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AN701 Datasheet(PDF) 13 Page - Vishay Siliconix

Part No. AN701
Description  reduce the size of energy storage components
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Maker  VISHAY [Vishay Siliconix]
Homepage  http://www.vishay.com
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AN701 Datasheet(HTML) 13 Page - Vishay Siliconix

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AN701
Vishay Siliconix
Document Number: 70575
16-Jan-01
www.vishay.com
13
Figure 23 Time Base 500 ns/div.
➀ VDS of MOSFET 50 V/div
➁ Voltage across sense resistor 1 V/div
➂ Voltage across gate 5 V/div
Figure 24 Time Base 500 ns/div.
➀ VDS of MOSFET 50 V/div
➁ Output ripple 10 mV/div
Figure 25 Time Base 200 ms/div.
➀ Output transient response for 1.5 to 3 A.
Figure 26 Time Base 5
ms/div.
➀ Output transient response for 1.5 to 3 A.
Figure 27 Si9114A 15-W, 500-kHz Converter Efficiency
90
80
70
60
0
2
4
6
8
10
100
Output Power (W)
12
14
16
18
In Figure 24, the low output ripple (<20 mV) is obtained with two
10-
mF capacitors.1 In Figure 26, note the excellent recovery
time of <25
ms to within 1% of output for a 50% load step with
total excursion of <300 mV. The efficiency of the converter is
measured in Figure 27.
BENEFITS OF USING SI9114A
Low power consumption
at 500 kHz, the Si9114A consumes only 8 mA from the 12-V
supply. This amounts to a total of 96 mW or 5.6% of the losses.
It is important to remember that this figure represents both the
power MOSFET losses as well as the control circuit. The
control circuit was measured to consume only 3.2 mA or 2% of
the total losses. In comparison, typical bipolar circuits would
consume 35 mA, or 21% of the losses.
Short delay times:
with typical delay time approaching 65 ns, short circuit current
can be lowered, and operation at higher frequencies is
possible.


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