TNY274PG データシートの表示（PDF） - Power Integrations, Inc
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TNY274PG Datasheet PDF : 24 Pages
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TNY274-280
VEN
CLOCK
DCMAX
IDRAIN
VDRAIN
Figure 9. Operation at Very Light Load.
PI-2661-082305
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.
200
100
V
DC-INPUT
0
10
5
V
BYPASS
0
400
200
V
DRAIN
0
0
1
2
Time (ms)
Figure 10. Power-Up with Optional External UV Resistor (4 MΩ)
Connected to EN/UV Pin.
6
E
2/06
200
100
V
DC-INPUT
0
10
5
V
BYPASS
0
400
200
V
DRAIN
0
0
1
2
Time (ms)
Figure 11. Power-Up Without Optional External UV Resistor
Connected to EN/UV Pin.
200
V
100
DC-INPUT
0
400
300
200
V
DRAIN
100
0
0
.5
1
Time (s)
Figure 12. Normal Power-Down Timing (without UV).
200
100
V
DC-INPUT
0
400
300
200
V
DRAIN
100
0
0
2.5
5
Time (s)
Figure 13. Slow Power-Down Timing with Optional External
(4 MΩ) UV Resistor Connected to EN/UV Pin.
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