Powersolve PS75 User Manual

High Density DC-DC Modules

PS75 Series

www.powersolve.co.uk

37.5 - 75 Watt Wide Input
DC-DC Converters
Single Output

Features

• 37.5W - 75W Isolated Output

• Efficiency to 86%

• 300KHz Switching Frequency

• 2 : 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 - 18V (PS75-12Sxx models)

Undervoltage Lockout 8.8V (PS75-12Sxx 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 ±1.0% max.
Transient Response: 25% Step Load Change <500µSec
External Trim Adj. Range ±10%
Ripple & Noise, 20MHz BW [3] 20mV RMS max, 75mV pk-pk max (2.5V, 3.3V & 5V outputs)

ENVIRONMENTAL

Temperature coefficient ±0.03%/°C
Short Circuit Protection Continuous
Line Regulation [1] ±0.2% max
Load Regulation [2] ±0.2% max
Over Voltage Protection trip range, % Vo nom. 115% - 140%
Current Limit 110% - 150% 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 400KHz typ. (12V & 24V input models)

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 (2.28 x 2.40 x 0.50 inches)
Case Material Aluminium

NOTE:

1. Measured from High Line to Low Line.

2. Measured from Full Load to No Load.

3. Output noise and ripple measured with 10µF tantalum & 1.0µF ceramic capacitors across output.

18 - 36V (PS75-24Sxx models)
36 - 75V (PS75-48Sxx models)

8.0V (PS75-12Sxx power down)
17V (PS75-24Sxx power up)
16V (PS75-24Sxx power down)
34V (PS75-48Sxx power up)

32.5V (PS75-48Sxx power down)

Add suffix N to model number for Negative Logic Remote ON/OFF control

30mV RMS max, 100mV pk-pk max (12V & 15V outputs)
100mV RMS max, 240mV pk-pk max (24V output)

300KHz typ. (48V input models)

Powersolve Electronics Ltd. 8A Arnhem Road, Newbury, RG14 5RU. England

Tel: [phone] Fax: [phone] Email: [e-mail]

High Density DC-DC Modules

www.powersolve.co.uk

Output Voltage and Current Ratings

MODEL INPUT OUTPUT OUTPUT INPUT CURRENT % EFF.

PS75-12S25 9-18VDC 2.5 VDC 15A 50mA 4110mA 76
PS75-12S33 9-18VDC 3.3 VDC 15A 50mA 5290mA 78
PS75-12S05 9-18VDC 5 VDC 15A 50mA 7715mA 81
PS75-12S12 9-18VDC 12 VDC 6.25A 50mA 7440mA 84
PS75-12S15 9-18VDC 15 VDC 5A 50mA 7440mA 84
PS75-12S24 9-18VDC 24 VDC 3.13A 50mA 7440mA 86
PS75-24S25 18-36VDC 2.5 VDC 15A 50mA 2029mA 77
PS75-24S33 18-36VDC 3.3 VDC 15A 50mA 2610mA 79
PS75-24S05 18-36VDC 5 VDC 15A 50mA 3810mA 82
PS75-24S12 18-36VDC 12 VDC 6.25A 50mA 3675mA 85
PS75-24S15 18-36VDC 15 VDC 5A 50mA 3675mA 85
PS75-24S24 18-36VDC 24 VDC 3.13A 50mA 3640mA 86
PS75-48S25 36-75VDC 2.5 VDC 15A 50mA 1015mA 77
PS75-48S33 36-75VDC 3.3VDC 15A 50mA 1305mA 79
PS75-48S05 36-75VDC 5VDC 15A 50mA 1883mA 83
PS75-48S12 36-75VDC 12VDC 6.25A 50mA 1838mA 85
PS75-48S15 36-75VDC 15VDC 5A 50mA 1838mA 85
PS75-48S24 36-75VDC 24VDC 3.13A 50mA 1820mA 86

NOTE: Nominal Input Voltage 12, 24 or 48VDC

VOLTAGE VOLTAGE CURRENT NO LOAD FULL LOAD

Mechanical and Connection Details

All dimensions in inches (mm)
Tolerances Inches x.xx ±0.02 x.xxx ±0.010

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 PS75 Series allows the user to switch the module on and off electronically with the remote on/off feature.
The PS75 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: [phone] Fax: [phone] Email: [e-mail]

High Density DC-DC Modules

www.powersolve.co.uk

External Output Trim

The output can be trimmed externally (±10%) using a fixed resistor or
a trimpot as shown.

The output noise is measured with a 10µF tantalum and a 1.0µF
ceramic capacitor across the output.

Output Noise

Application Note

Derating:
The case operating temperature range of the PS75 series is -40°C to +100°C. When operating the PS75 series, proper derating or
cooling is required.

Following is the derating curve for the PS75 without a heatsink; airflow along width (transverse).

Where:

The power dissipated (Pd):
Pd = Pi - Po = Po (1-n) / n

The thermal resistances are listed below:

Chart of Thermal Resistance vs Air Flow:

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: [phone] Fax: [phone] Email: [e-mail]

The temperature rise (∆T):

∆T = Pd * Rca