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HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER
PA45
MICROTECHNOLOGY
HTTP://WWW.APEXMICROTECH.COM
(800) 546-APEX
(800) 546-2739
FEATURES
* * * * * MONOLITHIC MOS TECHNOLOGY LOW COST HIGH VOLTAGE OPERATION--150V HIGH SLEW RATE--27V/s HIGH POWER--5A, 85W DISSIPATION
PATENTED
APPLICATIONS
* * * * MAGNETIC DEFLECTION PA AUDIO MOTOR DRIVE NOISE CANCELLATION
TYPICAL APPLICATION
+80 RC
3 4 2 7 8
CC RCL CF YOKE -20 RD RF
DESCRIPTION
The PA45 is a high power monolithic MOSFET operational amplifier that achieves performance levels unavailable even in many hybrid amplifier designs. Inputs are protected from excessive common mode and differential mode voltages as well as static discharge. The safe operating area (SOA) has no second breakdown limitations and can be observed with all type loads by choosing an appropriate current limiting resistor. External compensation provides the user flexibility in choosing optimum gain and bandwidth for the application. This circuit utilizes a beryllia (BeO) substrate to minimize thermal resistance. Ultrasonically bonded aluminum wires provide reliable interconnections at all operating temperatures. The 8-pin TO-3 package is hermetically sealed and electrically isolated. The use of compressible isolation washers and/or improper mounting torque will void the product warranty.
VI RI
PA45
5 6 1
2.5A 7Sec Retrace Horizontal Deflection Coil Amplifiers
RS
EQUIVALENT SCHEMATIC
3 +VS D1 Q24 Q5 Q3 Q8 D2 D4 -IN 5 4 +IN Q20 -VS 6 Q21 D7 D5 Q11 Q12 CC1 2 7 CC2 D3 Q13 Q14 Q15 Q16 Q17 Q19
1 CURRENT SENSE
Horizontal deflection amplifiers require both high speed and low distortion. The speed at which current can be changed in a deflection coil is a function of the voltage available from the op amp. In this application an 80 volt power supply is used for the retrace polarity to provide a 7 Sec retrace time, half of which is required for amplifier slewing. This circuit can perform 15.75 KHz deflection in up to 50H coils at up to 5A p-p.
EXTERNAL CONNECTIONS
Q2
+VS CC1 OUTPUT 2 CURRENT SENSE 1
Q6 Q7 Q9 Q10 OUTPUT DRIVE 8
+IN 4
3
CC RC
TOP VIEW 5 -IN -VS 6 7 CC2 8 OUTPUT DRIVE
R CL
C C IS NPO RATED FOR FULL SUPPLY VOLTAGE.
PHASE COMPENSATION
Gain 10 1 CC 10pF 68pF RC 1K 1K
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
PA45
ABSOLUTE MAXIMUM RATINGS
ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS
SUPPLY VOLTAGE, +VS to -VS OUTPUT CURRENT, continuous within SOA POWER DISSIPATION, continuous @ TC = 25C INPUT VOLTAGE, differential INPUT VOLTAGE, common mode TEMPERATURE, pin solder - 10 sec TEMPERATURE, junction TEMPERATURE, storage TEMPERATURE RANGE, powered (case)
150V 5A 85W 16 V VS 300C 150C -65 to +150C -55 to +125C
SPECIFICATIONS
PARAMETER INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature OFFSET VOLTAGE, vs supply OFFSET VOLTAGE, vs time BIAS CURRENT, initial BIAS CURRENT, vs supply OFFSET CURRENT, initial INPUT IMPEDANCE, DC INPUT CAPACITANCE COMMON MODE, voltage range COMMON MODE REJECTION, DC NOISE, broad band GAIN OPEN LOOP at 15Hz GAIN BANDWIDTH PRODUCT @ 1MHz POWER BANDWIDTH PHASE MARGIN OUTPUT VOLTAGE SWING CURRENT, continuous SETTLING TIME to .1% SLEW RATE CAPACITIVE LOAD RESISTANCE , no load POWER SUPPLY VOLTAGE3 CURRENT, quiescent THERMAL2 RESISTANCE, AC junction to case RESISTANCE, DC junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case TEST CONDITIONS1 MIN TYP MAX UNITS
