PTB48540 Series
10-W Power-Over-Ethernet Isolated
Power Module Assembly
SLTS224B – APRIL 2004 – REVISED JULY 2004
Features
• Input Voltage Range:
36 V to 57 V
• 10 W Output
• IEEE Std. 802.3af Compliant
(for PoE-PD Interface)
• 85 % Efficiency
• Low Profile (9 mm)
• Output Voltage Trim/Adjust
• Under-Voltage Lockout
• Input Transient Suppressor
• Internal EMI Filter
• Meets FCC Class B Radiated &
Class A Conducted
• Output Inhibit Control
• Short Circuit Protection
• Over Temperature Shutdown
• 1500 VDC Isolation
• Safety Approvals (Pending):
UL 60950, cUL 60950, EN60950
Description
Pin Assignments
The PTB48540 series of power modules is specifically designed to provide
an isolated, low-voltage power source to
a remote Powered Device (PD) in PowerOver-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 connections, an integral transient suppressor
for input over-voltage protection, and
an EMI filter to ensure noise compatibility with Ethernet data signals.
Other features include an input undervoltage 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.
Output Inhibit
Class A
Class B
Product Top View
13
12
11
PoE-PD
Interface Switch
(TPS2375)
Data Line A
9
Data Line B
8
Spare Line A
Data/Spare Line
Bridge Rectifiers
1
10
Transient
Suppression
–VOUT
7
Spare Line B
EMI
Filter
DC/DC
Converter
4
For technical support and further information visit http://power.ti.com
5
6
Detect B
3
Input Ref
+VOUT
2
Detect A
VOUT Adj
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
Function
–Vout
Vout Adj
+Vout
Input Ref
Detect A
Detect B
Spare Line B
Spare Line A
Data Line B
Data Line A
Class B
Class A
Output Inhibit *
Shaded functions indicate signals
electrically common with the input.
* Denotes negative logic:
Open = Normal operation
Low (Input Ref) = Output Off
