PKM4610PI Ericsson Power Modules, PKM4610PI Datasheet - Page 47

• Manufacturer Part Number: PKM4610PI
• Description: DC/DC Power Supply Single-OUT 3.3V 20A 66W 8-Pin Quarter-Brick
• Manufacturer: Ericsson Power Modules
• Type: Step Downr
• Series: PKMr

Specifications of PKM4610PI

• Package: 8Quarter-Brick
• Output Current: 20 A
• Output Voltage: 3.3 V
• Input Voltage: 36 to 75 V
• Number Of Outputs: 1
• Output Power: 66 W
• Product: Isolated
• Input Voltage Range: 36 V to 75 V
• Output Voltage (channel 1): 3.3 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: Lead free / RoHS Compliant

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 89.5 % = 0.895
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 PKM4719API at 2m/s:
1.
2. 9.94 W × 2.49°C/W = 24.75°C
3. 110 °C — 24.75°C = max ambient temperature is 85.25°C
The actual temperature will be dependent on several factors
such as the PCB size, number of layers and direction of
airflow.
ΔT = Rth x Pd
Prepared (also subject responsible if other)
ESECZHW
Approved
SEC/D (Linda Zhong)
PKM 4000 PI series
DC/DC converters, Input 36-75 V, Output 35 A/126 W
ref
((
is defined by the design and used to guarantee safety
0.883
1
) -
1) × 75 W = 9.94 W
ref
is also used to define the
ref
)
Checked
MICJOHN
ref
are
Connections
PRODUCT SPECIFICATION
No.
3/1301-BMR631
Date
2006-02-22
Pin
1
2
3
4
5
6
7
8
Designation
+In
RC
-In
-Out
-Sen
Vadj
+Sen
+Out
Technical Specifi cation
EN/LZT 146 310 R1B Nov 2006
© Ericsson Power Modules 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
5 (6)
47