PKS607FN Power Integrations, PKS607FN Datasheet - Page 7

• Manufacturer Part Number: PKS607FN
• Description: IC OFFLINE SWIT OTP OCP HV TO262
• Manufacturer: Power Integrations
• Series: PeakSwitch®r

Specifications of PKS607FN

• Output Isolation: Isolated
• Frequency Range: 250 ~ 304kHz
• Voltage - Output: 700V
• Power (watts): 126W
• Operating Temperature: -40°C ~ 150°C
• Package / Case: TO-262-7 (Formed Leads), 5 Leads
• Input / Supply Voltage (max): 265 VAC
• Input / Supply Voltage (min): 85 VAC
• Duty Cycle (max): 68 %
• Switching Frequency: 277 kHz
• Supply Current: 1430 uA
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: Through Hole
• For Use With: 596-1267 - KIT REF DESIGN PEAKSWITCH
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 596-1140-5

200
100
At maximum peak load, PeakSwitch will conduct during nearly
all of its clock cycles (Figure 7). At the rated continuous load,
it will “skip” additional cycles in order to maintain voltage
regulation at the power supply output (Figure 8). At medium
loads, cycles will be skipped and the current limit will be
reduced (Figure 9). At very light loads, the current limit will
be reduced even further (Figure 10). Only a small percentage
of cycles will occur to satisfy the internal power consumption
of the power supply at no-load.
The response time of the ON/OFF control scheme is very
fast compared to normal PWM control. This provides
tight regulation and excellent transient response.
200
100
Figure 12. PeakSwitch Power Up Without Optional External UV
400
300
200
100
300
200
100
Figure 13. Normal Power Down Timing (Without UV).
0
0
0
5
0
0
0
0
Resistor Connected to EN/UV Pin.
V
DC-INPUT
V
V
BYPASS
DRAIN
Modifying current schematic
Time (ms)
Time (s)
.5
5
V
V
DC-INPUT
DRAIN
10
1
Power Up/Down
The PeakSwitch requires only a 0.33 µF capacitor on the
BYPASS pin. Because of its small size, the time to charge this
capacitor is kept to an absolute minimum, typically less than
1.5 ms. Due to the fast nature of the ON/OFF feedback, there
is no overshoot at the power supply output. When an external
resistor is connected from the positive DC input to the EN/UV
pin, the power MOSFET switching will be delayed during power
up until the DC line voltage exceeds the threshold (100 V).
Figures 11 and 12 show the power up timing waveform in
applications with and without an external resistor (4 MW)
connected to the EN/UV pin.
During power down, when an external resistor is used, the
power MOSFET will switch for 30 ms after the output loses
regulation. The power MOSFET will then remain off without
any glitches since the under-voltage function prohibits restart
when the line voltage is low.
Figure 13 illustrates a typical power-down timing waveform.
Figure 14 illustrates a very slow power-down timing waveform
as in standby applications. An external resistor is connected to
the EN/UV pin in this case to prevent unwanted restarts.
Current Limit Operation
Each switching cycle is terminated when the DRAIN current
reaches the current limit of the PeakSwitch. Current limit
operation provides good line ripple rejection.
BYPASS Pin Capacitor
The BYPASS pin uses a small 0.33 uF ceramic capacitor for
decoupling the internal power supply.
Figure 14. Slow Power Down Timing With Optional External
200
100
400
300
200
100
0
0
0
(4 MW) UV Resistor Connected to EN/UV Pin.
Time (s)
2.5
PKS603-607
V
DC-INPUT
V
DRAIN
Rev. I 02/07
7
5