MP108 • MP108A
MP108U 1
MP108, MP108A
Power Operational Amplifier
MP108 • MP108A
FEATURES
• LOW COST
• HIGH VOLTAGE - 200 VOLTS
• HIGH OUTPUT CURRENT - 10 AMPS
• 100 WATT DISSIPATION CAPABILITY
• 300kHz POWER BANDWIDTH
APPLICATIONS
• INKJET PRINTER HEAD DRIVE
• PIEZO TRANSDUCER DRIVE
• INDUSTRIAL INSTRUMENTATION
• REFLECTOMETERS
• ULTRA-SOUND TRANSDUCER DRIVE
R1
R12
R9
R10
Q1A Q1B
Q15A Q15B
R2
R11
R8
Q14
Q24
R20
+Vs
-IN
+IN
-Vs
+Vb
R7
Q2
R3
R19
Q23
-Vb
Q3
Q22
R17
R5
Q12 Q13
Q4
Cc2
Cc1
C1
C3
GND
GND
R15
Q17
IC1
+Ilim
-Ilim
D2
Q11
Q16
OUT
-Vb
+Vb
C5
SUBSTRATE
BACKPLATE
+Vs
+Vs
-Vs
-Vs
OUT
OUT
OUT
OUT
OUT
BACK
PLATE
TP D1
Q8
Q7
Q9
Q6
Q20
Q19
Q21
Q18
8
4
3
2
1
34
5
6
25
33
32
30
11
14
15
16
27
12
13
28
20
21
22
17
18
19
DESCRIPTION
The MP108 operational amplier is a surface mount
constructed component that provides a cost effective
solution in many industrial applications. The MP108
offers outstanding performance that rivals much more
expensive hybrid components yet has a footprint of
only 4 sq in. The MP108 has many optional features
such as four-wire current limit sensing and external
compensation. The 300 kHz power bandwidth and 10
amp output of the MP108 makes it a good choice for
piezo transducer drive applications. The MP108 is built
on a thermally conductive but electrically insulating
substrate that can be mounted to a heat sink.
EQUIVALENTCIRCUITDIAGRAM
Copyright © Apex Microtechnology, Inc. 2012
(All Rights Reserved)
www.apexanalog.com SEP2012
MP108UREVF
MP108 • MP108A
2 MP108U
ABSOLUTEMAXIMUMRATINGS
SPECIFICATIONS
Parameter Symbol Min Max Units
SUPPLY VOLTAGE, +VS to -VS200 V
SUPPLY VOLTAGE, +VB (Note 6) +VS, +15 V
SUPPLY VOLTAGE, -VB (Note 6) -VS, -15 V
OUTPUT CURRENT, peak, within SOA 12 A
POWER DISSIPATION, internal, DC 100 W
INPUT VOLTAGE +VB to -VBV
TEMPERATURE, pin solder, 10s 225 °C
TEMPERATURE, junction (Note 2) 150 °C
TEMPERATURE, storage -40 +105 °C
OPERATING TEMPERATURE RANGE, case -40 +85 °C
Parameter
TestConditions
(Note 1)
MP108 MP108A
UnitsMin Typ Max Min Typ Max
INPUT
OFFSET VOLTAGE 1 5 * 3 mV
OFFSET VOLTAGE,
vs. temperature Full temp range 50 * µV/°C
OFFSET VOLTAGE,
vs. supply 20 * µV/V
BIAS CURRENT, initial (Note 3) 100 70 pA
BIAS CURRENT,
vs. supply 0.1 * pA/V
OFFSET CURRENT, initial 50 30 pA
INPUT RESISTANCE, DC 1011 * Ω
INPUT CAPACITANCE 4 * pF
COMMON MODE
VOLTAGE RANGE
+VB - 15
* V
COMMON MODE
VOLTAGE RANGE
-VB + 15
* V
COMMON MODE
REJECTION, DC 92 * dB
NOISE 1MHz BW, RS = 1KΩ 10 *
µV RMS
GAIN
OPEN LOOP, @ 15Hz RL = 10KΩ, CC = 10pF 96 * dB
GAIN BANDWIDTH PRODUCT
@ 1MHz CC = 10pF 10 * MHz
PHASE MARGIN Full temp range 45 * °
MP108 • MP108A
MP108U 3
NOTES: * The specication of MP108A is identical to the specication for MP108 in the applicable column to
the left.
