Page 1
ELH0101/883/8508901/2YX December 1994 Rev H
ELH0101/883/8508901/2YX
Power Operational Amplifier
Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a ‘‘controlled document’’. Current revisions, if any, to these
specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation. Patent pending.
©
1985 Elantec, Inc.
Features
# 5A peak, 2A continuous output
current
# 10 V/ms slew rate
# 300 kHz power bandwidth
# 850 mW standby power (
g
15V
supplies)
# 300 pA input bias current
# Virtually no crossover distortion
# 2 ms settling time to 0.01%
# 5 MHz gain bandwidth
# MIL-STD-883 devices 100%
manufactured in U.S.A.
Ordering Information
Part No. Temp. Range Package Outline
Ý
ELH0101AK/883Bb55§Ctoa125§C TO-3 MDP0003
ELH0101K/883Bb55§Ctoa125§C TO-3 MDP0003
8508901YX and 8508902YX are the SMD
versions of this device.
Connection Diagram
0101– 1
Top View
Note: Electrically connected internally.
No connection should be made to pin.
General Description
The ELH0101 is a wideband power operational amplifier featuring FET inputs, internal compensation, virtually no crossover
distortion, and rapid settling time. These features make the
ELH0101 an ideal choice for DC or AC servo amplifiers, deflection yoke drivers, programmable power supplies, and disk head
positioner amplifiers.
Elantec facilities comply with MIL-I-45208A and other applicable quality specifications. Elantec’s Military devices are 100%
fabricated and assembled in our rigidly controlled, ultra-clean
facilities in Milpitas, California. For additional information on
Elantec’s Quality and Reliability Assurance policy and procedures request brochure QRA-1.
Equivalent Schematic
0101– 2
TABWIDE
Page 2
ELH0101/883/8508901/2YX
Power Operational Amplifier
Absolute Maximum Ratings
V
S
Supply Voltage
ELH0101, ELH0101A
g
22V
P
D
Power Dissipation at T
A
e
25§C5W
Derate linearly at 25
§
C/W
to zero at 150
§
C
P
D
Power Dissipation at T
C
e
25§C 62W
Derate linearly at 2
§
C/W
to zero at 150
§
C
Differential Input Voltage
ELH0101, ELH0101A
g
40V but
k
g
V
S
VINInput Voltage Range
ELH0101, ELH0101A
g
20V but
k
g
V
S
Peak Output Current (50 ms pulse) 5A
Output Short Circuit Duration
(within rated power dissipation,
R
SC
e
0.35X,T
A
e
25§C) Continuous
T
A
Operating Temperature Range:
ELH0101, ELH0101A
b
55§Ctoa125§C
T
J
Maximum Junction Temperature 150§C
T
ST
Storage Temperature
b
65§Ctoa150§C
Lead Temperature
(Soldering, 10 seconds) 300
§
C
Important Note:
All parameters having Min/Max specifications are guaranteed. The Test Level column indicates the specific device testing actually
performed during production and Quality inspection. Elantec performs most electrical tests using modern high-speed automatic test
equipment, specifically the LTX77 Series system. Unless otherwise noted, all tests are pulsed tests, therefore T
J
e
T
C
e
TA.
Test Level Test Procedure
I 100% production tested and QA sample tested per QA test plan QCX0002.
II 100% production tested at T
A
e
25§C and QA sample tested at T
A
e
25§C,
T
MAX
and T
MIN
per QA test plan QCX0002.
III QA sample tested per QA test plan QCX0002.
IV Parameter is guaranteed (but not tested) by Design and Characterization Data.
V Parameter is typical value at T
A
e
25§C for information purposes only.
