APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
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, provid-
ing 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 maxi-
mize 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.
OP
AMP
PB58
C
F
R
F
V
IN
R
I
+15V
15V
IN
COM
+Vs
Vs
R
CL
OUT
C
C
R
G
R
L
1
2
3
4
5
6
7
8
TOP VIEW
CL
+Vs
IN
COM
Vs
GAIN
R
G
COMP
C
C
OUT
R
CL
EQUIVALENT SCHEMATIC
EXTERNAL CONNECTIONS
3
1
2
6
8
5
4
7
IN
GAIN
COM
COMP
Q1
Q4
Q2
Q3
Q5
Q6
Q7
Q8
Q10
Q9
+Vs
OUT
CL
Vs
Q11
6.2K
50K
3.1K
H T T P : / / W W W . A P E X M I C R O T E C H . C O M ( 8 0 0 ) 5 4 6 - A P E X ( 8 0 0 ) 5 4 6 - 2 7 3 9
M I C R O T E C H N O L O G Y
POWER BOOSTER AMPLIFIERS
PB58 PB58A
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
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
= 25
C
1
83W
INPUT VOLTAGE, referred to COM
15V
TEMPERATURE, pin solder--10 sec max
300
C
TEMPERATURE, junction
1
175
C
TEMPERATURE, storage
65 to +150
C
OPERATING TEMPERATURE RANGE, case
55 to +125
C
SPECIFICATIONS
PB58
ABSOLUTE MAXIMUM RATINGS
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
= 25
C 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.
PB58A
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.
CAUTION
APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
TYPICAL PERFORMANCE
GRAPHS
PB58 PB58A
25
0
25
50
75
100
0
POWER DERATING
INTERNAL POWER DISSIPATION, P(W)
25
25
125
0
1.5
2
CURRENT LIMIT
1
.5
SLEW RATE, SR (V/ s)
100
10M
FREQUENCY, F (Hz)
0
60
SMALL SIGNAL RESPONSE
OPEN LOOP GAIN, A (dB)
20
40
80
1K
10K
10M
10
20
30
SMALL SIGNAL RESPONSE
10
1K
10K
10M
FREQUENCY, F (Hz)
180
100K
1M
10M
FREQUENCY, F (Hz)
10
300
POWER RESPONSE
OUTPUT VOLTAGE, V (V )
20
100
200
1
TIME, t (
s)
-80
PULSE RESPONSE
300
3K
30K
FREQUENCY, F (Hz)
.001
.1
HARMONIC DISTORTION
DISTORTION, THD (%)
.01
.03
25
75
CASE TEMPERATURE, T (
C)
0
QUIESCENT CURRENT
20
100
0
25
INPUT OFFSET VOLTAGE
INPUT OFFSET VOLTAGE, V (V)
.01
.05
2
OUTPUT CURRENT, I (A)
4
12
14
OUTPUT VOLTAGE SWING
VOLTAGE DROP FROM SUPPLY, V -- V (V)
S
10
O
300K
3M
1K
.003
SLEW RATE VS. TEMP.
0
300
400
100
200
0
50
75
100
40
SMALL SIGNAL RESPONSE
100K
1
1.5
8
-1.5
1K
10K
100K
1M
125
20
100K
1M
FREQUENCY, F (Hz)
CLOSED LOOP GAIN, A (dB)
CURRENT LIMIT, I (A)
LIM
6
50
125
5
10
15
-1
-.5
0
.5
OS
1M
135
90
45
0
30
10K
CASE TEMPERATURE, T (
C)
C
CASE TEMPERATURE, T (
C)
C
OPEN LOOP PHASE, (
)
180
135
90
45
0
CLOSED LOOP PHASE, (
)
0
AV = 10
CL
AV = 3
CL
AV = 25
CL
AV = 25
CL
AV = 10
CL
AV = 3
CL
O
V +
O
V -
O
QUIESCENT CURRENT, I (mA)
Q
C
Vs =
100V
Vs =
30V
CASE TEMPERATURE, T (
C)
C
25
75
100
0
25
50
125
Vs =
150V
25
75
CASE TEMPERATURE, T (
C)
100
0
25
50
125
C
Q
DRIVER = TL070
V =
60V
V = 95V
S
O
PP
60
80
100
R = .47
CL
R = .68
CL
R = 1.5
CL
C = 22pF
C
C = 22pF
C
40
50
PP
2
3
4
5
6
7
8
-60
-40
-20
0
20
40
60
80
OUTPUT VOLTAGE, V (V)
Q
R = 35
L
R = 1K
L
-SLEW
+SLEW
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
OPERATING
CONSIDERATIONS
PB58 PB58A
GENERAL
Please read the "General Operating Considerations" sec-
tion, which covers stability, supplies, heatsinking, mounting,
current limit, SOA interpretation, and specification interpreta-
tion. Additional information can be found in the application
notes. For information on the package outline, heatsinks, and
mounting hardware, consult the "Accessory and Package
Mechanical Data" section of the handbook.
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 (SOA)
NOTE: The output stage is protected against transient flyback.
However, for protection against sustained, high energy flyback, exter-
nal 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 deter-
mined 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
STABILITY
Stability can be maximized by observing the following guide-
lines:
1. Operate the booster in the lowest practical gain.
2. Operate the driver amplifier in the highest practical effec-
tive 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.
t = 100ms
steady state Tc = 25C
steady state Tc = 85C
steady state Tc = 125C
3
2
1
.2
.3
.4
.5
10
20
30 40 50
100
200 300
OUTPUT CURRENT
FROM +Vs or Vs (A)
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE, Vs Vo (V)
.1
OP
AMP
PB58
C
F
R
F
R
I
+15V
15V
IN
COM
+Vs
Vs
R
CL
OUT
C
C
R
G
R
L
V
IN
GAIN
COMP
C
CH
*
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. H JANUARY 1998
1998 Apex Microtechnology Corp.
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