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| 型号： | TPS51727RHATG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封装： | 6 X 6 MM, GREEN, PLASTIC, QFN-40 |
| 文件页数： | 15/42页 |
| 文件大小： | 0K |
| 代理商： | TPS51727RHATG4 |
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SLUS806B – APRIL 2008 – REVISED JANUARY 2009 ..................................................................................................................................................... www.ti.com
If instead, I1 > I2, then an offset is subtracted from VDAC, and the pulse width for phase one is shortened,
reducing the current in phase one to compensate. If I1 < I2, then a longer pulse is produced, again compensating
on a pulse-by-pulse basis.
Because the increase in pulse width is proportional to the difference between the actual phase current and the
ideal current, the system converges smoothly to equilibrium. Because the filtering is so much lighter than
conventional current sharing schemes, the settling time is very fast. Analysis shows the response to be single
pole with a bandwidth in the tens of kHz depending on circuit parameters. Detailed analysis of the current
sharing circuit is available upon request.
The speed advantage allows the TPS51727 to quickly move from full speed to idle and back to save power when
processing light and moderate loads. A multi-phase converter that takes milliseconds to implement current
sharing will never be in equilibrium and thermal hot-spots can result. The TPS51727 allows rapid dynamic
current and output voltage changes while maintaining current balance.
22
Copyright 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): TPS51727
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