CIRRUS MP240

MP240
MP240
P r o d u c t IInnnnoovvaa t i o n FFr roomm
Power Operational Amplifier
Features
General Description
The MP240 operational amplifier is a surface mount
constructed component that provides a cost effective
solution in many industrial applications. The MP240
offers outstanding performance that rivals much more
expensive hybrid components yet has a footprint of
only 4.7 sq in. The MP240 has many optional features such as four-wire current limit sensing, a shutdown control and external compensation. In addition,
the class A/B output stage biasing can be turned off
for lower quiescent current with class C operation in
applications where crossover distortion is less important such as when driving motors, for example. A boost
voltage feature biases the output stage for close linear
swings to the supply rail for extra efficient operation.
The MP240 is built on a thermally conductive but electrically insulating substrate that can be mounted to a
heat sink.
♦ LOW COST
♦ HIGH VOLTAGE - 200 VOLTS
♦ HIGH OUTPUT CURRENT - 20 AMPS
♦ 170 WATT DISSIPATION CAPABILITY
APPLICATIONS
♦ MOTOR DRIVE
♦ MAGNETIC DEFLECTION
♦ PROGRAMMABLE POWER SUPPLIES
♦ INDUSTRIAL AUDIO AMPLIFIER
Equivalent Circuit Diagram
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Copyright
© Cirrus Logic, Inc. 2008
(All Rights Reserved)
NOV 2008
APEX − MP240UREVG
MP240
P r o d u c t I n n o v a t i o nF r o m
Characteristics and Specifications
Absolute Maximum Ratings
Parameter
Symbol
Min
Max
Units
SUPPLY VOLTAGE, +VS to -VS
200
V
OUTPUT CURRENT, +Vb
(Note 6)
+VS + 15V
V
POWER DISSIPATION, -Vb
(Note 6)
-VS - 15V
V
OUTPUT CURRENT, peak, within SOA
25
A
POWER DISSIPATION, internal, DC
170
W
INPUT VOLTAGE
+VB to -VB
V
225
°C
150
°C
TEMPERATURE, pin solder, 10s
TEMPERATURE, junction
(Note 2)
TEMPERATURE RANGE, storage
−40
105
°C
OPERATING TEMPERATURE, case
−40
85
°C
Specifications
Parameter
Test Conditions
Min
Typ
Max
Units
INPUT
OFFSET VOLTAGE
Full temperature range
OFFSET VOLTAGE vs. temperature
1
5
mV
20
50
µV/°C
20
µV/V
OFFSET VOLTAGE vs. supply
BIAS CURRENT, initial
100
pA
BIAS CURRENT vs. supply
(Note 3)
0.1
pA/V
OFFSET CURRENT, initial
50
pA
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
100
GΩ
4
pF
COMMON MODE VOLTAGE RANGE
+VB - 15
V
COMMON MODE VOLTAGE RANGE
-VB + 15
V
COMMON MODE REJECTION, DC
92
dB
DIFFERENTIAL INPUT VOLTAGE
±25
5
V
NOISE
1MHz bandwidth, 1kΩ RS
µV RMS
SHUTDOWN, active
HSD - LSD
4.5
5
5.5
V
SHUTDOWN, inactive
HSD - LSD
-0.5
0
0.25
V
GAIN
OPEN LOOP @ 15Hz
RL= 1KΩ, CC = 100pF
GAIN BANDWIDTH PRODUCT @ 1MHz
CC = 100pF
PHASE MARGIN
Full temperature range
96
dB
1.8
MHz
60
°
OUTPUT
VOLTAGE SWING
IO = 20mA
+VS - 10
+VS - 7
V
VOLTAGE SWING
IO = -20mA
-VS + 10
-VS + 8
V
VOLTAGE SWING
IO = 20A, +Vb = +VS +10V
+VS - 3.0
+VS - 2.0
V
VOLTAGE SWING
IO = -20A, -Vb = -VS -10V
-VS + 6.0
-VS + 5.0
V
CURRENT, continuous, DC
20
SLEW RATE, A V = -10
CC = 100pF
A
12
14
V/µS
MP240U
MP240
P r o d u c t I n n o v a t i o nF r o m
Parameter
Test Conditions
Min
SETTLING TIME, to 0.1%
A V = -1, 10V Step, CC = 680pF
RESISTANCE, open loop
DC, 10A Load
Typ
Max
Units
5
µS
0.2
Ω
POWER SUPPLY
VOLTAGE
±15
CURRENT, quiescent, total
±75
±100
V
16.5
25
mA
CURRENT, shutdown or class C quiescent
8.5
mA
CURRENT, boost supply
8.5
mA
THERMAL
RESISTANCE, AC, junction to case (Note 5) Full temp range, f ≥ 60Hz
0.58
°C/W
RESISTANCE, DC, junction to case
Full temp range, f < 60Hz
0.73
°C/W
RESISTANCE, junction to air
Full temp range
14
°C/W
