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| 型号： | TPS51727RHARG4 |
| 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： | 16/42页 |
| 文件大小： | 0K |
| 代理商： | TPS51727RHARG4 |
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Overshoot Reduction (OSR) Feature
UDG-08008
+
10.8 V
–
12 V
L
–
1.2 V
+
1.2 V
C
www.ti.com ..................................................................................................................................................... SLUS806B – APRIL 2008 – REVISED JANUARY 2009
The problem of overshoot in low duty-cycle synchronous buck converters results from the output inductor having
a small voltage (VOUT) with which to respond to a transient load release.
In Figure 28, a single phase converter is shown for simplicity. In an ideal converter, with the common values of
12-V input and 1.2-V output, the inductor has 10.8 V (12 V – 1.2 V) to respond to a transient step, and 1.2 V to
respond once the load releases.
Figure 28. Synchronous Converter
Figure 29 shows a two-phase converter. The energy in the inductor is transferred to the capacitance on the VOUT
node above and the output voltage (green trace) overshoots the desired level (lower cursor, also green). In this
case, the magnitude of the overshoot is approximately –40 mV. The LLx waveforms (yellow and blue traces)
remain flat during the overshoot, indicating the DRVLx signals are on.
The performance of the same dual phase circuit, but with OSR enabled is shown in Figure 30. In this case, the
low side FETs shut off when overshoot is detected and the energy in the inductor is partially dissipated by the
body diodes. The overshoot is reduced by 20 mV. The dips in the LLx waveforms show the DRVLx signals are
OFF only long enough to reduce the overshoot.
Figure 29. CIrcuit Performance Without Overshoot
Figure 30. Transient Release Performance Improved with
Reduction
Overshoot Reduction
Copyright 2008–2009, Texas Instruments Incorporated
23
Product Folder Link(s): TPS51727
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