PFS704 POWERINT [Power Integrations, Inc.], PFS704 Datasheet - Page 7

• Manufacturer Part Number: PFS704
• Description: High Power PFC Controller with Integrated High-Voltage MOSFET
• Manufacturer: POWERINT [Power Integrations, Inc.]

Figure 9.
Figure 8.
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 V
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 < V
www.powerint.com
120
110
100
90
80
70
60
50
40
30
20
10
0
230 VAC
Peak Load
V
(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.
OFF
OFF
vs. V
slope reduces the average frequency swing for
~1.25 V
FB
~2.5 V
~0.8 V
E
and V
~5 V
< 5.8 V) in the event the current through the
45
Line Conduction Angle (°C)
180 VAC
OFF
vs. Input Voltage.
PFS723-729
V
PFS704-716
IN
> 170 VAC
135 VAC
90
V
PFS704-716
IN
115 VAC
< 140 VAC
135
~4.8 V
90 VAC
(full power)
~5 V
180
VOLTAGE MONITOR pin exceeds the I
duration exceeding approximately (1 ms), the IC disables the
internal MOSFET for the entire duration that the V pin current is
above I
pin exceeds the I
the IC will reinitiate the start-up sequence.
Brown-In Protection (I
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 (I
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 t
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
120
110
100
~2.5 V
90
80
70
60
50
40
30
20
10
~5 V
0
V(OFF)
V
IN
= 115 VAC
. In normal operation, if the current through the V
~140 VAC
V(OFF)
45
Line Conduction Angle (°C)
threshold for a duration exceeding t
UV+
UV-
)
PFS704-716
~170 VAC
)
100% Peak Load
75% Peak Load
50% Peak Load
25% Peak Load
PFS704-729EG
90
PI-5338-021711
V(OFF)
REFRESH
threshold for a
Expected Frequency
time period. In
135
Range at Peak
Rated Load
Rev. D 12/11
V(OFF)
7
,
180