85
°C
TEMPERATURE RANGE, case
-40
NOTES:
1. Unless otherwise noted: TC = 25°C, compensation CC = 680pF, DC input specifications are ± value
given, power supply voltage is typical rating. Amplifier operated without boost feature.
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate
internal power dissipation to achieve high MTBF.
3. Doubles for every 10°C of case temperature increase.
4. +Vs and -Vs denote the + and - output stage supply voltages. +Vb and -Vb denote the + and - input
stage supply voltages (boost voltages).
5. Rating applies if the output current alternates between both output transistors at a rate faster than
60Hz.
6. Power supply voltages +Vb and -Vb must not be less than +VS and -VS respectively.
External Connections
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MP240U
MP240
P r o d u c t I n n o v a t i o nF r o m
Typical Application
MOTOR POSITION CONTROL
7T
The MOSFET output stage of the MP240 pro
vides superior SOA performance compared
to bipolar output stages where secondary
3T
breakdown is a concern. The extended SOA
7T
3T
7C
is ideal in motor drive applications where the
3T
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ure above a mechanical to electrical feedback
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position converter allows the MP240 to drive
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the motor in either direction to a set point de
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termined by the DAC voltage.
The MP400 is ideally suited to driving both
piezo actuation and deflection applications
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off of a single low voltage supply. The circuit
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above boosts a system 24V buss to 350V to
drive an ink jet print head. The MP400s high speed deflection amplifier is biased for single supply operation by
external resistors R2 – R6, so that a 0 to 5V DAC can be used as the input to the amplifier to drive the print head
from 0 to >300V.
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, Cirrus’s complete Application Notes library, Technical Seminar Workbook and Evaluation Kits.
GROUND PINS
The MP240 has two ground pins (pins 2, 40). These pins provide a return for the internal capacitive bypassing of
the small signal stages of the MP240. The two ground pins are not connected together on the substrate. Both of
these pins are required to be connected to the system signal ground.
BALANCING RESISTOR SELECTION (RS1-RS4)
The MP240 uses parallel sets of output transistors. To ensure that the load current is evenly shared among the
transistors external balancing resistors RS1-RS4 are required. To calculate the required value for each of the resistors
use: R = 4.5/I2 ,where I is the maximum expected output current. For example, with a maximum output current of
10A each balancing resistor should be 0.045 ohms. Each resistor dissipates 1.125W at the maximum current. Use
a non-inductive 2W rated resistor. A ready source for such resistors is the IRC resistor series LR available from
Mouser Electronics.
SAFE OPERATING AREA
The MOSFET output stage of the MP240 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
on previous page). The output stage is protected against transient flyback by the parasitic diodes of the output stage
MOSFET structure. However, for protection against sustained high energy flyback external fast-recovery diodes
must be used.
