PA12H Datasheet, PDF (1/1 Pages) Cirrus Logic – POWER OPERATIONAL AMPLIFIERS

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FEATURES
• LOW COST 200°C VERSION OF PA12
• OUTPUT CURRENT at 200°C — ±1A
• FULL SPECIFICATIONS — –25°C to +125°C
• WIDE SUPPLY RANGE — ±10 to ±45V
• CURRENT FOLDOVER PROTECTION
• EXCELLENT LINEARITY — Class A/B Output
APPLICATIONS
• MOTOR, VALVE AND ACTUATOR CONTROL
• POWER TRANSDUCERS UP TO 100kHz
• PROGRAMMABLE POWER SUPPLIES UP TO 80V
• TRANSMISSION LINE DRIVER
DESCRIPTION
The PA12H is a low cost, high temperature Power Op Amp
made especially for short term use in extreme environmental
situations such as down hole instrumentation. The amplifier can
power mechanical or electronic transducers and can drive the
long transmission lines associated with these applications.
The PA12H, based on the standard PA12’s very high
power level, leaves a six watt capability after being derated
for operation at a case temperature of 200°C. To meet the
high temperature requirements for up to 200 hours, polyimid
has replaced the standard epoxy for attaching the small signal
devices.
These hybrid integrated circuits utilize thick film conductors,
ceramic capacitors and silicon semiconductors to maximize
reliability, minimize size and give top performance. Ultrasoni-
cally bonded aluminum wires provide reliable interconnections
at all operating temperatures. The 8-pin TO-3 package (see
Package Outlines) is hermetically sealed and isolated. The use
of compressible thermal washers and/or improper mounting
torque will void the product warranty. Please see “General
Operating Considerations”.
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8-PIN TO-3
PACKAGE STYLE CE
SPECIFICATIONS
Specifications of the standard PA12 apply to the PA12H with
the exception of the temperature range extensions
1. The operating and storage temperature ABSOLUTE MAXI-
MUM RATINGS extend to +200°C.
2. Static and dynamic tests are performed at +125°C as shown
in SG 2 and SG 5 of the military PA12M data sheet.
3. Additional tests at T_C = 200°C:
A. Quiescent current = 100mA max at ±V_S = 45.
B. Voltage swing = ±V_S –4 (I_O = 1A, ±V_S = 15)
GENERAL CONSIDERATIONS
The primary aim of the PA12H is to provide a reasonable
level of power output at a minimum cost. To achieve this end,
full dynamic tests are performed up to 125°C, with only minimal
100% testing at 200°C. This approach saves nearly an order
of magnitude over the cost of a fully tested long life product,
but does require recognition of two limitations.
First, input parameters such as voltage offset and bias cur-
rent are not tested above 125°C. This could lead to accuracy
problems if the PA12H is used as a precision computational
element. Solutions to this limitation include contacting the
factory regarding additional testing at higher temperatures or
using high temperature small signal amplifiers for computa-
tional tasks.
The second limitation of life span requires the PA12H to
be used in short term applications. This requirement is man-
dated by the low cost design concept. At 200°C component
degradation is nearly as severe during storage as during actual
operation. This must be taken into account when scheduling
actual implementation of the finished package.
Please consult the PA12 data sheet for basic information
on this amplifier; the PA12M data sheet for details on +125°C
tests, and Power Operational Amplifier handbook section
“General Operating Considerations,” for recommendations
on supplies, stability, heatsinks and bypassing.
EXTERNAL CONNECTIONS
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PA12HU REV H FEBRUARY 1998 © 1998 Apex Microtechnology Corp.
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