Full temperature range
5 10 8 20
10 50 15 2 100 2 200
VS-10 90 10kHz BW, RS = 1K
1011 5 106 10
mV V/C V/V V kh pA pA/V pA pF V dB V RMS
94 RL = 500, CC = 10pF CC = 10pF, 130V p-p, RL = 8 Full temp range, CC = 68pF, RL = 10 VS-10 5
106 4.5 66 60 VS-8 2 27
dB MHz kHz
IO = 5A 10V step, AV = -10 CC = 10pF, RL = 8 AV = +1, CC = 68pF RCL = 0
10 150 15 50 30 75 50
V A s V/s nF
See Note 3
V mA C/W C/W C/W C
F > 60Hz F < 60Hz Full temperature range Meets full range specifications
1.3 1.5 30 -25 +85
NOTES: 1. 2. 3.
Unless otherwise noted TC = 25C, CC = 10pF, RC = 1K. DC input specifications are value given. Power supply voltage is typical rating. 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 heatsink data sheet. Derate maximum supply voltage .5 V/C below case temperature of 25C. No derating is needed above TC = 25C. The PA45 is constructed from MOSFET transistors. ESD handling procedures must be observed. The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or subject to temperatures in excess of 850C to avoid generating toxic fumes.
CAUTION
APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739
TYPICAL PERFORMANCE GRAPHS
PA45
NORMALIZED CURRENT LIMIT, ILIM (X)
INTERNAL POWER DISSIPATION, P(W)
POWER DERATING
100 80 60 40 20 0 0 25 50 75 100 125 CASE TEMPERATURE, TC (C)
CURRENT LIMIT DRIFT
1.2 1.1 1.0 0.9 0.8 0.7 -50 -25 0 25 50 75 100 125 CASE TEMPERATURE, TC (C) 0 4
ABSOLUTE CURRENT LIMIT
CURRENT LIMIT, I (A)
+I LIM
0
-I LIM -4 1.0 0.1 10 CURRENT LIMIT RESISTOR, R CL ()
SMALL SIGNAL RESPONSE
120
OPEN LOOP GAIN, A(dB)
PHASE RESPONSE
200
OUTPUT VOLTAGE, VO (VPP )
POWER RESPONSE
-45 80
PHASE, ()
CC = 10pF
CC = 10pF
100 80 60 40 CC = 68pF 20
CC = 10pF
-90 CC = 68pF -135 RL = 500 -180 .1 1 10 100 1K 10K 100K 1M 10M FREQUENCY, f (Hz)
40
CC = 68pF RL = 1K RL = 500 1 10 100 1K 10K 100K 1M 10M FREQUENCY, f (Hz)
0 .1
R L = 8 10 8 6 4 10K 20K 40K 100K 200K 400K FREQUENCY, f (Hz)
1M
HARMONIC DISTORTION
1.000 .400
DISTORTION, THD (%)
SLEW RATE
50
SLEW RATE, SR(V/s)
VOLTAGE DROP FROM SUPPLY, VS - VO (V) NORMALIZED QUIESCENT CURRENT, IQ(X)
QUIESCENT CURRENT
T
C
.100 .040 .020 .010 .004 1W .002 5W .001 10 20 40 100 400 1K 2K 4K 10K 20K FREQUENCY, f (Hz) 85W
1.5
=
-5
.200
40 No Load
5 C
AV = 10 CC = 10pf RL = 8
2.0
30
= TC
25
C
1.0
TC = +12 5C
20 8 Load
10 0 20 40 60 80 COMPENSATION CAPACITANCE, C C (pF)
POWER SUPPLY REJECTION, PSR (dB)
0.5 10 30 50 70 90 110 130 150 TOTAL SUPPLY VOLTAGE, VS (V)
COMMON MODE REJECTION, CMR (dB)
COMMON MODE REJECTION
100
POWER SUPPLY REJECTION
120 100 +VS 80 60 40 -VS 20 0 10
OUTPUT VOLTAGE SWING
10
85C -OUT
80
8
60
85C +OUT
6
40
4
25C +OUT 25C - OUT
20 10
100 1K 10K 100K FREQUENCY, f (Hz)
1M
100 1K 10K 100K FREQUENCY, f (Hz)
1M
2 0 2 4 OUTPUT CURRENT, I O (A)
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
PA45
GENERAL
Please read the General Operating Considerations section, which covers stability, supplies, heat-sinking, mounting, current limit, SOA interpretation, and specification interpretation. Additional information can be found in the application notes. For information on the package outline, heatsink, and mounting hardware, consult the "Accessories Information" and "Packaging" mechanical data section of the data book.
