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| 型号： | LM5051MAEVAL/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 15/23页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR LM5051MA |
| 标准包装： | 1 |
| 主要目的： | 电源管理，O 环控制器/低压侧 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | LM5051 |
| 已供物品： | 板 |
LINE
LM5051
VCC
SNVS702D – OCTOBER 2011 – REVISED MARCH 2013
INN
GATE INP/VSS
1k
Figure 32. Protecting the INN Pin
SHORT CIRCUIT FAILURE OF AN INPUT SUPPLY
An abrupt zero ohm short circuit across the input supply will cause the highest possible reverse current to flow
while the internal LM5051 control circuitry discharges the gate of the MOSFET. During this time, the reverse
current is limited only by the R DS(ON) of the MOSFET, along with parasitic wiring resistances and inductances.
Worst case instantaneous reverse current would be limited to:
I D(REV) = (V OUT - V IN ) / R DS(ON)
(7)
The internal Reverse Comparator will react, and will start the process of discharging the Gate, when the reverse
current reaches:
I D(REV) = V SD(REV) / R DS(ON)
(8)
When the MOSFET is finally switched off, the energy stored in the parasitic wiring inductances will be transferred
to the rest of the circuit.
LINE
Shorted
LM5051 VCC
INN GATE INP/VSS
C OUT
C LOAD
Input
Parasitic
Inductance
Parasitic
Inductance
Figure 33. Input Supply Fault Transients
MOSFET SELECTION
The important MOSFET electrical parameters are the maximum continuous Drain current I D , the maximum
Source current (i.e. body diode), the maximum drain-to-source voltage V DS(MAX) , the gate-to-source threshold
voltage V GS(TH) , the drain-to-source reverse breakdown voltage V (BR)DSS , and the drain-to-source On resistance
R DS(ON) .
The maximum continuous drain current, I D , rating must be exceed the maximum continuous load current. The
rating for the maximum current through the body diode, I S , is typically rated the same as, or slightly higher than
the drain current, but body diode current only flows while the MOSFET gate is being charged to V GS(TH) :
Gate Charge Time = Q g / I GATE(ON)
(9)
The maximum drain-to-source voltage, V DS(MAX) , must be high enough to withstand the highest differential voltage
seen in the application. This would include any anticipated fault conditions.
The drain-to-source reverse breakdown voltage, V (BR)DSS , may provide some transient protection to the OUT pin
in low voltage applications by allowing conduction back to the IN pin during positive transients at the OUT pin.
The gate-to-source threshold voltage, V GS(TH) , should be compatible with the LM5051 gate drive capabilities.
Logic level MOSFETs are recommended, but sub-Logic level MOSFETs can also be used.
Copyright ? 2011–2013, Texas Instruments Incorporated
Product Folder Links: LM5051
15
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