Primary Switch

The function of primary switch is to provide the high voltage, high frequency necessary to reduce the output of an AC-DC power supply. This is necessary to achieve high efficiency and reduce the size of the power supply. The various circuit topologies demand 2 basic characteristics of the HEXFET® power MOSFETs used in this application: low gate charge and low RDS(on). Dependent upon the power level, IGBTs as well as Power MOSFETs are used - fast switching WARP Speed™ IGBTs offer lowest losses for higher power applications.

International Rectifier has several product families that address AC-DC primary switched, dependent on the power level, performance and topology of the power supply.

International Rectifier Introduces Economical,
High Power, 150kHz IGBTs for High Frequency
SMPS Applications
Standard Series
High Performance Series
Fast Body Diode Series for ZVS Applications
Warp Speed IGBTs for Bridge Circuits
WARP2 IGBTs for High Power PFC and Primary Switch

Standard Series: Industry Standard Performance with Best Cost/Performance Ratio
Part Number
Package
BVDSS
RDS(on)
ID
Application
IRF730A/S TO-220/D2Pak 400V 1.0 ohm 5.5A Various
IRF740A/S TO-220/D2Pak 400V 0.55 ohm 10A Various
IRF820A/S TO-220/D2Pak 500V 3.0 ohm 2.5A Various
IRFB11N50A TO-220 500V 0.52 ohm 11A PFC+Dual Forward
IRFS11N50A D2Pak 500V 0.52 ohm 11A Various
IRFIB7N50A TO-220 Full-Pak 500V 0.52 ohm 6.6A Various
IRF830A/S TO-220/D2Pak 500V 0.42 ohm 12A Various
IRF840A/S TO-220/D2Pak 500V 0.85 ohm 8A Various
IRFP450A TO-247 500V 0.40 ohm 14A Flyback
IRFP460A TO-247 500V 0.27 ohm 20A Flyback
IRFP22N50A TO-247 500V 0.23 ohm 22A Flyback
IRFBC40A/S TO-220/D2Pak 600V 1.2 ohm 6.2A Various
IRFPC50A TO-247 600V 0.60 ohm 11A Various
IRFR1N60A D-Pak 600V 7.0 ohm 1.0A Various
IRFB9N60A TO-220 600V 0.75 ohm 9.2A Flyback
IRFIB6N60A TO-220 Full-Pak 600V 0.75 ohm 5.5A Flyback
IRFSL9N60A TO-262 600V 0.75 ohm 9.2A Flyback
IRFS9N60A D2Pak 600V 0.75 ohm 9.2A Flyback
IRFB9N65A TO-220 650V 0.93 ohm 8.5A Single Forward/Flyback
IRFIB5N65A TO-220 Full-Pak 650V 0.93 ohm 5.1A Single Forward/Flyback
FA57SA50LC SOT-227 500V 0.80 ohm 57A Power MOSFET module - high performance
FA38SA50LC SOT-227 500V 0.130 ohm 38A Power MOSFET module - standard
IRFPS37N50A Super-247™ 500V 0.130 ohm 36A Power MOSFET module - high performance
IRFBA22N50A Super-220™ 500V 0.230 ohm 22A Hard switching - high performance
IRFB13N50A TO-220 500V 0.450 ohm 22A Hard switching - standard
IRFR430A D-PAk 500V 1.700 ohm 4.5A Hard switching - standard
IRFU430A I-PAk 500V 1.700 ohm 4.5A Hard switching - standard
IRFR420A D-Pak 500V 3.000 ohm 2.5A Hard switching - standard
IRFU420A I-Pak 500V 3.000 ohm 2.5A Hard switching - standard
IRFBC40A TO-220 600V 1.200 ohm 6.2A Hard switching - standard
IRFBC30A/S D2Pak/TO-220 600V 2.200 ohm 3.6A Hard switching - standard
IRFRC20 D-Pak 600V 4.400 ohm 2A Hard switching - standard
IRFPE50 TO-247AC 800V 1.2 ohm 7.8A Hard switching - standard
IRFPE40 TO-247AC 800V 2 ohm 5.4A Hard switching - standard
IRFBE30 TO-220AB 800V 3 ohm 4.1A Hard switching - standard
IRFIBE30G TO-220FP iso 800V 3 ohm 2.1A Hard switching - standard
IRFPE30 TO-247AC 800V 3 ohm 4.1A Hard switching - standard
IRFBE20 TO-220AB 800V 6.5 ohm 1.8A Hard switching - standard
IRFIBE20G TO-220FP iso 800V 6.5 ohm 1.4A Hard switching - standard
IRFPF50 TO-247AC 900V 1.6 ohm 6.7A Hard switching - standard
IRFPF40 TO-247AC 900V 2.5 ohm 4.7A Hard switching - standard
IRFIBF30G TO-220FP iso 900V 3.7 ohm 1.9A Hard switching - standard
IRFPF30 TO-247AC 900V 3.7 ohm 3.6A Hard switching - standard
IRFBF20S D2Pak 900V 8 ohm 1.7A Hard switching - standard
IRFIBF20G TO-220AB 900V 8 ohm 1.2A Hard switching - standard
IRFPG50 TO-247AC 1000V 2 ohm 6.1A Hard switching - standard
IRFPG40 TO-247AC 1000V 3.5 ohm 4.3A Hard switching - standard
IRFBG30 TO-220AB 1000V 5 ohm 3.1A Hard switching - standard
IRFPG30 TO-247AC 1000V 5 ohm 3.1A Hard switching - standard
IRFBG20 TO-247AC 1000V 11 ohm 1.4A Hard switching - standard

