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| 型号： | LM5051MAEVAL/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 14/23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 |
SNVS702D – OCTOBER 2011 – REVISED MARCH 2013
Alternately, an external bias supply can be connected directly to the VCC pin, as long as the applied voltage is
below the minimum V Z breakdown voltage (11.9V) and above the minimum VCC operating voltage (4.50V). In
this case, it is important to pay close attention to the V GS rating of the external MOSFET as the gate drive voltage
will be affected by the lower voltage on the VCC pin.
R BIAS
LINE
LM5051
VCC
INN
GATE INP/VSS
Figure 30. Using an External Zener to Bias the VCC Pin
In the case where the OFF pin is high (i.e. OR-ing is disabled, and the Gate is discharged) and the voltage at the
INN pin is more negative than the V SD(REV) threshold voltage the internal current increases, and the voltage on
the VCC pin may drop.. Since the LM5051 is in the OFF state, this voltage drop does not affect any operation.
However, when the OFF pin is taken low to resume normal operation, the initial Gate charge time may be
extended slightly if the capacitor on the VCC pin has not had adequate time to fully recharge through either the
external R BIAS resistor, or through the internal 50 k ? resistor.
15
13
11
9
7
5
3
1
-1
VVCC
VGATE
VOFF
-2
0
2
4 6 8
10
12
14
TIME (ms)
Figure 31. V CC and V GATE vs V OFF , V INN = –100 mV
HIGH SIDE OR-ing
Because the INP and VSS functions are internally connected, the LM5051 cannot be configured as a High-Side
(i.e. Positive) OR-ing controller. Please refer to the LM5050-1 and LM5050-2 High-Side OR-ing controllers.
MOSFET FAILURE
Typically, the INN pin maximum negative voltage will be defined by the body diode of the external MOSFET. In
the even that the external MOSFET has a catastrophic failure that results in an open body diode, the voltage
between the INP/VSS pin and the INN pin may cause current through the LM5051 substrate diode at the INN
pin. The voltage at the INN pin must be limited to a safe level ( -1V) to prevent damage to the LM5051. The
voltage on the INN pin can be limited with the use of a Schottky diode and a current limiting resistor. Note that
the power dissipation of the current limiting resistor should allow for any anticipated worst case condition. See
14
Product Folder Links: LM5051
Copyright ? 2011–2013, Texas Instruments Incorporated
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