PB51ED [CIRRUS]
Operational Amplifier;
CIRRUS LOGIC 
PB51 • PB51A
Power Booster Amplifier
DESCRIPTION
FEATURES
The PB51 is a high voltage, high current amplifier de-
signed 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 cur-
rent 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 prop-
erly.
• 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 Mini-
mum
• LOW QUIESCENT CURRENT – 12mA Typical
• EVALUATION KIT – EK29
The output stage utilizes complementary MOSFETs,
providing symmetrical output impedance and eliminat-
ing 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. Com-
pensation is not required for most driver/gain configura-
tions, 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.
APPLICATIONS
• HIGH VOLTAGE INSTRUMENTATION
• ELECTROSTATIC TRANSDUCERS &
DEFLECTION
• PROGRAMMABLE POWER SUPPLIES
UP TO 280V P-P
This hybrid circuit utilizes a beryllia (BeO) sub-
strate, thick film resistors, ceramic capaci-
tors and semiconductor chips to maximize reli-
ability, minimize size and give top performance.
Ultrasonically bonded aluminum wires provide reliable
interconnections at all operating temperatures. The 12-
pin Power SIP package is electrically isolated.
EQUIVALENTꢀSCHEMATIC
+VS
8
Q2
Q1
IN
1
6
Q4
Q5
Q6
GAIN
OUT
ILIM
12
9
3.1K
Q7
2
5
COM
CC
Q11
Q8
Q9
Q10
–VS
11
Copyright © Cirrus Logic, Inc. 2011
OCTꢀ2011
APEXꢀ−ꢀPB51UREVF
(All Rights Reserved)
ꢀ
www.cirrus.com
PB51
1.ꢀCHARACTERISTICSꢀANDꢀSPECIFICATIONS
ABSOLUTEꢀMAXIMUMꢀRATINGS
Parameter
SUPPLY VOLTAGE, +VS to –VS
OUTPUT CURRENT, within SOA
Symbol
Min
Max
300
2.0
Units
V
A
POWER DISSIPATION, internal at TC = 25°C
(Note 1)
83
W
INPUT VOLTAGE, referred to COM
TEMPERATURE, pin solder–10s max.
TEMPERATURE, junction (Note 1)
TEMPERATURE RANGE, storage
OPERATING TEMPERATURE RANGE, case
-15
15
260
175
125
85
V
°C
°C
°C
°C
-55
-25
SPECIFICATIONSꢀ(PERꢀAMPLIFIER)
PB51
PB51A
TESTꢀCONDITIONSꢀ
PARAMETER
(Noteꢀ2)
MIN
TYP MAX MIN TYP MAX UNITS
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. tempera- Full temperature range
±.75
-4.5
±1.75
-7
*
*
±1.0
*
V
mV/°C
ture
(Note 3)
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
CLOSED LOOP GAIN RANGE
25
3
50
3
*
*
*
*
*
*
*
k
pF
V/V
%
10
25
*
*
*
GAIN ACCURACY, internal Rg, Rf AV = 3
±10
±15
±15
±25
GAIN ACCURACY, external Rf
PHASE SHIFT
AV = 10
%
f = 10kHz, AVCL = 10,
CC = 22pF
10
60
*
*
°
°
f = 200kHz, AVCL = 10,
CC = 22pF
OUTPUT
IO = 1.5A (PB58),
2A (PB58A)
VS–11
VS–8
VS–15 VS–11
V
VOLTAGE SWING
VOLTAGE SWING
VOLTAGE SWING
CURRENT, continuous
SLEW RATE
IO = 1A
VS–10
VS–8
1.5
VS–7
VS–5
*
*
*
*
V
V
IO = 0.1A
2.0
75
A
Full temperature range
Full temperature range
RL = 100, 2V step
VC = 100 VP-P
50
100
2200
2
*
*
*
*
*
V/µs
pF
CAPACITIVE LOAD
SETTLING TIME to .1%
POWER BANDWIDTH
µs
160
230
100
240
kHz
Khz
CC = 22pF, AV = 25,
VCC = ±100
SMALL SIGNAL BANDWIDTH
SMALL SIGNAL BANDWIDTH
CC = 22pF, AV = 3,
VCC = ±30
1
*
MHz
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PB51
PB51
PB51A
TYP MAX UNITS
TESTꢀCONDITIONSꢀ
(Noteꢀ2)
PARAMETER
MIN
TYP MAX MIN
POWERꢀSUPPLY
±15
(Note 6)
VOLTAGE, ±VS (Note 4)
Full temperature range
±60
±150
18
*
*
*
*
V
VS = ±15
VS = ±60
VS = ±150
11
12
14
*
*
*
mA
mA
mA
CURRENT, quiescent
THERMAL
RESISTANCE,
AC junction to case (Note 5)
Full temp. range,
f > 60Hz
1.2
1.3
1.8
*
*
*
°C/W
RESISTANCE,
DC junction to case
Full temp. range,
f < 60Hz
1.6
30
25
*
*
*
°C/W
°C/W
°C
RESISTANCE, junction to air
Full temperature range
Meets full range
specifications
TEMPERATURE RANGE, case
-25
85
*
*
NOTES: * The specification of PB51A is identical to the specification for PB51 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, TC = 25°C unless otherwise noted.
3. Guaranteed by design but not tested.
4. +VS and –VS 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. +VS/–VS must be at least 15V above/below COM.
The PB51 is constructed from MOSFET transistors. ESD handling procedures must be observed.
CAUTION
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.
