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AS1138 Datasheet(PDF) 20 Page - List of Unclassifed Manufacturers

Part # AS1138
Description  30W PoE PD and DC-DC Controller
PDF  30 Pages
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Manufacturer  ETC2 [List of Unclassifed Manufacturers]
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AS1138 Datasheet(HTML) 20 Page - List of Unclassifed Manufacturers

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AS1138
Akros Silicon, Inc.
6399 San Ignacio Avenue, Suite 250, San Jose, CA 95119 USA
408.746.9000
www.AkrosSilicon.com
20
Local power is inserted at the VDD48O node through an
external diode (D2). Use of a low reverse-leakage diode is
recommended (<350uA, at worst case temperature). This
ensures that when there is no local power, PoE voltage at
the VDD48O node will not falsely pull up the LVMODE pin
due to high reverse leakage through the diode. Please see
Table 5 for part number information.
An appropriate ratio of R2 and R1 resistors should be used
to ensure proper operation across all supply voltages.
Table 5 lists appropriate choices of R2 and R1 resistors to
work with a variety of popular local adapter DC voltages.
Though a common value of R2 and R1 can be used across
the whole range of local supply voltages from 9.5V to 57V,
using different value pairs, per the table below, will
minimize power consumption. The maximum input voltage
at the LVMODE pin should not exceed 6V, so a Zener
diode (D1) is recommended to limit transient voltage
excursions at the pin.
Since the input current at the LVMODE pin defines its state,
it is not recommended to drive other circuits or components
directly from the LVMODE node (such as an LED) that
might draw current. LEDs or current-absorbing components
may be driven directly from the Local Supply pin.
The AS1138 internal DC-DC controller is designed to
operate
with
input
voltages
of
9.5V-57V,
to
allow
applications to take advantage of the LVMODE feature.
Besides configuring the device for operation from a local
power source, the external power transformer must also be
designed to ensure proper operation across the complete
input range.
Table 8 - LVMODE Configuration
Local
Voltage
Range
Recommended
Local Adapters
R2
R1
9.5V-57V
12V, 18V
2.74k
4.02k
20V-57V
24V, 30V
11.3k
4.02k
32.4V-57V
36V, 48V
20k
4.02k
Diode D1: 5.6V Zener, BZT56V
Diode D2: S3B (100V/3A, worst-case reverse leakage
<250uA), use of a low reverse-leakage diode with
worst-case reverse leakage under high temperature
<350uA is recommended.



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