APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
1
H T T P : / / W W W . A P E X M I C R O T E C H . C O M ( 8 0 0 ) 5 4 6 - A P E X ( 8 0 0 ) 5 4 6 - 2 7 3 9
M I C R O T E C H N O L O G Y
POWER OPERATIONAL AMPLIFIER
MP108FD
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
DESCRIPTION
The MP108FD operational amplifi er is a surface mount
constructed component that provides a cost effective
solution in many industrial applications. The MP108FD offers
outstanding performance that rivals much more expensive
hybrid components yet has a footprint of only 4 sq in. The
MP108FD 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 MP108FD makes
it a good choice for piezo transducer drive applications. The
MP108FD is built on a thermally conductive but electrically
insulating substrate that can be mounted to a heat sink.
EQUIVALENT CIRCUIT DIAGRAM
34-pin DIP
PACKAGE STYLE FD
TYPICAL APPLICATION
INKJET NOZZLE DRIVE
The MP108FD's fast slew rate and wide power bandwith
make it an ideal nozzle driver for industrial inkjet printers.
The 10 amp output capability can drive hundreds of nozzles
simultaneously.
EXTERNAL CONNECTIONS
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
C
C
+V
S
-V
S
OUT
C
C
2
C
C
1
GND
GND
+V
B
+V
S
-V
B
-V
S
-I
LIM
+I
LIM
R
LIM
R
F
R
I
PIEZO
TRANSDUCER
PRINT
NOZZLE
COMMAND
VOLTAGE
-IN
+IN
+V
B
-V
B
C
C
2
GND
GND
1
2
3
4
5
6
7
8
31
32
29
30
28
27
26
25
33
34
C
C
1
-I
LIM
+I
LIM
C
C
NOTES:
C
C
IS NPO (COG) RATED FOR FULL SUPPLY VOLTAGE +V
S
TO -V
S
BOTH PINS 3 AND 32 REQUIRED CONNECTED TO SIGNAL GROUND
C2 AND C3 ELECTROLYTIC 10F PER AMP OUTPUT CURRENT
C1,C4,C5-8 HIGH QUALITY CERAMIC 0.1F
ALL OUTPUT PINS MUST BE TIED TOGETHER
VIEW FROM COMPONENT SIDE
PHASE COMPENSATION
GAIN W/O BOOST
1
4
10
C
C
100pF
33pF
10pF
+
C1
C2
C4
+
C3
R
LIM
9
10
11
12
22
24
23
21
+V
S
+V
S
+V
S
OUT
NC
13
14
15
16
17
18
19
20
OUT
OUT
-V
S
-V
S
-V
S
LOAD &
FEEDBACK
-V
B
NC
NC
+V
B
TYP. SLEW RATE
55 V/S
135 V/S
170 V/S
OUT
OUT
OUT
BACK
PLT
TP
NC
NC
NC
NC
NC
C5
C6
C7
C8
GAIN W BOOST
1
3
10
C
C
470pF
220pF
33pF
TYP. SLEW RATE
12 V/S
35 V/S
135 V/S
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
2
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
MP108FD
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PARAMETER TEST CONDITIONS
1
MIN
TYP
MAX
UNITS
INPUT
OFFSET VOLTAGE
1
5
mV
OFFSET VOLTAGE vs. temperature Full temperature range
20
50
V/C
OFFSET VOLTAGE vs. supply
20 V/V
BIAS CURRENT, initial
3
100
pA
BIAS CURRENT vs. supply
0.1
pA/V
OFFSET CURRENT, initial
50
pA
INPUT RESISTANCE, DC
10
11
INPUT CAPACITANCE
4
pF
COMMON MODE VOLTAGE RANGE
+V
B
- 15
V
COMMON MODE VOLTAGE RANGE
-V
B
+ 15
V
COMMON MODE REJECTION, DC 92
dB
NOISE 1MHz bandwidth, 1k R
S
10
V RMS
GAIN
OPEN LOOP @ 15Hz R
L
= 10K, C
C
= 10pF 96
dB
GAIN BANDWIDTH PRODUCT @ 1MHz C
C
= 10pF
10
MHz
PHASE MARGIN Full temperature range 45
degrees
OUTPUT
VOLTAGE SWING I
O
= 10A +V
S
- 10
+V
S
- 8.6
V
VOLTAGE SWING I
O
= -10A -V
S
+ 10
-V
S
+ 7
V
VOLTAGE SWING I
O
= 10A, +V
B
= +V
S
+10V +V
S
- 1.6
V
VOLTAGE SWING I
O
= -10A, -V
B
= -V
S
-10V -V
S
+ 5.1
V
CURRENT, continuous, DC 10 A
SLEW RATE, A
V
= -20 C
C
= 10pF 150
170
V/S
SETTLING TIME, to 0.1% 2V Step
1
S
RESISTANCE No load, DC
5
POWER BANDWIDTH 180V
P-P
C
C
= 10pF, +V
S
= 100V, -V
S
= -100V
300
kHz
POWER SUPPLY
VOLTAGE 15
75
100
V
CURRENT, quiescent
50
65
mA
THERMAL
RESISTANCE, AC, junction to case
5
Full temperature range, f 60Hz
1
C/W
RESISTANCE, DC, junction to case Full temperature range, f < 60Hz
1.25
C/W
RESISTANCE, junction to air Full temperature range
13
C/W
TEMPERATURE RANGE, case -40
85
C
SUPPLY VOLTAGE, +V
S
to -V
S
200V
SUPPLY VOLTAGE, +V
B
+V
S
+ 15V
6
SUPPLY VOLTAGE, -V
B
-V
S
15V
6
OUTPUT CURRENT, peak 12A, within SOA
POWER DISSIPATION, internal, DC 100W
INPUT VOLTAGE +V
B
to -V
B
TEMPERATURE, pin solder, 10s 225C.
