PB58A

PB58 • PB58A Power Booster Amplifier RoHS COMPLIANT FEATURES • • • • • • • • Wide Supply Range — ±15V to ±150V High Output Current — 1.5A Continuous (PB58) 2.0A Continuous (PB58A) Voltage and Current Gain High Slew Rate — 100V/µs typical (PB58) 75V/µs minimum (PB58A) Programmable Output Current Limit High Power Bandwidth — 320 kHz typical Low Quiescent Current — 12mA typical Evaluation Kit — See EK50 APPLICATIONS • • • High Voltage Instrumentation Electrostatic Transducers & Deflection Programmable Power Supplies up to 280V p-p DESCRIPTION The PB58 is a high voltage, high current amplifier designed to provide voltage and current gain for a small signal, general purpose op amp. Including the power booster within the feedback loop of the driver amplifier results in a composite amplifier with the accuracy of the driver and the extended output voltage range and current capability of the booster. The PB58 can also be used without a driver in some applications, requiring only an external current limit resistor to function properly. The output stage utilizes complementary MOSFETs, providing symmetrical output impedance and eliminating second breakdown limitations imposed by Bipolar Transistors. Internal feedback and gainset resistors are provided for a pin-strapable gain of 3. Additional gain can be achieved with a single external resistor. Compensation is not required for most driver/gain configurations, but can be accomplished with a single external capacitor. Enormous flexibility is provided through the choice of driver amplifier, current limit, supply voltage, voltage gain, and compensation. This hybrid circuit utilizes a beryllia (BeO) substrate, thick film resistors, ceramic capacitors and 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 electrically isolated and hermetically sealed using one-shot resistance welding. The use of compressible isolation washers voids the warranty. www.apexanalog.com © Apex Microtechnology Inc. All rights reserved Aug 2021 PB58U Rev R PB58 • PB58A TYPICAL CONNECTION Figure 1: Typical Connection 2 PB58U Rev R PB58 • PB58A PINOUT AND DESCRIPTION TABLE Figure 2: External Connections Pin Number Name Description 1 OUT 2 CL The output. Connect this pin to load and to the feedback resistors. Connect to the current limit resistor. Output current flows into/out of these pins through RCL. The output pin and the load are connected to the other side of RCL. 3 4 5 6 +Vs IN GND -Vs 7 GAIN 8 CC PB58U Rev R The positive supply rail. The input. Ground. Connect to same ground as referenced by input amplifier. The negative supply rail. Gain resistor pin. Connect RGAIN between GAIN and OUT. This will specify the gain for the power booster itself, not the composite amplifier. See applicable section. Compensation capacitor connection. Select value based on Phase Compensation. See applicable section. 3 PB58 • PB58A SPECIFICATIONS The power supply voltage specified under typical (TYP) applies, TC = 25°C unless otherwise noted. ABSOLUTE MAXIMUM RATINGS Parameter Symbol Supply Voltage, total Output Current, within SOA Power Dissipation, continuous @ Tc = 25°C 1 Input Voltage, referred to COM Min Max Units +Vs to -Vs 300 V IO 2 A PD 83 W VIN ±15 V 350 °C 175 °C -65 +150 °C -55 +125 °C Temperature, pin solder, 10s max. Temperature, junction Temperature Range, storage TJ Operating Temperature Range, case TC 1 1. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to achieve high MTTF (Mean Time to Failure). CAUTION The PB58 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 850°C to avoid generating toxic fumes. INPUT Parameter Test Conditions PB58 Min Offset Voltage, initial Offset Voltage vs. Temperature Full temp range1 Input Impedance, DC Input Capacitance Closed Loop Gain Range 25 3 PB58A Typ Max ±0.75 -4.5 Units Typ Max ±1.75 * ±1.0 V -7 * * mV/°C * * * * kΩ pF V/V 50 3 10 25 Min * * Gain Accuracy, internal Rg, Rf AV = 3 ±10 ±15 * * % Gain Accuracy, external Rf AV = 10 ±15 ±25 * * % f = 10 kHz, AVCL = 10, CC = 22pF 10 * ° f = 200 kHz, AVCL = 10, CC = 22pF 60 * ° Phase Shift 1. Guaranteed by design but not tested. 