TPS51217DSCR datasheet(4/27 Pages) TI

номер детали	TPS51217DSCR

подробное описание детали	HIGH PERFORMANCE, SINGLE SYNCHRONOUS STEP-DOWN CONTROLLER FOR NOTEBOOK POWER SUPPLY

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TPS51217

SLUS947 – JUNE 2009 ...................................................................................................................................................................................................... www.ti.com

ELECTRICAL CHARACTERISTICS (continued)

over recommended free-air temperature range, V5IN = 5V. (Unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

PROTECTION: CURRENT SENSE

TRIP source current

V(TRIP) = 1V, TA = 25°C

9

10

11

µA

I(TRIP)

TRIP current temperature

On the basis of 25°C

4700

ppm/°C

coefficient

Current limit threshold setting

V(TRIP)

V(TRIP-GND) Voltage

0.2

3

V

range

V(TRIP) = 3 V

355

375

395

VOCL

Current limit threshold

V(TRIP) = 1.6 V

185

200

215

mV

V(TRIP) = 0.2 V

17

25

33

V(TRIP) = 3 V

–395

–375

–355

VOCLN

Negative current limit threshold

V(TRIP) = 1.6 V

–215

–200

–185

mV

V(TRIP) = 0.2 V

–33

–25

–17

Positive

3

15

Auto zero cross adjustable

mV

range

Negative

–15

–3

PROTECTION: UVP AND OVP

V(OVP)

OVP trip threshold

OVP detect

115%

120%

125%

tOVPDEL

OVP propagation delay time

50-mV overdrive

1

µs

V(UVP)

Output UVP trip threshold

UVP detect

65%

70%

75%

tUVPDEL

Output UVP propagation delay

0.8

1

1.2

ms

tUVPEN

Output UVP enable delay time

From Enable to UVP workable

1

1.2

1.4

ms

UVLO

Wake up

4.20

4.38

4.50

V5IN UVLO threshold

V

Shutdown

3.7

3.93

4.1

THERMAL SHUTDOWN

Shutdown temperature (3)

145

TSDN

Thermal shutdown threshold

°C

Hysteresis(3)

10

(3)

Specified by design. Not production tested.

4

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