Datasheet

6
G
4/05
TNY263-268
Figure 12. Normal Power-down Timing (without UV).
Figure 13. Slow Power-down Timing with Optional External
(2 M
Ω) UV Resistor Connected to EN/UV Pin.
Figure 10. TinySwitch-II Power-up with Optional External UV
Resistor (2 MΩ) Connected to EN/UV Pin.
Figure 11. TinySwitch-II Power-up without Optional External UV
Resistor Connected to EN/UV Pin.
PI-2661-072400
V
DRAIN
V
EN
CLOCK
D
DRAIN
I
MAX
Figure 9. TinySwitch-II Operation at Very Light Load.
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.
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 M
Ω) is connected to the EN/UV pin
in this case to prevent unwanted restarts.
PI-2395-030801
0
2.5 5
Time (s)
0
100
200
400
300
0
100
200
V
DC-INPUT
V
DRAIN
0
1 2
Time (ms)
0
200
400
5
0
10
0
100
200
PI-2383-030801
V
DC-INPUT
V
BYPASS
V
DRAIN
PI-2381-1030801
0
1 2
Time (ms)
0
200
400
5
0
10
0
100
200
V
DC-INPUT
V
BYPASS
V
DRAIN
PI-2348-030801
0
.5 1
Time (s)
0
100
200
300
0
100
200
400
V
DC-INPUT
V
DRAIN