CIRRUS PA119CE_10

PA119CE
• PA119CEA
PA119CE
• PA119CEA
Product
IPnr no od vuac t i oI nn n o v a t i o n F r o m
PA119CE,
PA119CEA
From
Video Power Operational Amplifier
FEATURES
• VERY FAST SLEW RATE — 900 V/µs
• POWER MOS TECHNOLOGY — 4A peak rating
• LOW INTERNAL LOSSES — 0.75V at 2A
• PROTECTED OUTPUT STAGE — Thermal Shutoff
• WIDE SUPPLY RANGE — ±15V TO ±40V
APPLICATIONS
8-pin TO-3
PACKAGE STYLE CE
• VIDEO DISTRIBUTION AND AMPLIFICATION
• HIGH SPEED DEFLECTION CIRCUITS
• POWER TRANSDUCERS UP TO 5 MHz
• MODULATION OF RF POWER STAGES
• POWER LED OR LASER DIODE EXCITATION
TYPICAL APPLICATION
DESCRIPTION
The PA119 is a high voltage, high current operational amplifier optimized to drive a variety of loads from DC through the
video frequency range. Excellent input accuracy is achieved
with a dual monolithic FET input transistor which is cascoded
by two high voltage transistors to provide outstanding common
mode characteristics. All internal current and voltage levels
are referenced to a zener diode biased on by a current source.
As a result, the PA119 exhibits superior DC and AC stability
over a wide supply and temperature range.
High speed and freedom from second breakdown is assured
by a complementary power MOS output stage. For optimum
linearity, especially at low levels, the power MOS transistors
are biased in a class A/B mode. Thermal shutoff provides
full protection against overheating and limits the heatsink
requirements to dissipate the internal power losses under
normal operating conditions. A built-in current limit of 0.5A
can be increased with the addition of two external resistors.
Transient inductive load kickback protection is provided by
two internal clamping diodes. External phase compensation
allows the user maximum flexibility in obtaining the optimum
slew rate and gain bandwidth product at all gain settings. A
heatsink of proper rating is recommended.
This hybrid circuit utilizes thick film (cermet) resistors, ceramic
capacitors, and silicon 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 hermetically sealed and electrically isolated. The use of compressible thermal washers and/or improper mounting torque will
void the product warranty. Please see “General Operating
Considerations”.
TYPICAL
APPLICATION
+40V
±5mA
1K
DAC
110Ω
EQUIVALENT SCHEMATIC
3
Q1
Up to 4A
Q5
Q9
Q11
Q15
Q13
Q12
Q16
1
D1
Q19
Q20
5
Q17B
Q17A
Q21
4
Q22
Q23
Q24
7
Q25
D2
6
EXTERNAL CONNECTIONS
RCL+
+V
2
3
1
4
+IN
5.6pF
TOP
VIEW
5
–IN
8
6
–40V
PA119 AS FAST POWER DRIVER
www.cirrus.com
Q8
Q10
–V
PA119U
2
Q7
8
±32.5V
PA119
Q2
Q4
Q3
500Ω
RCL+
RCL–
This fast power driver utilizes the 900V/µs slew rate of the
PA119 and provides a unique interface with a current output
DAC. By using the DAC’s internal 1KΩ feedback resistor,
temperature drift errors are minimized, since the temperature
drift coefficients of the internal current source and the internal
feedback resistor of the DAC are closely matched. Gain of
VOUT to IIN is –6.5/mA. The DAC’s internal 1K resistor together
with the external 500Ω and 110Ω form a “tee network” in the
feedback path around the PA119. This effective resistance
equals 6.5KΩ . Therefore the entire circuit can be modeled
as 6.5KΩ feedback resistor from output to inverting input and
a 5mA current source into the inverting input of the PA119.
Now we see the familiar current to voltage conversion for a
DAC where VOUT = –IIN x RFEEDBACK.
