LP5952TLX-0.7SLASHNOPB datasheet(12/29 Pages) TI1

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OUT

GATE

1.5V

OFF

GND

LM5050- 1

Reverse

Comparator

LOAD

INPUT

35 µA

14V

30 mV

30 µA

30 mV

5 µA

Bias

Circuitry

MOSFET Off

+12V Charge

Pump

LM5050-1, LM5050-1-Q1

SNVS629E – MAY 2011 – REVISED DECEMBER 2015

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7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 IN, GATE, and OUT Pins

When power is initially applied, the load current will flow from source to drain through the body diode of the

MOSFET. Once the voltage across the body diode exceeds VSD(REG) then the LM5050-1 begins charging the

MOSFET gate through a 32 µA (typical) charge pump current source . In forward operation, the gate of the

MOSFET is charged until it reaches the clamping voltage of the 12-V GATE to IN pin Zener diode internal to the

LM5050-1.

The LM5050-1 is designed to regulate the MOSFET gate-to-source voltage. If the MOSFET current decreases to

the point that the voltage across the MOSFET falls below the VSD(REG) voltage regulation point of 22 mV (typical),

the GATE pin voltage will be decreased until the voltage across the MOSFET is regulated at 22 mV. If the

source-to-drain voltage is greater than the VSD(REG) voltage, the gate-to-source voltage will increase and

eventually reach the 12-V GATE to IN pin Zener clamp level.

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Product Folder Links: LM5050-1 LM5050-1-Q1

LP5952TLX-0.7/NOPB bảng dữ liệu(PDF) 12 Page - Texas Instruments