MPM82 datasheet(10/15 Pages) SANKEN

10 / 15 page

SANKEN ELECTRIC CO., LTD.

2 A Non-Isolated Step-Down DC/ DC Converter Modules

MPM8x Series

March 11, 2013

MPM80-DS, Rev. 0.1

Thermal Derating

Figure 2. MPM80 thermal derating curve; measurement conditions: VO = 5 V, no heatsink

0.0

0.5

1.0

1.5

2.0

2.5

TA (°C)

-20

100

VIN = 12 V

VIN = 24 V

Figure 2 shows thermal derating curves for the MPM80. The

MPM80 requires derating based on the ambient temperature, TA,

in use.

Use the MPM80 within the thermal derating curves shown in

figure 2. If using the MPM80 outside the curves, consider using

a heatsink. In this case, the thermal resistance, RθJ-C , between the

MPM80 junction and case is 8 °C/W. Therefore, use the MPM80

at a junction temperature, TJ, of 125°C or less, with TJ calculated

using the following procedure.

1. The internal loss, PLOSS, of the MPM80 in use is calculated as

follows:

PLOSS = ( IIN × VIN ) – ( IO × VO)

(2)

where

PLOSS is the internal loss of the MPM80, in watts,

IIN is the input current of the MPM80, in amperes,

VIN is the input voltage of the MPM80, in volts,

IO is the output current of the MPM80 in amperes, and

VO is the output voltage of the MPM80, in volts.

Overall thermal resistance, RθJ-H, is determined by adding the

thermal resistances of the MPM80 and a heatsink, as follows:

RθJ-H = RθJ-C + RθH

(3)

where

RθJ-H is the thermal resistance between the MPM80 and heat-

sink, in degrees Celsius per watt,

RθJ-C is the thermal resistance between the MPM80 junction and

the MPM80 case, in degrees Celsius per watt, and

RθH is the thermal resistance of the heatsink, in degrees Celsius

per watt.

Junction temperature, TJ , is calculated as follows:

TJ = PLOSS × RθJ-H

(4)

Because the maximum TJ rating of the MPM80 is 125°C, please

use the MPM80 at a junction temperature of 125°C or less.

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