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