LT1641CS8 Ver la hoja de datos (PDF) - Linear Technology

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LT1641CS8

Positive High Voltage Hot Swap Controller

Linear Technology 

LT1641

PI FU CTIO S

SENSE (Pin 7): The Current Limit Sense Pin. A sense

resistor must be placed in the supply path between VCC

and SENSE. The current limit circuit will regulate the

voltage across the sense resistor (VCC – VSENSE) to 47mV

when VFB is 0.5V or higher. If VFB drops below 0.5V, the

voltage across the sense resistor decreases linearly and

stops at 12mV when VFB is 0V.

To defeat current limit, short the SENSE pin to the VCC pin.

VCC (Pin 8): The Positive Supply Input ranges from 9V to

80V for normal operation. ICC is typically 2mA. An internal

undervoltage lockout circuit disables the chip for inputs

less than 8.3V. Place a 0.1µF bypass capacitor next to the

VCC pin.

BLOCK DIAGRA

VCC

VP

VP GEN

FB

+

REF GEN 0.5V –

1.233V

+

ON

–

SENSE

–

12mV ~ 47mV

+

+

1.233V –

CHARGE

PUMP

AND

GATE

DRIVER

GATE

PWRGD

VCC

–

UNDERVOLTAGE LOCKOUT

8.3V

+

LOGIC

0.5V

+

–

+

1.233V –

VP

80µA

TIMER

4

3µA

GND

1641 BD

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