PKS604PN Power Integrations, PKS604PN Datasheet - Page 15

• Manufacturer Part Number: PKS604PN
• Description: IC OFFLINE SWIT OTP OCP HV 8DIP
• Manufacturer: Power Integrations
• Series: PeakSwitch®r

Specifications of PKS604PN

• Mfg Application Notes: PeakSwitch Design Guide AppNote
• Output Isolation: Isolated
• Frequency Range: 250 ~ 304kHz
• Voltage - Output: 700V
• Power (watts): 56W
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 8-DIP (0.300", 7.62mm), 7 Leads
• Output Voltage: 12 V
• Input / Supply Voltage (max): 265 VAC
• Input / Supply Voltage (min): 85 VAC
• Duty Cycle (max): 65 %
• Switching Frequency: 47 KHz
• Supply Current: 25 uA
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: Through Hole
• For Use With: 596-1126 - KIT DESIGN ACC PEAKSWITCH FAMILY
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 596-1117-5

Figure 16. Effect of On-Time Extension Operation During Line Brown-Out. (A) Without On-Time Extension Regulation is Lost. (B) With
If the EN/UV pin has not been pulled low for 750 µs to
1.2 ms and every enabled switching cycle has terminated
because DMAX was reached (instead of current limit), the on-
time extension function is enabled. The maximum duty cycle
limit is then disabled and switching cycles are terminated by
current limit alone. Therefore, the MOSFET on time is only
determined by the time for the primary current to reach current
limit. The off time of the MOSFET remains fixed at (1-D
1/f
frequency. Once the EN/UV pin has been pulled low, indicating
the output is again in regulation, on-time extension is disabled,
and the MOSFET on time is terminated either by current limit
or maximum duty cycle.
Since on-time extension is only enabled after the EN/UV pin
has not been pulled low for up to 1.2 ms, the output may also
have been out of regulation for that duration. Therefore, verify
that the output voltage ripple is acceptable during instances of
on-time extension.
Other Information
Adaptive Current Limit
PeakSwitch incorporates an adaptive current limit function.
When the current-limit state machine has the current limit set
to 100% and an enabled switching cycle that follows a disabled
switching cycle reaches current limit before DMAX, the adaptive
current limit function reduces the current limit by about 10%.
Once a cycle is skipped, the current limit is returned to the 100%
value. This simplifies compliance with power limited source
safety testing by limiting the overload power at high line.
S
, where D
(A)
On-Time Regulation is Maintained.
MAX
is the maximum duty cycle and f
S
the switching
MAX
(B)
) ×
Layout Guidelines
See data sheet for layout guidelines.
Quick Design Checklist
See data sheet for quick design checklist.
Figure 17. Example of Adaptive Current Limit.
I
DRAIN
0.5 A/div
10%
AN-41
All 50 ms/div
V
I
V
DRAIN
AC
OUT
(350 V/div)
(15 V/div)
(2 A/div)
5 µs/div
Rev. E 02/07
15