SIRIUS DC/DC CONVERTER
POWER PRODUCTS
48V Input – 9.6VDC – 47A Output
GALW9V647
GALW9V647 – 1/4 Brick Sirius
• High efficiency: 93.5% at 9.6V, 47A
94.5% at 9.6V, 23.5A
•
Very low common-mode noise for a
commercial DC/DC converter
•
Two-stage input filter
•
Constant switching frequency
•
Single board design, very low parts count
•
“Stretched” quarter-brick 1.45" x 4.25" x 0.95"
including integrated heat sink
Typical Characteristics
Control Functions
•
Output setpoint accuracy: ± 5%
•
Uses patented power supply control and architecture
•
Load regulation: ± 2%
•
Microprocessor controlled
•
Line regulation: ± 0.2%
•
Primary-side enable, choice of logic
•
Regulation over line, load, and temperature: ± 10%
•
Low output ripple
•
Output trim
Protection Features
•
Over temperature protection
•
Over voltage protection
•
Over current protection
•
Over/Under input voltage protection
Ordering Information
Standard Model
Number
GALW9V647*
* Options:
E = 0.18" Pins (± .01")
Input
Voltage
Output
Voltage
Max
Current
48V
9.6V
47A
Note: Standard unit is positive logic and
requires 2000µF of output load
capacitance for stability.
Example Part Number:
(All options)
GALW9V647 E
Part Number
Options:
Pin Length
E = 0.18"
©2008 Bel Fuse Inc.
Specifications subject to change without notice. 07.08
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 1
POWER PRODUCTS
SIRIUS DC/DC CONVERTER
48V Input – 9.6VDC – 47A Output
GALW9V647
Input Specifications
Parameter
Min
Operating Input Voltage
Typical
36
Input Current, Low Line
Max
Units
75
VDC
13.5
A
Input Capacitance
8
µF
Input Hysteresis, Low Line
2
VDC
VIN = 48VDC, TA@25˚ C, 300 LFM Airflow, VOUT = 9.6VDC, IOUT = Full load unless otherwise noted.
Available output power depends on ambient temperature and good thermal management.
(See application graphs for limits.)
Output Specifications
Parameter
Min
Typical
Max
Units
Output Voltage
9.2
9.6
10
V
450
W
12.48
V
Output Power
Over Voltage Protection, Latching
11.04
11.52
Operating Output Current Range
0
47
A
Output Current Limit
50
65
A
Efficiency, Full Load1
93
%
1.For temperature rise design calculation.
©2008 Bel Fuse Inc.
Specifications subject to change without notice. 07.08
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 2
SIRIUS DC/DC CONVERTER
POWER PRODUCTS
48V Input – 9.6VDC – 47A Output
GALW9V647
Features
Parameter
Min
Typical
Over Temperature Protection, Thermal Sensor, Latching2
Switching Frequency, Fixed
Max
Units
125
˚C
250
Trim Range
8.64
kHz
10.56
V
2. PCB less than 130˚ C.
General Specifications
Operating Temperature
Storge Temperature
Relative Humidity
Vibration
Material Flammability
-40˚ C to + 100˚ C
-55˚ C + 125˚ C
10% to 95% RH, Non-condensing
2 to 9 Hz, 3mm disp., 9 to 200 Hz, 1g
UL V-0
Weight
TBD
MTBF Telcordia (Bellcore)
TBD
©2008 Bel Fuse Inc.
Specifications subject to change without notice. 07.08
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 3
SIRIUS DC/DC CONVERTER
POWER PRODUCTS
48V Input – 9.6VDC – 47A Output
GALW9V647
Application Notes
CoolConverter™
Bel Power’s Proprietary CoolConverter™
• Patented single-stage power conversion architecture,
control and magnetic design allow unprecedented
power density and efficiency in an isolated power
supply.
•
An advanced microcontroller reduces parts count while
adding features, performance and flexibility in the design.
Protection and Control
Over Voltage Hysteresis
1.0
Normalized
Output Voltage
Valid Input Voltage Range
The converter measures the input voltage and will not allow
operation outside of the input voltage specification. As
shown by the graphs, hysteresis is added to both the high
and low voltage to prevent the converter from turning on and
off repeatedly when the voltage is held near either voltage
extreme. At low line, this assures the maximum input current
is not exceeded; at high line, this assures the semiconductor
devices in the converter are not damaged by excessive
voltage stress.
ON/OFF Logic Option
The ON/OFF control logic can be either Negative (standard)
or Positive to enable the converter. For Negative logic, the
ON/OFF pin is brought to below 1.0V with respect to the
–INPUT pin to enable the converter. The pull-down must be
able to sink 100µA. For Positive logic, the ON/OFF pin is
brought to greater than 4.0V with respect to the –INPUT pin
and be limited to less than 10V. To request the Positive logic
version, add the suffix (P) to the standard part number. The
ON/OFF pin has a built-in pull-up resistor of approximately
100kΩ to +5V.
©2008 Bel Fuse Inc.
77
77.5
78
78.5
79
79.5
80
Under Voltage Hysteresis
Normalized
1.0
0
30
31
32
33
34
35
36
Input Voltage (V)
Specifications subject to change without notice. 07.08
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 4
80.5
Input Voltage (V)
Output Voltage
Output Over Voltage Protection
The output voltage is constantly monitored by the
microprocessor with a redundant secondary-side
measurement circuit that both shuts down the duty cycle and
triggers the microprocessor to shut down. If the output voltage
exceeds the over voltage specification, the microprocessor
will latch the converter off. To turn the converter on required
either cycling the ON/OFF pin or power to the converter. This
advanced feature prevents the converter from damaging the
load if there is a converter failure or application error. If nonlatching is required, consult factory.
