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VIDEO POWER OPERATIONAL AMPLIFIERS
PA19 * PA19A
MICROTECHNOLOGY
HTTP://WWW.APEXMICROTECH.COM
(800) 546-APEX
(800) 546-2739
FEATURES
* VERY FAST SLEW RATE -- 900 V/s * POWER MOS TECHNOLOGY -- 4A peak rating * LOW INTERNAL LOSSES -- 2V at 2A * PROTECTED OUTPUT STAGE -- Thermal Shutoff * WIDE SUPPLY RANGE -- 15V TO 40V
APPLICATIONS
* VIDEO DISTRIBUTION AND AMPLIFICATION * HIGH SPEED DEFLECTION CIRCUITS * POWER TRANSDUCERS UP TO 5 MHz * MODULATION OF RF POWER STAGES * POWER LED OR LASER DIODE EXCITATION
TYPICAL APPLICATION
This fast power driver utilizes the 900V/s slew rate of the PA19 and provides a unique interface with a current output DAC. By using the DAC's internal 1K feedback resistor, temperature drift errors are minimized, since the temperature drift coefficients of the internal current source and the internal feedback resistor of the DAC are closely matched. Gain of VOUT to IIN is -6.5/mA. The DAC's internal 1K resistor together with the external 500 and 110 form a "tee network" in the feedback path around the PA19. This effective resistance equals 6.5K . Therefore the entire circuit can be modeled as 6.5K feedback resistor from output to inverting input and a 5mA current source into the inverting input of the PA19. Now we see the familiar current to voltage conversion for a DAC where VOUT = -IIN x RFEEDBACK.
DESCRIPTION
The PA19 is a high voltage, high current operational amplifier optimized to drive a variety of loads from DC through the video frequency range. Excellent input accuracy is achieved with a dual monolithic FET input transistor which is cascoded by two high voltage transistors to provide outstanding common mode characteristics. All internal current and voltage levels are referenced to a zener diode biased on by a current source. As a result, the PA19 exhibits superior DC and AC stability over a wide supply and temperature range. High speed and freedom from second breakdown is assured by a complementary power MOS output stage. For optimum linearity, especially at low levels, the power MOS transistors are biased in a class A/B mode. Thermal shutoff provides full protection against overheating and limits the heatsink requirements to dissipate the internal power losses under normal operating conditions. A built-in current limit of 0.5A can be increased with the addition of two external resistors. Transient inductive load kickback protection is provided by two internal clamping diodes. External phase compensation allows the user maximum flexibility in obtaining the optimum slew rate and gain bandwidth product at all gain settings. A heatsink of proper rating is recommended. This hybrid circuit utilizes thick film (cermet) resistors, ceramic capacitors, and silicon semiconductor chips to maximize reliability, minimize size, and give top performance. 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 thermal washers and/or improper mounting torque will void the product warranty. Please see "General Operating Considerations".
EQUIVALENT SCHEMATIC
3
Q1 Q3 Q5
8
Q2
2
Q4 Q7 Q8 Q9 Q10 Q11 Q15
Q12
Q13 Q16 D1 Q20
1
5
Q19 Q21
Q17A
4
Q17B
Q23 D2
6
Q22 Q24 Q25
7
TYPICAL APPLICATION
1K DAC
+40V 5mA RCL+ PA19 RCL- 5.6pF
110 500 32.5V Up to 4A
EXTERNAL CONNECTIONS
RCL+ +V +IN
4 3 2 1
PHASE COMPENSATION OUT CC GAIN 1 10 100 1000 CC 330pF 22pF 2.2pF none
5
TOP VIEW
8 6 7
-IN -V
-40V PA19 AS FAST POWER DRIVER
RCL-
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
PA19 * PA19A
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS to -VS OUTPUT CURRENT, within SOA POWER DISSIPATION, internal INPUT VOLTAGE, differential INPUT VOLTAGE, common mode TEMPERATURE, pin solder -- 10 sec TEMPERATURE, junction1 TEMPERATURE, storage OPERATING TEMPERATURE RANGE, case PA19 TEST CONDITIONS
2
ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS
80V 5A 78W 40V VS 300C 150C -65 to 155C -55 to 125C PA19A MAX MIN TYP MAX UNITS
SPECIFICATIONS
