PB51A

PB51 • PB51A Power Booster Amplifier RoHS COMPLIANT FEATURES • • • • • • • • Wide Supply Range – ±15V to ±150V High Output Current – 1.5A Continuous (PB51), 2.0A Continuous (PB51A) Voltage and Current Gain High Slew – 50V/µs Minimum (PB51) 75V/µs Minimum (PB51A) Programmable Output Current Limit High Power Bandwidth – 320 kHz Minimum Low Quiescent Current – 12mA Typical Evaluation Kit – EK29 APPLICATIONS • • • High Voltage Instrumentation Electrostatic Transducers & Deflection Programmable Power Supplies up to 280V P-P DESCRIPTION The PB51 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 PB51 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 12-pin Power SIP is electrically isolated. www.apexanalog.com © Apex Microtechnology Inc. All rights reserved Jan 2020 PB51U Rev M PB51 • PB51A TYPICAL CONNECTION Figure 1: Typical Connection 2 PB51U Rev M PB51 • PB51A PINOUT AND DESCRIPTION TABLE Figure 2: External Connections Pin Number Name Description 1 2 IN GND 5 CC 6 GAIN 8 +Vs 9 CL The output. Connect this pin to load and to the feedback resistors. Ground. Connect to same ground as referenced by input amplifier. Compensation capacitor connection. Select value based on Phase Compensation. See applicable section. 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. The positive supply rail. 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. 11 12 3, 4, 7, 10 -Vs OUT NC PB51U Rev M The negative supply rail. The output. Connect this pin to load and to the feedback resistors. No connection. 3 PB51 • PB51A SPECIFICATIONS The power supply voltage specified under typical (TYP) applies, TC = 25°C unless otherwise noted. ABSOLUTE MAXIMUM RATINGS Parameter Symbol Max Units +Vs to -Vs 300 V IO 2 A Power Dissipation, internal @ Tc = 25°C PD 83 W Input Voltage, referred to COM VIN 15 V 260 °C 175 °C -55 +125 °C -40 +85 °C Supply Voltage, total Output Current, within SOA 1 Min -15 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 PB51A is constructed from MOSFET devices. ESD handling procedures must be observed. The substrate contains beryllia (BeO). Do not crush, machine or subject to temperatures in excess of 850°C to avoid generating toxic fumes. INPUT Parameter Test Conditions PB51 Min Offset Voltage, initial Offset Voltage vs. Temperature Full temp range1 Input Impedance, DC Input Capacitance Closed Loop Gain Range 25 3 PB51A 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 PB51U Rev M PB51 • PB51A OUTPUT Parameter Test Conditions PB51 Min Typ Voltage Swing IO = 1.5A (PB58), ±VS–11 ±VS–8 2A (PB58A) IO = 1A ±VS–10 ±VS–7 Voltage Swing IO = 0.1A Voltage Swing Current, continuous Slew Rate Capacitive Load ±VS–8 1.5 50 PB51A Max Min Typ Max ±VS–15 ±VS–11 ±VS–5 V * * V * * V * * A V/µs pF * µs * kHz 2.0 75 100 2200 Units Settling Time to 0.1% Full temp range Full temp range RL = 100, 2V step Power Bandwidth VC = 100 VP-P Small Signal Bandwidth CC=22pF, AV=25, VCC = ±100 100 * kHz Small Signal Bandwidth CC =22pF, AV=3, VCC = ±30 1 * MHz PB51 PB51A 2 160 230 240 POWER SUPPLY Test Conditions Min Typ Max Min Typ Max Voltage, ±VS 1 Full temp range ±152 ±60 ±150 * * * V Current, quiescent VS = ±15 VS = ±60 VS = ±150 * mA mA mA Parameter 11 12 14 18 * * * Units 1. +VS and –VS denote the positive and negative supply rail respectively. 