參數(shù)資料
型號(hào)： PMP5818UWSR
廠商： ERICSSON POWER MODULES AB
元件分類： 電源模塊
英文描述： 1-OUTPUT 88 W DC-DC REG PWR SUPPLY MODULE
封裝： ROHS COMPLIANT PACKAGE-11
文件頁(yè)數(shù)： 47/60頁(yè)
文件大?。?/td> 4072K
代理商： PMP5818UWSR
Ericsson Internal
PRODUCT SPECIFICATION
10 (13)
Prepared (also subject responsible if other)
No.
EYIPYAN
3/1301-BMR657 5818 Uen
Approved
Checked
Date
Rev
Reference
SEC/D (Julia You)
EQUENXU
2007-7-9
B
Thermal Consideration continued
Definition of reference temperature (T
ref)
The reference temperature is used to monitor the
temperature limits of the product. Temperatures above
maximum Tref are not allowed and may cause degradation
or permanent damage to the product. Tref is also used to
define the temperature range for normal operating
conditions.
Tref is defined by the design and used to guarantee safety
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 regulator. 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).
Δ
T = Rth x Pd
3. Max allowed ambient temperature is:
Max Tref - ΔT.
E.g PMP 5818UW P at 0m/s:
1. ((
) - 1) × 80 W = 6.39 W
2. 6.39 W × 15.8°C/W = 101.0°C
3. 130 °C – 101.0°C = max ambient temperature is 29.0°C
The actual temperature will be dependent on several factors
such as the PCB size, number of layers and direction of
airflow.
1
0.926
E
PMP 5000 series
PoL Regulator
Input 4.5 - 14 V, Output up to 16 A / 88 W
EN/LZT 146 388 R1B December 2009
Ericsson AB
Technical Specication
51
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