DC Electrical Characteristics
(Note 1) V
S
e
g
15V, T
A
e
25§C, V
CM
e
0V
Parameter Description Test Conditions
ELH0101 ELH0101A
Level
Test
Units
Min Typ Max Min Typ Max
V
OS
Input Offset 1 10 1 3 I mV
Voltage
T
MIN
s
T
A
s
T
MAX
,
15 7 I mV
ELH0101
DVOS/DPDChange in Input (Note 2)
Offset Voltage with 150 150 V mV/W
Dissipated Power
DVOS/DT Change in Input
Offset Voltage with 10 10 V mV/
§
C
Temperature
I
B
Input Bias Current 1,000 300 I pA
T
A
s
T
MAX
,
1,000 300 I nA
ELH0101
2
TDis 2.3in
Page 3
ELH0101/883/8508901/2YX
Power Operational Amplifier
DC Electrical Characteristics
(Note 1) V
S
e
g
15V, T
A
e
25§C, V
CM
e
0V Ð Contd.
Parameter Description Test Conditions
ELH0101 ELH0101A
Level
Test
Units
Min Typ Max Min Typ Max
I
OS
Input Offset 250 75 I pA
Current
T
A
s
T
MAX
,
250 75 I nA
ELH0101, A
A
VOL
Large Signal V
O
e
g
10V, R
L
e
10X
50 200 50 200 I V/mV
Voltage Gain
V
O
Output Voltage R
SC
e
0X,A
V
e
1,
g
11.7g12.5
g
11.7g12.5 I V
Swing R
L
e
100X (Note 3)
R
SC
e
0X,A
V
e
1,
g11g
11.6
g11g
11.6 I V
R
L
e
10X (Note 3)
R
SC
e
0X,A
V
e
1,
g
10.5g11
g
10.5g11 I V
R
L
e
5X (Note 3)
CMRR Common-Mode V
IN
e
g
10V
85 100 85 100 I dB
Rejection Ratio
PSRR Power Supply
g
5VsV
S
s
g
15V 85 100 85 100 I dB
Rejection Ratio
a
5VsVS(a)
s
a
15V,
80 110 80 110 I dB
V
S
(b)eb15V
b
5VtVS(b)
t
b
15V,
80 95 80 95 I dB
VS(a)ea15V
I
S
Supply Current 28 35 28 35 I mA
AC Electrical Characteristics
V
S
e
g
15V, T
A
e
T
C
e
T
J
e
25§C
Parameter Description Test Conditions
ELH0101 ELH0101A
Level
Test
Units
Min Typ Max Min Typ Max
e
n
Equivalent Input fe1 kHz
25 25 V nV/
0
Hz
Noise Voltage
C
IN
Input Capacitance fe1 MHz 3 3 V pF
PBW Power Bandwidth, R
L
e
10X,A
V
e
1
300 300 V kHz
b
3dB
SR Slew Rate R
L
e
10X,A
V
e
1
7.5 10 7.5 10 I Vms
ELH0101AK
tr,t
f
Small Signal Rise R
L
e
10X,A
V
e
1
200 200 V ns
or Fall Time
Small Signal R
L
e
10X,A
V
e
1
10 10 V %
Overshoot
3
TDis 3.5inTDis 2.2in
Page 4
ELH0101/883/8508901/2YX
Power Operational Amplifier
AC Electrical Characteristics
V
S
e
g
15V, T
A
e
T
C
e
T
J
e
25§C Ð Contd.
Parameter Description Test Conditions
ELH0101 ELH0101A
Level
Test
Units
Min Typ Max Min Typ Max
GBW Gain-Bandwidth R
L
e %
,A
V
e
1
4 5 4 5 I MHz
Product ELH0101AK
t
S
Large Signal
Settling Time R
L
e %
,A
V
e
12 2Vms
(0.01%)
THD Total Harmonic fe1 kHz, P
O
e
0.5W,
0.008 0.008 V %
Distortion R
L
e
10X
Note 1: Specification is at T
A
e
25§C. Actual values at operating temperature may differ from the T
A
e
25§C value. When supply
voltages are
g
15V, quiescent operating junction temperature will rise approximately 20§C without heatsinking. Accordingly,
V
OS
may change 0.5 mV and IBand IOSwill change significantly during warm-ups. Refer to IBvs. temperature and power
dissipation graphs for expected values.
Note 2: Change in offset voltage with dissipated power is due entirely to average device temperature rise and not to differential
thermal feedback effects. Test is performed without any heatsink.
