CIRRUS MP230

MP230
MP230
P r o dMP230
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
HSD
8
LSD
7
+Vb
1
+Vs
R1
C1
GND
R2
Q1A
2
Q1B
R3
C2
Q17
Cc2
R13
3.9k
Q6
Q20
R7
Q11A
R15
Q10
Q11B
R8
R10
R9
R16
35 -ILIM
Q21
Q19
OUT
24-26
OUT
R11
5
R12
30-32
Q13
Q13A
R12A
Q14
GND 40
C3
R13
Q15
R14
21-23
-Vs
27-29
-Vs
-Vb 38
http://www.cirrus.com
OUT
36 +ILIM
Q18
D2
15-17
OUT
9-11
D3
R6
MP230U
Q3A
R4
Q5
Iq
Q3
R5A
Cc1 6
+IN 41
R5
Q4
4
-IN 42
+Vs
18-20
Q16
Q2
D1
12-14
LEVEL
SHIFT
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
SEP 2009
1
APEX − MP230UREVH
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
OFFSET VOLTAGE vs. temperature
Full temperature range
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
60
MHz
°
OUTPUT
VOLTAGE SWING
IO = 30A
+VS - 10
+VS - 7
V
VOLTAGE SWING
IO = -30A
-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
SLEW RATE, A V = -10
2
30
CC = 100pF
12
A
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
C1
+
C2
Cc
1
2
3
+Vb GND NC
-IN
42
+IN GND NC
41
40
39
-Vb
38
4
5
Rs1
6
7
8
9
10
12
13
14
15
16
17
18
19
20
Iq Cc1 LSD HSD OUT OUT OUT +Vs +Vs +Vs OUT OUT OUT +Vs +Vs +Vs
VIEW FROM COMPONENT SIDE
NC +ILIM -ILIM NC NC OUT OUT OUT -Vs -Vs -Vs OUT OUT OUT -Vs -Vs -Vs
34
32
30
27
25
23
33
29
26
22
21
35
31
28
24
37 36
Cc2
RLIM
LOAD &
FEEDBACK
Rs4
Rs3
C3
+
C4
NOTES:
CC IS NPO (COG) RATED FOR FULL SUPPLY VOLTAGE +VS TO -VS.
BOTH PINS 2 AND 40 REQUIRED CONNECTED TO SIGNAL GROUND.
C2 AND C3 ELECTROLYTIC ≤10µF PER AMP OUTPUT CURRENT.
C1 AND C4 HIGH QUALITY CERAMIC ≤0.1µF.
SEE TEXT FOR SELECTION OF VALUES FOR Rs1 - Rs4.
MP230U
11
Rs2
PHASE COMPENSATION
CC
GAIN W/O BOOST GAIN W/BOOST TYP. SLEW RATE
≤1
≤8
8V/µS
470pF
≤4
≤15
12V/µS
220pF
100pF
≤10
≤30
42-Pin DIP
Package Style FC
15V/µS
3
POWER DERATING
150
100
CC = 220pF
CC = 100pF
150
120
CC = 220pF
150
RL = 2.5½
180
100K
1M
FREQUENCY, F(Hz)
AV = 10
CC = 100pF
+/-VS = 50V
RL = 4Ω
PO = 1W
PO = 10W
0.01
PO = 200W
0.001
30
10K 30K
1K
100
FREQUENCY, F (Hz)
VOLTAGE DROP FROM SUPPLY, (V)
0.1
HARMONIC DISTORTION
TC
=
97
TC
=
OUTPUT VOLTAGE, VO(VP-P)
°C
85
96
20
40
60
80
100
TOTAL SUPPLY VOLTAGE, VS (V)
ROM
W/O
6
TF
OOS
-V S
B
ST FROM
W/O BOO
+V S
4
2
OST
BO
WITH
0
M -V S
FRO
M +V S
OST FRO
WITH BO
5
10 15
20 25
30
OUTPUT CURRENT, IO (A)
100K
FREQUENCY, F(Hz)
500K
QUIESCENT CURRENT vs TEMPERATURE
116
112
108
104
100
OUTPUT VOLTAGE SWING
8
0
NORMALIZED QUIESCENT CURRENT, IQ (%)
TC
pF
70
-50 -25
0
25
50
75 100
CASE TEMPERATURE. TC (°C)
98
5°C
°C
-40
=2
00
80
100
=1
90
QUIESCENT CURRENT VS SUPPLY
101
99
pF
100
10
10K
1M 2M
pF
110
1K 10K 100K
100
FREQUENCY, F(Hz)
70
120
1
0
10
1M 2M
CURRENT LIMIT
20
1 - CC = 100pF
2 - CC = 220pF
3 - CC = 470pF
RL = 2.5Ω
20
130
1K 10K 100K
100
FREQUENCY, F(Hz)
40
=4
20
1 - CC = 100pF
2 - CC = 220pF
3 - CC = 470pF
RL = 2.5Ω
60
=2
40
3
POWER RESPONSE
CC
3
60
2
80
OUTPUT CURRENT FROM +VS OR -VS, (A)
2
1
100
2M
CC
80
100
120
OPEN LOOP GAIN, A (dB)
1
2M
SMALL SIGNAL RESPONSE W/O BOOST
NORMALIZED QUIESCENT CURRENT, IQ (%)
100
RL = 2.5½
180
100K
1M
FREQUENCY, F(Hz)
CC
