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TNY274P Datasheet(PDF) 6 Page - Power Integrations, Inc.

Part # TNY274P
Description  Energy Efficient, Off-Line Switcher with Enhanced Flexibility and Extended Power Range
Download  24 Pages
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Manufacturer  POWERINT [Power Integrations, Inc.]
Direct Link  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

TNY274P Datasheet(HTML) 6 Page - Power Integrations, Inc.

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6 E2/06
TNY274-280
Figure 12. Normal Power-Down Timing (without UV).
Figure 13. Slow Power-Down Timing with Optional External
(4 MΩ) UV Resistor Connected to EN/UV Pin.
Figure 10. Power-Up with Optional External UV Resistor (4 MΩ)
Connected to EN/UV Pin.
Figure 11. Power-Up Without Optional External UV Resistor
Connected to EN/UV Pin.
PI-2661-082305
V
DRAIN
V
EN
CLOCK
DC
DRAIN
I
MAX
Figure 9. Operation at Very Light Load.
At near maximum load, TinySwitch-III will conduct during
nearly all of its clock cycles (Figure 6). At slightly lower load,
it will “skip” additional cycles in order to maintain voltage
regulation at the power supply output (Figure 7). At medium
loads,cycleswillbeskippedandthecurrentlimitwillbereduced
(Figure 8).At very light loads, the current limit will be reduced
even further (Figure 9). Only a small percentage of cycles will
occur to satisfy the power consumption of the power supply.
The response time of the ON/OFF control scheme is very fast
compared to PWM control. This provides tight regulation and
excellent transient response.
0
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Time (s)
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300
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200
V
DC-INPUT
V
DRAIN
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Time (ms)
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400
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0
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200
V
DC-INPUT
V
BYPASS
V
DRAIN
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Time (ms)
0
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400
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0
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0
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200
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DC-INPUT
V
BYPASS
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DRAIN
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.5
1
Time (s)
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DC-INPUT
V
DRAIN


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