PKB4213DPI datasheet(20/28 Pages) FLEX

20 / 28 page

Thermal Consideration

General

The products are designed to operate in different thermal

environments and sufficient cooling must be provided to

ensure reliable operation.

For products mounted on a PWB without a baseplate attached,

cooling is achieved mainly by conduction, from the pins to the

host board, and convection, which is dependant on the airflow

across the product. Increased airflow enhances the cooling of

the product. The Output Current Derating graph found in the

Output section for each model provides the available output

current vs. ambient air temperature and air velocity at

VI = 53 V.

The product is tested on a 254 x 254 mm, 35 µm (1 oz),

16-layer test board mounted vertically in a wind tunnel with a

cross-section of 608 x 203 mm.

For products with baseplate used in a sealed box/cold wall

application, cooling is achieved mainly by conduction through

the cold wall. The Output Current Derating graphs are found in

the Output section for each model. The product performance

has been tested in a sealed box presented in the figure below.

The ambient temperature (inside the box) has been set to

85°C. The cold wall temperature varied. See Design Note 028

for further details.

Definition of product operating temperature

The temperature at the positions (TP1, TP2) should not exceed

the maximum temperatures in the table below. The number of

measurement points may vary with different thermal design

and topology. Temperatures above maximum measured at the

reference point P1, P2 are not allowed and may cause

permanent damage.

Position

Description

Max Temp.

Mosfet, Reference point

TP1=125º C

Transformer core

TP2=125º C

Open frame

PKB4000D series Fully regulated DC-DC Converters

Input 36-75 V, Output up to 25 A / 300 W

28701-BMR674 01 Rev G

July 2019

Technical Speciﬁcation

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