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Product Top View

Pin Assignments

Pin

Function

1

–Vout

2

Vout Adj

3

+Vout

4

Input Ref

5

Detect A

6

Detect B

7

Spare Line B

8

Spare Line A

9

Data Line B

10

Data Line A

11

Class B

12

Class A

13

Output Inhibit *

Shaded functions indicate signals

electrically common with the input.

* Denotes negative logic:

Open = Normal operation

Low (Input Ref) = Output Off

Description

The PTB48540 series of power mod-

ules is specifically designed to provide

an isolated, low-voltage power source to

a remote Powered Device (PD) in Power-

Over-Ethernet (PoE) applications. These

modules are rated 10 W and incorporate

all the necessary interface requirements

to comply with IEEE Std. 802.3af, for

managing the input power to the PD from

the PoE Power Sourcing Equipment

(PSE). This includes PD detection and

PD classification current signatures

required for the PSE. The modules are

compatible with PD classifications, class 0

through class 3.

In addition to a fully integrated DC/DC

converter, each PTB48540 power module

incorporates internal input diode bridges

to support both Data Line and Spare Line

pair standard Ethernet power connec-

tions, an integral transient suppressor

for input over-voltage protection, and

an EMI filter to ensure noise compat-

ibility with Ethernet data signals.

Other features include an input under-

voltage lockout (UVLO), over-current

and short-circuit protection, an output

voltage adjust/trim, and over-temperature

protection. An “Output Inhibit” control

allows the output voltage to be turned

off to support an idle condition or power

saving mode. The output voltage options

are for 3.3-V, 5-V, or 12-V output. The

target applications are small low-power

remote IP appliances, such as security card

readers and cameras, test dongles, and IP

phone consoles.

Features

36 V to 57 V

(for PoE-PD Interface)

PTB48540 Series

10-W Power-Over-Ethernet Isolated

Power Module Assembly

SLTS224B – APRIL 2004 – REVISED JULY 2004

Class A Conducted

UL 60950, cUL 60950, EN60950

1

2

3

4

5

6

7

8

9

10

11

12

13

Spare Line A

Data Line B

Data Line A

PoE-PD

Interface Switch

(TPS2375)

EMI

Filter

Transient

Suppression

Data/Spare Line

Bridge Rectifiers

DC/DC

Converter

Spare Line B

Not Recommended for New Designs