©2006, KEPCO, INC 1
Data subject to change without notice 228-1299 REV 5
INSTRUCTION MANUAL
KEPCO
KEPCO, INC. " 131-38 SANFORD AVENUE " FLUSHING, NY. 11352 U.S.A. " TEL (718) 461-7000 "
FAX (718) 767-1102
http://www.kepcopower.com "
email: hq@kepcopower.com
An ISO 9001 Company.
HSF
50W
KEPCO SINGLE OUTPUT 50 WATT
HOT SWAP PLUG-IN POWER SUPPLIES
I — INTRODUCTION
The Kepco HSF 50 Watt Series hot swappable, high frequency switching, plug-in power supplies employ forward conversion
and are designed to operate in a fault tolerant power system with either a-c or d-c input. A thermistor soft-start circuit limits
start-up surge. A built-in forced current share circuit and OR-ing diodes allow configuration for hot-swap and parallel-redundant
N+1 operation.
These power supplies are designed to be used with Kepco’s Series RA 19-(X)B rack adapters. The RA 19-8B rack adapter
accepts up to eight 50 Watt or 100 Watt units (see Figure 1); RA 19-7B accepts up to four 50 Watt or 100 Watt units and three
150 Watt units; RA 19-6B accepts up to six 150 Watt units. All input/output connections are through a 24 pin connector that
plugs in to the rack adapter. All external connections are made through the rack adapter. Surface mount technology permits effi-
cient component layout for minimum mounting space.
Five models may be selected for outputs of 5, 12, 15, 24, or 48V (see Table 1).
When the input is cut off, the output is maintained for 15 milliseconds minimum. If the power supply shuts down due to an output
overvoltage condition, it is then necessary to wait 60 seconds minimum before turning the unit on again. EMI filtering is designed
to meet FCC Class B rating and VDE 0871 Class B rating. This page contains specifications for each model of the HSF 50 Watt
Series. Environmental specifications for each model are the same.
II — FEATURES
FRONT PANEL ACCESS. The front panel provides a power ON/OFF switch controlling input power and a “VDC ON” light
which indicates when the unit is operating. NOTE: The ON/OFF switch must be set to OFF before removing unit from rack
adapter. The front panel “MASTER ON” LED lights when 1) the unit operates independently, or 2) the unit is used in parallel
redundant configurations while a) the output is less than 10% of nominal or b) the output is within 10% to 100% of nominal and
the unit is functioning as a master. In parallel redundant configurations, the module with the highest voltage functions as the
master. The other units are slaves, and track the output voltage of the master. Refer to Current Share Bus (CSB) on page 3 for
details. The front panel Vadj trimmer provides adjustment of the output voltage within the limits specified in Table 1; test points
connected to the +S and –S lines are available at the front panel for measuring the output.
FORCED CURRENT SHARE CIRCUIT. When units are configured for N+1 parallel redundant operation, it is desirable for cur-
rent to be divided equally among the paralleled supplies. When the CSB (Current Share Bus) lines of paralleled HSF units are
connected together, the load current is forced to divide equally between all paralleled units. If one unit fails, the remaining units
will continue to supply the load, and the load current will be divided equally among the remaining operating units. The failed unit
is automatically isolated from the circuit by a built-in isolation diode. Refer to Current Share Bus (CSB) on page 3 for details.
TABLE 1. OUTPUT RATINGS AND SPECIFICATIONS, HSF 50W SERIES
MODEL HSF 5-10 HSF 12-4.2 HSF 15-3.4 HSF 24-2.1 HSF 48-1
OUTPUT VOLTS, d-c (NOMINAL)
5.0V 12.0V 15.0V 24.0V 48.0
ADJUSTMENT RANGE
4.5 - 5.5V 11.4 - 12.6V 13.5 - 16.5V 22.5 - 25.5V 45 - 51V
OUTPUT CURRENT (NOMINAL)
(1)
(1) Derates same as Ouptut Power.
10.0A 4.2A 3.4A 2.1A 1.0A
OUTPUT POWER (NOMINAL)
(2)
(2) See power derating curve, Figure 4.
50.0W 50.4W 51.0W 50.4W 48W
RIPPLE
AND
NOISE
(mV p-p)
0-40°C
10-100% LOAD
source (typ)
10 15 15 25 30
source (max)
20 30 30 30 60
switching (typ)
30 35 45 50 60
switching (max)
60 70 90 100 150
spike noise (d-c—50MHz)
120 190 220 310 350
OVERVOLTAGE SETTING 25 °C, NOM. INPUT
6.5 - 7.5V 13.7 - 15.7V 17.0 - 19.0V 27.0 - 30.5V 53.5 - 60.0
OVERCURRENT SETTING 25°C, NOM. INPUT
Rectangular type characteristic
10.5 - 12.0A 4.4 - 5.1A 3.6 - 4.1A 2.2 - 2.6A 1.1 - 1.3A
(4 Seiten)
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