PISCES Series
Very High Efficiency DC/DC Converter
24/48V Input, 1.5V, 1.8V, 2.0V, 2.5V, 3.3V DC, 30A Output
or 5.0V DC, 20A Output
The Pisces Series is the first high-efficiency
quarter brick CoolConverter™ in the Galaxy
family of high-efficiency DC/DC converters.
The open-frame Pisces is available with an optional
baseplate or low profile heatsink for maximum
thermal performance.
Industry Standard Pinout and Footprint
Typical Efficiency
92% at 3.3V, 15A; 90% at 3.3V, 30A
No Heat Sink Required
Very Low Common-mode Noise for a
Commercial DC/DC Converter
Two-stage Input Filter
Constant Switching Frequency
Remote Sense
Single Board Design
Optional Baseplate or Low Profile Heatsink for
Improved Thermal Performance
Header with M3 Metal Inserts for Mechanical
Connection to PCB
Two Year Warranty
Control Functions
Uses Patented Power Supply Control
and Architecture
Microprocessor Controlled
Primary-side Enable, Choice of Logic
Protection Features
Over Temperature Protection
Over Voltage Protection
Over Current Protection
Over/Under Input Voltage Protection
Typical Characteristics
Output Setpoint Accuracy: ±1%
Load Regulation: ±0.2%
Line Regulation: ±0.2%
Regulation over Line, Load, and Temperature: ±2%
Low Output Ripple
Output Trim
Pisces Series, Page 1
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Part No. 99-002 Rev. 4.0–093003
General Specifications
VIN = 48VDC, TA@25°C, 300 LFM Airflow, VOUT=3.3V, IOUT = Full Load unless otherwise noted.
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
36
48
75
VDC
5
A
Input Current (Model Dependent)
Input Capacitance
Input Hysteresis, Low Line
4.5
µF
2
VDC
Output Characteristics
Regulation Over Line, Load & Temperature
98
102
%VNOM
Voltage Ripple
20
mV RMS
Voltage Ripple, 20MHz BW
150
mV P–P
Current Range
0
30
A
Current Limit Inception
31
37
A
Short Circuit Current, Peak (see Note below)
41
A
Output Transient Response, 50% to 75% load change, 1A/µsec
5
%VOUT
Settling Time to ±1%
300
µS
Turn-on Time to 98%Vnom
35
mS
Output Overshoot at Turn-on
1
%VOUT
110
%VOUT
Trim Range
90
Overvoltage Protection, Latching
130
%VOUT
Isolation
Isolation Test Voltage, Input/Output (Basic)
2000
VDC
10
MΩ
Isolation Resistance
Features
Overtemperature Protection, Thermal Sensor, Latching*
°C
117
Switching Frequency, Fixed
200
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
General Specifications
Approvals and Standards
Operating Temperature
-40°C to +100°C
Storage Temperature
-55°C to +125°C
Relative Humidity
Vibration
10% to 95% RH,
Non-condensing
2 to 9Hz, 3mm disp.,
9 to 200Hz 1g
Material Flammability
Weight
MTBF
UL V-0
35 grams
Telcordia (Bellcore)
Pisces Series, Page 2
UL and c-UL Recognized Component, TUV,
UL60950, CSA 22.2 No. 950, IEC/EN 60950**
EMC Characteristics:
Designed to meet emission and immunity
requirements per EN55022, CISPR 22, Class B,
and CISPR 24.
** An external fuse shall be used to comply with the
requirements.
1,600,000 hours
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Part No. 99-002 Rev. 4.0–093003
Application Notes
CoolConverter™
Galaxy’s proprietary CoolConverter™ provides:
• 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.
• Low common-mode noise as a result of lower capacitance
in the transformer compared to planar magnetics and
metal baseplate designs.
• Higher reliability than planar transformer designs that can
suffer from via fatigue from thermal cycling, and metal
baseplate designs with board to board interconnects that
are subject to mechanical stress on electrical connections.
Protection and Control
Overvoltage Lockout
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.
Input Current
Valid Input Voltage Range:
Voltage
Rising
Voltage
Falling
75
Pisces Series, Page 3
77
78
79
80
Input Voltage (V)
ON/OFF Logic Option:
Undervoltage Lockout
Input Current
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 1.0 V
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.
76
Voltage
Rising
Voltage
Falling
30
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32
34
36
38
40
Input Voltage (V)
Part No. 99-002 Rev. 4.0–093003
Application Notes
Output Over Voltage Protection:
Trim:
The output voltage is constantly monitored by the
microprocessor and a redundant secondary-side crowbar
circuit that is set to a higher trip point than the
microprocessor protection. 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 advanced feature prevents
the converter from damaging the load if there is a
converter failure or application error. If non-latching is
required, consult factory.
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
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.
Control Options:
Trim-down (%)
RTRIM-DOWN =
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.
{
100
–2
∆%
}
5.11kΩ
Trim-up (for 3.3V)
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 10% of
Vout, whichever is greater.
RTRIM-UP =
{
}
Vo (100+∆%) (100+2∆%)
−
1.225∆%
∆%
5.11kΩ
Safety:
An external input fuse must always be used to meet
these safety requirements.
