Part No. 02-GHB-03 Rev. 0.94 031605
WWW.GALAXYPWR.COM
GHBW53V08 1
Galaxy Power Inc. 155 Flanders Road Westborough, MA 01581 Telephone: 508-870-9775 Fax: 508-870-9796 e-mail: info@galaxypwr.com
The Bolero HP half-brick is a High
Power CoolConverterTM in the Galaxy
family of high-voltage, high-efficiency
DC/DC converters.
Industry Standard Pinout and Footprint
Highest Efficiency in the Industry
Low Thermal Impedance Baseplate Standard
Two-stage Input Filter
Constant Switching Frequency, 270kHz
Remote Sense
Optional Heatsinks
Header with M3 Metal Inserts for Mechanical
Connection to PCB
Two Year Warranty
Control Functions
Microprocessor Controlled
Primary-side Enable, Choice of Logic
Standard Protection Features*
Over Temperature Protection, Auto-restart
Over Voltage Protection, Latching
Over Current Protection, Latching
Over/Under Input Voltage Lockout
Typical Characteristics
Output Setpoint Accuracy: 1%
Load Regulation: 0.2%
Line Regulation: 0.2%
Regulation over Line, Load, and Temperature: 2%
Low Output Ripple
Industry Standard Output Trim
*Consult factory for other options.
BOLERO HP
48V Input, 53VDC, 8A Output
Single board construction with power
components and planar magnetics
thermally connected to an insulated
baseplate give the highest power
density for a converter in this class.
Open frame design is compatible
with water wash process.
Meets IEEE 802.3af Std for 2250V
Isolation for Power over Ethernet
Applications.
GHBW53V08 Features:
48V Input
53VDC, 8A Output
High Efficiency:
93.5% at 53V, 8A
94.0% at 53V, 4A
ISO 9001 CERTIFIED ORGANISATION
Certified to ISO 9001:2000
Eighth-brick
Quarter-brick
Quarter-brick
Half-brick
Half-brick
Half-brick
Half-brick
SIP
SIP
3-Quarter-brick
3-Quarter-brick
GHBW53V08A 2
WWW.GALAXYPWR.COM
Part No. 02-GHB-03 Rev. 0.94 031605
Galaxy Power Inc. 155 Flanders Road Westborough, MA 01581 Telephone: 508-870-9775 Fax: 508-870-9796 e-mail: info@galaxypwr.com
General Specifications
V
IN
= 48V
DC
, T
A
@25 C, 300 LFM airflow, V
OUT
= 53V, I
OUT
= Full Load unless otherwise noted. C
OUT
= 180F Al-Elec
Available output power depends on ambient temperature and good thermal management. (See application graphs for limits.)
Input Characteristics
Parameter
Min
Typ
Max
Units
Operating Voltage Range
38
42
55
V
Input Current, No Load @48Vin
0.05
0.11
A
Input Current, Full Load @48Vin
9.35
9.55
A
Input Current, Maximum Low Line
13
A
Input Capacitance
8
F
Input Hysteresis, Low Line
2
V
DC
Output Characteristics
Regulation Over Line, Load & Temperature
2
%V
NOM
Voltage Ripple
50
V
RMS
Voltage Ripple, 500kHz BW, 1F ext cap
120
150
mV
P
-
P
Voltage Ripple, 500kHz 1MHz, 1F ext cap
50
mV
P
-
P
Voltage Ripple, >1MHz, 1F ext cap
30
mV
P
-
P
Current Range
0
8
A
Current Limit Inception, Latching
9
11
A
Output Transient Response, 25% to 75% load change, 1A/sec
3
%
Settling Time to 1%
400
S
Turn-on Time to 98% Vnom
50
mS
Output Overshoot at Turn-on
0
%V
OUT
Trim Range
42
56
V
Overvoltage Protection, Latching
57
58.5
60
V
DC
Isolation
1
Isolation Test Voltage, Input/Output (Basic)
2250
V
DC
Isolation Resistance
10
M
Features
Overtemperature Protection, Thermal Sensor, Auto-restart
2
98
105
C
Input, Output Ripple Frequency, Fixed
270
kHz
Notes:
1. Isolation: Output to Case = 2000VDC; Input to Case = 1000VDC; Input to Output = 2250VDC
2. PCB less than 130 C
Approvals and Standards
UL and c-UL Recognized Component,
TUV, UL1950, CSA 22.2 No. 950,
IEC/EN60950** pending.
EMC Characteristics:
Designed to meet emission and immunity
requirements per EN55022, CISPR22,
Class B and CISPR24.
** An external fuse shall be used to comply with the
requirements.