Copyright © Cirrus Logic, Inc. 2010
(All Rights Reserved)
PHASE COMPENSATION
OUT
GAIN
CC
CC
1
10
100
1000
330pF
22pF
2.2pF
none
7
RCL–
FEB 20101
APEX − PA119UREVC
PA119CE • PA119CEA
ABSOLUTE MAXIMUM RATINGS
Product Innovation From
SUPPLY VOLTAGE, +VS to –VS
OUTPUT CURRENT, within SOA
POWER DISSIPATION, internal
INPUT VOLTAGE, differential
INPUT VOLTAGE, common mode
TEMPERATURE, pin solder — 10 sec
TEMPERATURE, junction1
TEMPERATURE, storage
OPERATING TEMPERATURE RANGE, case
SPECIFICATIONS
PARAMETER
TEST CONDITIONS 2
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
OFFSET VOLTAGE, vs. supply
OFFSET VOLTAGE, vs. power
BIAS CURRENT, initial
BIAS CURRENT, vs. supply
OFFSET CURRENT, initial
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
COMMON MODE VOLTAGE RANGE3
COMMON MODE REJECTION, DC
TC = 25°C
TC = 25°C to +85°C
TC = 25°C
TC = 25°C to +85°C
TC = 25°C
TC = 25°C
TC = 25°C
TC = 25°C
TC = 25°C
TC = 25°C to +85°C
TC = 25°C to +85°C, VCM = ±20V
GAIN
OPEN LOOP GAIN at 10Hz
OPEN LOOP GAIN at 10Hz
GAIN BANDWIDTH PRODUCT at 1MHz
POWER BANDWIDTH, AV = 100
POWER BANDWIDTH, AV = 1
TC = 25°C, RL = 1KΩ
TC = 25°C, RL = 15Ω
TC = 25°C, CC = 2.2pF
TC = 25°C, CC = 2.2pF
TC = 25°C, CC = 330pF
OUTPUT
VOLTAGE SWING3
VOLTAGE SWING3
VOLTAGE SWING3
SETTLING TIME to .1%
SETTLING TIME to .01%
SLEW RATE, AV = 100
SLEW RATE, AV = 10
TC = 25°C, IO = 4A
TC = 25°C to +85°C, IO = 2A
TC = 25°C to +85°C, IO = 78mA
TC = 25°C, 2V step
TC = 25°C, 2V step
TC = 25°C, CC = 2.2pF
TC = 25°C, CC = 22pF
POWER SUPPLY
VOLTAGE
CURRENT, quiescent
TC = 25°C to +85°C
TC = 25°C
THERMAL
RESISTANCE, AC, junction to case4
RESISTANCE, DC, junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
TC = 25°C to +85°C, F > 60Hz
TC = 25°C to +85°C, F < 60Hz
TC = 25°C to +85°C
Meets full range specifications
NOTES: *
1.
2.
3.
4.
CAUTION
2
MIN
PA119
TYP
±.5
10
10
20
10
.01
5
1011
6
±VS–15 ±VS–12
70
104
74
111
88
100
3.5
250
±VS–5 ±VS–1.5
±VS–3 ±VS–.75
±VS–1 ±VS–.5
.3
1.2
600
900
650
±15
–25
80V
5A
75W
40V
±VS
300°C
175°C
–65 to 150°C
–55 to 125°C
PA119A
MAX
MIN TYP
MAX
UNITS
±.35
±.75
5
15
*
*
5
50
*
3
25
*
*
*
*
mV
µV/°C
µV/V
µV/W
pA
pA/V
pA
MΩ
pF
V
dB
*
*
*
*
*
*
dB
dB
MHz
MHz
kHz
*
*
*
750
*
*
*
*
*
*
*
V
V
V
µs
µs
V/µs
V/µs
*
*
V
mA
±3
30
200
100
*
*
±35
100
±40
*
120
*
*
1.46
1.84
30
1.64
*
*
2.0
*
*
*
+85
*
*
°C/W
°C/W
°C/W
°C
The specification of PA119A is identical to the specification for PA119 in applicable column to the left.
Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation
to achieve high MTTF.
The power supply voltage for all specifications is the TYP rating unless noted as a test condition.
