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HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER
PA140
MICROTECHNOLOGY
HTTP://WWW.APEXMICROTECH.COM
(800) 546-APEX
(800) 546-2739
FEATURES
* * * * * * MONOLITHIC MOS TECHNOLOGY LOW COST HIGH VOLTAGE OPERATION--350V, 250V DERATE LOW QUIESCENT CURRENT--2mA NO SECOND BREAKDOWN HIGH OUTPUT CURRENT--120 mA PEAK
APPLICATIONS
* * * * * TELEPHONE RING GENERATOR PIEZO ELECTRIC POSITIONING ELECTROSTATIC TRANSDUCER & DEFLECTION DEFORMABLE MIRROR FOCUSING PACKAGING OPTIONS 7TO-220 Plastic Package (PA140CD) 7TO-220 with staggered Lead Form (PA140CX) 7 DDPAK Surface Mount Package (PA140CC)
TYPICAL APPLICATON
Ref Application Note 31 "Basic Op Amp Theory and Practice"
R V IN 20R 20R 20R +175 2.2K 2.2K 10pF A1 PA140 100 330pF PIEZO TRANSDUCER 10pF A2 PA140 +175
DESCRIPTION
The PA140 is a high voltage monolithic MOSFET operational amplifier achieving performance features previously found only in hybrid designs while increasing reliability. Inputs are protected from excessive common mode and differential mode voltages. The safe operating area (SOA) has no second breakdown limitations. External compensation provides the user flexibility in choosing optimum gain and bandwidth for the application. The PA140 is packaged in three standard package designs. The surface mount version of the PA140, the PA140CC, is an industry standard non-hermetic plastic 7-pin DDPAK. The through hole versions of the PA140, the PA140CD, and the PA140CX, are industry standard non-hermetic plastic 7-pin TO-220 packages. The PA140CX is a staggered lead formed PA140CD and offers industry standard 100 mil spacing, this allows for easier PC board layout. (Please reference to the lead form datasheet drawing LF005 for package dimensions of the PA140CX.) High voltage considerations should be taken when designing board layouts for the PA140. The PA140CD may require a derate in supply voltage depending on the spacing used for board layout. The 15-mil and 14-mil minimum spacing of the 7TO-220 and 7DDPAK respectively is adequate to standoff the 350V rating of the PA140. However, a supply voltage derate to 250V is required if the spacing of circuit board artwork is less than 11 mils. In cases where the PA140 is used to it's maximum voltage rating, the PA140BP is recommended given that the staggered lead form allows for 100-mil standard spacing. The monolithic amplifier is directly attached to the metal tabs of the PA140CC, PA140CD, and PA140CX. The metal tabs are directly tied to -VS The PA140 is set for a gain of 38.5 boosting the 2.33V signal to 90V. The recommended compensation for gains above 30 is used. If capacitive loading is at least 330pF at all times, the recommended snubber network may be omitted.
Rn Cn
100 330pF
LOW COST 660V p-p PIEZO DRIVE
-175
-175
EXTERNAL CONNECTIONS
PA140CD PA140CC PA140CX
-IN +IN +Vs -Vs OUT COMP (RC) COMP (CC)
PHASE COMPENSATION
Gain 1 10 30 CC 18pF 10pF 3.3pF RC 2.2K 2.2K 2.2K
-IN +IN+ +Vs -Vs OUT COMP (RC) COMP (CC)
C S,CC ARE RATED FOR FULL SUPPLY VOLTAGE. CC is NPO R CL = 3 I LIM
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
-IN +IN +Vs -Vs OUT COMP(RC) COMP(CC)
PA140
ABSOLUTE MAXIMUM RATINGS
ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS
SUPPLY VOLTAGE, +VS to -VS DERATED SUPPLY VOLTAGE +VS to -VS OUTPUT CURRENT, continuous within SOA OUTPUT CURRENT, peak POWER DISSIPATION, continuous @ TC = 25C INPUT VOLTAGE, differential INPUT VOLTAGE, common mode TEMPERATURE, pin solder - 10 sec TEMPERATURE, junction2 TEMPERATURE, storage TEMPERATURE RANGE, powered (case) PA140