High Performance Series: Up to 55% Improvement in RDS(on) over Industry Standard
Part Number Package BVDSS RDS(on) ID Application
IRFPS43N50K Super-247™ 500V 0.90 ohm 47A PFC Hard switching
IRFP32N50K TO-247 500V 0.160 ohm 32A PFC Hard switching
IRFB20N50K TO-220 500V 0.250 ohm 20A PFC Hard switching
IRFB18N50K TO-220 500V 0.290 ohm 17A PFC Hard switching
IRFPS40N60K Super-247™ 600V 0.130 ohm 40A PFC Hard switching
IRFP27N60K TO-247 600V 0.220 ohm 27A PFC Hard switching
IRFP22N60K TO-247 600V 0.280 ohm 22A PFC Hard switching

Fast Body Diode Series for ZVS Applications
Part Number Package BVDSS RDS(on) ID Application
IRFPS40N50L Super-247™ 500V 0.100 ohm 46A ZVS switching - benchmark
IRFPS35N50L Super-247™ 500V 0.145 ohm 34A ZVS switching - benchmark
IRFP31N50L TO-247 500V 0.180 ohm 31A ZVS - benchmark
IRFP23N50L TO-247 500V 0.235 ohm 23A ZVS - benchmark
IRFB17N50L TO-220 500V 0.320 ohm 16A ZVS - benchmark
IRFP17N50L TO-247 500V 0.320 ohm 16A ZVS - benchmark
IRFIB5N50L TO-220 Full-Pak 500V 0.800 ohm 5A ZVS - benchmark
IRFPS38N60L Super-247™ 600V 0.150 ohm 38A ZVS Switching - benchmark
IRFPS29N60L Super-247™ 600V 0.210 ohm 29A ZVS Switching - benchmark
IRFP26N60L TO-247 600V 0.250 ohm 26A ZVS Switching - benchmark
IRFP21N60L TO-247 600V 0.320 ohm 21A ZVS Switching - benchmark
IRFP15N60L TO-247 600V 0.460 ohm 15A ZVS Switching - benchmark
IRFB16N60L TO-220 600V 0.460 ohm 16A ZVS Switching - benchmark

Warp Speed IGBTs for Bridge Circuits
Part Number Package BVCES VCE(on) IC@ 25°C
IRG4IBC20W TO-220 Full-Pak 600V 2.6V 11.8A
IRG4BC20W TO-220AB 600V 2.6V 13A
IRG4IBC30W TO-220 Full-Pak 600V 2.7V 17A
IRG4BC30W TO-220AB 600V 2.7V 23A
IRG4BC30W-S D2Pak 600V 2.1V 23A
IRG4PC30W TO-247 600V 2.7V 23A
IRG4BC40W TO-220 600V 2.5V 40A
IRG4PC40W TO-247 600V 2.5V 40A
IRG4PC50W TO-247 600V 2.3V 55A
IRG4PF50W TO-247 900V 2.7V 51A

WARP2 IGBTs for High Power PFC and Primary Switch
Part Number Package BVDSS RDS(on) IC ID Application
IRGP50B60PD1 TO-220/TO-247 600V 0.61 ohm 50A 15A PFC Hardswitch benchmark
IRGP35B60PD TO-220/TO-247 600V 0.84 ohm 35A 15A PFC Hardswitch benchmark
IRGP20B60PD TO-220/TO-247 600V 0.158 ohm 20A 8A PFC Hardswitch benchmark
IRGP20B60PD TO-247 600V 0.158 ohm 20A 4A PFC Hardswitch benchmark

* MOSFET equivalent current
** Co-Pak diode current