STR-F6600 Просмотр технического описания (PDF) - Allegro MicroSystems
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STR-F6600 Datasheet PDF : 16 Pages
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Series STR-F6600
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
Functional Description and Operation (cont’d)
Over-Voltage Protection Circuit
VOUT
This feature of the STR-F66xx triggers the latch circuit
when the VIN 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:
VOUT(OVP) = VOUT(NOM) x VIN(OVP)/VIN(NOM)
where VIN(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.
AC LOW
AC HIGH
IOUT
Figure 10 – Power Supply Output
Overload Characteristics
ALLOWABLE PACKAGE POWER DISSIPATION
60
40
20
0
10
STR-F665x
MOUNTING SURFACE
TEMPERATURE
STR-F6656, 56 W MAX.
STR-F6654, 55 W MAX.
STR-F6653, 48 W MAX.
STR-F6652, 43 W MAX.
STR-F667x
60
MOUNTING SURFACE
TEMPERATURE
STR-F6676, 53 W MAX.
STR-F6672, 45 W MAX.
40
CONTROLLER
0.8 W MAX.
FREE AIR
ALL DEVICES
2.8 W MAX.
RECOMMENDED MAX.
FRAME TEMP. = +115°C
LIMITED BY FRAME
TEMP. = +125°C MAX.
20
60
100
140
TEMPERATURE in °C
Dwg. GK-0
20
CONTROLLER
0.8 W MAX.
FREE AIR
ALL DEVICES
2.8 W MAX.
RECOMMENDED MAX.
FRAME TEMP. = +115°C
LIMITED BY FRAME
TEMP. = +125°C MAX.
0
20
60
100
TEMPERATURE in °C
140
Dwg. GK-0
™TM
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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