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STRF6600 Datasheet(PDF) 10 Page - Allegro MicroSystems

Part # STRF6600
Description  OFF-LINE QUASI-RESONANT FLYBACK SWITCHING REGULATORS
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

STRF6600 Datasheet(HTML) 10 Page - Allegro MicroSystems

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Series STR-F6600
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
10
TM
Functional Description and Operation (cont’d)
Over-Voltage Protection Circuit
This feature of the STR-F66xx triggers the latch circuit
when the V
IN voltage (pin 4) exceeds 22.5 V (typ.).
Because the voltage on pin 4 is proportional to the output
voltage (they are linked by the transformer turns ratio), the
regulator protects the output against over-voltage. This
function is entirely independant of the output-voltage
regulation loop and indeed will protect against output
over-voltage should the voltage error signal be lost. The
measure of over-voltage is given by:
V
OUT(OVP) = VOUT(NOM) x VIN(OVP)/VIN(NOM)
where V
IN(OVP) is the drive voltage on pin 4.
In an over-voltage sensitive application, the drive
voltage can be set to close to 20 V and thus will protect the
output, if it rises more than 10% above nominal.
VOUT
IOUT
AC LOW
AC HIGH
Figure 10 – Power Supply Output
Overload Characteristics
60
40
20
20
60
100
140
LIMITED BY FRAME
TEMP. = +125
°C MAX.
RECOMMENDED MAX.
FRAME TEMP. = +115
°C
0
TEMPERATURE in
°C
Dwg. GK-0
CONTROLLER
0.8 W MAX.
MOUNTING SURFACE
TEMPERATURE
STR-F6676, 53 W MAX.
STR-F6672, 45 W MAX.
FREE AIR
ALL DEVICES
2.8 W MAX.
60
40
20
20
60
100
140
LIMITED BY FRAME
TEMP. = +125
°C MAX.
RECOMMENDED MAX.
FRAME TEMP. = +115
°C
0
TEMPERATURE in
°C
Dwg. GK-0
CONTROLLER
0.8 W MAX.
MOUNTING SURFACE
TEMPERATURE
STR-F6656, 56 W MAX.
STR-F6654, 55 W MAX.
STR-F6653, 48 W MAX.
STR-F6652, 43 W MAX.
FREE AIR
ALL DEVICES
2.8 W MAX.
STR-F665x
STR-F667x
ALLOWABLE PACKAGE POWER DISSIPATION


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