MP230
MP230
P r o d u c t IInnnnoovvaa t i o n FFr roomm
Power Operational Amplifier
Features
General Description
The MP230 operational amplifier is a surface mount
constructed component that provides a cost effective
solution in many industrial applications. The MP230
offers outstanding performance that rivals many much
more expensive hybrid components yet has a footprint
of only 4.7 sq in. The MP230 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 MP230 is built on a thermally conductive but electrically insulating substrate that can be mounted to a
heat sink.
♦ LOW COST
♦ HIGH VOLTAGE - 100 VOLTS
♦ HIGH OUTPUT CURRENT - 30 AMPS
♦ 210 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 − MP230UREVG
MP230
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
100
V
SUPPLY VOLTAGE, +Vb (boost)
(Note 6)
+VS + 15
V
SUPPLY VOLTAGE, -Vb (boost)
(Note 6)
-VS – 15V
V
OUTPUT CURRENT, peak, within SOA
40
A
POWER DISSIPATION, internal, DC
210
W
INPUT VOLTAGE
+VB to -VB
V
225
°C
175
°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
1
5
mV
20
50
µV/°C
20
µV/V
100
pA
BIAS CURRENT vs. supply
0.1
pA/V
OFFSET CURRENT, initial
50
pA
INPUT
OFFSET VOLTAGE
Full temperature range
OFFSET VOLTAGE vs. temperature
OFFSET VOLTAGE vs. supply
BIAS CURRENT, initial
(Note 3)
INPUT IMPEDANCE, DC
100
INPUT CAPACITANCE
GΩ
4
pF
COMMON MODE VOLTAGE RANGE
+VS - 13
V
COMMON MODE VOLTAGE RANGE
-VS + 13
V
COMMON MODE REJECTION, DC
92
dB
NOISE
100kHz bandwidth, 1kΩ RS
5
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
2
MHz
60
°
OUTPUT
VOLTAGE SWING
IO = 30mA
+VS - 10
+VS - 7
V
VOLTAGE SWING
IO = -30mA
-VS + 10
-VS + 8
V
VOLTAGE SWING
IO = 30A, +Vb = +VS +10V
+VS - 1.5
V
VOLTAGE SWING
IO = -30A, -Vb = -VS -10V
-VS + 3.0
V
CURRENT, continuous, DC
30
SLEW RATE, A V = -10
CC = 100pF
A
12
15
V/µS
MP230U
MP230
P r o d u c t I n n o v a t i o nF r o m
Parameter
Test Conditions
Min
Typ
Max
Units
SETTLING TIME, to 0.1%
A V = -1, 10V Step, CC = 470pF
2.5
µS
RESISTANCE, open loop
DC, 10A Load
0.1
Ω
POWER SUPPLY
VOLTAGE
±15
±45
±50
V
CURRENT, quiescent, total
27
35
mA
CURRENT, boost supply
17
mA
CURRENT, shutdown or class C quiescent
17
mA
THERMAL
RESISTANCE, AC, junction to case (Note 5) Full temp range, f ≥ 60Hz
0.6
°C/W
RESISTANCE, DC, junction to case
Full temp range, f < 60Hz
0.7
°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 = 470pF, 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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MP230U
MP230
P r o d u c t I n n o v a t i o nF r o m
TYPICAL APPLICATION
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MOTOR POSITION CONTROL
The MOSFET output stage of the MP230 provides superior SOA performance compared to
bipolar output stages where secondary breakdown is a concern. The extended SOA is ideal
in motor drive applications where the back
EMF of the motor may impose simultaneously
both high voltage and high current across the
output stage transistors. In the figure above
a mechanical to electrical feedback position
converter allows the MP230 to drive the motor
in either direction to a set point determined by
the DAC voltage.
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Please read Application Note 1 “General Op'&&%#"$,
erating 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 MP230 has two ground pins (pins 2, 40). These pins provide a return for the internal capacitive bypassing of
the small signal stages of the MP230. 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 MP230 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 MP230 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 = 470pF 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
select CC. A 100V 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.
MP230U
MP230
P r o d u c t I n n o v a t i o nF r o m
OVERVOLTAGE PROTECTION
7T ;
Although the MP230 can withstand differential input voltages up to ±25V, in some applications additional external
protection may be needed. 1N4148 signal diodes con
nected anti-parallel across the input pins is usually suffi 7T
cient. In more demanding applications where bias current
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is important diode connected JFETs such as 2N4416 will
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be required. See Q1 and Q2 in Figure 1. In either case the
differential input voltage will be clamped to ±0.7V. This
is sufficient overdrive to produce the maximum power 2
2
bandwidth. Some applications will also need over-voltage
protection devices connected to the power supply rails.
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in 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 overshoot and power-off
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polarity reversals as well as line regulation. See Z1 and
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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 MP230. 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
3
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the amplifier output side and pin 35 connected to the load
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side of the current limit resistor RLIM as shown in Figure
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2. This connection will bypass any parasitic resistances
31
RP, formed by socket and solder joints as well as internal
amplifi er 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 = .65/ILIMIT
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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.
MP230U
MP230
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 tucson.support@cirrus.com.
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
IMPORTANT NOTICE
Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject
to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant
information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale
supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus
for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third
parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights,
copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives consent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent
does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE
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Cirrus Logic, Cirrus, and the Cirrus Logic logo designs, Apex Precision Power, Apex and the Apex Precision Power logo designs are trademarks of Cirrus Logic, Inc.
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MP230U
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