0
76.5
37
SIRIUS DC/DC CONVERTER
POWER PRODUCTS
48V Input – 9.6VDC – 47A Output
GALW9V647
CoolConverter™
Protection and Control
Thermal Shutdown
The printed circuit board temperature is measured using a
semiconductor sensor. If the maximum rated temperature
is exceeded, the converter is latched off. To re-enable the
converter requires cycling the ON/OFF pin or power to the
converter. If non-latching is required, consult factory.
Trim-up
Rtrim-UP
=
{
Vo (100+∆%) _ (100+2∆%)
1.225∆%
∆%
Control Options
As the behavior of the circuit is determined by firmware in the
microcontroller, specific requirements, such as:
• non-latching thermal protection
• custom valid input voltage range
• controlled delay from initiating an ON/OFF signal for power sequencing
can be accomplished with no change to hardware. The
standard behavior was chosen based on system design
experience, but customers may have their own requirements.
Please contact Bel Power for any special needs.
}
5.11kΩ
9.6V Trim-up
N/A
Safety
An external input fuse must always be used to meet these
safety requirements.
External Output Trimming
Trim-down
Rtrim-DOWN =
+ Out
{
Trim
}
100 _ 2
∆%
5.11kΩ
Trim-down
1000
Trim
To trim the output voltage higher, connect the required trim
resistor from the Trim pin to the +Out pin. To trim the output
voltage lower, connect the required trim resistor from the Trim
pin to the –Out pin.
Trim Resistance (kΩ)
– Out
100
10
0
1
2
3
4
5
6
7
8
9
10
Decrease in Output Voltage (%)
©2008 Bel Fuse Inc.
Specifications subject to change without notice. 07.08
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 5
SIRIUS DC/DC CONVERTER
POWER PRODUCTS
48V Input – 9.6VDC – 47A Output
GALW9V647
Efficiency
EfficiencyData
Power
Dissipation
Power
Dissipation
96
40
Power Dissipation(W)
Efficiency (% )
95
94
93
92
91
90
89
36V Vin
48V Vin
75V Vin
88
87
86
0
20
10
30
40
50
35
30
25
20
15
36V Vin
48V Vin
75V Vin
10
5
0
10
0
Output Current (A)
20
30
40
50
Output Current (A)
Start
Up
Start Up
Voltage
Ripple
Voltage Ripple
CH2
CH2
CH1
CH3
CH1
1) Vout 50mV
/div 1
µS/div
1. VOUT 2V 10mS/div
2. IOUT 10A/div
3. Enable 5V/div
1.V
2) IoutOUT
10A/dif 50mV/div 1µS/div
10µF ext cap 20MHz BW
2. IOUT 10A/div
1) Vout 2V/div10mS/div
2) Iout 10A/div
3) Enable 5V/div
Line/Load
Line/LoadRegulation
Regulation
Transient
TransientResponse
Response
10.6
Setpoint Accuracy 0.6396%
Line Regulation0.0212
%
Load Regulation0.1638%
Line & Load Regulation0.1794%
Output Voltage (V)
10.4
10.2
CH1
10.0
9.8
9.6
9.4
9.0
8.8
8.6
CH2
36V Vin
48V Vin
75V Vin
9.2
0
10
20
30
40
50
Output Current (A)
©2008 Bel Fuse Inc.
1) Vout 500mV/d
iv 400µS/div
1.2) V
500mV/div 400µS/div
Iout
10A/div
OUT
2. IOUT 10A/div
Specifications subject to change without notice. 07.08
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 6
SIRIUS DC/DC CONVERTER
POWER PRODUCTS
48V Input – 9.6VDC – 47A Output
GALW9V647
Back Bias
Back Bias
Over Current Protection
Note: Over current
protection Protection
is blip-mode (aka hiccup).
Over-current
Note: Over-cur
rent protection is blip-mode (aka hiccup).
CH1
CH2
Output Voltage (V)
10
8
36V Vin
48V Vin
75V Vin
6
4
2
0
47
52
57
67
62
Output Current (A)
1) Vout 2V/div 10mS/div
2) Enable 5V/div
1. VOUT 2V/div 10mS/div
2. Enable 5V/div
Over
Voltage
Over
Voltage Protection
Pr
otection
Thermal
Derating
Thermal Derating
50
Output Current (A)
45
40
35
30
25
Lengthwise:
400LFM
200LFM
Crosswise
400LFM
200LFM
20
15
10
5
0
0
10
20
30
40
50
60
70
80
90
Ambient Temperature (°C)
1) Vout 2V
/div 4mS/div
1. VOUT 2V/div 4mS/div
©2008 Bel Fuse Inc.
Specifications subject to change without notice. 07.08
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 7
SIRIUS DC/DC CONVERTER
POWER PRODUCTS
48V Input – 9.6VDC – 47A Output
GALW9V647
Mechanical
GALW9V647
Pin Configuration – Bottom View
Pin
Function
Pin Dia. (In.)
1
+ Input
0.040
2
On/Off
0.040
3
– Input
0.040
4
– Output
0.060
5
Trim
0.040
6
+ Output
0.060
©2008 Bel Fuse Inc.
Specifications subject to change without notice. 07.08
CORPORATE
FAR EAST
EUROPE
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
Bel Fuse Ltd.
8F / 8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel 852-2328-5515
Fax 852-2352-3706
www.belfuse.com
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Suite G7, Preston
Lancashire, PR1 8UQ, U.K.
Tel 44-1772-556601
Fax 44-1772-888366
www.belfuse.com
page 8