IRF7821 datasheet(5/33 Pages) TI

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TPS51123

www.ti.com ........................................................................................................................................................................................... SLUS890 – DECEMBER 2008

ELECTRICAL CHARACTERISTICS (continued)

over operating free-air temperature range, VIN = 12 V (unless otherwise noted)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNIT

PROTECTION: CURRENT SENSE

ITRIP

TRIPx source current

VTRIPx = 920 mV, TA= 25°C

9.4

10.6

µA

TRIPx current temperature

TCITRIP

On the basis of 25°C

4500

ppm/°C

coefficient

((VTRIPx-GND/9)-24 mV -VGND-LLx) voltage,

VOCLoff

OCP comparator offset

-8

VTRIPx-GND = 920 mV

VOCL(max) Maximum OCL setting

VTRIPx = 5 V

185

205

225

Zero cross detection

VZC

VGND-LLx voltage

-5

comparator offset

VTRIP

Current limit threshold

VTRIPx-GND voltage

(2)

0.515

PROTECTION: UNDERVOLTAGE AND OVERVOLTAGE PROTECTION

VOVP

OVP trip threshold

OVP detect

110%

115%

120%

TOVPDEL

OVP prop delay

µs

UVP detect

55%

60%

65%

VUVP

Output UVP trip threshold

Hysteresis

10%

TUVPDEL

Output UVP prop delay

µs

TUVPEN

Output UVP enable delay

1.4

2.6

UNDERVOLTAGE LOCKOUT (UVLO)

Wake up

4.1

4.2

4.3

VUVVREG5 VREG5 UVLO threshold

Hysteresis

0.38

0.43

0.48

VUVVREG3 VREG3 UVLO threshold

Shutdown (2)

VO2-1

THERMAL SHUTDOWN

Shutdown temperature (2)

150

TSDN

Thermal shutdown threshold

°C

Hysteresis (2)

(2)

Ensured by design. Not production tested.

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