Note 3: At light loads, the output swing may be limited by the second stage rather than the output stage. See the application section
under ‘‘Output swing enhancement’’ for hints on how to obtain extended operation. R
SC
is the current sense resistor.
4
TDis 1.5in
Page 5
ELH0101/883/8508901/2YX
Power Operational Amplifier
Typical Performance Curves
Power Dissipation
Safe Operating Area Current
Quiescent Power Supply
Input Bias Current Warm-up
Input Bias Current After
Voltage Range
Input Common-Mode
Frequency Response
Open-Loop Small Signal
Frequency
Output Voltage Swing vs
Ratio vs Frequency
Common-Mode Rejection
0101– 3
5
Page 6
ELH0101/883/8508901/2YX
Power Operational Amplifier
Typical Performance Curves
Ð Contd.
Ratio vs Frequency
Power Supply Rejection
Settling Time vs Frequency
Total Harmonic Distortion
vs Gain
Total Harmonic Distortion
Voltage
Equivalent Input Noise
Swing Enhancement
Output Voltage Swing with
Load Resistance
Output Voltage Swing vs
Resistance
Open-Loop Output
Resistance vs Frequency
Open-Loop Output
0101– 4
6
Page 7
ELH0101/883/8508901/2YX
Power Operational Amplifier
Typical Performance Curves
Ð Contd.
0101– 5
Typical Applications
High Power Voltage Follower
0101– 6
High Power Voltage Follower
with Swing Enhancement
0101– 7
Restricting Outputs to Positive Voltage Only
0101– 8
Generating a Split Supply
from a Single Voltage Supply
0101– 9
7
Page 8
ELH0101/883/8508901/2YX
Power Operational Amplifier
Typical Applications
Ð Contd.
g
5tog35 Power Source or Sink
0101– 10
CRT Deflection Yoke Driver
0101– 11
DC Servo Amplifier
0101– 12
High Current Source/Sink
0101– 13
8
Page 9
ELH0101/883/8508901/2YX
Power Operational Amplifier
Applications Information
Input Voltages
The ELH0101 operational amplifier contains
JFET input devices which exhibit high reverse
breakdown voltages from gate to source or drain.
This eliminates the need for input clamp diodes,
so that high differential input voltages may be
applied without a large increase in input current.
However, neither input voltage should be allowed
to exceed the negative supply as the resultant
high current flow may destroy the unit.
Exceeding the negative common-mode limit on
either input will cause a reversal of the phase to
the output and force the amplifier output to the
corresponding high or low state. Exceeding the
negative common-mode limit on both inputs will
force the amplifier output to a high state. In neither case does a latch occur since raising the input back within the common-mode range again
puts the input stage and thus the amplifier in a
normal operating mode.
Exceeding the positive common-mode limit on a
single input will not change the phase of the output, however; if both inputs exceed the limit, the
output of the amplifier will be forced to a high
state.
These amplifiers will operate with the commonmode input voltage equal to the positive supply.
In fact, the common-mode voltage may exceed
the positive supply by approximately 100 mV, independent of supply voltage and over the full operating temperature range. The positive supply
may therefore be used as a reference on an input
as, for example, in a supply current monitor and/
or limiter.
With the ELH0101 there is a temptation to remove the bias current compensation resistor normally used on the non-inverting input of a summing amplifier. Direct connection of the inputs
to ground or a low-impedance voltage source is
not recommended with supply voltages greater
than 3V. The potential problem involves loss of
one supply which can cause excessive current in
the second supply. Destruction of the IC could
result if the current to the inputs of the device is
not limited to less than 100 mA or if there is
much more than 1 mF bypass on the supply bus.
Although difficulties can be largely avoided by
installing clamp diodes across the supply lines on
every PC board, a conservative design would include enough resistance in the input lead to limit
current to 10 mA if the input lead is pulled to
either supply by internal currents. This precaution is by no means limited to the ELH0101.
