1kw buffered to220 irs2092 class d amp using modified iraudamp5 rev2d

IRS2092 : 1-kW Buffered IRFB4227 (TO220) Class D Amplifier using modified IRAUDAMP5

THD Performance Test

THD + N Ratio % vs. Output Power

Red plot : 4-ohm @ +/-68Vbus

Magenta & Yellow plot : 2-ohm @ +/-68Vbus

Cyan plot : 4-ohm @ +/-35Vbus

Red plot : 2-ohm @ +/-78Vbus

THD + N Ratio vs. Output Power


2-ohm @ +/-75Vbus

THD + N Ratio % vs. Output Power

Note : The THD variation 500W -1.2kW range is caused by the initial temperature of the mosfets before / during the sweep. The yellow plot is a cold start from ~25C. The rest of the plots are results from a warm board that has been repeatedly tested.


Low side R4 / R5 : 8k2 / 2k2 High side R3 / R2 : 8k2 / 2k2 Daughter Board#2 ( Idle self-osc freq : ~360kHz)

Daughter Board#3 ( Idle self-osc freq : ~349kHz)

+Peak Output Inductor current during Short Circuit Test for Ch1 : ~+75.5Apk

+Peak Output Inductor current during Short Circuit Test for Ch1 : ~-107.2Apk

+Peak Output Inductor current during short circuit test for Ch1 : ~+81.6 Apk

-Peak Output Inductor current during short circuit test for Ch2 : ~-95.4 Apk

The peak of the short circuit current is highly dependent on the interrelationship of the Rdson vs. junction temperature of the mosfets. The variation of the OCP current is deemed to be reasonable considering duration the daughter board is already running which warms up the board under test. The instantaneous OCP trip level is decided by the Ids and Rdson as a function of Tj. The ckt. designators R2/R3 and R4/R6 are referring to the OCP test portion of IRS20955 datasheet / appnote AN1138 for IRS2092.


Daughter Board#5 ( Idle self-osc freq : ~357kHz)

-Peak Output Inductor current during short circuit test for Ch2 : ~+70.35 Apk

-Peak Output Inductor current during short circuit test for Ch2 : ~-62.4 Apk


Top Side Component Overlay

Top Side Copper & Overlay

Bottom Side Copper & Component Overlay


Front View

Top Side (back view)

Bottom side


D4 R1

100R

R7

10R

R19

8.2k

R13

8.2K

R172.2k

D6

R910R

R30

10R

R32

10R

R5

3.3K

R412.2k

R43

8.2k

R2510K

C18

3.3uF

R4033k

+B

SD VCC

R124.7K

R3

10R

D1

VSS

VAA

GND1

10uFC10

R21

1k

C23

1nF,250V

C21

1nF,250V

CH1

R264.7R

C170.1uF

R371R

R52open

R50open

LO 11

VS 13

HO 14

VCC 12

GND2

VAA1

COM 10

DT 9OCSET8

IN-3

COMP4

CSD5

VSS6

VREF7

VB 15

CSH 16

U1

IRS2092S

C1

1nFC30

10nF

CH1 Output to LPF1

+75V Bus

+5V

-5V

Audio Gnd 1

SD

-75V Bus

IN-2

GND2

Audio Gnd 2

VAA

SD

VSS

VSS

IN-1

VCC

CH1 O

+B

-B

CH2

OC

C3

10uF

22uFC5

C12

3.3uF

TP1

Class D, 1kW Single Channel TO220 buffered Daughter Board IRS2092S Module Schematic

1234

5678

J2

A26570-ND

789

101112

J1

A26568-ND

Drawn by: ISRAEL SERRANO

R46

3.01k

P1 1K

SCH_DB_2092_Rev8

-B

+75V Bus

--75V Bus

CH1

TP1

Q6AIRFB4227

Q5A

IRFB4227

Q6BIRFB4227

Q5B

IRFB4227

Q8ZXTP25100BFH

Q2

ZXTP25100BFH

Q9ZXTN25100BFH

Q3

ZXTN25100BFH

C31

100nF

C33100nF

VB

DS1

-B

-B

R21A10R

R20A

10K

R21B10R

R20B

10K

R23A10R

R23B10R

R22A

10K

R22B

10K

R44

10R

R45 10R

R44A OPEN

123

456

J1

A26568-ND

9101112

13141516

J2

A26570-ND

D7

C320.22 uF

C140.22 uF

Heatsink

Note : 1) OCP ckt setting is remarkably accurate based on repeated test. 2) +/-75V bus and heatsink are intended for 2-ohm load -1kW testing. 3) Output is taken from 2 output connectors which make use of both Ch1 & Ch2 output

filters of a modified IRAUDAMP5 board. 4) All test results in this report are subject to change / confirmation test.

open

1kw buffered to220 irs2092 class d amp using modified iraudamp5 rev2d

Documents