P r o d u c t I n n o v a t i o n F r o m MP230
MP230U 1
GENERAL DESCRIPTION
The MP230 operational amplier 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 fea-
tures such as four-wire current limit sensing, a shut-
down 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 impor-
tant 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 efcient operation.
The MP230 is built on a thermally conductive but elec-
trically insulating substrate that can be mounted to a
heat sink.
FEATURES
♦ 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
Power Operational Amplifier
MP230
P r o d u c t I n n o v a t i o n F r o m
EQUIVALENT CIRCUIT DIAGRAM
Copyright © Cirrus Logic, Inc. 2008
(All Rights Reserved)
http://www.cirrus.com
NOV 2008
APEX − MP230UREVG
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MP230
2 MP230U
Parameter Symbol Min Max Units
SUPPLY VOLTAGE, +VS to -VS100 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 -VBV
TEMPERATURE, pin solder, 10s 225 °C
TEMPERATURE, junction (Note 2) 175 °C
TEMPERATURE RANGE, storage −40 105 °C
OPERATING TEMPERATURE, case −40 85 °C
CHARACTERISTICS AND SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Parameter Test Conditions Min Typ Max Units
INPUT
OFFSET VOLTAGE 1 5 mV
OFFSET VOLTAGE vs. temperature Full temperature range 20 50 µV/°C
OFFSET VOLTAGE vs. supply 20 µV/V
BIAS CURRENT, initial (Note 3) 100 pA
BIAS CURRENT vs. supply 0.1 pA/V
OFFSET CURRENT, initial 50 pA
INPUT IMPEDANCE, DC 100 GΩ
INPUT CAPACITANCE 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 RS5 µV RMS
SHUTDOWN, active HSD - LSD 4.5 5 5.5 V
SHUTDOWN, inactive HSD - LSD -0.5 00.25 V
GAIN
OPEN LOOP @ 15Hz RL = 1KΩ, CC = 100pF 96 dB
GAIN BANDWIDTH PRODUCT @ 1MHz CC = 100pF 2MHz
PHASE MARGIN Full temperature range 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 A
SLEW RATE, A V = -10 CC = 100pF 12 15 V/µS
SPECIFICATIONS
P r o d u c t I n n o v a t i o n F r o m MP230
MP230U 3
NOTES:
1. Unless otherwise noted: TC = 25°C, compensation CC = 470pF, DC input specications are ± value
given, power supply voltage is typical rating. Amplier 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.
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
TEMPERATURE RANGE, case -40 85 °C
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MP230
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P r o d u c t I n n o v a t i o n F r o m MP230
MP230U 5
TYPICAL APPLICATION
MOTOR POSITION CONTROL
The MOSFET output stage of the MP230 pro-
vides superior SOA performance compared to
bipolar output stages where secondary break-
down 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 gure 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.
GENERAL
Please read Application Note 1 “General Op-
erating Considerations” which covers stability,
power supplies, heat sinking, mounting, current limit, SOA interpretation, and specication interpretation. Visit
www.cirrus.com for design tools that help automate tasks such as calculations for stability, internal power dissipa-
tion, 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 yback by the parasitic diodes of the output stage
MOSFET structure. However, for protection against sustained high energy yback 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.
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MP230
6 MP230U
OVERVOLTAGE PROTECTION
Although the MP230 can withstand differential input volt-
ages 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 suf-
cient. In more demanding applications where bias current
is important diode connected JFETs such as 2N4416 will
be required. See Q1 and Q2 in Figure 1. In either case the
differential input voltage will be clamped to ±0.7V. This
is sufcient overdrive to produce the maximum power
bandwidth. Some applications will also need over-voltage
protection devices connected to the power supply rails.
Unidirectional zener diode transient suppressors are rec-
ommended. The zeners clamp transients to voltages with-
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
polarity reversals as well as line regulation. See Z1 and
Z2 in Figure 1.
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 applica-
tions 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
The two current limit sense lines are to be connected di-
rectly across the current limit sense resistor. For the cur-
rent limit to work correctly pin 36 must be connected to
the amplier output side and pin 35 connected to the load
side of the current limit resistor RLIM as shown in Figure
2. This connection will bypass any parasitic resistances
RP, formed by socket and solder joints as well as internal
ampli 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
BOOST OPERATION
With the boost feature the small signal stages of the amplier are operated at a higher supply voltages than the
amplier’s high current output stage. +VB (pin 1) and -VB (pin 38) are connected to the small signal stages. An addi-
tional 10V on the +VB and -VB pin is sufcient to allow the small signal stages to drive the output stage into the triode
region and improve the output voltage swing for extra efcient 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.
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P r o d u c t I n n o v a t i o n F r o m MP230
MP230U 7
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 oat 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 nd the one nearest to you, go to www.cirrus.com
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