+VS and –VS denote the positive and negative supply rail respectively. Total VS is measured from +VS to –VS.
Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz.
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.
PA119U
PA119CE • PA119CEA
POWER DERATING
70
CURRENT LIMIT, ILIM (A)
CL
20
10
0
0
200
OUTPUT VOLTAGE, VO (V)
SLEW RATE, (V/s)
400
100
80
60
40
10M 100M
10K 100K
1M
FREQUENCY, F (Hz)
POWER SUPPLY REJECTION, PSR (dB)
COMMOM MODE REJECTION, CMR (dB)
COMMON MODE REJECTION
120
PA119U
0
–30
–50 0
2
4 6 10 20 40 60 100 200 400
COMPENSATION CAPACITOR, CC (pF)
1K
10
–20
40
20
VIN = 2V
AV = 10
tr = 10ns
RL = 15W
20
–10
100
80
21
15
11
| +VS | + | –VS | = 80V
8
100K 200K 600K1M 2M 4M 8M
FREQUENCY, F (Hz)
50 100 150 200 250 300
TIME, t (ns)
POWER SUPPLY REJECTION
100
80
60
40
20
0
1K
10K 100K 1M
10M 100M
FREQUENCY, F (Hz)
20M
INPUT NOISE
PULSE RESPONSE
30
RL = 15W
5
30
F
SLEW RATE VS. COMP.
1000
800
600
1
2
3
4
OUTPUT CURRENT, IO (A)
RL = 15W
41
2pF
–V
58
.2p
1.0
0
POWER RESPONSE
80
+V
0.5
30
60
80
40
50
70
TOTAL SUPPLY VOLTAGE, VS (V)
=2
100 1K 10K 100K 1M 10M 100M
FREQUENCY, F (Hz)
.6
=2
0
OUTPUT VOLTAGE SWING
.8
CC
F
RCL = ∞
.5
0pF
0p
F
1.0
1.0
= 33
33
20
2p
pF
RCL =
1.2W
1.2
CC
40
2.
22
1.5
1.4
CC
60
2.0
1.5
VOLTAGE DROP FROM SUPPLY (V)
80
.27
W
0
–50 –25 0 25 50 75 100 125
CASE TEMPERATURE, TC (C)
25
50
75 100 125 150
CASE TEMPERATURE, TC (C)
SMALL SIGNAL RESPONSE
100
2.5
OUTPUT VOLTAGE, VO (VPP )
30
=0
QUIESCENT CURRENT
1.6
INPUT NOISE VOLTAGE, VN (nV/ √ Hz)
50
40
OPEN LOOP GAIN, AOL (dB)
R
3.0
60
–20
CURRENT LIMIT
3.5
30
COMMON MODE VOLTAGE, VCM (VP–P)
INTERNAL POWER DISSIPATION, P(W)
80
NORMALIZED QUIESCENT CURRENT, IQ (X)
Product Innovation From
70
20
15
10
7
5
3
10
1K
100
10K 100K
FREQUENCY, F (Hz)
1M
COMMON MODE VOLTAGE
65
60
55
50
45
40
10
100 1K 10K 100K 1M 10M
FREQUENCY, F (Hz)
3
PA119CE • PA119CEA
Product Innovation From
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 selection; Apex Precision
Power’s complete Application Notes library; Technical Seminar
Workbook; and Evaluation Kits.
CURRENT LIMIT
Q2 (and Q25) limit output current by turning on and removing gate drive when voltage on pin 2 (pin 7) exceeds .65V differential from the positive (negative) supply rail. With internal
resistors equal to 1.2Ω, current limits are approximately 0.5A
with no external current limit resistors. With the addition of
external resistors current limit will be:
ILIM = .65V
RCL
+.54A
To determine values of external current limit resistors:
RCL =
.65V
ICL – .54A
PHASE COMPENSATION
At low gain settings, an external compensation capacitor is
required to insure stability. In addition to the resistive feedback
network, roll off or integrating capacitors must also be considered when determining gain settings. The capacitance values
listed in the external connection diagram, along with good
high frequency layout practice, will insure stability. Interpolate
values for intermediate gain settings.