TEMPERATURE, junction
2
150C.
TEMPERATURE RANGE, storage -40 to 105C.
OPERATING TEMPERATURE, case -40 to 85C.
NOTES:
1. Unless otherwise noted: T
C
=25C, compensation C
C
=100pF, DC input specifi cations are value given, power supply 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 MTBF.
3. Doubles for every 10C of case temperature increase.
4. +V
S
and -V
S
denote the positive and negative supply voltages to the output stage. +V
B
and -V
B
denote 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 +V
B
and -V
B
must not be less than +V
S
and -V
S
respectively.
APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
3
TYPICAL PERFORMANCE
GRAPHS
MP108FD
-40 -20
0
20
40
60
80 100
0
20
40
60
80
100
INTERNAL POWER DISSIPATION, P(W)
POWER DERATING
CASE TEMPERATURE, T
C
(C)
1
10
100
SUPPLY TO OUTPUT DIFFERENTIAL, V
S
-V
O
(V)
1
10
200
0.2
20
OUTPUT CURRENT FROM +V
S
OR -V
S
(A)
SAFE OPERATING AREA
10mS, T
C
=25
C
DC, T
C
=25
C
100mS, T
C
=25
C
DC, T
C
=85
C
-50
-25
0
25
50
75
100
70
80
90
100
110
120
130
NORMALIZED CURRENT LIMIT, (%)
CASE TEMPERATURE, T
C
(C)
CURRENT LIMIT
QUIESCENT CURRENT vs. TEMPERATURE
NORMALIZED QUIESCENT
CURRENT
, I
O
(%)
CASE TEMPERATURE, (C)
0
20
40
60
-20
-40
105
100
95
90
115
80 100
110
QUIESCENT CURRENT vs. SUPPLY
NORMALIZED QUIESCENT
CURRENT
, I
O
(%)
TOTAL SUPPLY VOLTAGE, V
S
(V)
80
120
160
200
40
0
100
80
60
40
120
T
C
= 85C
T
C
= -40C
T
C
= 25C
HARMONIC DISTORTION
DISTORTION, THD (%)
FREQUENCY, F (Hz)
30
30K
10K
1K
100
A
V
= 20
C
C
= 10pF
V
S
= 52V
R
L
= 4
P
O
=
200W
P
O
= 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
1M
100K
10K
1K
100
10M
120
100
80
60
40
20
0
C
C
= 10pF
C
C
= 33pF
C
C
= 100pF
R
L
= 4
I
O
= 1A DC
SMALL SIGNAL RESPONSE W/ BOOST
FREQUENCY, F (Hz)
OPEN LOOP GAIN, A (dB)
10
1M
100K
10K
1K
100
10M
120
100
80
60
40
20
0
C
C
= 33pF
C
C
= 220pF
C
C
= 470pF
R
L
= 4
I
O
= 1A
1
FREQUENCY, F (Hz)
OUTPUT VOLTAGE, V
O
(V
P-P
)
200
20
100
10K
100K
1M
5M
POWER RESPONSE
C
C
=10pF
C
C
=33pF
C
C
=100
pF
C
C
=220pF
C
C
=470pF
2
3
2
1
1
PHASE RESPONSE W/ BOOST
FREQUENCY, F (Hz)
PHASE,
(
)
100K
5M
1M
90
120
150
180
210
1 C
C
= 10pF
2 C
C
= 33pF
3 C
C
= 100pF
R
L
= 4
I
O
= 1A
2
3
2
1
1
PHASE RESPONSE W/O BOOST
FREQUENCY, F (Hz)
PHASE,
(
)
300K
10M
1M
90
120
150
180
1 C
C
= 10pF
2 C
C
= 33pF
3 C
C
= 100pF
R
L
= 4
I
O
= 1A
OUTPUT VOLTAGE SWING
OUTPUT CURRENT, I
O
(A)
VOL
T
A
GE DROP
FROM SUPPL
Y
,
(V)
9
8
7
6
5
4
3
2
1
0
0
2
4
6
8
10
W/O BOOST FROM +V
S
W/O BOOST
FROM -V
S
WITH BOOST
FROM
+V
S
WITH BOOST
FRO
M -V
S
T
C
= 25C
50mS PULSE
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
4
OPERATING
CONSIDERATIONS
MP108FD
This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifi cations are subject to change without notice.
