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High Density DC-DC Modules
PS75W Series
www.powersolve.co.uk
37.5 - 75 Watt Wide Input
DC-DC Converters
Single Output
Features
• 37.5W - 75W Isolated Output
• Efficiency to 84%
• 300KHz Switching Frequency
• 4:1 Input Range
• Regulated Outputs
• Continuous Short Circuit Protection
• Five -Sided Metal Case
• Industry Standard Half-Brick Package
Electrical Specification
INPUT
Input Voltage Range 9-36V (24V nominal)
18-75V (48V nominal)
Undervoltage Lockout 8.8V (24Vin power up)
Positive Logic Remote ON/OFF Open collector ref. to -Input. Module ON: open circuit, Module OFF: <0.8VDC
Input Filter PI Type
OUTPUT
Voltage Accuracy ±1% max.
Transient Response: 25% Step Load Change <500msec
External Trim Adj. Range ±10%
Ripple & Noise, 20MHz BW 40mV RMS max, 100mV pk-pk max (3.3V & 5V outputs)
ENVIRONMENTAL
Temperature coefficient +0.03%/°C
Short Circuit Protection Continuous
Line Regulation ±0.2% max. measured over full input range
Load Regulation ±0.2% max. measured from 0-100% load
Over Voltage Protection trip range, % Vo nom. 115-140%
Current Limit 110%-160% Nominal Output
GENERAL
Efficiency See table
Isolation Voltage I/P-O/P, I/P-FG, O/P-FG: 1500VDC min
Isolation Resistance 107ohms min.
Switching Frequency 300KHz Typ.
Operating case Temperature -40°C to +100°C
Storage Temperature -55°C to +105°C
Thermal Shutdown, Case Temp. +100°C Typ.
Dimensions 57.9 x 61.0 x 12.7 mm (2.82 x 2.40 x 0.50 inches)
Case Material Aluminium
8.0V (24Vin power down)
17V (48Vin power up)
16V (48Vin power down)
Add suffix N to model number for Negative Logic Remote ON/OFF control
60mV RMS max, 150mV pk-pk max (12V & 15V outputs)
100mV RMS max, 240mV pk-pk max (24V output)
Powersolve Electronics Ltd. 8A Arnhem Road, Newbury, RG14 5RU. England
Tel: 01635 521858 Fax: 01635 523771 Email: [email protected]
Page 2
High Density DC-DC Modules
www.powersolve.co.uk
Output Voltage and Current Ratings
MODEL INPUT OUTPUT OUTPUT INPUT CURRENT % EFF.
PS75W-24S33 9-36 VDC 3.3 VDC 15A 50mA 2611mA 79
PS75W-24S05 9-36 VDC 5 VDC 15A 50mA 3811mA 82
PS75W-24S12 9-36 VDC 12 VDC 6.25A 50mA 3765mA 83
PS75W-24S15 9-36 VDC 15 VDC 5A 50mA 3720mA 84
PS75W-24S24 9-36 VDC 24 VDC 3.12A 50mA 3720mA 84
PS75W-48S33 18-75 VDC 3.3 VDC 15A 50mA 1289mA 80
PS75W-48S05 18-75 VDC 5 VDC 15A 50mA 1883mA 83
PS75W-48S12 18-75 VDC 12 VDC 6.25A 50mA 1860mA 84
PS75W-48S15 18-75 VDC 15 VDC 5A 50mA 1838mA 85
PS75W-48S24 18-75 VDC 24 VDC 3.12A 50mA 1835mA 85
NOTE: Nominal Input Voltage 24 or 48VDC
Mechanical and Connection Details
All dimensions in inches (mm)
Tolerances Inches x.xx ±0.02 x.xxx ±0.010
VOLTAGE VOLTAGE CURRENT NO LOAD FULL LOAD
Millimeters x.x ±0.5 x.xx ±0.25
Pin Function
1 +Vin
2 ON/OFF
3 CASE
4 -Vin
5 -Vout
6 -Sense
7 Trim
8 +Sense
9 +Vout
Remote ON/OFF Control
The PS75W Series allows the user to switch the module on and off electronically with the remote on/off feature.
The PS75W Series are available with “positive logic” or “negative logic” (option).
Logic Table
Logic State
(Pin 2)
Logic low-
Switch closed
Logic high-
Switch open
Negative
Logic
Module on Module off
Module off Module on
Pin Connection
Positive
Logic
All specifications typical at nominal line, full load and 25°C unless otherwise stated.
Powersolve Electronics Ltd. 8A Arnhem Road, Newbury, RG14 5RU. England
Tel: 01635 521858 Fax: 01635 523771 Email: [email protected]
Page 3
High Density DC-DC Modules
www.powersolve.co.uk
External Output Trim Output Noise
The output can be trimmed externally (±10%) using a fixed resistor or
a trimpot as shown.
Application Note
Derating:
The case operating temperature range of the PS75W series is -40°C to +100°C. When operating the PS75W series, proper derating or
cooling is required.
Following is the derating curve for the PS75W without a heatsink; airflow along width (transverse).
The output noise is measured with a 10µF tantalum and a 1.0µF
ceramic capacitor across the output.
Where:
The power dissipated (Pd):
Pd = Pi - Po = Po (1-n) / n
The thermal resistances are listed below:
AIR FLOW RATE TYPICAL Rca
Natural Convection 20ft/min. (0.1m/s) 7.12°C/W
100ft./min. (0.5m/s) 6.21°C/W
200ft./min. (1.0m/s) 5.17°C/W
300ft./min. (1.5m/s) 4.29°C/W
400ft./min. (2.0m/s) 3.64°C/W
500ft./min. (2.5m/s) 2.96°C/W
600ft./min. (3.0m/s) 2.53°C/W
700ft./min. (3.5m/s) 2.37°C/W
800ft./min. (4.0m/s) 2.19°C/W
Powersolve Electronics Ltd. 8A Arnhem Road, Newbury, RG14 5RU. England
Tel: 01635 521858 Fax: 01635 523771 Email: [email protected]
The temperature rise (∆T):
∆T = Pd * Rca
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