NIS5102 Просмотр технического описания (PDF) - ON Semiconductor

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NIS5102

High Side SMART HotPlug IC/Inrush Limiter/Circuit Breaker

ON Semiconductor 

NIS5102

VCC

RUVLO

400 k

UVLO

VGS(th) = 1.15 V

40 k

Source

Current

Limit

3k

Ground

Figure 20. Equivalent Undervoltage Lockout Circuit

The theoretical equation for the UVLO turn-on voltage is:

RUVLOĂ(KW)

+

400ĂVin * 460

17.5 * Vin

The UVLO trip point voltage calculated through the

theoretical formula may show small variations with respect

to Figure 3, therefore it is recommended to use the formulas

gotten from the UVLO characterization, which are shown

below:

RUVLOĂ(kW) + eĂ[(UVLO ) 14.647)ń3.9858]; for TJ + 25°C

where “UVLO” is the desired undervoltage lockout value,

and RUVLO is the programming resistor from the UVLO pin

to the VCC pin.

To reduce nuisance tripping due to transients and noise

spikes, a capacitor may be added from the UVLO pin to

ground. This will create a low pass filter with a cutoff

frequency of f. The required capacitance on this pin is:

ƪ ǒ Ǔƫ CUVLO

+

2pĂ·ĂfĂ

1

43ĂK )

RUVLOĂ·Ă400ĂK

RUVLO)400ĂK

Overvoltage Lockout and Parallel Shutdown

The overvoltage lockout (OVLO) is a dual function pin.

This pin will normally be biased somewhere between

ground and the input voltage, due to an internal voltage

divider which sets the turn-off voltage level at 22 V. This

voltage level can be reduced by adding an external resistor

from the OVLO pin to the VCC pin. When the input voltage

reaches the programmed trip point, operation of the device

is inhibited.

Figure 21 shows the equivalent circuit.

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