MP108 REV B AUGUST 2004 2004 Apex Microtechnology Corp.
GENERAL
Please read Application Note 1 "General Operating
Considerations" which covers stability, power supplies, heat
sinking, mounting, current limit, SOA interpretation, and
specifi cation interpretation. Visit www.apexmicrotech.com for
design tools that help automate tasks such as calculations
for stability, internal power dissipation, current limit, heat sink
selection, Apex's complete Application Notes library, Technical
Seminar Workbook and Evaluation Kits.
GROUND PINS
The MP108FD has two ground pins (pins 3, 32). These pins
provide a return for the internal capacitive bypassing of the
small signal portions of the MP108FD. 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 MP108FD 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 fl yback by
the parasitic body diodes of the output stage MOSFET structure.
However, for protection against sustained high energy fl yback
external fast-recovery diodes must be used.
COMPENSATION
The external compensation capacitor C
C
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 C
C
for the application. An NPO (COG) type capacitor is
required rated for the full supply voltage (200V).
OVERVOLTAGE PROTECTION
Although the MP108FD can withstand differential input voltages
up to 25V, additional external protection is recommended.
In most applications 1N4148 signal diodes connected anti-
parallel across the input pins is suffi 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 usually suffi 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 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 +V
S
and -V
S
must be connected physically close to the pins to prevent local
parasitic oscillation in the output stage of the MP108FD. Use
electrolytic capacitors at least 10F per output amp required.
Bypass the electrolytic capacitors with high quality ceramic
capacitors (X7R) 0.1F or greater. In most applications power
supply terminals +V
B
and -V
B
will be connected to +V
S
and
-V
S
respectively. Supply voltages +V
B
and -V
B
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 amplifi er stage of the MP108FD at pins 8 and 25
must be connected to +V
B
and -V
B
at pins 4 and 30 respectively.
Provide local bypass capacitors at pins 8 and 25. See the
external connections diagram on page 1.
34
33
+Vs
-Vs
OUT
3
32
GND
GND
+Vb
+Vs
-Vb
-Vs
Z1
Z2
-IN
+IN
Q1
Q2
34
OUT
11-13
20-22
33
I
LIM
-
I
LIM
+
27
28
R
P
R
L
IN
R
F
R
LIM
R
IN
FIGURE 1
OVERVOLTAGE PROTECTION
FIGURE 2
4 WIRE CURRENT LIMIT
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 amplifi er output
side and pin 27 connected to the load side of the current limit
resistor R
LIM
as shown in Figure 2. This connection will bypass
any parasitic resistances 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: R
LIM
= .65/I
LIMIT
BOOST OPERATION
With the boost feature the small signal stages of the amplifi er
are operated at a higher supply voltages than the amplifi ers
high current output stage. +V
B
(pins 4,8) and -V
B
(pins 25,30)
are connected to the small signal stages and +V
S
(pins 14-16)
and -V
S
(pins 17-19) are connected to the high current output
stage. An additional 10V on the +V
B
and -V
B
pins is suffi cient
to allow the small signal stages to drive the output stage into
the triode region and improve the output voltage swing for extra
effi cient operation when required. When the boost feature is
not needed +V
S
and -V
S
are connected to the +V
B
and -V
B
pins
respectively. The +V
B
and -V
B
pins must not be operated at
supply voltages less than +V
S
and -V
S
respectively.
BACKPLATE GROUNDING
The substrate of the MP108FD 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 1F capacitor.
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