4 PB58U Rev R PB58 • PB58A OUTPUT Parameter Test Conditions PB58 Min Voltage Swing Io = 1.5A (PB58), VS–11 2A (PB58A) VS–10 Io = 1A Voltage Swing Io = 0.1A Voltage Swing Current, continuous Slew Rate Capacitive Load Settling Time to 0.1% Power Bandwidth Small Signal Bandwidth Small Signal Bandwidth Full temp range Full temp range RL = 100 Ω, 2V step VC = 100 Vpp VS–8 1.5 50 Typ PB58A Max Typ VS –8 VS–15 VS–11 V VS –7 * * V VS –5 * * V * * A V/µs pF * µs * kHz 100 * kHz 1 * MHz PB58 PB58A 2 75 100 2200 2 160 CC=22pF, AV=25, Vcc = ±100 CC =22pF, AV=3, Vcc = ±30 320 240 Max Units Min POWER SUPPLY Parameter Voltage, ±VS1 Current, quiescent Test Conditions Min Typ Max Min Typ Max Full temp range ±152 ±60 ±150 * * * Units V VS = ±15 11 * mA VS = ±60 12 * mA VS = ±150 14 18 * * mA 1. +VS and –VS denote the positive and negative supply rail respectively. 2. +VS/–VS must be at least 15V above/below COM. PB58U Rev R 5 PB58 • PB58A THERMAL Parameter Resistance, AC, junction to case 1 Resistance, DC, junction to case Resistance, junction to air Temperature Range, case Test Conditions Full temp range, f > 60 Hz Full temp range, f < 60 Hz Full temp range Meets full range specs PB58 Min PB58A Typ Max 1.2 1.6 Min Max 1.3 * * °C/W 1.8 * * °C/W 30 -25 25 Units Typ * 85 * * °C/W * °C 1. Rating applies if the output current alternates between both output transistors at a rate faster than 60 Hz. Note: * The specification of PB58A is identical to the specification for PB58 in applicable column to the left. 6 PB58U Rev R PB58 • PB58A TYPICAL PERFORMANCE GRAPHS Figure 3: Power Derating Figure 4: Current Limit 2 80 Current Limit, ILIM (A) 60 40 20 0 –25 0 25 50 75 100 1.5 RC с L Ϭ͘ϰ ϳɏ 1 RC сϬ L ͘ϲϴ ɏ RCLсϭ͘ϱɏ 0.5 0 –25 125 0 Case Temperature, TC (°C) Closed Loop Gain, A (dB) Voltage Drop From Supply, VS-VO (V) 12 10 VO 8 VO + 6 1 1.5 Output Current, IO (A) PB58U Rev R 75 100 125 Figure 6: Small Signal Response 14 .05 50 Case Temperature, TC (°C) Figure 5: Output Voltage Swing 4 .01 25 2 80 0 60 –45 40 –90 Phase Gain 20 0 100 –135 1k 10k 100k 1M Closed Loop Phase, ɭ (°) /ŶƚĞƌŶĂůWŽǁĞƌŝƐƐŝƉĂƟŽŶ͕W;tͿ 100 –180 10M Frequency, F (Hz) 7 PB58 • PB58A Figure 7: Small Signal Response Figure 8: Small Signal Response 30 0 AVCL = 3 Closed Loop Phase, ɭ (°) Closed Loop Gain, A (dB) AVCL = 25 20 AVCL = 10 10 AVCL = 3 0 –45 AVCL = 25 –90 –135 CC = 22pF –10 1k AVCL = 10 CC = 22pF 10k 100k 1M –180 1k 10M 10k Frequency, F (Hz) 0.5 15 /ŶƉƵƚKīƐĞƚsŽůƚĂŐĞ͕sOS;sͿ Quiescent Current, IQ (mA) 10M Figure 10: Input Offset Voltage 20 V Vs = 150 V Vs = 100 10 Vs = 30V 5 0 25 50 75 100 Case Temperature, TC (°C) 8 1M Frequency, F (Hz) Figure 9: Quiescent Current 0 –25 100k 125 0 -0.5 -1 -1.5 –25 0 25 50 75 100 125 Case Temperature, TC (°C) PB58U Rev R PB58 • PB58A Figure 11: Slew Rate vs. Temperature Figure 12: Power Response 400 300 Output Voltage, VQ (VP-P) 300 +S LE W 200 -SLEW 100 0 –25 0 25 50 75 100 100 50 40 30 20 10 100k 125 300k Case Temperature, TC (°C) 10M 3M Frequency, F (Hz) Figure 13: Pulse Response Figure 14: Harmonic Distortion 0.1 60 -20 -40 Ŭɏ сϭ .01 > R 0 > 20 .03 R ŝƐƚŽƌƟŽŶ͕d,;%) 40 Z/sZсd>ϬϳϬ VS = 60V VO = 95VP-P сϯ 80 Output Voltage, VQ (V) 1M ϱɏ Slew Rate, SR (V/μs) 200 .003 -60 -80 1 2 3 4 5 Time, t (μs) PB58U Rev R 6 7 8 .001 300 1k 3k 10k 30k Frequency, F (Hz) 9 PB58 • PB58A SAFE OPERATING AREA (SOA) Note: The output stage is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast-recovery diodes should be used. Figure 15: SOA KƵƚƉƵƚƵƌƌĞŶƚ&ƌŽŵнsSŽƌͲsS;Ϳ 3 2 ƚс 1 ƐƚĞ ƐƚĞ ĂĚ LJƐ ƚĞ d C LJƐ ƚĂ =1 Ɛ LJƐ ƚĂ ƚĞ d C 25 °C 0.3 Ϭŵ ĂĚ ĂĚ ƚĂ 0.5 0.4 ƐƚĞ ϭϬ ƚĞ d C =8 5° C =2 5° C 0.2 0.1 10 20 30 40 50 100 200 300 ^ƵƉƉůLJƚŽKƵƚƉƵƚŝīĞƌĞŶƟĂů͕sSͲsO;sͿ 10 PB58U Rev R PB58 • PB58A 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.apexanalog.com for Apex Microtechnology’s complete Application Notes library, Technical Seminar Workbook, and Evaluation Kits. TYPICAL APPLICATION Figure 16: Typical Application