AN4406 datasheet(22/27 Pages) STMICROELECTRONICS

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Testing and comparing

AN4406

22/27

DocID025567 Rev 1

4.3.1

Purpose and description

This analysis tested and compared the electrical performance of the STP24N60M2 and

STP20N65M5 MOSFETs using the MDmesh™ M2 and MDmesh™ M5 technologies

respectively against well-known super-junction competitor devices A and B, when mounted

on a demo board (400 W LLC topology).

To perform the test, the devices were removed from the original position and soldered on

the back without a heat sink. All the measurements were performed at 25 °C ambient

temperature.

In order to obtain the waveforms of the main electrical parameters of the devices, small

wires loop were inserted on each pin.

Attention was focused on the electrical parameters of the MOSFETs, including voltage

across drain and source (VDS), current (ID) and voltage across gate to source (VGS).

The test sequence was with Vin =230 Vac and steady state at:

•

10% of the maximum load – IOUT(tot) fixed (0.371 A);

•

20% of the maximum load – IOUT(tot) fixed (0.742 A);

•

50% of the maximum load – IOUT(tot) fixed (1.855 A);

•

100% of the maximum load – IOUT(tot) fixed (3.71 A);

4.3.2

Main parameters

Device selection was based on electrical characteristics like V(BR)DSS, RDS(on) and package.

Table 4. ST super-junction technologies available on the market

Parameter

Test

conditions

STF13N60M2 STF15N65M5

Competitor

Unit

(1)V

(BR)DSS

Measured parameter

VGS =0 V,

ID =1 mA

640

713

700

635

(1)R

DS(on)

VGS =10 V,

ID =5.5 A

0.712

0.158

0.177

0.137

Ω

Vth

ID = 250 µA

2.9

4.1

3.1

3.7

Ciss

100 V / 100 V

/ 100 V / 25 V

1060

1434

1400

1600

Coss

100 V / 100 V

/ 100 V / 25 V

Crss

100 V / 100 V

/ 100 V / 25 V

2.2

3.7

8.2

VDD =520 V,

VGS =0 V

f = 1 MHz

3.5

8.5

2.5

Ω

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