Technical Specification
HB75D-24 Series
Dual output Half Bricks 75W
BTCPower
TM
Basic operation and functions
The
HB75D family
uses planar transformer
technology to achieve high output current. The
whole unit switches at the fixed frequency for a
predictable EMI performance. The
HB75D Brick
has many standard controls and protection
functions.
Input Power ( pin1, pin4 )
Input power Vin(+) must be connected to Positive
input voltage pin1; Input power Vin(-) must be
connected to Negative input voltage pin4.
Output Power 1 ( pin8, pin9 )
Output power Vout 1(+) must be connected to
Positive output voltage pin8; Output power
Vout1(-) must be connected to Negative output
voltage pin9.
Output Power 2 ( pin5, pin6 )
Output power Vout 2(+) must be connected to
Positive output voltage pin5; Output power
Vout2(-) must be connected to Negative output
voltage pin6.
On/Off ( pin 2 )
Permits the user to maintain unit On/Off, in order
to properly sequence different power supplies
and reduce power consumption during the
standby condition. There are two remote control
options available, positive logic and negative logic
is referenced to Vin(-), and typical connections
are shown in Fig 1.
Fig. 1: Typical Circuit for On/Off Function
Pin 2 is the "Enable" pin, connecting a TTL
compatible pin. A TTL control signal to this pin,
according to the specification, will turn the unit on
or off.
The positive logic version turns on when pin 2 is
at logic high, and turns off when pin 2 is at logic
low. The unit is on when pin 2 is left open.
The negative logic version turns on when pin 2 is
at logic low and turns off when pin 2 is at logic
high. The pin 2 can be directed to Vin(-), to
enable automatic turn on to the unit without the
need of an external control signal.
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 + 5% to -5%.
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 5%; and the Rtrim-down makes the output
voltage go down to 5%.
Leave Trim pin ( Pin7, 10) open for normal output
voltage.
Broadband TelCom Power, Inc.
1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A.
P
4 of 7
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com •
PS HB75D-24 Rev1 10-14-02
BTCPOWER [ BROADBAND TELCOM POWER, INC. ]
