BTCPower
Prelim. Specification
TM
Broadband TelCom Power,
Inc.
Redefining “Current” Limits In Power Conversion
HBO70A-48-3.3, HBO70A-48-3.3N
48Vin 3.3Vout 70A
Description
The HBO70A-48-3.3 of low cost half brick DC/DC
converters are comparable to existing half-bricks. They
are targeted specifically at the telecommunication,
industrial electronics, mobile telecommunication and
distributed power markets. With a wide input voltage
range of 36-75V they are available with output voltage
of either 1.5, 1.8, 2.5, 3.3 or 5 Volts. All models feature
an input filter, input undervoltage lockout, output
overvoltage and overtemperature protection, output
current limiting and short circuit protection. The unique
open-frame construction with aluminum heat spreader
design achieves efficient heat transfer with no hot
spots.
Features
• Delivers up to 100A in half brick
• No minimum load required
• Low profile of only 0.36 inch
• 1.5V, 1.8V, 2.5V, 3.3V or 5V output models
• Wide input operating range 36-75V
• -40°C to +100°C ambient operation
• On/Off pin and remote sense
• Output adjustment +10% and –10% range
• 1500V, 10M
input-to-output isolation
• Meets Basic Insulation requirements of
EN60950
• UL 1950 recognized, TUV EN60950 and CSA
C22.2 No. 60950-00 Certified (pending)
• Meets conducted limits of FCC Class B and
CEI IEC61204-3 Class B with external filter
• MTBF of 1,000,000 hours @ 50°C
(Bellcore)
Applications
•
•
•
•
•
•
•
Telecommunications
Data Communications
Wireless Communications
Networking Gear
Servers, Switches and Data Storage
Semiconductor Test Equipment
Distributed Power Architecture
Broadband TelCom Power, Inc.
1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A.
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com •
PS HBO70A-48-3.3 Rev1.1 9-15-03
Prelim. Specification
HBO70A-48-3.3
48Vin
3.3Vout 70A
BTCPower
CONVERTER SELECTION
TM
Typical @ T
a
=+25°C under nominal line voltage and 75% load conditions, unless noted.
Model
Part Number
Voltage (Volts)
Nominal
48
Range
36-75
Input
Current (A)
No load
0.1
Full load
5.46
Output
Voltage
(Volts)
3.3
Current
(Amps)
70
Efficiency
75% Load
(%)
88
Positive Logic
HBO70A-48-3.3
Negative Logic
HBO70A-48-3.3N
For encapsulated (epoxy enclosed) models, replace “HBO” in part no. with “HBP”.
Consult factory for other output voltage configurations.
Outline and Pin-out Information
Pin Connection
Pin#
Function
1
2
3
4
5
6
7
8
9
Vin +
On/Off
Case
Vin -
Vout -
Sense -
Trim
Sense +
Vout +
All dimensions are in inches [mm]
Pin 5 and 9 are dia. 0.08 [2.03]
All other pins are all dia. 0.040 [1.02]
Pin material: Brass
Pin finish: Tin/Lead plated
Heat spreader (baseplate) material: Aluminum
Weight: 60.5g
Tolerance
Inches
•XX
±
0.020
•XXX
±
0.010
Pin:
±
0.002
Millimeters
•X
±
0.5
•XX
±
0.25
±
0.05
The information and specifications contained in this specification are believed to be accurate and reliable at the time
of publication. Specifications are subject to change without notice.
Broadband TelCom Power, Inc.
1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A.
P
2 of 7
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com •
PS HBO70A-48-3.3 Rev1 9-15-03
Prelim. Specification
HBO70A-48-3.3
48Vin
3.3Vout 70A
BTCPower
TM
Electrical Specification
Typical test data at Ta=25°C, Vin=48V unless otherwise noted.
