MP103 Cirrus Logic, Inc., MP103 Datasheet - Page 5

• Manufacturer Part Number: MP103
• Description: Power Operational Amplifiers
• Manufacturer: Cirrus Logic, Inc.

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
MP103U
1,2,3
4,5,6
8
15
18,19,20
21,22,23
24,25,26
28
30
32
34
36
38
40,41,42
Pin #
+V
I
Out_A
Out_B
+V
-V
I
IN_B
Feedback_B
GND
+V
Feedback_A
IN_A
-V
L
L
Pin name
_A
_B
S
S
AUX
S
S
_B
_A
_A
_B
P r o d u c t I n n o v a t i o n F r o m
AUX
terminal.
Positive high voltage power supply pins for channel A.
High current output pins for channel A. A current limit resistor must be placed between these pins
and the output pin 8.
Output pin for channel A.
Output pin for channel B.
Positive high voltage power supply pins for channel B.
Negative power supply pins for channel B.
High current output pins for channel B. A current limit resistor must be placed between these pins
and the output pin 15.
Input pin for channel 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.
Ground
+24V voltage power supply pin. A 24 V power supply is required for operation of front end small
signal circuitry of each channel.
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.
Input pin for channel A.
Negative power supply pins for channel A.
S
and -V
S
must be connected physically close to the pins to prevent
Description
MP103
5