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What is STRF6624?

This electronic component, produced by the manufacturer "Allegro Microsystems", performs the same function as "Off-Line Quasi-Resonant Flayback Switching Regulators".


STRF6624 Datasheet PDF - Allegro Microsystems

Part Number STRF6624
Description Off-Line Quasi-Resonant Flayback Switching Regulators
Manufacturers Allegro Microsystems 
Logo Allegro Microsystems Logo 


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Series STR-F6600
INTERIM DATA SHEET
OFF-LINE QUASI-RESONANT
(Subject to change without notice)
February 22, 2000
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.
FDBK
OSC.
LATCH
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
UVLO industrial power supply units.
OVP
TSD
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
Dwg. PK-011-1
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, VDS
Series STR-F6620 . . . . . . . . . . . . 450 V
Series STR-F6630 . . . . . . . . . . . . 500 V
Series STR-F6650 . . . . . . . . . . . . 650 V
Series STR-F6670 . . . . . . . . . . . . 900 V
Drain Switching Current, ID . . .
Peak Drain Current, IDM . . . . . .
Avalanche Energy, EAS . . . . . . .
OCP/FB Voltage Range,
See Table
See Table
See Table
VOCP . . . . . . . . . . . . . . . -0.3 V to +6 V
Package Power Dissipation, PD
control (VIN x IIN(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
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 rDS(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

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STRF6624 equivalent
Series STR-F6600
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
Functional Description and Operation
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 VIN
terminal voltage during startup is shown in figure 2.
At startup, C2 is charged through the startup resistor RS.
When the VIN 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 TM = 25°C) prior to control circuit turn on. The latch
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.
IIN
30 mA
(MAX.)
IIN(ON)
Figure 1 – Start-Up Circuit
VIN
16 V ON-STATE VOLTAGE (VINT)
(TYP.)
11 V
(MAX.)
UNDER-VOLTAGE LOCKOUT (VINQ)
DRIVE WINDING
VOLTAGE
STARTUP
DELAY
TIME
Figure 2 – Waveform of VIN Terminal Voltage
at Startup
100 µA
(MAX.)
IIN(OFF)
11 V
(MAX.)
14.4 V
(MIN.)
VIN
Figure 3 – Supply Terminal Current, IIN
The value of RS thus determines the charge time of C2
and thus the startup delay. RS is typicaly 68 kfor wide
operation (90 V ac to 265 V ac) and 100 kfor 220 volt
ac operation.
The choice of C2 is a compromise between an accept-
able startup delay (in conjunction with RS) 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...
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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for STRF6624 electronic component.


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1. - Quasi-Resonant Flayback Switching Regulator

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