1. Unless otherwise noted: TC = 25°C, CC = 100pF. DC input specications are value given. Power sup-
ply voltage is typical rating.
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate
internal power dissipation to achieve high MTTF.
3. Doubles for every 10°C of case temperature increase.
4. +VS and -VS denote the positive and negative supply voltages to the output stage. +VB and -VB de-
note the positive and negative supply voltages to the input stages.
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
(Note 1)
MP108 MP108A
UnitsMin Typ Max Min Typ Max
OUTPUT
VOLTAGE SWING I O = 10A +VS - 10 +VS - 8.6 * * V
VOLTAGE SWING I O = -10A -VS + 10 -VS + 7 * * V
VOLTAGE SWING I O = 10A,
+VB = +VS +10V +VS - 1.6 * V
VOLTAGE SWING I O = -10A,
-VB = -VS -10V -VS + 5.1 * V
CURRENT, CONTINUOUS, DC 10 11 A
SLEW RATE, A V = -20 CC= 10pF 150 170 * * V/µS
SETTLING TIME to 0.1% 2V step 1 * µS
RESISTANCE No load, DC 5 * Ω
POWER BANDWIDTH 180VP-P
CC = 10pF,
+VS = 100V,
-VS = -100V
300 * kHz
POWERSUPPLY
VOLTAGE ±15 ±75 ±100 * * * V
CURRENT, quiescent 50 65 * * mA
THERMAL
RESISTANCE, AC,
junction to case (Note 5)
Full temp range,
F≥60Hz 1 * °C/W
RESISTANCE, DC,
junction to case
Full temp range,
F<60Hz 1.25 * °C/W
RESISTANCE,
junction to air (Note 4) Full temp range 13 * °C/W
TEMPERATURE RANGE, case -40 +85 * * °C
MP108 • MP108A
4 MP108U
-40 -20 0 20 40 60 80 100
0
20
40
60
80
100
INTERNAL POWER DISSIPATION, P(W)
POWER DERATING
CASE TEMPERATURE, TC (°C)
1 10 100
SUPPLY TO OUTPUT DIFFERENTIAL, VS-VO (V)
1
10
200
0.2
20
OUTPUT CURRENT FROM +VS OR -VS (A)
SAFE OPERATING AREA
10mS, TC=25°C
DC, TC=25°C
100mS, TC=25°C
DC, TC=85°C
-50 -25 0 25 50 75 100
70
80
90
100
110
120
130
NORMALIZED CURRENT LIMIT, (%)
CASE TEMPERATURE, TC (°C)
CURRENT LIMIT
QUIESCENT CURRENT vs. TEMPERATURE
NORMALIZED QUIESCENT CURRENT, IO (%)
CASE TEMPERATURE, (°C)
0 20 40 60-20-40
105
100
95
90
115
80 100
110
QUIESCENT CURRENT vs. SUPPLY
NORMALIZED QUIESCENT CURRENT, IO (%)
TOTAL SUPPLY VOLTAGE, VS (V)
80 120 160 200400
100
80
60
40
120
TC = 85°C
TC = -40°C
TC = 25°C
HARMONIC DISTORTION
DISTORTION, THD (%)
FREQUENCY, F (Hz)
30 30K10K1K100
AV = 20
CC = 10pF
VS = 52V
RL = 4Ω
P
O
= 200W
PO = 10W
P
O
= 100W
1
0.1
0.01
0.001
SMALL SIGNAL RESPONSE W/O BOOST
FREQUENCY, F (Hz)
OPEN LOOP GAIN, A (dB)
10 1M100K10K1K100 10M
120
100
80
60
40
20
0
CC = 10pF
CC = 33pF
CC = 100pF
RL = 4Ω
IO = 1A DC
SMALL SIGNAL RESPONSE W/ BOOST
FREQUENCY, F (Hz)
OPEN LOOP GAIN, A (dB)
10 1M100K10K1K100 10M
120
100
80
60
40
20
0
CC = 33pF
CC = 220pF
CC = 470pF
RL = 4Ω
IO = 1A
1
FREQUENCY, F (Hz)
OUTPUT VOLTAGE, VO (VP-P)
200
20
100
10K 100K 1M 5M
POWER RESPONSE
CC = 10pF
CC = 33pF CC = 100pF
CC = 220pF
CC = 470pF
2
3
2
1
1
PHASE RESPONSE W/ BOOST
FREQUENCY, F (Hz)
