apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 1 features ? wide supply range 15v to 150v ? high output current 1.5a continuous (PB58) 2.0a continuous (PB58a) ? voltage and current gain ? high slew 50v/s minimum (PB58) 75v/s minimum (PB58a) ? programmable output current limit ? high power bandwidth 320 khz minimum ? 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 ampli?er designed to provide voltage and current gain for a small signal, general purpose op amp. including the power booster within the feed - back loop of the driver ampli?er results in a composite ampli?er 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, pro - viding 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 con?gurations, but can be accomplished with a single external capacitor. enormous ?exibility is provided through the choice of driver ampli?er, current limit, supply voltage, voltage gain, and compensation. this hybrid circuit utilizes a beryllia (beo) substrate, thick ?lm resistors, ceramic capacitors and semiconductor chips to maximize reliability, minimize size and give top performance. ultrasonically bonded aluminum wires provide reliable inter - connections 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. typical application figure 1. inverting composite ampli?er. equivalent schematic external connections ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ???????????????????????? ???????????? ? ? ? ? ? ? ? ? ?? ???? ??? ???? ?? ?? ?? ?? ?? ?? ?? ?? ??? ?? ??? ??? ?? ??? ??? ???? ??? ???? ? ? ? ? ? ? ? ? ???????? ?? ?? ? ?? ??? ?? ? ???? ? ? ???? ? ? ??? ? ?? ?? ??? ???? ? ? ? ? ? ?? ? ? ???? ???? ?? ??? ??? ??? ? ?? ??? ? ? ? ? ? ? 8-pin to-3 package style ce
apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 2 absolute maximum ratings specifications PB58 ? PB58a supply voltage, +v s to Cv s 300v output current, within soa 2.0a power dissipation, internal at t c = 25c 1 83w input voltage, referred to com 15v temperature, pin solder10 sec max 300c temperature, junction 1 175c temperature, storage C65 to +150c operating temperature range, case C55 to +125c specifications absolute maximum ratings PB58 PB58a parameter test conditions 2 min typ max min typ max units input offset voltage, initial .75 1.75 * 1.0 v offset voltage, vs. temperature full temperature range 3 C4.5 C7 * * mv/c input impedance, dc 25 50 * * k input capacitance 3 * pf closed loop gain range 3 10 25 * * * v/v gain accuracy, internal rg, rf a v = 3 10 15 * * % gain accuracy, external rf a v = 10 15 25 * * % phase shift f = 10khz, av cl = 10, c c = 22pf 10 * f = 200khz, av cl = 10, c c = 22pf 60 * output voltage swing io = 1.5a (PB58), 2a (PB58a) v s C11 v s C8 v s C15 v s C11 v voltage swing io = 1a v s C10 v s C7 * * v voltage swing io = .1a v s C8 v s C5 * * v current, continuous 1.5 2.0 a slew rate full temperature range 50 100 75 * v/s capacitive load full temperature range 2200 * pf settling time to .1% r l = 100, 2v step 2 * s power bandwidth v c = 100 vpp 160 320 240 * khz small signal bandwidth c c = 22pf, a v = 25, vcc = 100 100 * khz small signal bandwidth c c = 22pf, a v = 3, vcc = 30 1 * mhz power supply voltage, v s 4 full temperature range 15 6 60 150 * * * v current, quiescent v s = 15 11 * ma v s = 60 12 * ma v s = 150 14 18 * * ma thermal resistance, ac junction to case 5 full temp. range, f > 60hz 1.2 1.3 * * c/w resistance, dc junction to case full temp. range, f < 60hz 1.6 1.8 * * c/w resistance, junction to air full temperature range 30 * c/w temperature range, case meets full range speci?cations C25 25 85 * * * c notes: * the speci?cation of PB58a is identical to the speci? cation for PB58 in applicable column to the left. 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). 2. the power supply voltage speci? ed under typical (typ) applies, t c = 25c unless otherwise noted. 3. guaranteed by design but not tested. 4. +v s and Cv s denote the positive and negative supply rail respectively. 5. rating applies if the output current alternates between both output transistors at a rate faster than 60hz. 6. +v s /Cv s must be at least 15v above/below com. 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 850c to avoid generating toxic fumes. caution
apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 3 typical performance graphs PB58 ? PB58a ??? ? ?? ?? ?? ??? ? ?????????????? ???????????????????????????????? ??? ?? ??? ? ??? ? ????????????? ? ?? ???????????????????? ??? ??? ????????????????? ? ?? ????????????????????? ?????????????????????? ?? ?? ?? ?? ??? ??? ??? ?? ?? ????????????????????? ?? ?? ??? ??? ????????????????? ???? ???? ?? ??? ????????????????? ?? ??? ?????????????? ????????????????? ? ??? ??? ? ?? ??? ??? ? ???????????? ??? ?????????????? ??? ?? ??? ????????????????? ???? ?? ??????????????????? ??????????????????? ??? ??? ??? ?? ??????????????????? ? ????? ? ????????????????? ?? ??? ? ?? ???????????????????? ??????????????????????? ?? ???? ??? ??? ? ????????????????? ? ???? ? ?? ?? ???????????????????? ??????????????????????????? ? ???? ? ???? ?? ???? ?? ?? ???? ??????????????????? ? ??? ??? ??? ??? ? ?? ?? ??? ?? ????????????????????? ???? ? ??? ? ???? ?? ??? ???? ?? ??? ?? ???? ?? ????????????????? ???????????????????????? ???????????????? ??? ???? ? ?? ??? ? ?? ?? ?? ??? ? ?? ?? ???? ??? ??? ? ?? ??? ??????????????????? ? ????? ??????????????????? ? ????? ?????????????????????? ???? ???? ??? ??? ? ???????????????????????? ? ?? ?? ????? ?? ?? ???? ?? ?? ????? ?? ?? ????? ?? ?? ????? ?? ?? ???? ? ? ?? ? ? ?? ???????????????????? ? ????? ????????? ???????? ??????????????????? ? ????? ??? ?? ??? ? ?? ?? ??? ????????? ??? ?? ??????????????????? ? ????? ??? ? ?? ?? ??? ?????????????? ? ? ?????? ? ? ?????? ??? ?? ?? ??? ? ?? ??????? ? ?? ??????? ? ?? ??????? ? ? ??????? ? ? ??????? ?? ?? ? ? ? ? ? ? ? ??? ??? ??? ? ?? ?? ?? ?? ????????????????? ? ???? ? ? ?????? ? ? ?????? ????? ?????
apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 4 stability stability can be maximized by observing the following guidelines: 1. operate the booster in the lowest practical gain. 2. operate the driver ampli?er 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 con?gurations. 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 dif?cult to achieve in a con?guration 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. driver c ch c f c c fpbw sr op07 - 22p 22p 4khz 1.5 741 - 18p 10p 20khz 7 lf155 - 4.7p 10p 60khz >60 lf156 - 4.7p 10p 80khz >60 tl070 22p 15p 10p 80khz >60 for: r f = 33k, r i = 3.3k, r g = 22k table 1: typical values for case where op amp effective gain = 1. figure 2. non-inverting composite ampli?er. slew rate the slew rate of the composite ampli?er 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. general please read application note 1 "general operating con - siderations" which covers stability, supplies, heat sinking, mounting, current limit, soa interpretation, and speci?cation interpretation. visit www.apexmicrotech.com for design tools that help automate tasks such as calculations for stability, internal power dissipation, current limit; heat sink selection; apexs complete application notes library; technical seminar workbook; and evaluation kits. current limit for proper operation, the current limit resistor (r cl ) 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: +i l = .65/r cl + .010, -i l = .65/r cl . safe operating area note: the output stage is protected against transient ?yback. however, for protection against sustained, high energy ?yback, external fast-recovery diodes should be used. composite amplifier considerations cascading two ampli?ers within a feedback loop has many advantages, but also requires careful consideration of several ampli?er and system parameters. the most important of these are gain, stability, slew rate, and output swing of the driver. operating the booster ampli?er in higher gains results in a higher slew rate and lower output swing requirement for the driver, but makes stability more dif?cult to achieve. gain set r g = [ (av-1) ? 3.1k] C 6.2k r g + 6.2k av = +1 3.1k the boosters closed-loop gain is given by the equation above. the composite ampli?ers closed loop gain is determined by the feedback network, that is: Crf/ri (inverting) or 1+rf/ri (non-inverting). the driver ampli?ers effective gain is equal to the composite gain divided by the booster gain. example: inverting con?guration (?gure 1) with r i = 2k, r f = 60k, r g = 0 : av (booster) = (6.2k/3.1k) + 1 = 3 av (composite) = 60k/2k = C 30 av (driver) = C 30/3 = C10 operating considerations PB58 ? PB58a ????????? ?????????????? ? ??????? ?????????????? ? ??????? ?????????????? ? ???????? ? ? ? ?? ?? ?? ?? ?? ?? ?? ?? ?? ??? ??? ??? ?????????????????????? ? ?????? ? ???? ???????????????????????????????????????? ? ??? ? ???? ?? ??? ?? ??? ???? ? ? ? ? ? ? ???? ???? ?? ??? ??? ??? ? ?? ??? ? ? ? ? ? ? ? ?? ???? ???? ? ?? this data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. all speci?cations are subject to change without notice. PB58u rev i october 2004 ? 2004 apex microtechnology corp.
|
