TPS2370PW datasheet(6/19 Pages) TI1

Part #	TPS2370PW

Description	IEEE 802.3af POWER INTERFACE SWITCH FOR POWER OVER ETHERNET(PoE) POWERED DEVICES

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Manufacturer	TI1 [Texas Instruments]

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TPS2370

SLUS537C − AUGUST 2002 − REVISED MARCH 2004

www.ti.com

6

STATE DIAGRAM

YES

NO

YES

NO

DETECTION

VDD < 10 V

IDD = VDD/(RDET) || 1 MΩ

Switch Resistance > 100 M

Ω

CLASSIFICATION

10 V < VDD < 22 V

IDD ≅ 10 V/(RCLASS)

Switch Resistance > 100 M

Ω

INRUSH MODE

VDD > 40 V (rising edge)

VRTN > 1.5 V

IRET = IINRUSH = 450 mA − (25 kΩ/RLIM) x (1 A)

Switch Resistance

≈ 100 Ω

NORMAL OPERATION

VDD > 30 V

(IRET = ILOAD) < 450 mA

Switch Resistance

≈ 0.3 Ω

OVERLOAD/FAULT

VDD > 30 V

IRET = 450 mA

Switch Resistance

≈ 100 Ω

TJ < 145 _C?

THERMAL SHUTDOWN

VDD > 30 V

IDD < 1 mA

Switch Resistance > 100 M

Ω

TSD

Count < 7?

LATCH OFF

VDD > 30 V

IDD < 1 mA

Switch Resistance

> 100 MΩ

MACHINE STATE

0

50

Classification

(Falling Edge)

44

57

UVLO ON

(Rising Edge)

2

4

6

8

10

15

20

31

25

40

UVLO OFF

Detection

(RLOAD =25kΩ)

Normal Operation

(IDD = 450 mA)

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