2. +VS/–VS must be at least 15V above/below COM. PB51U Rev M 5 PB51 • PB51A 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 temperature range Meets full range specs PB51 Min PB51A 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 PB51A is identical to the specification for PB51 in applicable column to the left. 6 PB51U Rev M PB51 • PB51A TYPICAL PERFORMANCE GRAPHS Figure 3: Power Derating Figure 4: Current Limit 2 80 1.5 Current Limit, ILIM (A) 60 40 RC с L Ϭ͘ϰ ϳɏ RC сϬ L ͘ϲϴ 1 ɏ RCLсϭ͘ϱɏ 0.5 20 0 –25 0 25 50 75 100 0 –25 125 0 50 75 125 100 Case Temperature, TC (°C) Case Temperature, TC (°C) Figure 5: Output Voltage Swing Figure 6: Small Signal Response 14 12 Open Loop Gain, A (dB) Voltage Drop From Suppply, VS- VO (V) 25 10 VO 8 VO + 6 80 0 60 –45 40 –90 Phase 20 KƉĞŶ>ŽŽƉWŚĂƐĞ͕Ɍ;ΣͿ /ŶƚĞƌŶĂůWŽǁĞƌŝƐƐŝƉĂƟŽŶ͕W;tͿ 100 –135 Gain 4 .01 .05 1 1.5 Output Current, IO (A) PB51U Rev M 2 0 100 1k 10k 100k 1M –180 10M Frequency, F (Hz) 7 PB51 • PB51A Figure 7: Small Signal Response Figure 8: Small Signal Response 0 30 AVCL = 3 Closed Loop Gain, ɭ (°) Closed Loop Gain, A (dB) AVCL = 25 20 AVCL = 10 10 AVCL = 3 0 –45 AVCL = 25 –90 –135 CC = 22pF CC = 22pF –10 1k AVCL = 10 10k 100k 1M –180 1k 10M 10k Figure 9: Quiescent Current 0.5 15 /ŶƉƵƚKīƐĞƚsŽůƚĂŐĞ͕sOS;sͿ Quiescent Current, IQ (mA) 10M Figure 10: Input Offset Voltage 20 50V ±Vs = ±1 00V ±Vs = ±1 10 0V ±Vs = ±3 5 0 25 50 75 100 Case Temperature, TC (°C) 8 1M Frequency, F (Hz) Frequency, F (Hz) 0 –25 100k 125 0 -0.5 -1 -1.5 –25 0 25 50 75 100 125 Case Temperature, TC (°C) PB51U Rev M PB51 • PB51A Figure 11: Slew Rate vs. Temperature Figure 12: Power Response 300 400 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 10M 3M Frequency, F (Hz) Case Temperature, TC (°C) Figure 13: Pulse Response Figure 14: Harmonic Distortion 0.1 60 -20 -40 > Ŭɏ сϭ .01 > 0 R 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) PB51U Rev M 6 7 8 .001 300 1k 3k 10k 30k Frequency, F (Hz) 9 PB51 • PB51A 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 .3 Ϭŵ ĂĚ ĂĚ ƚĂ .5 .4 ƐƚĞ ϭϬ ƚĞ d C =8 5° C =2 5° C .2 .1 10 20 30 40 50 100 200 300 ^ƵƉƉůLJƚŽKƵƚƉƵƚŝīĞƌĞŶƟĂů͕sSͲsO;sͿ 10 PB51U Rev M PB51 • PB51A 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 0.33 with a maximum practical value of 47. 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. PB51U Rev M 11 PB51 • PB51A GAIN SET The booster’s closed-loop gain is given by the equation below. 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” (Av) is equal to the composite gain divided by the booster gain. R G =   Av – 1   3.1k  – 6.2k R G + 6.2k Av = -----------------------+1 3.1k Example: Inverting configuration (figure 17) with Ri = 2 k, Rf = 60 k, Rg = 0: Av (booster) = (6.2 k/3.1 k) + 1 = 3 Av (composite) = 60 k/2 k = – 30 Av (driver) = – 30/3 = –10 Figure 17: Composite Amplifier Example 12 PB51U Rev M PB51 • PB51A STABILITY Stability can be maximized by observing the following guidelines: 1. Operate the booster in the lowest practical gain. 2. Operate the driver amplifier in the highest practical effective gain. 3. Keep gain-bandwidth product of the driver lower than the closed loop bandwidth of the booster. 4. 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, Table 1 gives compensation values for optimum square wave response with the op amp drivers listed. Table 1: Example Drivers DRIVER CCH CF CC FPBW SR OP07 741 LF155 LF156 TL070 22p 22p 18p 4.7p 4.7p 15p 22p 10p 10p 10p 10p 4kHz 20kHz 60kHz 80kHz 80kHz 1.5 7 >60 >60 >60 For: RF = 33K, RI = 3.3K, RG = 22K TYPICAL VALUES FOR CASE WHERE OP AMP EFFECTIVE GAIN = 1. 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. PB51U Rev M 13 PB51 • PB51A PACKAGE OPTIONS Part Number Apex Package Style Description PB51 PB51A PB51EE PB51EEA DP DP EE EE 12-pin SIP 12-pin SIP 12-pin SIP w/ formed leads 12-pin SIP w/ formed leads PACKAGE STYLE DP 14 PB51U Rev M PB51 • PB51A PACKAGE STYLE EE PB51U Rev M 15 PB51 • PB51A 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. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (expressed or implied). Apex Microtechnology reserves the right to make changes without further notice to any specifications or products mentioned herein to improve reliability. This document is the property of Apex Microtechnology and by furnishing this information, Apex Microtechnology grants no license, expressed or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. 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