PARAMETER INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature OFFSET VOLTAGE, vs. supply OFFSET VOLTAGE, vs. power BIAS CURRENT, initial BIAS CURRENT, vs. supply OFFSET CURRENT, initial INPUT IMPEDANCE, DC INPUT CAPACITANCE COMMON MODE VOLTAGE RANGE3 COMMON MODE REJECTION, DC GAIN OPEN LOOP GAIN at 10Hz OPEN LOOP GAIN at 10Hz GAIN BANDWIDTH PRODUCT at 1MHz POWER BANDWIDTH, AV = 100 POWER BANDWIDTH, AV = 1 OUTPUT VOLTAGE SWING3 VOLTAGE SWING3 VOLTAGE SWING3 SETTLING TIME to .1% SETTLING TIME to .01% SLEW RATE, AV = 100 SLEW RATE, AV = 10 POWER SUPPLY VOLTAGE CURRENT, quiescent THERMAL RESISTANCE, AC, junction to case4 RESISTANCE, DC, junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case NOTES: * 1. 2. 3. 4. TC = 25C to +85C, F > 60Hz TC = 25C to +85C, F < 60Hz TC = 25C to +85C Meets full range specifications TC = 25C to +85C TC = 25C 15 TC = 25C, IO = 4A TC = 25C to +85C, IO = 2A TC = 25C to +85C, IO = 78mA TC = 25C, 2V step TC = 25C, 2V step TC = 25C, CC = 2.2pF TC = 25C, CC = 22pF VS-5 VS-3 VS-1 600 TC = 25C, RL = 1K TC = 25C, RL = 15 TC = 25C, CC = 2.2pF TC = 25C, CC = 2.2pF TC = 25C, CC = 330pF 74 TC = 25C TC = 25C to +85C TC = 25C TC = 25C to +85C TC = 25C TC = 25C TC = 25C TC = 25C TC = 25C TC = 25C to +85C TC = 25C to +85C, VCM = 20V MIN
TYP
.5 10 10 20 10 .01 5 1011 6 VS-15 VS-12 70 104
3 30 200 100 * *
.25 5 * * 5 * 3 * * * *
.5 10 50 25
mV V/C V/V V/W pA pA/V pA M pF V dB
111 78 100 3.5 250 VS-4 VS-2 VS-.5 .3 1.2 900 650 35 100 40 120
*
* * * * *
dB dB MHz MHz kHz
* * * 800
* * * * * * *
V V V s s V/s V/s
*
* *
* *
V mA C/W C/W C/W C
1.2 1.6 30 -25
1.3 1.8 +85 *
* * *
* * *
The specification of PA19A is identical to the specification for PA19 in applicable column to the left. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to achieve high MTTF. The power supply voltage for all specifications is the TYP rating unless noted as a test condition. +VS and -VS denote the positive and negative supply rail respectively. Total VS is measured from +VS to -VS. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 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
PA19 * PA19A
NORMALIZED QUIESCENT CURRENT, IQ (X)
INTERNAL POWER DISSIPATION, P(W)
80 70 60 50 40 30 20 10 0 0
POWER DERATING
3.5 3.0
CURRENT LIMIT, ILIM (A)
CURRENT LIMIT
R
CL
QUIESCENT CURRENT
1.6 1.4 1.2 1.0 .8 .6 40 50 70 30 60 80 TOTAL SUPPLY VOLTAGE, VS (V) 80
=0
2.5 2.0 1.5 1.0 .5
RCL = 1.2
RCL =
.27
25 50 75 100 125 150 CASE TEMPERATURE, TC (C)
0 -50 -25 0 25 50 75 100 125 CASE TEMPERATURE, TC (C)
VOLTAGE DROP FROM SUPPLY (V)
100
OPEN LOOP GAIN, AOL (dB)
SMALL SIGNAL RESPONSE
4V
OUTPUT VOLTAGE SWING
OUTPUT VOLTAGE, VO (VPP )
POWER RESPONSE
80 60 40 20 0 100 1K 10K 100K 1M 10M 100M FREQUENCY, F (Hz)
22
33 0p F
58 RL = 15 41
CC
CC
3V +V -V 2V
=2
2.
pF
2p
.2p
F
30 21 15 11 8
CC = 33 0pF
F
=2 2pF
1V 0 1 2 3 4 OUTPUT CURRENT, IO (A) 5
-20
| +VS | + | -VS | = 80V 100K 200K 600K1M 2M 4M 8M FREQUENCY, F (Hz) 20M
OUTPUT VOLTAGE, VO (V)
SLEW RATE, (V/s)
RL = 15 400
20 10 0
VIN = 2V AV = 10 t r = 10ns RL = 15
INPUT NOISE VOLTAGE, VN (nV/ Hz)
1000 800 600
SLEW RATE VS. COMP.
30
PULSE RESPONSE
30 20 15 10 7 5 3 10
INPUT NOISE
200
-10 -20 -30 -50 0
100 80
40
2 4 6 10 20 40 60 100 200 400 COMPENSATION CAPACITOR, CC (pF)
POWER SUPPLY REJECTION, PSR (dB)
50 100 150 200 250 300 TIME, t (ns)
1K 100 10K 100K FREQUENCY, F (Hz)
1M
COMMOM MODE REJECTION, CMR (dB)
120 100 80 60 40 20 1K 10M 100M 10K 100K 1M FREQUENCY, F (Hz)
100 80 60 40
COMMON MODE VOLTAGE, VCM (VP-P)
COMMON MODE REJECTION
POWER SUPPLY REJECTION
70 65 60 55 50 45 40
COMMON MODE VOLTAGE
20 0 1K
10K 100K 1M 10M 100M FREQUENCY, F (Hz)
10
100 1K 10K 100K 1M 10M FREQUENCY, F (Hz)
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
PA19 * PA19A
GENERAL
Please read the "General Operating Considerations" section, which covers stability, supplies, heatsinking, mounting, current limit, SOA interpretation, and specification interpretation. Additional information can be found in the application notes. For information on the package outline, heatsinks, and mounting hardware, consult the "Accessory and Package Mechanical Data" section of the handbook.