Layout Considerations
When working with circuitry capable of resolving
picoampere level signals, leakage currents in circuitry external to the op amp can significantly
degrade performance. High quality insulation is a
must (Kel-F and Teflon rate high). Proper cleaning of all insulating surfaces to remove fluxes and
other residues is also required. This includes the
IC package as well as sockets and printed circuit
boards. When operating in high humidity environments or near 0
§
C, some form of surface coating may be necessary to provide a moisture barrier.
The effects of board leakage can be minimized by
encircling the input circuitry with a conductive
guard ring operated at a potential close to that of
the inputs.
Electrostatic shielding of high impedance circuitry is advisable.
Error voltages can also be generated in the external circuitry. Thermocouples formed between dissimilar metals can cause hundreds of microvolts
of error in the presence of temperature gradients.
Since the ELH0101 can deliver large output currents, careful attention should be paid to power
supply, power supply bypassing and load currents. Incorrect grounding of signal inputs and
load can cause significant errors.
9
Page 10
ELH0101/883/8508901/2YX
Power Operational Amplifier
Applications Information
Ð Contd.
Every attempt should be made to achieve a single point ground system as shown in the figure
below.
0101– 14
Bypass capacitor CBXshould be used if the lead
lengths of bypass capacitors C
B
are long. If a single point ground system is not possible, keep signal, load, and power supply from intermingling
as much as possible. For further information on
proper grounding techniques refer to ‘‘Grounding
and Shielding Techniques in Instrumentation’’
by Morrison, and ‘‘Noise Reduction Techniques
in Electronic Systems’’ by Ott (both published
by John Wiley and Sons).
Leads or PC board traces to the supply pins,
short circuit current limit pins, and the output
pin must be substantial enough to handle the
high currents that the ELH0101 is capable of
producing.
Short Circuit Current Limiting
Should current limiting of the output not be necessary, SC
a
should be shorted to Vaand SC
b
should be shorted to Vb. Remember that the
short circuit current limit is dependent upon the
total resistance seen between the supply and current limit pins. This total resistance includes the
desired resistor plus leads, PC Board traces, and
solder joints.* Assuming a zero TCR current limit resistor, typical temperature coefficient of the
short circuit will be approximately 0.3%.
Thermal Resistance
The thermal resistance between two points of a
conductive system is expressed as:
i
12
e
T
1
b
T
2
P
D
§
C/W (1)
where subscript order indicates the direction of
heat flow. A simplified heat transfer circuit for a
cased semiconductor and heatsink system is
shown in the figure below.
The circuit is valid only if the system is in thermal equilibrium (constant heat flow) and there
are, indeed, single specific temperatures, T
J,TC
,
and T
S
, (no temperature distribution in junction,
case, or heatsink). Nevertheless, this is a reasonable approximation of actual performance.
0101– 15
*Short circuit current will be limited to approximately
0.6
RSC
.
The junction-to-case thermal resistance, iJC,
specified in the data sheet depends upon the material and size of the package, die size and thickness, and quality of the die bond to the case or
lead frame. The case-to-heatsink thermal resistance, i
CS
, depends on the mounting of the device
to the heatsink and upon the area and quality of
the contact surface. Typical i
CS
for a TO-3 pack-
age is 0.5
§
C/W to 0.7§C/W, and 0.3§C/W to
0.5
§
C/W using silicone grease.
The heatsink to ambient thermal resistance, i
SA
,
depends on the quality of the heatsink and the
ambient conditions.
10
Page 11
ELH0101/883/8508901/2YX
Power Operational Amplifier
Application Information
Ð Contd.
Cooling is normally required to maintain the
worst case operating junction temperature, T
J
,of
the device below the specified maximum value,
T
J(MAX).TJ
can be calculated from known oper-
ating conditions. Rewriting equation (1), we find:
i
JA
e
T
J
b
T
A
P
D
§
C/W
T
J
e
T
A
a
PDi
JA
§
C
Where: P
D
e
(V
S
b
V
OUT)IOUT
a
l
V
g
(Vb)lI
Q
i
JA
e
i
JC
a
i
CS
a
iSAand
V
S
e
Supply Voltage
i
JC
for the ELH0101 is typically 2§C/W.
