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TNY263-268
200
V
EN
100
V
DC-INPUT
CLOCK
0
10
D
MAX
5
V
BYPASS
0
I DRAIN
400
200
V
DRAIN
0
0
1
Time (ms)
2
V DRAIN
PI-2661-072400
Figure 11. TinySwitch-II Power-up without Optional External UV
Resistor Connected to EN/UV Pin.
Figure 9.
TinySwitch-II Operation at Very Light Load.
200
two main bene?ts. First, for a nominal application, this
eliminates the cost of a bias winding and associated
components. Secondly, for battery charger applications, the
current-voltage characteristic often allows the output voltage
to fall close to zero volts while still delivering power. This type
of application normally requires a forward-bias winding which
100
0
400
300
V
DC-INPUT
has many more associated components. With TinySwitch-II,
neither are necessary. For applications that require a very low
200
V
DRAIN
no-load power consumption (50 mW), a resistor from a bias
winding to the BYPASS pin can provide the power to the chip.
100
The minimum recommended current supplied is 750 μ A. The
BYPASS pin in this case will be clamped at 6.3 V. This method
0
0
.5
1
will eliminate the power draw from the DRAIN pin, thereby
Time (s)
Figure 12. Normal Power-down Timing (without UV).
200
100
V
DC-INPUT
200
0
100
V
DC-INPUT
10
0
5
V
BYPASS
400
0
300
400
200
V
DRAIN
200
V
DRAIN
100
0
0
0
1
2
0
2.5
5
Time (ms)
Figure 10. TinySwitch-II Power-up with Optional External UV
Resistor (2 M Ω ) Connected to EN/UV Pin.
6
Rev. H 02/09
Time (s)
Figure 13. Slow Power-down Timing with Optional External
(2 M Ω ) UV Resistor Connected to EN/UV Pin.
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