PFS725 Ver la hoja de datos (PDF) - Power Integrations, Inc
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PFS725 Datasheet PDF : 30 Pages
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PFS704-729EG
120
110
230 VAC
100
90
80
70
60
50
40
30
20
Peak Load
10
0
180 VAC
45
135 VAC 115 VAC
90 VAC
90
135
180
120
110
VIN = 115 VAC
100
90
80
70
60
50
40
30
20
10
0
45
100% Peak Load
Expected Frequency
Range at Peak
Rated Load
75% Peak Load
50% Peak Load
25% Peak Load
90
135
180
Line Conduction Angle (°C)
Line Conduction Angle (°C)
Figure 8. (a) Frequency Variation Over Line Half-Cycle as a Function of Input Voltage (b) Frequency Variation Over Line Half-Cycle as a Function of Load.
~5 V
~5 V
~2.5 V
PFS704-716
VIN > 170 VAC
PFS704-716
VIN < 140 VAC
~1.25 V
~2.5 V
PFS704-716
~0.8 V
PFS723-729
~4.8 V
~5 V
VE
(full power)
~140 VAC
~170 VAC
VIN
PI-5338-021711
Figure 9. VOFF vs. VE and VOFF vs. Input Voltage.
controlled with respect to the internal error-voltage level (output
power) to allow the converter to maintain output voltage
regulation and relatively flat conversion efficiency between 10%
to 100% of rated load which is essential to meet many efficiency
directives.
The degree of frequency slide is also controlled as a function of
peak input line voltage, at high input line the maximum off-time
voltage reference at zero error-voltage will be approximately 1/2
of the maximum value at low input line conditions.
The lower VOFF slope reduces the average frequency swing for
high input line operation.
Protection Modes
VOLTAGE MONITOR (V) Pin Shutdown
The VOLTAGE MONITOR pin features a shutdown protection
mode which can be used with the VOLTAGE MONITOR pin
resistor or external circuitry to cover system faults. During
start-up (1 V < VFB < 5.8 V) in the event the current through the
VOLTAGE MONITOR pin exceeds the IV(OFF) threshold for a
duration exceeding approximately (1 ms), the IC disables the
internal MOSFET for the entire duration that the V pin current is
above IV(OFF). In normal operation, if the current through the V
pin exceeds the IV(OFF) threshold for a duration exceeding tV(OFF),
the IC will re-initiate the start-up sequence.
Brown-In Protection (IUV+)
The VOLTAGE MONITOR pin features an input line undervoltage
detection to limit the minimum start-up voltage detected
through the V pin. This detection threshold will inhibit the
device from starting at very low input AC voltage.
Brown-Out Protection (IUV-)
The V pin features a brown-out protection mode wherein the
HiperPFS will turn-off when the V pin current is below the Line
UV-threshold for a period exceeding the tREFRESH time period. In
the event a single half-line cycle is missing (normal operating
line frequency is 47 to 63 Hz) the brown-out protection will not
be activated. The HiperPFS shutdown in effect gradually
reduces the internal error-voltage to zero volts at rate of 1 V/ms
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Rev. G 06/15
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