OPERATING CONSIDERATIONS
SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational amplifier has limitations from its channel temperature. NOTE: The output is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast-recovery diodes should be used. SAFE OPERATING AREA
6.0 OUTPUT CURRENT FROM +VS OR -VS, (A) 4.0
20
10 0
CURRENT LIMIT
Current limiting is achieved by developing 0.83V on the amplifiers current sense circuit by way of an internal tie to the output drive (pin 8) and an external current sense line (pin 1). A sense resistor RCL is used to relate this sense voltage to a current flowing from output drive. 0.83 - 0.05 * ICL RCL = ICL ICL = 0.83 RCL + 0.05
2.0
DC
0m
m
S
,T
DC
S
C
1.0 0.8 0.6 0.4
DC
=
,T
85 C
C
=
12
5
C
with a maximum practical value of 16. RCL is added to the typical value of output resistance and affects the total possible swing since it carries the load current. The swing reduction, VR can be established VR = IOUT * RCL.
0.2 PULSE CURVES @ 10% DUTY CYCLE MAX 4 6 8 10 20 40 60 100 200 SUPPLY TO OUTPUT DIFFERENTIAL, VS -VO (V)
INPUT PROTECTION
The PA45 inputs are protected against common mode voltages up to the supply rails, differential voltages up to 16 volts and static discharge. Differential voltages exceeding 16 volts will be clipped by the protection circuitry. However, if more than a few milliamps of current is available from the input drive source, the protection circuitry could be destroyed. The protection circuitry includes 300 ohm current limiting resistors at each input. This security may be insufficient for severe overdrive of the input. Adding external resistors to the application which limits severe input overdrive current to 1mA, will prevent damage.
0.1
STABILITY
The PA45 has sufficient phase margin when compensated for unity gain to be stable with capacitive loads of at least 10nF. However, the low pass circuit created by the sum-point (-in) capacitance and the feedback network may add phase shift and cause instabilities. As a rule, the sum-point load resistance (input and feedback resistors in parallel) should be 1k ohm or less. Alternatively, use a bypass capacitor across the feedback resistor. The time constant of the feedback resistor and bypass capacitor combination should match the time constant of the sum-point resistance and sum-point capacitance. The PA45 is externally compensated and performance can be tailored to the application. The compensation network CCRC must be mounted closely to the amplifier pins 7 and 2 to avoid noise coupling to these high impedance nodes.
This data sheet has been carefully CORPORATION * 5980 NORTH SHANNON ROAD assumed for possible inaccuracies * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739 APEX MICROTECHNOLOGY checked and is believed to be reliable, however, no responsibility*is TUCSON, ARIZONA 85741 or omissions. All specifications are subject to change without notice. PA45U REV. B FEBRUARY 1998 (c) 1998 Apex Microtechnology Corp.

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