1. The current handling capability of the MOSFET geometry
and the wire bonds.
2. The junction temperature of the output MOSFETs.
The SOA curves combine the effect of these limits and allow
for internal thermal delays. For a given application, the direction and magnitude of the output current should be calculated
or measured and checked against the SOA curves. This is
simple for resistive loads but more complex for reactive and
EMF generating loads. The following guidelines may save
extensive analytical efforts:
1. Capacitive and inductive loads up to the following maximums
are safe:
±VS
CAPACITIVE LOAD
40V .1µF
11mH
30V 500µF
24mH
20V 2500µF
75mH
15V ∞
100mH
2. Safe short circuit combinations of voltage and current are
limited to a power level of 100W.
3. The output stage is protected against transient flyback.
However, for protection against sustained, high energy
flyback, external fast-recovery diodes should be used.
SUPPLY CURRENT
The PA119 features a class A/B driver stage to charge and
discharge gate capacitance of Q7 and Q19. As these currents
approach 0.5A, the savings of quiescent current over that of a
class A driver stage is considerable. However, supply current
drawn by the PA119, even with no load, varies with slew rate
of the output signal as shown below.
SAFE OPERATING AREA (SOA)
SOA
10
5
4
3
ST
DY
t=
30
s
s
ST
AT
TC=25°C
E
10
20
30
40 50
80 100
INTERNAL VOLTAGE DROP SUPPLY TO OUTPUT, VS-VO (V)
4
SUPPLY CURRENT
VOUT = 60VP-P SINE
RL = 500 Ω
300
200
100
0
30K
10
0m
0m
EA
2
1
t=
400
SUPPLY CURRENT, IS (mA)
OUTPUT CURRENT FROM +VS or -VS
The MOSFET output stage of this power operational amplifier has two distinct limitations:
INDUCTIVE LOAD
100K 300K
1M
3M
FREQUENCY, F (Hz)
10M
OUTPUT LEADS
Keep the output leads as short as possible. In the video
frequency range, even a few inches of wire have significant
inductances, raising the interconnection impedance and limiting the output current slew rate. Furthermore, the skin effect
increases the resistance of heavy wires at high frequencies.
Multistrand Litz Wire is recommended to carry large video
currents with low losses.
PA119U
PA119CE • PA119CEA
Product Innovation From
THERMAL SHUTDOWN
STABILITY
The thermal protection circuit shuts off the amplifier when
the substrate temperature exceeds approximately 150°C. This
allows the heatsink selection to be based on normal operating
conditions while protecting the amplifier against excessive
junction temperature during temporary fault conditions.
Thermal protection is a fairly slow-acting circuit and therefore
does not protect the amplifier against transient SOA violations
(areas outside of the steady state boundary). It is designed to
protect against short-term fault conditions that result in high
power dissipation within the amplifier. If the conditions that
cause thermal shutdown are not removed, the amplifier will
oscillate in and out of shutdown. This will result in high peak
power stresses, destroy signal integrity, and reduce the reliability of the device.
Due to its large bandwidth, the PA119 is more likely to
oscillate than lower bandwidth power operational amplifiers.
To prevent oscillations a reasonable phrase margin must be
maintained by:
1. Selection of the proper phase compensation capacitor. Use
the values given in the table under external connections and
interpolate if necessary.The phase margin can be increased
by using a larger capacitor at the expense of slew rate.
Total physical length (pins of the PA119, capacitor leads
plus printed circuit traces) should be limited to a maximum
of 3.5 inches.
2. Keep the external sumpoint stray capacitance to ground
at a minimum and the sumpoint load resistance (input and
feedback resistors in parallel) below 500Ω. Larger sumpoint
load resistances can be used with increased phase compensation and/or by bypassing the feedback resistor.
3. Connect the case to any AC ground potential.
CONTACTING CIRRUS LOGIC SUPPORT
For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact [email protected]
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
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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 PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE
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PA119U
5