BOLERO HV Series
48V Input, 52VDC, 4A Output
The Bolero HV half brick is a High Power
CoolConverter
™
in the Galaxy family of
high-efficiency DC/DC converters.
Industry Standard Pinout and Footprint
Typical Efficiency:
93% at 52V, 4A; 91% at 52V, 2A
No Heat Sink Required (Baseplate Standard)
Very Low Common-mode Noise for a
Commercial DC/DC Converter
Two-stage Input Filter
Constant Switching Frequency, 330kHz
Remote Sense
Single Board SMT Construction
Low Profile, 0.4"
Optional Low Profile Heatsink
for Improved Thermal Performance
Header with M3 Metal Inserts for Mechanical
Connection to PCB
Two Year Warranty
Low profile single board layout provides
high reliability and metal baseplate
improves thermal performance by >10°C
over open frame designs.
Control Functions
Optional Droop Current Sharing
Microprocessor Controlled
Primary-side Enable, Choice of Logic
Protection Features
Over Temperature Protection
Over Voltage Protection
Over/Under Input Voltage Protection
Over Current Protection
Typical Characteristics
Output Setpoint Accuracy:
±1%
Load Regulation:
±0.25%
Line Regulation:
±0.25%
Regulation over Line, Load, and Temperature:
±2%
Low Output Ripple
Industry Standard Output Trim
Bolero HV Series, Page 1
PRODUCT PREVIEw
Part No. 02–004 Rev. 1.9.5–102502
General Specifications
V
IN
= 48V
DC
, T
A
@25
°
C, 300 LFM airflow, V
OUT
= 52V, I
OUT
= Full Load unless otherwise noted. C
OUT
= 180
µ
F 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 Input Voltage
Input Current (Model Dependent)
Input Capacitance
Input Hysteresis, Low Line
36
48
4.0
2
75
7.0
V
DC
A
µF
V
DC
%V
NOM
V
DC
mV
RMS
mV
P–P
A
A
A
µS
mS
%V
OUT
%V
OUT
%V
OUT
**
V
DC
MΩ
Output Characteristics
Regulation Over Line, Load & Temperature
Optional Droop, No Load to Full Load
Voltage Ripple
Voltage Ripple, 20MHz BW
Current Range
Current Limit Inception
Short Circuit Current, Peak (see Note below)
Settling Time to
±1%
Turn-on Time to 98% Vnom
Output Overshoot at Turn-on
Trim Range
Overvoltage Protection, Latching
98
102
2
30
200
4
5.0
6
300
30
1
105
115
2250
10
120
330
0
4.2
50
Isolation
Isolation Test Voltage, Input/Output (Basic)
Isolation Resistance
Features
Overtemperature Protection, Thermal Sensor, Latching*
Switching Frequency, Fixed
°C
kHz
Notes: During short circuit, converter will shut down and attempt to restart once per second.
The average current during this condition will be very low and the device can be safely left in this condition
continuously. For specific output voltage specifications, see the corresponding detailed data sheet.
*PCB less than 130
°
C.
**OVP set to limit maximum voltage in system to a safe level. This can be adjusted for higher voltages if needed.
General Specifications
Operating Temperature, Baseplate
Storage Temperature
Relative Humidity
Vibration
Material Flammability
Weight
MTBF
Telcordia (Bellcore)
-40°C to +100°C
–55°C to +125°C
10% to 95% RH,
Non-condensing
2 to 9Hz, 3mm disp.,
9 to 200Hz 1g
UL V-0
55 grams
1,600,000 hours
Approvals and Standards
UL and c-UL Recognized Component,
TUV, UL60950, 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.
Bolero HV Series, Page 2
PRODUCT PREVIEw
Part No. 02–004 Rev. 1.9.5–102502
Application Notes
CoolConverter
™
Family
Galaxy’s
C
OOL
C
ONVERTERS
™
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.
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 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 below
1.0V with respect to the –INPUT pin to enable the
converter. For Positive logic, the ON/OFF pin is
brought to greater than 4.0V with respect to the
Enable. To request the Positive logic version, add
the suffix (P) to the standard part number. The
Input pin has a built-in pull-up resistor of
approximately 100kΩ to +5.0V.
Bolero HV Series, Page 3
PRODUCT PREVIEw
Part No. 02–004 Rev. 1.9.5–102502
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 the ON/OFF pin or power to
the converter. This feature prevents the converter
from damaging the load if there is a converter
failure or application error. If non-latching is
required, consult factory.
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 shutdown is required, consult
factory.
Control Options:
As the behavior of the circuit is determined by
firmware in the microcontroller, specific customer
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 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 0.4V
or 2% of Vout, whichever is greater.
Safety:
An external input fuse must always be used to
meet safety requirements.
Trim-down (%)
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,
connect the required trim resistor from the Trim pin
to the –Sense pin. See diagram below.
Trim-down
R
TRIM-DOWN
=
{
100
– 2 kΩ
∆%
}
Trim-up (for 3.3V)
Trim-up (%)
R
TRIM-UP
=
{
Vo (100+∆%) (100+2∆%)
–
1.225∆%
∆%
}
kΩ
External Output Trimming
+ Sense
Trim
– Sense
Bolero HV Series, Page 4
PRODUCT PREVIEw
Part No. 02–004 Rev. 1.9.5–102502
GPBW52V04R OPERATION
Efficiency
94
Power Dissipation
Efficiency (%)
90
88
86
84
82
80
0
1
2
3
4
40V Vin
48V Vin
60V Vin
Power Dissipation (W)
92
36V Vin
48V Vin
75V Vin
Load Current (A)
Load Current (A)
Start-up Waveform
[
T
T
Voltage Ripple
[
]
]
Ch1 Pk–Pk
104.0mV
Ch1 RMS
16.38mV
1
V
OUT
2
Ch1
20.0V
BW
Ch2
5.00 V
BW
M 10.0ms A
Ch2
1.80V
100mV
1
32.0mV
Transient Reponse
1
CH1:
Vout Response
CH2:
Load (2A/div)
2
BW
50.0mV
BW
1.00ms
2
Bolero HV Series, Page 5
PRODUCT PREVIEw
Part No. 02–004 Rev. 1.9.5–102502
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