參數(shù)資料
型號(hào): L6730BTR
廠商: 意法半導(dǎo)體
英文描述: Adjustable step-down controller with synchronous rectification
中文描述: 可調(diào)式降壓同步整流控制器
文件頁(yè)數(shù): 23/52頁(yè)
文件大?。?/td> 1370K
代理商: L6730BTR
L6730 - L6730B
Device description
23/52
There is an electrical network between the output terminal and the FB pin and therefore the
voltage at this pin is not a perfect replica of the output voltage. If the converter can sink current,
in the most of cases the low-side will be turned on before the output voltage exceeds the over-
voltage threshold because the error amplifier will throw off balance in advance.
Even if the device does not report an overvoltage event, the behavior is the same because the
low-side is turned on immediately. Instead, if the sink mode is disabled, the low-side will be
turned on only when the overvoltage protection (OVP) operates and not before because the
current can not be reversed. In this case, a delay between the output voltage rising and FB
voltage rising can appear and the OVP can turn on late.
Figure 16.
and
Figure 17.
show an
overvoltage event in the cases of the sink being enabled or disabled. The output voltage rises
with a slope of 100mV
μ
s, emulating the breaking of the high-side MOSFET as an overvoltage
occurs.
Figure 16. OVP with sink enabled: the low-side MOSFET is turned-on in advance.
Figure 17. OVP with sink disabled: delay on the OVP operation.
V
OUT
109%
V
FB
LGate
126%
V
OUT
V
FB
LGate
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