Stability and Compensation
As with most amplifiers, care should be taken
with lead dress, component placement and supply decoupling in order to ensure stability. For
example, resistors from the output to an input
should be placed with the body close to the input
to minimize ‘‘pickup’’ and maximize the frequency of the feedback pole by minimizing the capacitance from the input to ground.
A feedback pole is created when the feedback
around any amplifier is resistive. The parallel resistance and capacitance from the input of the
device (usually the inverting input) to AC
ground set the frequency of the pole. In many
instances the frequency of this pole is much
greater than the expected 3 dB frequency of the
closed loop gain and consequently there is negligible effect on stability margin. However, if the
feedback pole is less than approximately six
times the expected 3 dB frequency, a lead capacitor should be placed from the output to the input
of the op amp. The value of the added capacitor
should be such that the RC time constant of this
capacitor and the resistance it parallels is greater
than or equal to the original feedback pole time
constant.
Some inductive loads may cause output stage oscillation. A 0.01 mF ceramic capacitor in series
with a 10X resistor from the output to ground
will usually remedy this situation.
0101– 16
Capacitive loads may be compensated for by traditional techniques. (See ‘‘Operational Amplifiers: Theory and Practice’’ by Roberge, published
by Wiley.)
0101– 17
A similar but alternative technique may be used
for the ELH0101.
0101– 18
11
Page 12
ELH0101/883/8508901/2YX
Power Operational Amplifier
Output Swing Enhancement
When the feedback pin is connected directly to
the output, the output voltage swing is limited
by the driver stage and not by output saturation.
Output swing can be increased by taking gain in
the output stage as shown below in the High
Power Voltage Follower with Swing Enhancement. Whenever gain is taken in the output
stage, either the output stage, or the entire op
amp must be appropriately compensated to account for the additional loop gain.
Output Resistance
The open-loop output resistance of the ELH0101
is a function of the load current. No-load output
resistance is approximately 10X. This decreases
to under an X for load currents exceeding
100 mA.
Burn-In Circuit
0101– 19
12
Page 13
ELH0101/883/8508901/2YX
Power Operational Amplifier
ELH0101 Macromodel
* Connections:ainput
*
l
b
Input
*
ll
V
a
*
lll
Isc
a
*
llll
Feedback
*
lllll
V
b
*
llllll
Isc
b
*
lllllll
Output
*
llllllll
*em0101 6 5213784
.subckt buffer 21 2 1 3 7 8 4
* Resistors
r132710
r2 26 3 10
r3 30 7 50
r422350
r5 29 7 2K
r62222K
r7 27 28 10
r8 24 26 10
* Transistors
q14308qnd
d1 8 4 dclamp
q24231qpd
d2 4 1 dclamp
q372122qp
q4 23 22 24 qn
q5 21 21 26 qn
q62312qp
q722129qn
q8 27 27 21 qn
q9 30 29 28 qp
q103087qn
*Models
.model qpd pnp (is
e
88.013eb12 ikfe5A tfe32nS vafe50V cjee45pF cjce60pF
a
xtbe2.1 bfe12000 nee4 isee1eb10)
.model qnd npn (is
e
88.013eb12 ikfe5A tfe32nS vafe50V cjee45pF cjce60pF
a
xtbe2.1 bfe12000 nee4 isce1eb10)
.model dclamp d (is
e
10eb28 tte100nS)
13
TABWIDE
TDis 5.2in
Page 14
ELH0101/883/8508901/2YX
Power Operational Amplifier
ELH0101 Macromodel
Ð Contd.
