PKM4111DPINB Ericsson Power Modules, PKM4111DPINB Datasheet - Page 17

• Manufacturer Part Number: PKM4111DPINB
• Description: Module DC-DC 1-OUT 5V 25A 125W 8-Pin Quarter-Brick Box
• Manufacturer: Ericsson Power Modules
• Type: Step Downr
• Series: PKM-Dr

Specifications of PKM4111DPINB

• Package: 8Quarter-Brick
• Output Current: 25 A
• Output Voltage: 5 V
• Input Voltage: 36 to 75 V
• Number Of Outputs: 1
• Output Power: 125 W
• Product: Isolated
• Input Voltage Range: 36 V to 75 V
• Output Voltage (channel 1): 1.5 V
• Output Current (channel 1): 20 A
• Isolation Voltage: 1.5 KV
• Package / Case Size: Quarter Brick
• Output Type: Isolated
• Lead Free Status / Rohs Status: Details

Thermal Consideration continued
Definition of reference temperature (T
The reference temperature is used to monitor the temperature
limits of the product. Temperatures above maximum T
not allowed and may cause degradation or permanent
damage to the product. T
temperature range for normal operating conditions.
T
margins, proper operation and high reliability of the module.
Ambient Temperature Calculation
By using the thermal resistance the maximum allowed
ambient temperature can be calculated.
1. The power loss is calculated by using the formula
((1/η) - 1) × output power = power losses (Pd).
η = efficiency of converter. E.g 90 % = 0.90
2. Find the thermal resistance (Rth) in the Thermal Resistance
graph found in the Output section for each model.
Calculate the temperature increase (ΔT).
3. Max allowed ambient temperature is:
Max Tref - ΔT.
E.g PKM 4110D PINB 53v full load at 2m/s:
1.
2. 14.2 W × 4°C/W = 56°C
3. 110 °C - 56°C = max ambient temperature is 54°C
The real temperature will be dependent on several factors, like
Pcb size and type, direction of airflow, air turbulence etc.
It is recommended to verify the temperature by testing.
E
ΔT = Rth x Pd
ESKEVIN
Approved
SEC/D (Julia You)
PKM 4000D PINB series Direct Converters
Input 36-75 V, Output up to 40 A/120 W
ref
((
is defined by the design and used to guarantee safety
0.89
1
) -
1) × 115 W = 14.2 W
ref
is also used to define the
ref
)
Checked
EYINGJI
ref
are
Connections
3/1301-BMR 637 02 Uen
Date
2007-12-10
Pin
1
2
3
4
5
6
7
8
Designation
+In
RC
- In
- Out
- Sen
Vadj
+ Sen
+ Out
Technical Specification
EN/LZT 146 306 R4D December 2009
© Ericsson AB
Rev
B
Top View
Reference
Function
Positive input
Remote control
Negative input
Negative output
Negative remote sense
Output voltage adjust
Positive remote sense
Positive output
17