PA09 • PA09A
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PA09 • PA09A
Power Operational Amplifier
FEATURES
•ꢀPOWERꢀMOSꢀTECHNOLOGYꢀ—ꢀ2Aꢀpeakꢀrating
•ꢀHIGHꢀGAINꢀBANDWIDTHꢀPRODUCTꢀ—ꢀ150MHz
•ꢀVERYꢀFASTꢀSLEWꢀRATEꢀ—ꢀ200V/µs
•ꢀPROTECTEDꢀOUTPUTꢀSTAGEꢀ—ꢀThermalꢀshutoff
•ꢀEXCELLENTꢀLINEARITYꢀ—ꢀClassꢀA/Bꢀoutput
•ꢀWIDEꢀSUPPLYꢀRANGEꢀ—ꢀ±12Vꢀtoꢀ±40V
•ꢀLOWꢀBIASꢀCURRENT,ꢀLOWꢀNOISEꢀ—ꢀFETꢀinput
8-PINꢀTO-3
PACKAGEꢀSTYLEꢀCE
APPLICATIONS
•ꢀVIDEOꢀDISTRIBUTIONꢀANDꢀANDꢀAMPLIFICATION
•ꢀHIGHꢀSPEEDꢀDEFLECTIONꢀCIRCUITS
•ꢀPOWERꢀTRANSDUCERSꢀTOꢀ2MHz
•ꢀCOAXIALꢀLINEꢀDRIVERS
•ꢀPOWERꢀLEDꢀORꢀLASERꢀDIODEꢀEXCITATION
DEFLECTIONꢀAMPLIFIERꢀ(Figure 1)
The deflection amplifier circuit of Figure 1 achieves arbi-
trary beam positioning for a fast heads-up display. Maximum
transition times are 4µs while delivering 2A pk currents to the
13mH coil. The key to this circuit is the sense resistor (R )
which converts yoke current to voltage for op amp feedbacSk.
This negative feedback forces the coil current to stay exactly
proportional to the control voltage. The network consisting of
R , RF and CF serves to shift from a current feedback via RS
toDa direct voltage feedback at high frequencies.This removes
the extra phase shift caused by the inductor thus preventing
oscillation. See Application Note 5 for details of this and other
precision magnetic deflection circuits.
DESCRIPTION
The PA09 is a high voltage, high output current operational
amplifier optimized to drive a variety of loads from DC through
thevideofrequencyrange.Excellentinputaccuracyisachieved
with a dual monolithic FET input transistor which is cascoded
bytwohighvoltagetransistorstoprovideoutstandingcommon
modecharacteristics.Allinternalcurrentandvoltagelevelsare
referenced to a zener diode biased on by a current source.As
a result, the PA09 exhibits superior DC and AC stability over
a wide supply and temperature range.
EQUIVALENTꢀSCHEMATIC
2
3
D1
C1
Q6
Highspeedandfreedomfromsecondbreakdownisassured
by a complementary Power MOS output stage. For optimum
linearity, especially at low levels, the Power MOS transistors
are biased in the class A/B mode. Thermal shutoff provides
full protection against overheating and limits the heatsink
requirements to dissipate the internal power losses under
normaloperatingconditions.Abuilt-incurrentlimitprotectsthe
amplifieragainstoverloading.Transientinductiveloadkickback
protectionisprovidedbytwointernalclampingdiodes.External
phase compensation allows the user maximum flexibility in
obtaining the optimum slew rate and gain bandwidth product
at all gain settings. For continuous operation under load, a
heatsink of proper rating is recommended.
Q5
Q3
Q1
Q2
Q4
7
8
Q7
Q13
Q11
Q14
Q8
Q9
1
Q12A
Q12B
C2
Q17
5
4
Q10
Q19
D3
Q15
Q16
Thishybridintegratedcircuitutilizesthickfilm(cermet)resis-
tors, ceramic capacitors and silicon semiconductor chips to
maximize reliability, minimize size and give top performance.
Ultrasonically bonded aluminum wires provide reliable inter-
connections at all operating temperatures.The CE, 8-pinTO-3
D2
Q18
6
EXTERNALꢀCONNECTIONS
package is hermeti-
callysealedandelec-
trically isolated. The
use of com-pressible
thermalwashersand/
or improper mount-
ing torque will void
the product warranty.
Please see “General
Operating Consider-
ations”.
+37V
CC 5pF
di
dt
= 2A/µs
BAL
+VS
3
3
2
7
PA09
6
4
5
i = Vi /RS
OUT
VI
1
8
RT
RS
1
4
5
+IN
–IN
CF
TOP VIEW
LY
470pF
13µH
1Ω
8
RD
3.9K
6
CC
–37V
7
RF
–VS
CC
RC
100Ω
RS
.5Ω
RS = (|+VS| + |–VS|) RT /1.6
NOTE: Input offset voltage trim optional. RT = 10KΩ MAX
FIGURE 1. PA09 AS DEFLECTION AMPLIFIER
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 2009
1
APEX − PA09UREVM
PA09U
http://www.cirrus.com
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