EXTERNALꢀCONNECTIONS
1
2
3
4
5
6
7
8
9
10
11
12
IN
NC
NC NC
NC
-VS
+VS
RCL
RG
COM
CC
OUT
TYPICALꢀAPPLICATION
CF
RF
+15V
+Vs
IN
RCL
RI
VIN
12-pinꢀSIP
PACKAGEꢀSTYLEꢀDP
Formed leads available. See package styles ED & EE
OP
AMP
OUT
CC
RG
PB51
COM
RL
–15V
–Vs
PB51Uꢀ ꢀ
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3ꢀ
PB51
2.ꢀ
100
80
TYPICALꢀPERFORMANCEꢀGRAPHS
POWER DERATING
CURRENT LIMIT
OUTPUT VOLTAGE SWING
2
1.5
1
14
12
10
60
VO
-
8
6
40
20
VO
+
.5
0
0
–25
4
.01
0
25
50
75 100 125
–25
0
25
50
75 100 125
.05
1
1.5
2
CASE TEMPERATURE, TC (°C)
CASE TEMPERATURE, TC (°C)
OUTPUT CURRENT, IO (A)
SMALL SIGNAL RESPONSE
SMALL SIGNAL RESPONSE
SMALL SIGNAL RESPONSE
0
80
60
30
20
10
0
–45
–90
AVCL = 3
AVCL = 25
–45
AVCL = 10
AVCL = 25
AVCL = 10
AVCL = 3
40
20
0
–90
–135
–180
0
–135
–180
CC = 22pF
CC = 22pF
–10
100
1K
10K 100K
1M
10M
1K
10K
100K
1M
10M
1K
10K
100K
1M
10M
FREQUENCY, F (Hz)
FREQUENCY, F (Hz)
FREQUENCY, F (Hz)
QUIESCENT CURRENT
INPUT OFFSET VOLTAGE
SLEW RATE VS. TEMP.
400
.5
0
20
15
10
300
200
-.5
-SLEW
-1
5
0
100
0
-1.5
–25
–25
0
25
50
75 100 125
0
25
50
75 100 125
–25
0
25
50
75 100 125
CASE TEMPERATURE, TC (°C)
CASE TEMPERATURE, TC (°C)
CASE TEMPERATURE, TC (°C)
POWER RESPONSE
PULSE RESPONSE
HARMONIC DISTORTION
300
200
80
60
.1
.03
.01
DRIVER = TL070
VS = 60V
VO = 95VP-P
40
100
20
0
50
40
-20
-40
-60
-80
30
.003
.001
20
10
100K
300
1K
3K
10K
30K
300K
1M
3M
10M
1
2
3
4
5
6
7
8
FREQUENCY, F (Hz)
FREQUENCY, F (Hz)
TIME, t (µs)
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PB51
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.Cirrus.com for design tools
that help automate tasks such as calculations for stability, internal power dissipation, current limit; heat sink selec-
tion; Apex Precision Power’s complete Application Notes library; Technical Seminar Workbook; and Evaluation Kits.
CURRENTꢀLIMIT
For proper operation, the current limit resistor (RCL) must be connected as shown in the external connection dia-
gram. 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:
+IL=.65/RCL+ .010, -IL = .65/RCL.
SOA
SAFEꢀOPERATINGꢀAREA
3
NOTE: The output stage is protected against transient flyback.
2
However, for protection against sustained, high energy flyback,
external fast-recovery diodes should be used.
1
COMPOSITEꢀAMPLIFIERꢀCONSIDERATIONS
.5
.4
.3
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. Op-
erating 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.
.2
.1
10
20 30 40 50
100
200 300
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE, VS –VO (V)
GAINꢀSET
The booster’s closed-loop gain is given by the equation below. 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.
RG = [(Av-1) • 3.1K] - 6.2K
RG + 6.2K
Av =
+1
3.1K
Example: Inverting configuration (figure 1) with
Ri = 2K, Rf = 60K, Rg = 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 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.
PB51Uꢀ ꢀ
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5ꢀ
PB51
DRIVER
CCH
CF
CC
FPBW
SR
OP07
741
LF155
LF156
TL070
-
22p
18p
4.7p
4.7p
15p
22p
10p
10p
10p
10p
4kHz
20kHz
60kHz
80kHz
80kHz
1.5
7
>60
>60
>60
-
-
-
22p
For: RF = 33K, RI = 3.3K, RG = 22K
TABLE 1.TYPICAL VALUES FOR CASE WHERE OP AMP
EFFECTIVE GAIN = 1.
CF
RF
+15V
CCH
+Vs
IN
RCL
RI
OP
AMP
OUT
VIN
PB51
COM
COMP
–15V
RL
CC
GAIN
RG
–Vs
SLEWꢀRATE
The slew rate of the composite amplifier is equal to the slew rate of the driver times the booster gain, with a maxi-
mum value equal to the booster slew rate.
OUTPUTꢀSWING
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.
CONTACTINGꢀCIRRUSꢀLOGICꢀSUPPORT
For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact apex.support@cirrus.com.
International customers can also request support by contacting their local Cirrus Logic Sales Representative.
To find the one nearest to you, go to www.cirrus.com
IMPORTANT NOTICE
Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject
to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant
information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale
supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus
for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third
parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights,
copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives con-
sent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent
does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROP-
ERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE
SUITABLE FOR USE IN PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PROD-
UCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUS-
TOMER’S RISK AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE
CUSTOMER OR CUSTOMER’S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES,
BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL
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Cirrus Logic, Cirrus, and the Cirrus Logic logo designs, Apex Precision Power, Apex and the Apex Precision Power logo designs are trademarks of Cirrus Logic, Inc.
All other brand and product names in this document may be trademarks or service marks of their respective owners.
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