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MICROTECHNOLOGY

POWER OPERATIONAL AMPLIFIER

MP108FD

FEATURES

• LOW COST

• HIGH VOLTAGE - 200 VOLTS

• HIGH OUTPUT CURRENT - 10 AMPS

• 100 WATT DISSIPATION CAPABILITY

• 300kHz POWER BANDWIDTH

APPLICATIONS

• INKJET PRINTER HEAD DRIVE

• PIEZO TRANSDUCER DRIVE

• INDUSTRIAL INSTRUMENTATION

• REFLECTOMETERS

• ULTRA-SOUND TRANSDUCER DRIVE

DESCRIPTION

The MP108FD operational amplifier is a surface mount

constructed component that provides a cost effective

solution in many industrial applications. The MP108FD offers

outstanding performance that rivals much more expensive

hybrid components yet has a footprint of only 4 sq in. The

MP108FD has many optional features such as four-wire

current limit sensing and external compensation. The 300 kHz

power bandwidth and 10 amp output of the MP108FD makes

it a good choice for piezo transducer drive applications. The

MP108FD is built on a thermally conductive but electrically

insulating substrate that can be mounted to a heat sink.

EQUIVALENT CIRCUIT DIAGRAM

34-pin DIP

PACKAGE STYLE FD

TYPICAL APPLICATION

INKJET

NOZZLE

DRIVE

The MP108FD's fast slew rate and wide power bandwith

make it an ideal nozzle driver for industrial inkjet printers.

The 10 amp output capability can drive hundreds of nozzles

simultaneously.

EXTERNAL CONNECTIONS

R1

R12

R9

R10

Q1A

Q1B

Q15A

Q15B

R2

R11

R8

Q14

Q24

R20

+Vs

-IN

+IN

-Vs

+Vb

R7

Q2

R3

R19

Q23

-Vb

Q3

Q22

R17

R5

Q12 Q13

Q4

Cc2

Cc1

C1

C3

GND

GND

R15

Q17

IC1

+Ilim

-Ilim

D2

Q11

Q16

OUT

-Vb

+Vb

C5

SUBSTRATE

BACKPLATE

+Vs

+Vs

-Vs

-Vs

OUT

OUT

OUT

OUT

OUT

BACK

PLATE

TP

D1

Q8

Q7

Q9

Q6

Q20

Q19

Q21

Q18

8

4

3

2

1

34

5

6

25

33

32

30

11

14

15

16

27

12

13

28

20

21

22

17

18

19

OUT

GND

GND

PIEZO

TRANSDUCER

PRINT

NOZZLE

COMMAND

VOLTAGE

-IN

+IN

GND

GND

1

2

3

4

5

6

78

31

32

29

30

28

27

26

25

33

34

NOTES:

BOTH PINS 3 AND 32 REQUIRED CONNECTED TO SIGNAL GROUND

C2 AND C3 ELECTROLYTIC ≥ 10µF PER AMP OUTPUT CURRENT

C1,C4,C5-8 HIGH QUALITY CERAMIC ≥ 0.1µF

ALL OUTPUT PINS MUST BE TIED TOGETHER

VIEW FROM COMPONENT SIDE

PHASE COMPENSATION

GAIN W/O BOOST

≥ 1

≥ 4

≥ 10

C

C

100pF

33pF

10pF

+

C1

C2

C4

+

C3

9

10

11

12

22

24

23

21

OUT

NC

13

14

15

16

17

18

19

20

OUT

OUT

LOAD &

FEEDBACK

NC

NC

TYP. SLEW RATE

55 V/µS

135 V/µS

170 V/µS

OUT

OUT

OUT

BACK

PLT

TP

NC

NC

NC

NC

NC

C5

C6

C7

C8

GAIN W BOOST

≥ 1

≥ 3

≥ 10

C

C

470pF

220pF

33pF

TYP. SLEW RATE

12 V/µS

35 V/µS

135 V/µS