TPS23753APWR datasheet(5/30 Pages) TI1

No. de pieza	TPS23753APWR

Descripción Electrónicos	IEEE 802.3 PoE INTERFACE AND CONVERTER CONTROLLER WITH ENHANCED ESD IMMUNITY

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Fabricante Electrónico	TI1 [Texas Instruments]

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GATE

RTN

VC

CS

VDD

VSS

DEN

BLNK

FRS

VB

CTL

CLS

1

2

3

4

5

6

7

8

14

13

11

10

9

12

APD

VDD1

TPS23753A

www.ti.com

SLVS933B – JULY 2009 – REVISED JANUARY 2010

ELECTRICAL CHARACTERISTICS (continued)

PoE and Control

[VDD = VDD1] or [VDD1 = RTN], VVC-RTN = 0 V, all voltages referred to VSS. Typical specifications are at 25°C.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

THERMAL SHUTDOWN

Turn off temperature

135

145

155

°C

Hysteresis(2)

20

°C

(2)

These parameters are provided for reference only.

DEVICE INFORMATION

TOP VIEW

Table 1. Terminal Functions

TERMINAL

I/O

DESCRIPTION

NO.

NAME

1

CTL

I

The control loop input to the PWM (pulse width modulator). Use VB as a pull up for CTL.

5 V bias rail for dc/dc control circuits. Apply a 0.1 mF to RTN. VB may be used to bias an external

2

VB

O

optocoupler for feedback.

Dc/dc converter switching MOSFET current sense input. Connect CS to the high side of RCS per

3

CS

I

Figure 1.

Dc/dc converter bias voltage. The internal startup current source and converter bias winding output

4

VC

I/O

power this pin. Connect a 0.22 mF minimum ceramic capacitor to RTN, and a larger capacitor to

facilitate startup.

5

GATE

O

Gate drive output for the dc/dc converter switching MOSFET.

6

RTN

RTN is the negative rail input to the dc/dc converter and output of the PoE hotswap.

7

VSS

Negative power rail derived from the PoE source.

8

VDD1

Source of dc/dc converter startup current. Connect to VDD for most applications.

9

VDD

Positive input power rail for PoE interface circuit. Derived from the PoE source.

Connect a 24.9 k

Ω resistor from DEN to VDD to provide the PoE detection signature. Pulling this pin

10

DEN

I/O

to VSS during powered operation causes the internal hotswap MOSFET to turn off.

11

CLS

O

Connect a resistor from CLS to VSS to program the classification current per Table 2.

Pull APD above 1.5 V to disable the internal PD hotswap switch, forcing power to come from an

12

APD

I

external adapter. Connect to the adapter through a resistor divider.

Connect to RTN to utilize the internally set blanking period or connect through a resistor to RTN to

13

BLNK

I/O

program the blanking period.

14

FRS

I/O

Connect a resistor from FRS to RTN to program the converter switching frequency.

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