Technical Specification
HB50 Series
48Vin 3.3, 5, 12, 15Vout 50W
BTCPower
TM
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.
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.
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%.
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%.
Leave Trim pin ( Pin 7) open for normal output
voltage.
When trimming up, care must be taken, not to
exceed the unit OVP threshold. A typical circuit is
shown in Fig. 3.
Fig 3. Trim Up Output Voltage Circuit
Trimming down the output voltage for a typical
circuit, as shown on Fig. 4.
Fig 4. Trim Down Output Voltage Circuit
Broadband TelCom Power, Inc.
1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A.
P
6 of 8
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com •
PS HB50-48 Rev2 16-1-04
BTCPOWER [ BROADBAND TELCOM POWER, INC. ]