OPERATING CONSIDERATIONS
2. Safe short circuit combinations of voltage and current are limited to a power level of 100W. 3. The output stage is protected against transient flyback. However, for protection against sustained, high energy flyback, external fastrecovery diodes should be used.
SUPPLY CURRENT
The PA19 features a class A/B driver stage to charge and discharge gate capacitance of Q7 and Q19. As these currents approach 0.5A, the savings of quiescent current over that of a class A driver stage is considerable. However, supply current drawn by the PA19, even with no load, varies with slew rate of the output signal as shown below. 400 300 200 100 0 30K 100K 300K 1M 3M 10M FREQUENCY, F (Hz) SUPPLY CURRENT VOUT = 60VP-P SINE RL = 500
CURRENT LIMIT
Q2 (and Q25) limit output current by turning on and removing gate drive when voltage on pin 2 (pin 7) exceeds .65V differential from the positive (negative) supply rail. With internal resistors equal to 1.2, current limits are approximately 0.5A with no external current limit resistors. With the addition of external resistors current limit will be: ILIM = .65V +.54A RCL To determine values of external current limit resistors: .65V RCL = ICL - .54A
PHASE COMPENSATION
At low gain settings, an external compensation capacitor is required to insure stability. In addition to the resistive feedback network, roll off or integrating capacitors must also be considered when determining gain settings. The capacitance values listed in the external connection diagram, along with good high frequency layout practice, will insure stability. Interpolate values for intermediate gain settings.
OUTPUT LEADS
Keep the output leads as short as possible. In the video frequency range, even a few inches of wire have significant inductances, raising the interconnection impedance and limiting the output current slew rate. Furthermore, the skin effect increases the resistance of heavy wires at high frequencies. Multistrand Litz Wire is recommended to carry large video currents with low losses.
SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational amplifier has two distinct limitations: 1. The current handling capability of the MOSFET geometry and the wire bonds. 2. The junction temperature of the output MOSFETs.
OUTPUT CURRENT FROM VS OR -VS(A)
5.0 4.0 3.5 3.0 2.5 2.0 TC = 25C t= 10 0m t= s 30 0m s
THERMAL SHUTDOWN
The thermal protection circuit shuts off the amplifier when the substrate temperature exceeds approximately 150C. This allows the heatsink selection to be based on normal operating conditions while protecting the amplifier against excessive junction temperature during temporary fault conditions. Thermal protection is a fairly slow-acting circuit and therefore does not protect the amplifier against transient SOA violations (areas outside of the steady state boundary). It is designed to protect against short-term fault conditions that result in high power dissipation within the amplifier. If the conditions that cause thermal shutdown are not removed, the amplifier will oscillate in and out of shutdown. This will result in high peak power stresses, destroy signal integrity, and reduce the reliability of the device.
ST
EA
DY
ST
AT
1.5
E
50 60 70 80 15 20 25 30 35 40 INTERNAL VOLTAGE DROP SUPPLY TO OUTPUT VS-VO(V)
STABILITY
Due to its large bandwidth, the PA19 is more likely to oscillate than lower bandwidth power operational amplifiers. To prevent oscillations a reasonable phrase margin must be maintained by: 1. Selection of the proper phase compensation capacitor. Use the values given in the table under external connections and interpolate if necessary. The phase margin can be increased by using a larger capacitor at the expense of slew rate. Total physical length (pins of the PA19, capacitor leads plus printed circuit traces) should be limited to a maximum of 3.5 inches. 2. Keep the external sumpoint stray capacitance to ground at a minimum and the sumpoint load resistance (input and feedback resistors in parallel) below 500. Larger sumpoint load resistances can be used with increased phase compensation and/or by bypassing the feedback resistor. 3. Connect the case to any AC ground potential.
The SOA curves combine the effect of these limits and allow for internal thermal delays. For a given application, the direction and magnitude of the output current should be calculated or measured and checked against the SOA curves. This is simple for resistive loads but more complex for reactive and EMF generating loads. The following guidelines may save extensive analytical efforts: 1. Capacitive and inductive loads up to the following maximums are safe:
VS
40V 30V 20V 15V
CAPACITIVE LOAD .1F 500F 2500F
INDUCTIVE LOAD 11mH 24mH 75mH 100mH
This data sheet has been carefully CORPORATION * to be NORTH SHANNON ROAD * assumed for possible inaccuracies or omissions. All specifications HOTLINE: 1 (800) 546-2739 APEX MICROTECHNOLOGY checked and is believed 5980reliable, however, no responsibility isTUCSON, ARIZONA 85741 * USA * APPLICATIONS are subject to change without notice. PA19U REV. H FEBRUARY 1998 (c) 1998 Apex Microtechnology Corp.
SUPPLY CURRENT, IS (mA)

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