TEST CONDITIONS
1
350V 250V 60 mA 120 mA 14W 16 V VS 220C 150C -65 to +150C -40 to +125C
SPECIFICATIONS
PARAMETER INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature4 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 NOISE, low frequency GAIN OPEN LOOP at 15Hz BANDWIDTH, open loop POWER BANDWIDTH PHASE MARGIN OUTPUT VOLTAGE SWING CURRENT, peak5 CURRENT, continuous SETTLING TIME to .1% SLEW RATE CAPACITIVE LOAD RESISTANCE6, n o load RESISTANCE6, 20 mA load POWER SUPPLY VOLTAGE3 CURRENT, quiescent THERMAL RESISTANCE, AC junction to case6 RESISTANCE, DC junction to case6 RESISTANCE, junction to air TEMPERATURE RANGE, case NOTES: 1. 2. 3. 4. 5. MIN
TYP 15 70 20 75 50 2 50 1011 5
MAX 30 130 32 200 20 200
UNITS mV V/C V/V V kh pA pA/V pA pF V dB V RMS V p-p
Full temperature range
VCM = 90V DC 10kHz BW, RS = 1K 1-10 Hz
VS-12 84
94 50 110
RL = 5K CC = 10pf, 280V p-p Full temperature range
94
106 1.6 26 60
dB MHz kHz
IO = 40mA
VS-12 60
VS-10 120
CC = 10pF, 10V step, AV = -10 CC = OPEN AV = +1 RCL = 0 RCL = 0
12 40 10 150 25
V mA mA s V/s nF
See Note 3
50
150 1.6
175 2.0
V mA
F > 60Hz F < 60Hz Full temperature range Meets full range specifications
5.9 7.7 -25 25
6.85 8.9 +85
C/W C/W C/W C
Unless otherwise noted TC = 25C, CC = 18pF, RC = 2.2K. 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. Derate maximum supply voltage .5 V/C below case temperature of 25C. No derating is needed above TC = 25C. Sample tested by wafer to 95%. Guaranteed but not tested.
CAUTION
The PA140 is constructed from MOSFET transistors. ESD handling procedures must be observed.
APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739
TYPICAL PERFORMANCE GRAPHS
PA140
0 -30 -60 PHASE, () -90 -120 -150 -180 CC = 18pF CC = 3.3pF
INTERNAL POWER DISSIPATION, P(W)
POWER DERATING
16 14 12 10 8 6 4 2
PHASE RESPONSE
400 CC = 3.3pF CC = 10pF CC = 18pF OUTPUT VOLTAGE, VO (VPP )
POWER RESPONSE
R L = 10K
200 CC = 10pF 100 80 60 40 CC = 18pF 20 10K 20K30K 50K .1M .2M .3M .5M FREQUENCY, F (Hz) CC = 3.3pF
0 0 25 50 75 100 TEMPERATURE, Tj (C) 125
-210
CC = 10pF 1 10 100 1K 10K .1M 1M 10M FREQUENCY, F (Hz)
1M
120 OPEN LOOP GAIN, A(dB) 100 CC = 3.3pF SLEW RATE, V/s 80 60 40 CC = 18pF 20 0 1 10 100 1K 10K .1M 1M 10M FREQUENCY, F (Hz) POWER SUPPLY REJECTION, PSR (dB) CC = 10pF
SLEW RATE
60 50 40 30 20 10 0 0 4 8 12 16 20 COMPENSATION CAPACITANCE, C C (pf)
NORMALIZED QUIESCENT CURRENT, (%)
SMALL SIGNAL RESPONSE
QUIESCENT CURRENT
150 130 110
TC
90
=8
5C
5C
5C
TC
70
=2
TC
= -2
-20
50 100 150 200 300 350 250 TOTAL SUPPLY VOLTAGE, VS (V)
HARMONIC DISTORTION
1.0 .6 .4 DISTORTION, (%) .2 .1 .06 .04 .02 AV = 20 CC = 3.3pf R L = 2K VO = 30VPP VO = 180VPP VO = 60VPP
POWER SUPPLY REJECTION
120 100 80 60 40 20 0 1 10 100 1K 10K .1M FREQUENCY, F (Hz) 1M -VS +VS
VOLTAGE DROP FROM SUPPLY, VS - VO (V)
OUTPUT VOLTAGE SWING
18 16 14 12 10 8 6 4 2 0
T - OU 85C
- OUT 25C - OUT -25C
.01 .006 .004 .002 100 200 1K 3K 10K 30K 100K FREQUENCY, F (Hz) 120 100 80 60 40 20 0 1 10 100 1K 10K .1M FREQUENCY, F (Hz) 1M
T -25C +OU 85C +OUT
25C +OUT
0 20 40 60 80 100 120 OUTPUT CURRENT, I O (mA)
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
COMMON MODE REJECTION, CMR (dB)
COMMON MODE REJECTION
PA140
GENERAL
Please read Application Note 1 "General Operating Considerations" 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.
