PKY4716PI Ericsson Power Modules, PKY4716PI Datasheet - Page 17

• Manufacturer Part Number: PKY4716PI
• Manufacturer: Ericsson Power Modules
• Type: Step Downr

Specifications of PKY4716PI

• Output Current: 25 A
• Output Voltage: 28 V
• Input Voltage: 36 to 75 V
• Number Of Outputs: 1
• Output Power: 700 W
• Switching Regulator: Yes

Ambient Temperature Calculation
For products with base plate the maximum allowed ambient
temperature can be calculated by using the thermal resistance.
1. The power loss is calculated by using the formula
((1/η) - 1) × output power = power losses (Pd).
η = efficiency of product. E.g. 93.3% = 0.933
2. Find the thermal resistance (Rth) in the Thermal Resistance
graph found in the Output section for each model. Note that
the thermal resistance can be significantly reduced if a
heat sink is mounted on the top of the base plate.
Calculate the temperature increase (∆T).
3. Max allowed ambient temperature is:
Max T
E.g. PKY 4716 PI at 2m/s:
1.
2. 50.27 W × 1.1°C/W = 55.3°C
3. 100 °C – 55.3°C = max ambient temperature is 44.7°C
The actual temperature will be dependent on several factors
such as the PCB size, number of layers and direction of
airflow.
The above calculations of the maximum ambient temperature
are based on the thermal resistance of the PKY module
without a heatsink.
∆T = Rth x Pd
Prepared (also subject responsible if other)
ESECZHW
Approved
SEC/D (Julia You)
PKY 4000 PI series
DC/DC converters, Input 36-75 V, Output up to 25 A/700 W
((
0.933
P1
1
- ∆T.
) -
1) × 700 W = 50.27 W
Checked
ECHWANG
Connections
PRODUCT SPECIFICATION
No.
3/1301- BMR 638/1 Uen
Date
2008-10-9
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Designation
+On/Off
-On/Off
+In
-In
AUX
PWR Good
Optional
Vadj
+Sense
-Sense
-Vout
-Vout
-Vout
+Vout
+Vout
+Vout
Technical Specifi cation
EN/LZT 146 380 R2A Oct 2008
© Ericsson Power Modules AB
Rev
C
Reference
Remote on/off “plus” input
Remote on/off “minus” input
Function
Positive input
Negative input
Auxiliary power supply output
Power Good output
N/A
Output Voltage Adjust
Positive remote sense
Negative remote sense
Negative output voltage
Negative output voltage
Negative output voltage
Positive output voltage
Positive output voltage
Positive output voltage
5 (6)
17