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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 amplifier 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 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, 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
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 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 amplifier.
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 V
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 solder--10 sec max
300C
TEMPERATURE, junction
1
175C
TEMPERATURE, storage
65 to +150C
OPERATING TEMPERATURE RANGE, case
55 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
4.5
7
*
*
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
11
V
S
8
V
S
15 V
S
11
V
VOLTAGE SWING
Io = 1A
V
S
10
V
S
7
*
*
V
VOLTAGE SWING
Io = .1A
V
S
8
V
S
5
*
*
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 specifications
25
25
85
*
*
*
C
NOTES: * The specification of PB58A is identical to the specification 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 specified under typical (TYP) applies, T
C
= 25C unless otherwise noted.
3. Guaranteed by design but not tested.
4. +V
S
and V
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
/V
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 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 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.
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 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.
GENERAL
Please read Application Note 1 "General Operating Con-
siderations" 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.
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 flyback.
However, for protection against sustained, high energy
flyback, external fast-recovery diodes should be used.
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
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 = 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
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 specifications are subject to change without notice.
PB58U REV I OCTOBER 2004 2004 Apex Microtechnology Corp.
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