PHASE, Ф (°)
100K 5M1M
90
120
150
180
210
1 CC = 10pF
2 CC = 33pF
3 CC = 100pF
RL = 4Ω
IO = 1A
2
3
2
1
1
PHASE RESPONSE W/O BOOST
FREQUENCY, F (Hz)
PHASE, Ф (°)
300K 10M1M
90
120
150
180
1 CC = 10pF
2 CC = 33pF
3 CC = 100pF
RL = 4Ω
IO = 1A
OUTPUT VOLTAGE SWING
OUTPUT CURRENT, IO (A)
VOLTAGE DROP FROM SUPPLY, (V)
9
8
7
6
5
4
3
2
1
00 2 4 6 8 10
W/O BOOST FROM +V
S
W/O BOOST FROM -V
S
WITH BOOST FROM +V
S
WITH BOOST FROM -V
S
T
C
= 25°C
50mS PULSE
TYPICALPERFORMANCEGRAPHS
MP108 • MP108A
MP108U 5
TYPICALAPPLICATION
INKJETNOZZLEDRIVE
The MP108's fast slew rate and wide power bandwith
make it an ideal nozzle driver for industrial inkjet print-
ers. The 10 amp output capability can drive hundreds
of nozzles simultaneously.
CC
+VS
-VS
OUT
CC2
CC1
GND
GND
+VB
+VS
-VB
-VS
-ILIM
+ILIM
RLIM
RF
RI
PIEZO
TRANSDUCER
PRINT
NOZZLE
COMMAND
VOLTAGE
-IN +IN
+VB
-VB
CC2
GND
GND
1234567 8
31
32 29
30 28 27 26 25
3334
CC1
-ILIM
+ILIM
CC
NOTES:
CC IS NPO (COG) RATED FOR FULL SUPPLY VOLTAGE +VS TO -VS
BOTH PINS 3 AND 32 REQUIRED CONNECTED TO SIGNAL GROUND
C2 AND C3 ELECTROLYTIC 10µF PER AMP OUTPUT CURRENT
C1,C4,C5-8 HIGH QUALITY CERAMIC 0.1µF
ALL OUTPUT PINS MUST BE TIED TOGETHER
VIEW FROM COMPONENT SIDE
PHASE COMPENSATION
GAIN W/O BOOST
1
4
10
CC
100pF
33pF
10pF
+
C1
C2
C4
+C3
RLIM
910 11 12
2224 23 21
+VS
+VS
+VS
OUT
NC
13 14 15 16
17
18
19
20
OUTOUT
-VS
-VS-VS
LOAD &
FEEDBACK
-VB
NC
NC
+VB
TYP. SLEW RATE
55 V/µS
135 V/µS
170 V/µS
OUTOUTOUT
BACK
PLT
TP NC NC NC
NC NC
C5
C6
C7 C8
GAIN W BOOST
1
3
10
CC
470pF
220pF
33pF
TYP. SLEW RATE
12 V/µS
35 V/µS
135 V/µS
34-pinDIP
PACKAGESTYLEFD
EXTERNALCONNECTIONS
MP108 • MP108A
6 MP108U
GENERAL
Please read Application Note 1 "General Operating Considerations" which covers stability, power supplies, heat
sinking, mounting, current limit, SOA interpretation, and specication 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 MP108 has two ground pins (pins 3, 32). These pins provide a return for the internal capacitive bypassing of
the small signal portions of the MP108. 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.
SAFEOPERATINGAREA
The MOSFET output stage of the MP108 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 body diodes of the out-
put 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 between pins 5 and 6. Unity gain stability can be achieved
with any capacitor value larger than 100pF for a minimum phase margin of 45 degrees. At higher gains more phase
shift can usually be tolerated in most designs and the compensation capacitor value can be reduced resulting in
higher bandwidth and slew rate. Use the typical operating curves as a guide to select CC for the application. An NPO
(COG) type capacitor is required rated for the full supply voltage (200V).