.model qp pnp (ise10eb15 xtie3ege1.11V vafe91V bfe200 nee2.321 isee6.2fA
a
ikfe500mA xtbe2.1 bre3.3 nce2 cjce14.6pF vjce0.75V mjce0.3333 fce0.5 cjee20pF
a
vjee0.75V mjee0.3333 tre29nS tfe0.4nS itfe0.4 vtfe10 xtfe2rbe10)
.model qn npn (is
e3eb
15 xtie3ege1.11V vafe151V bfe220 nee1.541 isee14fA
a
ikfe500mA xtbe2.1 bre6nce2 cjce14.6pF vjce0.75V mjce0.3333 fce0.5 cjee26pF
a
vjee0.75V mjee0.3333 tre51nS tfe0.4nS itfe0.6 vtfe1.7 xtfe2rbe10)
.ends buffer
* lf156 Subcircuit
* Connections:
a
Input
*
l
b
Input
*
ll
V
a
*
lll
V
b
*
llll
Output
*
lllll
.subckt lf156 6 52721
*Input Stage
vcm2 40 7 2
rd1 40 80 1.06K
rd2 40 90 1.06K
j1 80 102 12 jm1
j2 90 103 12 jm2
cin 5 6 4pF
rg1 5 102 2
rg2 6 103 2
* CM Clamp
dcm1 107 103 dm4
dcm2 105 107 dm4
vcmc 105 7 4V
ecmp 106 7 103 7 1
rcmp 107 106 10K
dcm3 109 102 dm4
dcm4 105 109 dm4
ecmn 108 2 102 2 1
rcmn 109 108 10K
cl 80 90 15pF
iss 2 12 0.48mA
gosit 2 12 90 80 2.4e
b
4
* Intermediate Stage
gcm 0 88 12 0 9.425e
b
9
ga 88 0 80 90 9.425e
b
4
r2 88 0 100K
c2 91 88 30pF
gb 91 0 88 0 28.6
ro2 91 0 74
14
TABWIDE
TDis 5.8in
Page 15
ELH0101/883/8508901/2YX
Power Operational Amplifier
ELH0101 Macromodel
Ð Contd.
* Output Stage
rso 91 21 1
ecl 18 0 91 21 20.69
gcl0882001
rcl 20 0 1K
d1 18 20 dm1
d2 20 18 dm1
d3a 131 70 dm3
d3b 13 131 dm3
gpl0887021
vc 13 21 3.1552V
rpla 2 70 10K
rplb 2 131 100K
d4a 60 141 dm3
d4b 141 14 dm3
gnl0886071
ve 21 14 3.1552V
rnla 60 7 10K
rnlb 141 7 100K
ip 2 7 4.52mA
dsub 7 2 dm2
* Models
.model jm1 pjf (is
e
3.15eb11 betae9.2528eb4 vtoeb1.0)
.model jm2 pjf (is
e
2.85eb11 betae9.2528eb4 vtoeb0.999)
.model dm1 d (is
e
1.0eb15)
.model dm2 d (is
e
8.0eb16 bve52.8)
.model dm3 d (is
e
1.0eb16)
.model dm4 d (is
e
1.0eb9)
ends lf156
* lf156 model courtesy of Linear Technology Corp.
15
TDis 3.9in
Page 16
ELH0101/883/8508901/2YXDecember 1994 Rev H
ELH0101/883/8508901/2YX
Power Operational Amplifier
ELH0101 Macromodel
Ð Contd.
0101– 20
General Disclaimer
Specifications contained in this data sheet are in effect as of the publication date shown. Elantec, Inc. reserves the right to make changes
in the circuitry or specifications contained herein at any time without notice. Elantec, Inc. assumes no responsibility for the use of any
circuits described herein and makes no representations that they are free from patent infringement.
Elantec, Inc.
1996 Tarob Court
Milpitas, CA 95035
Telephone: (408) 945-1323
(800) 333-6314
Fax: (408) 945-9305
European Office: 44-71-482-4596
WARNING Ð Life Support Policy
Elantec, Inc. products are not authorized for and should not be
used within Life Support Systems without the specific written
consent of Elantec, Inc. Life Support systems are equipment intended to support or sustain life and whose failure to perform
when properly used in accordance with instructions provided can
be reasonably expected to result in significant personal injury or
death. Users contemplating application of Elantec, Inc. products
in Life Support Systems are requested to contact Elantec, Inc.
factory headquarters to establish suitable terms & conditions for
these applications. Elantec, Inc.’s warranty is limited to replacement of defective components and does not cover injury to persons or property or other consequential damages.
Printed in U.S.A.16
Loading...