TM
Prelim. Specification
HBO100A-48-1.8
48Vin 1.8Vout 100A
If remote Sense is not required, the Sense(-) pin
must be connected to the Vout(-) pin (pin5), and
the Sense(+) pin must be connected to the
Vout(+) pin(pin 9) to ensure the unit will regulate
at the specified output voltage. If these
connections are not made, the unit’s output
voltage will be higher than the specified value.
The unit output over voltage protection senses
the voltage across Vout(+) and Vout(-), and not
across the sense lines, so the resistance between
the output pins of the unit and the load should be
minimized to prevent unwanted triggering of the
OVP.
Fig 3. Trim Up Output Voltage Circuit
For Trim up resistor value, we list the reference
“Trim Up Resistance” for increasing the output
voltage for every 1 percent (see Trim Table 1).
When using the remote sense feature, the output
voltage at the unit can be increased by as much
as 10% above the normal rating, in order to
maintain the required voltage across the load.
Therefore, the designer must consider this
condition.
Fig 5. shows “Trim Up Resistance” value chart.
Trimming down the output voltage for a typical
circuit, as shown on Fig. 4.
Also when using the remote sense function, the
output power must be taken care of, as not to
exceed the maximum power capability of the unit.
Output Voltage Trim (pin 7)
Permits the user to adjust the output voltage up
or down to achieve the custom voltage or to make
the output voltage margining. The adjustment
range is from + 10% to -10%.
Fig 4. Trim Down Output Voltage Circuit
Output voltage can be adjusted up or down, by
connecting the Rtrim-up or Rtrim-down resistor as
shown. Rtrim-up makes the output voltage go up
to 10%; and the Rtrim-down makes the output
voltage go down to 10%.
For Trim down resistance value, we list the
reference “Trim Down Resistance” for decreasing
output voltage for every 1 percent (see Trim
Table 2.).
Leave Trim pin ( Pin 7) open for normal output
voltage.
Fig 6 shows “Trim Down Resistance” value chart.
When trimming up, care must be taken, not to
exceed the unit OVP threshold. A typical circuit is
shown in Fig. 3.
Broadband TelCom Power, Inc. 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A.
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Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com • PS HBO100A-48-1.8 Rev1.2 12-8-03
BTCPOWER [ BROADBAND TELCOM POWER, INC. ]