OPERATING CONSIDERATIONS
heatsink on the backside of the FR4/PC board, or copper slug. Do not allow the temperature to exceed 85C. The heatslug is tied internally to -VS.
EQUIVALENT SCHEMATIC
3
INPUT PROTECTION
The PA140 inputs are protected against common mode voltages up the supply rails and differential voltages up to 16 volts as well as 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 overload source, the protection circuitry could be destroyed. The protection circuitry includes 300 ohm current limiting resistors at each input, but this may be insufficient for severe overloads. It may be necessary to add external resistors to the application circuit where severe overload conditions are expected. Limiting input current to 1mA will prevent damage.
Q1
D1 Q2 Q3 Q4
1
+VS
IOUT
5
Q5
6
Q6
-IN D2
2
COMP D3 D4 D5 COMP Q8
7
+IN Q11 Q12 Q13 Q10 Q14 -VS
4
STABILITY
The PA140 has sufficient phase margin when compensated for unity gain to be stable with capacitive loads of at least 10 nF. However, the low pass circuit created by the sumpoint (-in) capacitance and the feedback network may add phase shift and cause instabilities. As a general rule, the sumpoint load resistance (input and feedback resistors in parallel) should be 1K ohm or less at low gain settings (up to 10). 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 sumpoint resistance and sumpoint capacitance. The PA140 is externally compensated and performance can be tailored to the application. Use the graphs of small signal gain and phase response as well as the graphs for slew rate and power response as a guide. The compensation capacitor CC must be rated at 350V. The compensation capacitor and associated resistor RC must be mounted closely to the amplifier pins to avoid spurious oscillation. An NPO capacitor is recommended for compensation. The PA140 monolithic amplifier uses an all NMOS output topology that presents a special stability problem. An output snubber network of 330pF and 100 in series from the output to -VS will eliminate this problem. This network is not required if the load capacitance is greater than 330pF.
SUB
SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational amplifier has two distinct limitations: 1. The current handling capability of the die metallization. 2. The temperature of the output MOSFETs. NOTE: The output stage is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast-recovery diodes should be used.
PA140 SOA
200mS 300mS
200 OUTPUT CURRENT FROM +VS OR -VS, (mA) 120 100
50 40 30 20
DC
,T
DC
C
=
,T C=
85 C
25
C
10
MOUNTING
The PA140CC 7-pin DDPAK surface mountable package has a large exposed integrated copper heatslug to which the monolithic amplifier is directly attached. The PA140CC requires surface mount techniques of heatsinking. A solder connection to an area of 1 to 2 square inches of foil is recommended for circuit board layouts. This may be adequate heatsinking but the large number of variables involved suggests temperature measurements to be made on the top of the package. Surface mount techniques include the use of a surface mount fan in combination with a surface mount
5 4 3 2 10 20 30 50 100 200 300 500
APPLICATION REFERENCES:
For additional technical information please refer to the following Application Notes: AN 01: General Operating Considerations AN 25: Driving Capacitive Loads AN 38: Loop Stability with Reactive Loads
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. APEX MICROTECHNOLOGY CORPORATION * 5980 PA140U REV. A FEBRUARY 2002 (c) 2002 Apex Microtechnology Corp.USA * APPLICATIONS HOTLINE: 1 (800) 546-2739 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 *

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