TPS23785BPWP datasheet(5/47 Pages) TI

Part #	TPS23785BPWP

Description	High-Power, High-Efficiency PoE PD and DC-to-DC Controller

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Manufacturer	TI [Texas Instruments]

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TPS23785B

www.ti.com

SLUSB90A – DECEMBER 2012 – REVISED DECEMBER 2012

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

CS

VCSMAX

Maximum threshold voltage

VCTL = VB, VCS rising until GATE duty cycle drops

0.5

0.55

0.6

V

t1

Turnoff delay

VCS = 0.65 V

24

40

70

ns

Peak voltage at maximum duty cycle, referenced

VSLOPE

Internal slope compensation voltage

120

155

185

mV

to CS

ISL_EX

Peak slope compensation current

VCTL = VB, ICS at maximum duty cycle

30

42

54

μA

Bias current (sourcing)

DC component of ICS

1

2.5

4.3

GATE

VCTL = VB, VC = 12 V, GATE high, pulsed

Source current

0.37

0.6

0.95

measurement

A

VCTL = VB, VC = 12 V, GATE low, pulsed

Sink current

0.7

1

1.4

measurement

GAT2

VCTL = VB, VC = 12 V, GAT2 high, RDT = 24.9 kΩ,

Source current

0.37

0.6

0.95

pulsed measurement

A

VCTL = VB, VC = 12 V, GAT2 low, RDT = 24.9 kΩ,

Sink current

0.7

1

1.4

pulsed measurement

APD

VAPDEN

VAPD rising

1.43

1.5

1.57

APD threshold voltage

V

VAPDH

Hysteresis (2)

0.29

0.31

0.33

APD leakage current

VC = 12 V, VAPD = VB

1

μA

(source or sink)

P1, P2

Leakage current

Source or sink

1

μA

(2)

The hysteresis tolerance tracks the rising threshold for a given device.

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