OPEN LOOP GAIN, A (dB)
120
CC = 100pF
0
-40 -20 0
20 40 60 80 100
CASE TEMPERATURE. TC (°C)
0
10
NORMALIZED CURRENT LIMIT, (%)
CC = 470pF
50
120
DISTORTION, THD (%)
90
CC = 470pF
200
SMALL SIGNAL RESPONSE W/ BOOST
4
PHASE RESPONSE W/O BOOST
PHASE RESPONSE W/BOOST
90
PHASE Ф, (°)
250
P r o d u c t I n n o v a t i o nF r o m
PHASE Ф, (°)
INTERNAL POWER DISSIPATION, P(W)
MP230
96
-40 -20 0
20 40 60 80 100
CASE TEMPERATURE, (°C)
40
SAFE OPERATING AREA
10 10mS, T = 25°C
C
5
100mS, TC = 25°C
200mS, TC = 25°C
DC, TC = 25°C
DC, TC = 85°C
1
1
10
100
SUPPLY TO OUTPUT DIFFERENTIAL, VS - VO (V)
MP230U
MP230
P r o d u c t I n n o v a t i o nF r o m
TYPICAL APPLICATION
+Vs
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.
12-14
18-20
+Vs
42
DAC OUTPUT
POSITION
COMMAND
GENERAL
1
+Vb
2
Rs1
Rs2
Rs3
Rs4
35
-ILIM
*
36
OUT
Cc1
+ILIM
RLIM
Cc2
41
GND 4 6
MOTOR
*OUT
-Vb
DRIVE
40
9-11
-Vs
38
15-17
Cc
24-26
21-23
30-32
27-29
GND
-Vs
POSITION
FEEDBACK
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.
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.
OVERVOLTAGE PROTECTION
Although the MP230 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 demanding applications where bias current is important diode connected JFETs such as 2N4416 will be
MP230U
5
MP230
P r o d u c t I n n o v a t i o nF r o m
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 bandwidth. Some applications will
also need over-voltage protection devices connected to the power
supply rails. Unidirectional zener diode transient suppressors are
recommended. The zeners clamp transients to voltages within -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 Q1
power-on overshoot and power-off polarity reversals as well as
line regulation. See Z1 and Z2 in Figure 1.
POWER SUPPLY BYPASSING
+IN
+Vs
+Vs
42
Z1
1
+Vb
2
GND
OUT
Q2
41
GND
-Vb
40
-Vs
Bypass capacitors to power supply terminals +VS and -VS must
38
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
Z2
electrolytic capacitors with high quality ceramic capacitors 0.1µF
-Vs
or greater. In most applications power supply terminals +VB and
FIGURE 1: OVERVOLTAGE PROTECTION
-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
R
F
The two current limit sense lines are to be connected directly
across the current limit sense resistor. For the current limit to work
35
correctly pin 36 must be connected to the amplifier output side and IN RIN 42
36
pin 35 connected to the load side of the current limit resistor RLIM
-ILIM
+I
OUT
LIM
as shown in Figure 2. This connection will bypass any parasitic reRP
sistances RP, formed by socket and solder joints as well as internal
41
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:
FIGURE 2: 4 WIRE CURRENT LIMIT
RLIM = .65/ILIMIT
RLIM
RL
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.
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.
6
MP230U
P r o d u c t I n n o v a t i o nF r o m
MP230
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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MP230U
7