TPS1663 datasheet(15/30 Pages) TI1

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IMON

OUT

IMON

GAIN

VOUT

IIN

IMON

FLTb

TPS1663

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SLVSET9A – SEPTEMBER 2018 – REVISED OCTOBER 2018

Product Folder Links: TPS1663

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Feature Description (continued)

VIN = 50 V

RILIM = 18 kΩ

Figure 7. Output Hot-Short Response

The fast-trip comparator architecture has a supply line noise immunity resulting in a robust performance in noisy

environments. This is achieved by controlling the turn OFF time of the internal FET based on the over current

level, I(FASTTRIP) through the device. Higher the over current faster the turn OFF time, tFASTTRIP(dly).

8.3.7 Current Monitoring

The current source at IMON terminal is internally configured to be proportional to the current flowing from IN to

OUT. This current can be converted into a voltage using a resistor R(IMON) from IMON terminal to GND.;[

terminal. The IMON voltage can be used as a means of monitoring current flow through the system. The

maximum voltage range (V(IMONmax) for monitoring the current is limited to minimum of to ensure linear output.

This puts a limitation on maximum value of R(IMON) resistor and is determined by Equation 6.

Where,

•

GAIN(IMON) is the gain factor I(IMON):I(OUT) = 27.7μA/A (Typical)

•

I(OUT) is the load current

(6)

This pin must not have a bypass capacitor to avoid delay in the current monitoring information.

TPS1663 数据表(PDF) 15 Page - Texas Instruments