30-PIN DIP
PACKAGE STYLE CL
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FEATURES
• HIGH INTERNAL DISSIPATION — 125 Watts
• HIGH VOLTAGE, HIGH CURRENT — 200V, 10A
• HIGH SLEW RATE — 10V/µs
• 4 WIRE CURRENT LIMIT SENSING
• OPTIONAL BOOST VOLTAGE INPUTS
APPLICATIONS
• LINEAR AND ROTARY MOTOR DRIVES
• YOKE/MAGNETIC FIELD EXCITATION
• PROGRAMMABLE POWER SUPPLIES TO ±95V
• INDUSTRIAL AUDIO
• PACKAGE OPTION - DIP10 - DUAL-IN-LINE
DESCRIPTION
The MP38 is a cost-effective high voltage MOSFET power
operational amplifier constructed with surface mount com-
ponents on a thermally conductive but electrically isolated
substrate.
While the cost is low the MP38 offers many of the same
features and performance specifications found in much more
expensive hybrid power amplifiers.
The metal substrate allows the MP38 to dissipate power
up to 125 watts and its power supply voltages can range up
to +/- 100 Volts (200V total). Optional boost voltage inputs
allow the small signal portion of the amplifier to operate at
higher supply voltages than the high current output stage.
The amplifier is then biased to achieve close linear swings
to the supply rails at high current for extra efficient operation.
External compensation tailors performance to the user needs.
A four-wire sense technique allows current limiting without
the need to consider internal or external mili-ohm parasitic
resistance in the output line. An Iq pin is available which can
be used to shut off the quiescent current in the output stage.
The output stage then operates class C and lowers quiescent
power dissipation. This is useful in applications where output
crossover distortion is not important.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATION REF: APPLICATION NOTE 25
The high power bandwidth and high voltage output of the
MP38 allows driving ultra-sonic transducers via a resonant
circuit including the transducer and a matching transformer.
The load circuit appears resistive to the MP38.
EXTERNAL CONNECTIONS
* SEE "BYPASSING" PARAGRAPH
Phase Compensation
Gain Cc Rc
1 470pF 100Ω
≥ 3 220pF Short
≥ 10 100pF Short
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ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +VS to –VS 200V
BOOST VOLTAGE ±VS ±20V
OUTPUT CURRENT, within SOA 25A
POWER DISSIPATION, internal 125W
INPUT VOLTAGE, differential ±20V
INPUT VOLTAGE, common mode ±VB
TEMPERATURE, pin solder - 10s 200°C
TEMPERATURE, junction2 175°C
TEMPERATURE, storage –40 to +105°C
OPERATING TEMPERATURE RANGE, case –40 to +85°C
MP38
SPECIFICATIONS
NOTES:
1. Unless otherwise noted: TC = 25°C, RC = 100Ω, CC = 470pF. DC input specifications are ± value given. Power supply voltage is
typical rating. ±VB = ±VS.
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation
to achieve high MTTF. For guidance, refer to the heatsink data sheet.
3. Rating applies if the output current alternates between both output transistors at a rate faster than 60 Hz.
4. The MP38 must be used with a heat sink or the quiescent power may drive the unit to junction temperatures higher than 175°C.
The MP38 is constructed from MOSFET transistors. ESD handling procedures must be observed.
PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS
INPUT
OFFSET VOLTAGE, initial 5 10 mV
OFFSET VOLTAGE, vs. temperature Full temperature range 30 50 µV/°C
OFFSET VOLTAGE, vs. supply 15 µV/V
OFFSET VOLTAGE, vs. power Full temperature range 30 µV/W
BIAS CURRENT, initial 10 200 pA
BIAS CURRENT, vs. supply .01 pA/V
OFFSET CURRENT, initial 10 50 pA
INPUT IMPEDANCE, DC 1010 Ω
INPUT CAPACITANCE 20 pF
COMMON MODE VOLTAGE RANGE Full temperature range ±VB 15 ±VB 12 V
COMMON MODE REJECTION, DC Full temp, range, VCM= ±20V 86 98 dB
INPUT NOISE 100kHz BW, RS = 1KΩ 10 µVrms
GAIN
OPEN LOOP, @15Hz Full temperature range, CC = 100pF 94 113 db
GAIN BANDWIDTH PRODUCT IO=10A 2 MHz
POWER BANDWIDTH RL=20Ω, VO = 180V p-p 20 kHz
CC = 100pF
PHASE MARGIN Full temperature range 60 °
OUTPUT
VOLTAGE SWING IO=10A ±VS 8.8 ±VS 6.6 V
VOLTAGE SWING ±VB = ±VS ±10V, IO=10A ±VS 6.8 ±VS 4 V
SETTLING TIME to .1% AV=+1,10V step, RL =4Ω 2.5 µs
SLEW RATE AV= –10, CC= 100pF 10 V/µs
CAPACITIVE LOAD Full temperature range, AV=+1 10 nF
RESISTANCE 4 Ω
CURRENT, CONTINUOUS 10 A
POWER SUPPLY
VOLTAGE Full temperature range ±15 ±75 ±100 V
CURRENT, quiescent, boost supply 22 mA
CURRENT, quiescent, total 26 mA
THERMAL
RESISTANCE, AC, junction to case3 Full temperature range, F>60Hz .9 °C/W
RESISTANCE, DC, junction to case Full temperature range, F<60Hz 1.2 °C/W
RESISTANCE4, junction to air Full temperature range 12 °C/W
TEMPERATURE RANGE, case Meets full range specification -40 85 °C
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CAUTION
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TYPICAL PERFORMANCE
GRAPHS MP38
GENERAL
Please read Application Note 1 "General Operating Con-
siderations" which covers stability, supplies, heat sinking,
mounting, current limit, SOA interpretation, and specification
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.
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 24 must be connected to the amplifier
output side and pin 23 connected to the load side of the
current limit resistor, RCL, as shown in Figure 1. This con-
nection will bypass any parasitic resistances, Rp, formed by
sockets and solder joints as well as internal amplifier losses.
The current limiting resistor may not be placed anywhere in
the output circuit except where shown in Figure 1.
The value of the current limit resistor can be calculated as
follows:
.7
RCL =
I LIMIT
BOOST OPERATION
With the VB feature the small signal stages of the amplifier
are operated at higher supply voltages than the amplifier's high
current output stage. +VS (pins 12-14) and –VS (pins 18-20)
are connected to the high current output stage. An additional
10V on the VB pins is sufficient to allow the small signal stages
to drive the output transistors into saturation and improve the
output voltage swing for extra efficient operation when required.
When close swing to the supply rails is not required the +VB
and +VS pins must be strapped together as well as the –VB
and –VS pins. The boost voltage pins must not be at a voltage
lower than the VS pins.
BYPASSING
Proper bypassing of the power supply pins is crucial for proper
operation. Bypass the ±Vs pins with a aluminum electrolytic
capacitor with a value of at least 10µF per amp of expected
output current. In addition a .47µF to 1µF ceramic capacitor
should be placed in parallel with each aluminum electrolytic
capacitor. Both of these capacitors have to be placed as close
to the power supply pins as physically possible. If not connected
to the Vs pins (See BOOST OPERATION) the VB pins should
also be bypassed with a .47µF to 1µF ceramic capacitor.
USING THE IQ PIN FUNCTION
Pin 25 (Iq) can be tied to pin 6 (Cc1) to eliminate the class
AB biasing current from the output stage. Typically this would
remove 1-4 mA of quiescent current. The resulting decrease
in quiescent power dissipation may be important in some
applications. Note that implementing this option will raise the
output impedance of the amplifier and increase crossover
distortion as well.
COMPENSATION
The external compensation components CC and RC are con-
nected to pins 4 and 6. Unity gain stability can be achieved at
any compensation capacitance greater than 470 pF with at
least 60 degrees of phase margin. At higher gains more phase
shift can be tolerated in most designs and the compensation
capacitance can accordingly be reduced, resulting in higher
bandwidth and slew rate.
APPLICATION REFERENCES
For additional technical information please refer to the fol-
lowing application notes.
AN 1 General Operating Considerations
AN 11 Thermal Techniques
AN 38 Loop Stability with Reactive Loads
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
MP38
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
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This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice.
MP38U REV F NOVEMBER 2004 © 2004 Apex Microtechnology Corp.