General Specifications
Operating Temperature
40 C to +100 C
Storage Temperature
55 C to +125 C
Relative Humidity
10% to 95% RH,
Non-condensing
Vibration
2 to 9Hz, 3mm disp.,
9 to 200Hz 1g
Material Flammability
UL V-0
Weight
TBD
MTBF BELLCORE TR-332
1,600,000 hours
Part No. 02-GHB-03 Rev. 0.94 031605
WWW.GALAXYPWR.COM
GHBW53V08 3
Galaxy Power Inc. 155 Flanders Road Westborough, MA 01581 Telephone: 508-870-9775 Fax: 508-870-9796 e-mail: info@galaxypwr.com
CoolConverter
TM
Family
Galaxy's C
OOL
C
ONVERTERS
TM feature:
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.
Application Notes
Protection and Control
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 semicon-
ductor 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, bring the ON/OFF pin to less than
1.0V with respect to the INPUT pin to enable the
converter. The pull-down must be able to sink
100A. For Positive logic, bring the ON/OFF pin 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 stan-
dard part number. The ON/OFF pin has a built-in pull
up resistor of approximately 100k to +5V.
Output V
oltage (V)
Input Voltage (V)
34
33
36
37
35
60
50
40
30
20
10
0
Undervoltage Hysteresis
0Aout
5Aout
Output V
oltage (V)
Input Voltage (V)
54.5
54
55.5
56
55
56.5
57
60
50
40
30
20
10
0
Overvoltage Hysteresis
0Aout
5Aout
GHBW53V08A 4
WWW.GALAXYPWR.COM
Part No. 02-GHB-03 Rev. 0.94 031605
Galaxy Power Inc. 155 Flanders Road Westborough, MA 01581 Telephone: 508-870-9775 Fax: 508-870-9796 e-mail: info@galaxypwr.com
APPLICATION NOTES
Output Over Voltage Protection:
The output voltage is constantly monitored by the
microprocessor. If the output voltage exceeds the
over-voltage specification, the microprocessor will
latch the converter off. To turn the converter on
requires either cycling on the ON/OFF pin or power to
the converter. This advanced feature prevents the
converter from damaging the load if there is a con-
verter failure or application error. If non-latching is
required, consult factory.
Thermal Shutdown:
The baseplate temperature is monitored with a PTC
thermal sensor. If the maximum rated temperature is
exceeded, the converter behaves as described in the
specifications (latch or auto-restart). If the converter
is the latching type, it is re-enabled by either cycling
the power or enable ON/OFF. If the converter is the
non-latching type, it will restart when the temperature
decreases below the trip point and no less than 2
seconds, whichever occurs later.
Control Options:
As the behavior of the circuit is determined by
firmware in the microcontroller, specific customer
requirements such as:
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 we understand that customers
often have their own requirements.
Please consult Galaxy Power for your special needs.
Remote Sense:
The output voltage is regulated at the point where
the sense pins connect to the power output pins. Total
sense compensation should not exceed 1V.
External Output Trimming
6
6
8
8
7
7
Safety:
An external input fuse must always be used to meet
these safety requirements.
Trim:
To trim the output voltage higher, connect the
required trim resistor from the Trim pin to the
+Sense pin. To trim the output voltage lower, con-
nect the required trim resistor from the Trim pin to
the Sense pin. See diagram below.
{
}
R
TRIM-UP
=
Vo (100+%)
(100+2%)
k
1.225%
%
R
TRIM-DOWN
=
100
2
k
%
{
}
Decrease in Output Voltage (%)
1000
100
10
0
0
1
2
3
4
5
6
7
8
9
10
T
rim Resistance (k
)
Trim-down
Increase in Output Voltage (%)
10000
1000
100
0
1
2
3
4
5
6
7
8
9
10
T
rim Resistance (k
)
52V Trim-up
Part No. 02-GHB-03 Rev. 0.94 031605
WWW.GALAXYPWR.COM
GHBW53V08 5
Galaxy Power Inc. 155 Flanders Road Westborough, MA 01581 Telephone: 508-870-9775 Fax: 508-870-9796 e-mail: info@galaxypwr.com
GHBW53V08 OPERATION
Power Dissipation
35
30
25
20
15
10
5
0
0
6
8
Output Current (A)
Power Dissipation (W)
38V Vin
42V Vin
48V Vin
4
3
2
1
5
7
Efficiency
95
94
93
92
91
90
89
88
87
86
85
0
6
8
Output Current (A)
Ef
ficiency (%)
38V Vin
42V Vin
48V Vin
4
5
7
2
1
3
Line/Load Regulation
54.0
53.8
53.6
53.4
53.2
53.0
52.8
52.6
52.4
52.2
52.0
0
3
5
6
Output Current (A)
Output V
oltage (V)
38V Vin
42V Vin
48V Vin
4
1
2
7
8
Output Enable
Conditions: Vin = 42V, Iout = 8A
1) Vout 10V/div 10mS/div
2) Enable 2V/div
CH1
CH2
Output Enable
Conditions: Vin = 42V, Iout = 0A
1) Vout 10V/div 10mS/div
2) Enable 2V/div
CH1
CH2
Overvoltage Protection
Conditions: Vin = 42V, Iout =1A
0 2 4 6 8 10 12 14 16 18 20
V
out (V)
70
60
50
40
30
20
10
-10
Time (ms)
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