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參數(shù)資料
| 型號： | Si786 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | Dual-Output Power-Supply Controller(用于便攜電腦電源轉(zhuǎn)換的雙輸出步降轉(zhuǎn)換器) |
| 中文描述： | 雙輸出電源控制器（用于便攜電腦電源轉(zhuǎn)換的雙輸出步降轉(zhuǎn)換器） |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 497K |
| 代理商： | SI786 |
Si786
Vishay Siliconix
S-60752—Rev. G, 05-Apr-99
10
FaxBack 408-970-5600, request 70189
www.siliconix.com
FIGURE 3.
Si786 Controller Block Diagram
Soft-Start
To slowly bring up the 3.3-V and 5-V supplies, connect
capacitors from SS
3
and SS
5
to GND. Asserting ON
3
or ON
5
starts a 4-μA constant current source to charge these
capacitors to 4 V. As the voltage on these pins ramps up, so
does the current limit comparator threshold, to increase the
duty cycle of the MOSFETs to their maximum level. If ON
3
or
ON
5
are left low, the respective capacitor is discharged to
GND. Leaving the SS
3
or SS
5
pins open will cause either
controller to reach the terminal over-current level within 10 μs.
Soft start helps prevent current spikes at turn-on and allows
separate
supplies
to
be
programmability.
delayed
using
external
Synchronous Rectifiers
Synchronous rectification replaces the Schottky rectifier with a
MOSFET, which can be controlled to increase the efficiency of
the circuit.
When the high-side MOSFET is switched off, the inductor will
try to maintain its current flow, inverting the inductor’s polarity.
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