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M I C R O T E C H N O L O G Y
FEATURES
• WIDE SUPPLY RANGE — ±30V to ±100V
• HIGH OUTPUT CURRENT — Up to 2A Continuous
• VOLTAGE AND CURRENT GAIN
• HIGH SLEW RATE — 50V/µs Minimum
• PROGRAMMABLE OUTPUT CURRENT LIMIT
• HIGH POWER BANDWIDTH — 160 kHz Minimum
• LOW QUIESCENT CURRENT — 12mA Typical
8-pin TO-3
PACKAGE STYLE CE
EQUIVALENT SCHEMATIC
APPLICATIONS
7T
• HIGH VOLTAGE INSTRUMENTATION
• Electrostatic TRANSDUCERS & DEFLECTION
• Programmable Power Supplies Up to 180V p-p
2
DESCRIPTION
The PB50 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 PB50 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 secondary
breakdown limitations imposed by Bipolar Junction Transistors. Internal feedback and gainset resistors are provided for
a pin-strappable 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. Although the booster can
be configured quite simply, 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.
TYPICAL APPLICATION
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]
PB50
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS to –VS
OUTPUT CURRENT, within SOA
POWER DISSIPATION, internal at TC = 25°C1
INPUT VOLTAGE, referred to common
TEMPERATURE, pin solder—10 sec max
TEMPERATURE, junction1
TEMPERATURE, storage
OPERATING TEMPERATURE RANGE, case
200V
2A
35W
±15V
300°C
150°C
–65 to +150°C
–55 to +125°C
SPECIFICATIONS
PARAMETER
TEST CONDITIONS2
MIN
TYP
MAX
INPUT
OFFSET VOLTAGE, initial
±.75
±1.75
OFFSET VOLTAGE, vs. temperature
Full temperature range
–4.5
–7
INPUT IMPEDANCE, DC
25
50
INPUT CAPACITANCE
3
CLOSED LOOP GAIN RANGE
3
10
25
±10
±15
GAIN ACCURACY, internal Rg, Rf
AV = 3
GAIN ACCURACY, external Rf
AV = 10
±15
±25
PHASE SHIFT
F = 10kHz, AVCL = 10, CC = 22pF
10
60
F = 200kHz, AVCL = 10, CC = 22pF
OUTPUT
VOLTAGE SWING
Io = 2A
VS–11
VS –9
VOLTAGE SWING
Io = 1A
VS–10
VS –7
VS –5
VOLTAGE SWING
Io = .1A
VS–8
CURRENT, continuous
2
SLEW RATE
Full temperature range
50
100
CAPACITIVE LOAD
Full temperature range
2200
SETTLING TIME to .1%
RL = 100Ω, 2V step
2
160
320
POWER BANDWIDTH
VC = 100Vpp
SMALL SIGNAL BANDWIDTH
CC = 22pF, AV = 25, Vcc = ±100
100
1
SMALL SIGNAL BANDWIDTH
CC = 22pF, AV = 3, Vcc = ±30
POWER SUPPLY
VOLTAGE, ±VS3
CURRENT, quiescent
Full temperature range
±305
VS = ±30
VS = ±60
VS = ±100
±60
9
12
17
THERMAL
RESISTANCE, AC junction to case4
RESISTANCE, DC junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
Full temp. range, F > 60Hz
Full temp. range, F < 60Hz
Full temperature range
Meets full range specifications
–25
1.8
2.0
3.2
3.5
30
25
85
±100
12
18
25
UNITS
V
mV/°C
kΩ
pF
V/V
%
%
°
°
V
V
V
A
V/µs
pF
µs
kHz
kHz
MHz
V
mA
mA
mA
°C/W
°C/W
°C/W
°C
NOTES: 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 specified under typical (TYP) applies, TC = 25°C unless otherwise noted.
3. +VS and –VS denote the positive and negative supply rail respectively.
4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz.
5. +VS must be at least 15V above COM, –VS must be at least 30V below COM.
CAUTION
The PB50 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.
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]
PB50
OPERATING
CONSIDERATIONS
GENERAL
STABILITY
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 such as calculations for stability,
internal power dissipation, current limit; heat sink selection;
Apex’s complete Application Notes library; Technical Seminar
Workbook; and Evaluation Kits.
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.
CURRENT LIMIT
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For proper operation, the current limit resistor (RCL) must be
connected as shown in the external connection diagram. The
minimum value is 0.27Ω 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: +IL=
.65/RCL + .010, –IL = .65/RCL.
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DRIVER
CCH
CF
CC
OP07
-
22p
22p
741
-
18p
10p
LF155
-
4.7p
10p
LF156
-
4.7p
10p
TL070
22p
15p
10p
For: RF = 33K, RI = 3.3K, RG = 22K
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.
GAIN SET
RG = [ (Av-1) • 3.1K] – 6.2K
RG + 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 = 2K, R f = 60K, R g = 0 :
Av (booster) = (6.2K/3.1K) + 1 = 3
Av (composite) = 60K/2K = - 30
Av (driver) = - 30/3 = -10
SR
1.5
7
>60
>60
>60
Table 1:
Typical values for case where op amp effective gain = 1.
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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.
FPBW
4kHz
20kHz
60kHz
80kHz
80kHz
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Figure 2. 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.
This data
sheet has been carefully CORPORATION
checked and is believed
to be NORTH
reliable, however,
no responsibility
is assumed for
possible inaccuracies
omissions.
All specifications HOTLINE:
are subject to1change
without
notice.
APEX
MICROTECHNOLOGY
• 5980
SHANNON
ROAD • TUCSON,
ARIZONA
85741 •orUSA
• APPLICATIONS
(800)
546-2739
PB50U REV I OCTOBER 2006 © 2006 Apex Microtechnology Corp.