaches 16 V (typ.), the
control circuit enables regulator operation. Once the
regulator starts, it draws up to 30 mA from C2 causing the
voltage on C2 to fall momentarily. Once the regulator
output voltage is established, the drive winding D starts to
charge C2 via D2. The voltage on C2 thus recovers to the
nominal drive voltage (18 V).
As shown in figure 3, the input current is below 100
µA
(at T
M
= 25
°
C) prior to control circuit turn on. The latch
circuit holding current is 400
µA
(max.). To ensure latch
operation, the current in R
S
at the lowest ac input voltage
should be at least 500
µA.
I
IN
V
INQ
30 mA
(MAX.)
I
IN(ON)
Figure 1 – Start-Up Circuit
V
IN
16 V ON-STATE VOLTAGE (V
INT
)
(TYP.)
100
µA
(MAX.)
I
IN(OFF)
11 V
(MAX.)
V
INT
14.4 V
(MIN.)
V
IN
Figure 3 – Supply Terminal Current, I
IN
11 V
(MAX.)
UNDER-VOLTAGE LOCKOUT (V
INQ
)
OPERATION START
DRIVE WINDING
VOLTAGE
The value of R
S
thus determines the charge time of C2
and thus the startup delay. R
S
is typicaly 68 kΩ for wide
operation (90 V ac to 265 V ac) and 100 kΩ for 220 volt
ac operation.
The choice of C2 is a compromise between an accept-
able startup delay (in conjunction with R
S
) and a hold-up
time sufficient to keep pin 4 above its under-voltage
shutdown threshold of 11 V. Typically C2 is in the range
of 47
µF
to 100
µF.
continued, next page...
STARTUP
DELAY
TIME
Figure 2 – Waveform of V
IN
Terminal Voltage
at Startup
5
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