TNY263-268
200
100
V
EN
V
DC-INPUT
0
CLOCK
10
D
MAX
V
5
0
BYPASS
I
DRAIN
400
200
0
V
DRAIN
1
2
0
Time (ms)
V
DRAIN
Figure 11. TinySwitch-II Power-up without Optional External UV
Resistor Connected to EN/UV Pin.
PI-2661-072400
200
Figure 9. TinySwitch-II Operation at Very Light Load.
V
100
0
DC-INPUT
During power-down, when an external resistor is used, the
power MOSFET will switch for 50 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.
400
300
V
200
100
0
DRAIN
Figure 12 illustrates a typical power-down timing waveform of
TinySwitch-II. Figure 13 illustrates a very slow power-down
timing waveform of TinySwitch-II as in standby applications.
The external resistor (2 MΩ) is connected to the EN/UV pin
in this case to prevent unwanted restarts.
.5
1
0
Time (s)
Figure 12. Normal Power-down Timing (without UV).
200
V
100
200
DC-INPUT
V
0
100
0
DC-INPUT
10
V
5
400
300
BYPASS
0
V
400
200
100
0
DRAIN
200
V
DRAIN
0
1
2
2.5
5
0
0
Time (s)
Time (ms)
Figure 13. Slow Power-down Timing with Optional External
Figure 10. TinySwitch-II Power-up with Optional External UV
(2 MΩ) UV Resistor Connected to EN/UV Pin.
Resistor (2 MΩ) Connected to EN/UV Pin.
G
4/05
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POWERINT [ Power Integrations ]