COMPENSATION
The external compensation capacitor CC is connected to pins 4 and 6. Unity gain stability can be achieved with
CC = 680pF for a minimum phase margin of 60 degrees. At higher gains more phase shift can usually be tolerated
and CC can be reduced resulting in higher bandwidth and slew rate. Use the typical operating curves as a guide to
MP240U
MP240
P r o d u c t I n n o v a t i o nF r o m
select CC. A 200V NPO (COG) type capacitor is required. Boost operation requires more compensation or higher
gains than with normal operation due to the increased capacitance of the output transistors when the output signal
swings close to the supply rails.
OVERVOLTAGE PROTECTION 7T
;
Although the MP240 can withstand differential input voltages
up to ±25V, in some applications additional external protection may be needed. 1N4148 signal diodes connected anti
parallel across the input pins is usually sufficient. In more
7T
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diode connected JFETs such as 2N4416 will be required.
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input voltage will be clamped to ±0.7V. This is sufficient 2
2
overdrive to produce the maximum power bandwidth. Some
applications will also need over-voltage protection devices
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connected to the power supply rails. Unidirectional zener di*/
7C
ode transient suppressors are recommended. The zeners
7T
clamp transients to voltages within the power supply rating
and also clamp power supply reversals to ground. Whether
the zeners are used or not the system power supply should
be evaluated for transient performance including power-on
;
7T
overshoot and power-off polarity reversals as well as line
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regulation. See Z1 and Z2 in Figure 1.
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POWER SUPPLY BYPASSING
Bypass capacitors to power supply terminals +VS and -VS must be connected physically close to the pins to prevent
local parasitic oscillation in the output stage of the MP240. Use electrolytic capacitors at least 10µF per output amp
required. Bypass the electrolytic capacitors with high quality ceramic capacitors 0.1µF or greater. In most applications power supply terminals +Vb and -Vb will be connected to +VS and -VS respectively. Although +Vb and -Vb are
bypassed internally it is recommended to bypass +Vb and -Vb with 0.1µF externally. Additionally ground pins 2 and
40 must be connected to the system signal ground.
CURRENT LIMIT
3'
The two current limit sense lines are to be connected directly
across the current limit sense resistor. For the current limit
to work correctly pin 36 must be connected to the amplifier
3
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rent limit resistor RLIM as shown in Figure 2. This connection
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will bypass any parasitic resistances RP, formed by socket
31
and solder joints as well as internal amplifier losses. The
current limiting resistor may not be placed anywhere in the
output circuit except where shown in Figure 2. The value of
the current limit resistor can be calculated as follows: RLIM
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3-
BOOST OPERATION
With the boost feature the small signal stages of the amplifier are operated at a higher supply voltages than the
amplifier’s high current output stage. +Vb (pin 1) and -Vb (pin 38) are connected to the small signal stages. An additional 10V on the +Vb and -Vb pin is sufficient to allow the small signal stages to drive the output stage into the triode
region and improve the output voltage swing for extra efficient operation when required. When the boost feature
is not needed +VS and -VS are connected to +Vb and -Vb respectively. +Vb and -Vb must not be operated at supply
voltages less than +VS and -VS respectively.
MP240U
MP240
P r o d u c t I n n o v a t i o nF r o m
SHUTDOWN
The output stage is turned off by applying a 5V level to HSD (pin 8) relative to LSD (pin 7). This is a non-latching
circuit. As long as HSD remains high relative to LSD the output stage will be turned off. LSD will normally be tied to
signal ground but LSD may float from -Vb to +Vb - 15V. Shutdown can be used to lower quiescent current for standby
operation or as part of a load protection circuit.
BIAS CLASS OPTION
Normally pin 5 (Iq) is left open. But when pin 5 is connected to pin 6 (Cc1) the quiescent current in the output stage
is disabled. This results in lower quiescent power, but also class C operation of the output stage and the resulting
crossover distortion. In many applications, such as driving motors, the distortion may be unimportant and lower
standby power dissipation is an advantage.
Contacting Cirrus Logic Support
For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact [email protected]
International customers can also request support by contacting their local Cirrus Logic Sales Representative.
To find the one nearest to you, go to www.cirrus.com
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MP240U