TM
Prelim. Specification
HBO80A-48-2.5
48Vin 2.5Vout 80A
Protection Features
Over Temperature Protection ( OTP )
Input Under-voltage lockout ( IUV )
The unit will shut down when the base plate
temperature exceeds the protection threshold.
Input under voltage ( IUV ) is standard with the
HBO / HBP unit. The unit will shut down when the
input voltage drops below a threshold, and the
unit will turn on when the input voltage goes to
the upper threshold.
The unit will shut down under the base plate
temperature over a 105°C condition to protect the
unit from overheating. The OTP circuit will turn
the unit off when OTP happens. Once the unit
has shut down, it will restart at the cycle when the
base plate temperature goes down.
The hysteretic voltage of the under voltage
protection is 1V, normally from the 34.5V to 35.4V
range.
Output Over-current Protection ( OCP )
The unit will shut down when the over current or
short circuit condition exists.
Once the OCP happens, the unit has shut down.
The attempted restart will continue indefinitely
until the over current or short circuit condition is
removed. When OCP happens, the output
voltage drops below 0.8V.
Input voltage has almost no effect on the current
limit point.
Output Over-voltage Protection ( OVP )
The unit will shut down when the output voltage
exceeds the over voltage threshold.
If the output voltage across Vout(+) (pin9) and
Vout(-) (pin5) exceeds the threshold of the OVP
circuitry, the unit has shut down which is caused
by an OVP circuit, and the unit will never restart,
and the output voltage is below 0.5V.
Broadband TelCom Power, Inc. 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A.
P 7 of 8
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com • PS HBO80A-48-2.5 Rev1.2 12-8-03
BTCPOWER [ BROADBAND TELCOM POWER, INC. ]