OVERVOLTAGEPROTECTION
Although the MP108 can withstand differential input voltages up to ±25V, addi-
tional external protection is recommended. In most applications 1N4148 signal
diodes connected anti-parallel across the input pins is sufcient. In more de-
manding 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 usually suf-
cient 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 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 includ-
ing power-on overshoot and power-off polarity reversals as well as line regula-
tion. 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 MP108. Use electrolytic capacitors at least 10µF per output amp
required. Bypass the electrolytic capacitors with high quality ceramic capacitors (X7R) 0.1µF or greater. In most ap-
plications power supply terminals +VB and -VB will be connected to +VS and -VS respectively. Supply voltages +VB
and -VB are bypassed internally but both ground pins 3 and 32 must be connected to the system signal ground to
be effective. In all cases power to the buffer amplier stage of the MP108 at pins 8 and 25 must be connected to
+VB and -VB at pins 4 and 30 respectively. Provide local bypass capacitors at pins 8 and 25. See the external con-
nections diagram on page 1.
34
33
+Vs
-Vs
OUT
3
32
GND
GND
+Vb
+Vs
-Vb
-Vs
Z1
Z2
-IN
+IN
Q1
Q2
FIGURE1.
OVERVOLTAGEPROTECTION
MP108 • MP108A
MP108U 7
CURRENTLIMIT
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
28 must be connected to the amplier output side and pin 27 connect-
ed 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 cur-
rent 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 amplier are operated at a higher supply voltages than the am-
plierís high current output stage. +VB (pins 4,8) and -VB (pins 25,30) are connected to the small signal stages and
+VS (pins 14-16) and -VS (pins 17-19) are connected to the high current output stage. An additional 10V on the +VB
and -VB pins is sufcient to allow the small signal stages to drive the output stage into the triode region and improve
the output voltage swing for extra efcient operation when required. When the boost feature is not needed +VS and
-VS are connected to the +VB and -VB pins respectively. The +VB and -VB pins must not be operated at supply volt-
ages less than +VS and -VS respectively.
BACKPLATEGROUNDING
The substrate of the MP108 is an insulated metal substrate. It is required that it be connected to signal ground.
Connect pin 2 (back plate) to signal ground. The back plate will then be AC grounded to signal ground through a
1µF capacitor.
34
OUT
11-13
20-22
33
ILIM-
ILIM+
27
28 RP
RL
IN
RF
RLIM
RIN
FIGURE2.4WIRECURRENTLIMIT
NEEDTECHNICALHELP?CONTACTAPEXSUPPORT!
For all Apex Microtechnology product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact apex.support@apexanalog.com.
International customers can also request support by contacting their local Apex Microtechnology Sales Representative.
To nd the one nearest to you, go to www.apexanalog.com
IMPORTANT NOTICE
Apex Microtechnology, Inc. has made every effort to insure the accuracy of the content contained in this document. However, the information is subject to change
without notice and is provided "AS IS" without warranty of any kind (expressed or implied). Apex Microtechnology reserves the right to make changes without further
notice to any specications or products mentioned herein to improve reliability. This document is the property of Apex Microtechnology and by furnishing this informa-
tion, Apex Microtechnology grants no license, expressed or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual
property rights. Apex Microtechnology owns the copyrights associated with the information contained herein and gives consent for copies to be made of the informa-
tion only for use within your organization with respect to Apex Microtechnology integrated circuits or other products of Apex Microtechnology. 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.
APEX MICROTECHNOLOGY PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN PRODUCTS USED FOR
LIFE SUPPORT, AUTOMOTIVE SAFETY, SECURITY DEVICES, OR OTHER CRITICAL APPLICATIONS. PRODUCTS IN SUCH APPLICATIONS ARE UNDER-
STOOD TO BE FULLY AT THE CUSTOMER OR THE CUSTOMER’S RISK.
Apex Microtechnology, Apex and Apex Precision Power are trademarks of Apex Microtechnolgy, Inc. All other corporate names noted herein may be trademarks
of their respective holders.
Copyright © Apex Microtechnology, Inc. 2012
(All Rights Reserved)
www.apexanalog.com SEP2012
MP108UREVF