STW20NK50Z - N-channel SuperMESH™ Power MOSFET

STW20NK50Z	TO-247 Package	Symbol
	1. GATE 2. DRAIN 3. SOURCE

WHAT IS STW20NK50Z?

This STW20NK50Z device is an N-channel Zener-protected Power MOSFET developed using STMicroelectronics’ SuperMESH™ technology. In addition to a significant reduction in on state resistance, this device is designed to ensure a high level of dv/dt capability for the most demanding applications.

Low on state resistance makes it suitable for power electronics converters utilized in power conversion & control. High dv/dt capability makes it superior in high voltage applications like photovoltaic power generations and VFDs.

PIN CONFIGURATION

Table 1

PIN NUMBER	PIN NAME	DESCRIPTION
1	Gate	Controls the biasing of the MOSFET
2	Drain	Current flows in through Drain
3	Source	Current flows out through Source

Table of Contents

FEATURES

Extremely high dv/dt capability
100% avalanche tested
Gate charge minimized
Very low intrinsic capacitance

ALTERNATIVES FOR STW20NK50Z

Table 2

TRANSISTOR TYPE		ON_MAX
STW20NK50Z	500 V	0.27 Ω	20 A	190 W
STW32N55M5	550 V	0.1 Ω	29 A	190 W
STW32NM50N	500 V	0.13 Ω	22 A	190 W
STW33N60M2	600 V	0.125 Ω	26 A	190 W
STW34NM60N	600 V	0.105 Ω	31.5 A	250 W

APPLICATION

High Current, High Speed Switching
Ideal for Off-Line Power Supplies, Adaptors And PFC

WHERE TO USE STW20NK50Z? | WORKING OF STW20NK50Z

Major load of industrial sectors are VFDs. Efficiency of VFDs depends on the converters used to drive the motors. Low on state resistance of STW20NK50Z reduce conduction losses and makes VFDs efficient. So low on state resistance along with high dv/dt in STW20NK50Z makes it perfect choice for VFDs.

PACKAGE MECHANICAL DATA

Table 3

Dim.	mm
Dim.	Min.	Typ.	Max.
A	4.85		5.15
A1	2.20		2.60
b	1.0		1.40
b1	2.0		2.40
b2	3.0		3.40
c	0.40		0.80
D	19.85		20.15
E	15.45		15.75
e		5.45
L	14.20		14.80
L1	3.70		4.30
L2		18.50
P	3.55		3.65
R	4.50		5.50
S		5.50

Dimentional View

HOW TO USE STW20NK50Z

STW20NK50Z MOSFET can be use in any power electronics circuit like inverter, DC-DC converter or controlled rectifier. As mentioned previously STW20NK50Z has three terminals Gate(G), Drain(D) and Source(S). Drain and Source are called power terminals whereas Gate terminal is known as control terminal. As shown in fig. gate pulses need to be provided between Gate and Source to turn on the MOSFET. Maximum current carrying capacity of STW20NK50Z is 20A hence, one can utilize this MOSFET in an application which require current flow of lesser than 20A.

Use of STW20NK50Z

To use STW20NK50Z in DC/DC Converters or Multilevel Inverters, driver ICs like TLP250 or IR2101 are required. Circuit diagram of STW20NK50Z along with driver TLP250 is shown in Fig.6. MOSFET Drivers are used to fulfill two objectives 1) to provide isolation (to control circuit from power circuit). 2) to amplification (5V pulse/3.3 V pulse from controller amplifies to >10V to effectively drive MOSFET). As shown in fig.6 TLP250 has inbuilt optocoupler along with two transistor amplification circuit. Pin configuration and appropriate connections are summarized in Table.4.

STW20NK50Z along with TLP250

Table 4 Connection of TLP250 with STW20NK50Z

Pin Number	Pin Name	Connection	Description
2	Anode	To the output pin of controller	Input pulse of 3.3 V/5V to the driver circuit
3	Cathode	To the ground of controller	Ground of input side circuit
8		To the isolated supply with output voltage >10 V	Supply for driver circuit
5	GND	To the GND of isolated supply	Ground of external driver supply
6,7	OUTPUT	To the Gate of STW20NK50Z. (Resistor is connected to limit the gate current)	6 and 7 pins are internally shorted and provide amplified pulse provided at pin 2.

STW20NK50Z RELATED PRODUCTS PRICE

Parts	Mfr.	Description	Stock	Prices
STW20NK50Z	ST	MOSFET N-CH 500V 17A TO-247	3900	$0.869 Lowest
STW20N95K5	ST	MOSFET N-CH 950V 17.5A TO-247	120	$3.982 Lowest
STW20NM60	ST	MOSFET N-CH 600V 20A TO-247	69	$1.322 Lowest