AN701 datasheet(13/19 Pages) VISHAY

13 / 19 page

AN701

Vishay Siliconix

Document Number: 70575

16-Jan-01

www.vishay.com

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

➀

➁

➂

Figure 24 Time Base 500 ns/div.

➀ VDS of MOSFET 50 V/div

➁ Output ripple 10 mV/div

➀

➁

Figure 25 Time Base 200 ms/div.

➀ Output transient response for 1.5 to 3 A.

➀

Figure 26 Time Base 5

ms/div.

➀ Output transient response for 1.5 to 3 A.

➀

Figure 27 Si9114A 15-W, 500-kHz Converter Efficiency

100

Output Power (W)

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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