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| 型號(hào)： | L6732CTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | HTSSOP-16 |
| 文件頁數(shù)： | 7/32頁 |
| 文件大?。?/td> | 905K |
| 代理商： | L6732CTR |
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L6732C
5 Device description
15/32
5.8
Monitoring and protections
The output voltage is monitored by means of pin FB. If it is not within ±10% (typ.) of the
programmed value, the Power-Good (PGOOD) output is forced low.
The device provides over-voltage-protection: when the voltage sensed on FB pin reaches a
value 20% (typ.) greater than the reference, the low-side driver is turned on as long as the over
voltage is detected (see Figure 7.).
It must be taken into account that there is an electrical network between the output terminal and
the FB pin and therefore the voltage at the pin is not a perfect replica of the output voltage.
However due to the fact that the converter can sink current, in the most of cases the low-side
will turn-on before the output voltage exceeds the over-voltage threshold, because the error
amplifier will throw off balance in advance. Even if the device doesn't report an over-voltage,
the behavior is the same, because the low-side is turned-on immediately. The following figure
shows the device behavior during an over-voltage event. The output voltage rises with a slope
of 100mV/s, emulating in this way the breaking of the high-side MOSFET as an over-voltage
cause.
Figure 7.
OVP
LGate
FB
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