P r o d u c t I n n o v a t i o n F r o m

MP103

MP103U

5

Pin #

Pin name

Description

1,2,3

+V

Positive high voltage power supply pins for channel A.

4,5,6

I

High current output pins for channel A. A current limit resistor must be placed between these pins

and the output pin 8.

8

Out_A

Output pin for channel A.

15

Out_B

Output pin for channel B.

18,19,20

+V

Positive high voltage power supply pins for channel B.

21,22,23

-V

Negative power supply pins for channel B.

24,25,26

I

High current output pins for channel B. A current limit resistor must be placed between these pins

and the output pin 15.

28

IN_B

Input pin for channel B.

30

Feedback_B

Feed back pin for channel B. This pin must be connected to output B pin 15 to close the feedback

loop. When connected directly to pin 15 the closed loop voltage gain of channel B is 65 V/V. The

gain can be increased by inserting a 1/4 W resistor between pins 30 and 15.

32

GND

Ground

34

+V

AUX

+24V voltage power supply pin. A 24 V power supply is required for operation of front end small

signal circuitry of each channel.

36

Feedback_A

Feed back pin for channel A. This pin must be connected to output A pin 8 to close the feedback

loop. When connected directly to pin 8 the closed loop voltage gain of channel A is 65 V/V. The

gain can be increased by inserting a 1/4 W resistor between pins 36 and 8.

38

IN_A

Input pin for channel A.

40,41,42

-V

Negative power supply pins for channel A.

PIN DESCRIPTIONS

GENERAL

Please read Application Note 1 “General Operating Considerations” which covers stability, power supplies, heat

sinking, mounting, current limit, SOA interpretation, and specification interpretation. Visit www.Cirrus.com for design

tools that help automate tasks such as calculations for stability, internal power dissipation, current limit, heat sink

selection, Apex Precision Power’s complete Application Notes library, Technical Seminar Workbook and Evaluation

Kits.

AMPLIFIER GAIN

When the feedback pin for each channel is connected to the corresponding OUT pin, the gain of the amplifier is

internally set to 65 V/V. The amplifier gain can be increased by connecting a resistor between the feedback and Out

pin. The amplifier gain will be increased approximately 1 V/V for each additional 49.9Ω added between the feedback

and OUT pin.

SAFE OPERATING AREA

The MOSFET output stage of the MP103 is not limited by second breakdown considerations as in bipolar output

stages. Only thermal considerations and current handling capabilities limit the SOA (see Safe Operating Area

graph). The output stage is protected against transient flyback by the parasitic body diodes of the output stage

MOSFET structure. However, for protection against sustained high energy flyback external fast-recovery diodes

must be used.

POWER SUPPLY BYPASSING

Bypass capacitors to power supply terminals +V

local parasitic oscillation in the output stage of the MP103. Use electrolytic capacitors at least 10μF per output amp

required. Bypass the electrolytic capacitors with high quality ceramic capacitors (X7R) 0.1μF or greater. Duplicate

the supply bypass for the supply terminals of each amplifier channel. A bypass capacitor of 0.1μF or greater is rec-

ommended for the +V