PARAMETER
Absolute maximum rating
Input voltage
Operating case temperature
Storage temperature
Humidity
Input characteristics
Operating input voltage range
Turn on voltage threshold
Turn off voltage threshold
Off converter input current
Output characteristics
Output voltage
HBO70A-48-3.3 or HBO70A-48-3.3N
Line regulation
Load regulation
Output current
HBO70A-48-2.5 or HBO70A-48-2.5N
Output voltage trim range
Output voltage ripple and noise
Output over power protection
Over-voltage protection
Over-temperature protection
Temperature coefficient
Output dynamic characteristics
Startup time
Transient recovery time
Transient Peak
Efficiency
HBO70A-48-3.3 or HBO70A-48-3.3N
Isolation characteristics
Isolation voltage(primary to secondary)
Isolation voltage (primary to case)
Isolation voltage (secondary to case)
Isolation resistance
Isolation voltage (secondary to case)
NOTES
MIN
0
-40
-40
TYP
MAX
80
100
105
95
75
35.8
34.8
UNIT
V
°C
°C
%
V
V
V
mA
36
35
34
36Vin
35.4
34.4
6
36-75Vin, no load to full load
36-75Vin,
36-75Vin, 10~100% load
2.47
2.50
0.2
0.2
2.53
0.3
0.3
70
+10
V
%
%
A
%
mV(pk-pk)
%
%
°C
%/°C
ms
µs
mv
%
VDC
VDC
VDC
MΩ
0
Percentage of normal output
20Mz bandwidth, 100% Load, 48Vin
110
115
105
-10
70
120
100
140
130
110
±0.05
20
500
400
5% to 95% of the output voltage
25% load change (2.0A/us)
25% load change (2.0A/us)
10
300
300
88
1minute
1minute
1minute
500VDC, Primary to secondary
1minute
10
1500
1000
1000
1000
VDC
Feature Characteristics
Switching frequency
ON/OFF control (Positive logic)
Converter On
Converter Off
ON/OFF control (Negative logic)
Converter On
Converter Off
Calculated MTBF
Weight
280
2.5
-1.0
-1.0
2.5
3,000,000
51
300
320
7
0.5
0.5
7
KHz
V
V
V
V
Hrs
g
HBO70A-48-3.3
HBO70A-48-3.3N
Bellcore @ 50°C
Broadband TelCom Power, Inc.
1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A.
P
3 of 7
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com •
PS HBO70A-48-3.3 Rev1 9-15-03
Prelim. Specification
HBO70A-48-3.3
48Vin
3.3Vout 70A
BTCPower
TM
Basic operation and functions
The
HBO / HBP family
uses planar transformer
technology to achieve high output current. The
whole unit switches at the fixed frequency for a
predictable EMI performance. The
HBO / HBP
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 ( pin9, pin5 )
Output power Vout(+) must be connected to
Positive output voltage pin9; Output power
Vout(-) must be connected to Negative output
voltage pin5.
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.
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.
Remote Sense ( pin 8, pin 6 )
Permits the user to maintain the accurate output
voltage at the remote load terminals regardless of
the line drop.
The Sense(-) (pin6) and Sense(+) (pin8) should
be connected at the load or at the point where the
regulation is needed. ( shown on Fig. 2)
Fig 2: Remote Sense Circuit
Fig. 1: Typical Circuit for On/Off Function
The remote sense feature of the unit
compensates for voltage drop occurring between
the output pins of the unit and load. The Sense(-)
(pin5) and Sense(+)(pin7) should be connected at
the load or at the point where regulation is
required.
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 HBO70A-48-3.3 Rev1 9-15-03
Prelim. Specification
HBO70A-48-3.3
48Vin
3.3Vout 70A
BTCPower
TM
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.
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 4. Trim Down Output Voltage Circuit
Fig 3. Trim Up Output Voltage Circuit
Trimming down the output voltage for a typical
circuit, as shown on Fig. 4.
Broadband TelCom Power, Inc.
1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A.
P
5 of 7
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com •
PS HBO70A-48-3.3 Rev1 9-15-03
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