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參數(shù)資料
| 型號： | AN701 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | Designing High-Frequency DC-to-DC Converters With the Si9114A Switchmode Controller |
| 中文描述： | 設計高頻型DC - DC轉(zhuǎn)換器隨著Si9114A開關(guān)模式控制器 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大小： | 1113K |
| 代理商： | AN701 |
AN701
Vishay Siliconix
Document Number: 70575
16-Jan-01
www.vishay.com
13
Figure 23
Time Base 500 ns/div.
V
DS
of MOSFET 50 V/div
Voltage across sense resistor 1 V/div
Voltage across gate 5 V/div
Figure 24
Time Base 500 ns/div.
V
DS
of MOSFET 50 V/div
Output ripple 10 mV/div
Figure 25
Time Base 200 ms/div.
Output transient response for 1.5 to 3 A.
Figure 26
Time Base 5 s/div.
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
E
Output Power (W)
12
14
16
18
In Figure 24, the low output ripple (<20 mV) is obtained with two
10- F capacitors.
1
In Figure 26, note the excellent recovery
time of <25 s 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.
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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