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TNY274-280 Datasheet(PDF) 6 Page - Power Integrations, Inc.

Part # TNY274-280
Description  Energy-Efficient, Off-Line Switcher with Enhanced Flexibility and Extended Power Range
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Manufacturer  POWERINT [Power Integrations, Inc.]
Direct Link  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

TNY274-280 Datasheet(HTML) 6 Page - Power Integrations, Inc.

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Rev. N 12/21
6
TNY274-280
www.power.com
Figure 12. Normal Power Down Timing (without UV).
Figure 13. Slow Power Down Timing with Optional External (4 M
W) UV Resistor
Connected to EN/UV Pin.
Figure 10. Power Up with Optional External UV Resistor (4 M
W)
Connected to EN/UV Pin.
Figure 11. Power Up Without Optional External UV Resistor Connected to
EN/UV Pin.
0
2.5
5
Time (s)
0
100
200
400
300
0
100
200
VDC-INPUT
VDRAIN
0
12
Time (ms)
0
200
400
5
0
10
0
100
200
V
DC-INPUT
V
BYPASS
V
DRAIN
0
1
2
Time (ms)
0
200
400
5
0
10
0
100
200
VDC-INPUT
VBYPASS
VDRAIN
0
.5
1
Time (s)
0
100
200
300
0
100
200
400
VDC-INPUT
VDRAIN
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, cycles
will be skipped and the current limit will be reduced (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.


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