CURRENT LIMIT For proper operation, the current limit resistor (RCL) must be connected as shown in the external connection diagram. The minimum value is 0.33Ω with a maximum practical value of 47Ω. For optimum reliability the resistor value should be set as high as possible. The value is calculated as follows: 0.65V I CL = -------------- + 0.01A R CL 0.65V – I CL = -------------R CL COMPOSITE AMPLIFIER CONSIDERATIONS Cascading two amplifiers within a feedback loop has many advantages, but also requires careful consideration of several amplifier and system parameters. The most important of these are gain, stability, slew rate, and output swing of the driver. Operating the booster amplifier in higher gains results in a higher slew rate and lower output swing requirement for the driver, but makes stability more difficult to achieve. PB58U Rev R 11 PB58 • PB58A GAIN SET R G =   Av – 1   3.1k  – 6.2k    R G + 6.2k Av = ------------------------ + 1 3.1k The booster’s closed-loop gain is given by the equation above. The composite amplifier’s closed loop gain is determined by the feedback network, that is: –Rf/Ri (inverting) or 1+Rf/Ri (non-inverting). The driver amplifier’s “effective gain” is equal to the composite gain divided by the booster gain. Example: Inverting configuration (figure 1) with R i = 2 k, R f = 60 k, R g = 0: Av (booster) = (6.2 k/3.1 k) + 1 = 3 Av (composite) = 60 k/2 k = – 30 Av (driver) = – 30/3 = –10 STABILITY 1. 2. 3. 4. Stability can be maximized by observing the following guidelines: Operate the booster in the lowest practical gain. Operate the driver amplifier in the highest practical effective gain. Keep gain-bandwidth product of the driver lower than the closed loop bandwidth of the booster. Minimize phase shift within the loop. A good compromise for (1) and (2) is to set booster gain from 3 to 10 with total (composite) gain at least a factor of 3 times booster gain. Guideline (3) implies compensating the driver as required in low composite gain configurations. Phase shift within the loop (4) is minimized through use of booster and loop compensation capacitors Cc and Cf when required. Typical values are 5pF to 33pF. Stability is the most difficult to achieve in a configuration where driver effective gain is unity (ie; total gain = booster gain). For this situation, The table below gives compensation values for optimum square wave response with the op amp drivers listed. Driver CCH CF CC FPBW SR 0P07 - 22p 22p 4 kHz 1.5 741 - 18p 10p 20 kHz 7 LF155 - 4.7p 10p 60 kHz >60 LF156 - 4.7p 10p 80 kHz >60 TL070 22p 15p 10p 80 kHz >60 For: RF = 33 k, RI = 3.3 k, RG = 22 k 12 PB58U Rev R PB58 • PB58A Figure 17: Non-Inverting Composite Amplifier SLEW RATE The slew rate of the composite amplifier is equal to the slew rate of the driver times the booster gain, with a maximum value equal to the booster slew rate. OUTPUT SWING The maximum output voltage swing required from the driver op amp is equal to the maximum output swing from the booster divided by the booster gain. The Vos of the booster must also be supplied by the driver, and should be subtracted from the available swing range of the driver. Note also that effects of Vos drift and booster gain accuracy should be considered when calculating maximum available driver swing. PB58U Rev R 13 PB58 • PB58A PACKAGE OPTIONS Part Number Apex Package Style Description PB58 PB58A CE CE 8-pin TO-3 8-pin TO-3 PACKAGE STYLE CE NEED TECHNICAL HELP? CONTACT APEX SUPPORT! For all Apex Microtechnology product questions and inquiries, call toll free 800-546-2739 in North America. For inquiries via email, please contact apex.support@apexanalog.com. International customers can also request support by contacting their local Apex Microtechnology Sales Representative. To find the one nearest to you, go to www.apexanalog.com IMPORTANT NOTICE Apex Microtechnology, Inc. has made every effort to insure the accuracy of the content contained in this document. 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