External Output Trimming
+ Sense
Trim
– Sense
Pisces Series, Page 4
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Part No. 99-002 Rev. 4.0–093003
GHPW3V3–30 Operation
Efficiency
Power Dissipation
94
Power Dissipation (W)
14
Efficiency (%)
92
90
36V Vin
48V Vin
75V Vin
88
86
84
82
12
10
36V Vin
48V Vin
75V Vin
8
6
4
2
0
80
0
10
5
15
20
30
25
0
5
10
Output Current (A)
15
20
25
30
Load Current (A)
Output Voltage vs Line Load
Output Voltage (V)
3.5
3.0
2.5
36V Vin
48V Vin
75V Vin
2.0
1.5
1.0
0.5
0
28
30
32
34
36
38
40
42
Output Current (A)
Transient Response
Voltage Ripple
VOUT
VOUT
20
IOUT
10
Thermal Derating Curves
Start-up Waveform w/No Load
[
]
T
35
T
30
VOUT
Iout (A)
25
2
20
300 LFM, Low Profile Heat Sink
15
300 LFM, Metal Plate
ON/OFF
200 LFM, Low Profile Heat Sink
10
300 LFM, Open Frame
1
200 LFM, Metal Plate
5
200 LFM, Open Frame
0
Ch1 5.00V
Ch2
1.00 V
M 4.00ms A
Ch1
2.40V
20
30
40
50
60
70
80
Ambient Air Temperature (deg C)
Pisces Series, Page 5
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Part No. 99-002 Rev. 4.0–093003
PACKAGE DETAIL
2.28
MOUNTING INSERT
CONNECTED TO CASE PIN
Pin Configuration — Bottom View
1.030
1.030
PIN 1
0.815
1.45 PIN 2
0.515
PIN 3
0.215
0.815 PIN 8
PIN 7
0.515 PIN 6
0.365 PIN 5
PIN 4
A
A
A
0
.210
0
BOTTOM VIEW
MOUNTING INSERT
M3 X 0.5 4 PLACES
.210
0
1.860
0.070
2.000
PIN TO PIN
Pin
Function
Pin Dia. (in.)
1
2
3
4
5
6
7
8
– Input
On/Off
+ Input
+ Output
+ Sense
Trim
– Sense
– Output
0.040
0.040
0.040
0.060
0.040
0.040
0.040
0.060
Notes:
0.50
0.50
(opt. L = 0.465)
0.010 ±0.008
0
SIDE VIEW
1. Mechanical tolerances
x.xxx in. = ±0.005 in.
x.xx in. = ±0.01 in.
2. Pin material: brass with tin/lead plating over nickel
3. Workmanship: Meets or exceeds IPC-A-610B Class II
4. "A" = 0.040" dia pins
5. "B" = 0.060" dia pins
0.20
Pisces Series, Page 6
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Part No. 99-002 Rev. 4.0–093003
ORDERING INFORMATION
Standard Model
Number
Output
Voltage
Max
Current
48V Input Models (Designated W)
GHPW5V020*
5.0V
20A
GHPW3V330*
3.3V
30A
GHPW2V530*
2.5V
30A
GHPW2V030*
2.0V
30A
GHPW1V830*
1.8V
30A
GHPW1V530*
1.5V
30A
Typical Efficiency
Half Load
Full Load
91%
92%
90%
89%
88%
86%
90%
90%
87%
85%
84%
82%
Standard Model
Number
Output
Voltage
Max
Current
24V Input Models (Designated C)
GHPC5V020*
5.0V
20A
GHPC3V330*
3.3V
30A
GHPC2V530*
2.5V
30A
GHPC2V030*
2.0V
30A
GHPC1V830*
1.8V
30A
GHPC1V530*
1.5V
30A
Typical Efficiency
Half Load
Full Load
90%
91%
89%
88%
87%
85%
88%
89%
86%
84%
83%
81%
* Options:
P = Positive Logic Version; High = On
E = 0.18" Pins (±0.01")
M = 0.145" Pins (±0.01")
S = 0.12" Pins (±0.01")
R = Heatsink Ready
T = Tuned model**
L = Low Profile (0.465" height – open frame only)
Ordering Information
Example Part No.:
GHPW3V330
48V input
3.3V@ 30A output
Negative Logic
0.20" Pin Length
Open Frame
Heatsink Part Numbers
Options Code:
(All options shown)
GHPW 3V330 P S R T 00X L
Part Number
(from chart above)
Options:
Positive Logic Version
Optional Pin Lengths
E = 0.18"
M = 0.145"
S = 0.12"
Heatsink-ready
Tuned Model
Heatsink
001 = 0.25"
002 = 0.50"
003 = 1.00"
004 = 0.13"
005 = 0.70"
Low Profile (0.465" height)
Part
Number
Height
Typical Thermal Performance
Natural Convection
Forced Convection
Power Dissipation*
Thermal Resistance**
001
0.25"
5W
5.8°C/W
002
003
004
0.50"
1.00"
0.13"
7W
11W
TBD
3.2°C/W
2.0°C/W
TBD
005
0.70"
TBD
*@ 60°C rise heatsink to ambient
TBD
** @ 300'/min.
**T (Tuned Model) Option
Designed for higher di/dt and ∆I applications, the
transient response has been modified to take advantage
of the capacitance on the customer's PCB. This unit
requires a minimum load capacitance of 5600µF with an
impedance magnitude of less than 0.005Ω at 15kHz. It
offers a minimum 3X improvement in the peak response
compared to a standard unit.
Galaxy Power Inc. warrants to the original purchaser that the products conform to this data
sheet and are free from material and workmanship defects for a period of two (2) years from
the date of manufacture, if this product is used within specified conditions. Galaxy Power Inc.
reserves the right to make changes to the product(s) or information contained herein without
notice. No liability is assumed as a result of their use or application. No rights under any
patent accompany the sale of any such products or information. For additional details on this
limited warranty consult the factory.
155 Flanders Road Westborough, MA 01581
508-870-9775 Fax: 508-870-9796
e–mail: [email protected]
website: http://www.galaxypwr.com
Pisces Series, Page 7
Part No. 99-002 Rev. 4.0–093003
© Copyright 2003 Galaxy Power. Specifications subject to change without notice.
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