PB50_06 Datasheet, PDF (1/4 Pages) Cirrus Logic – POWER BOOSTER AMPLIFIER

MICROTECHNOLOGY
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PB50
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FEATURES
• WIDE SUPPLY RANGE — ±30V to ±100V
• HIGH OUTPUT CURRENT — Up to 2A Continuous
• VOLTAGE AND CURRENT GAIN
• HIGH SLEW RATE — 50V/µs Minimum
• PROGRAMMABLE OUTPUT CURRENT LIMIT
• HIGH POWER BANDWIDTH — 160 kHz Minimum
• LOW QUIESCENT CURRENT — 12mA Typical
APPLICATIONS
• HIGH VOLTAGE INSTRUMENTATION
• Electrostatic TRANSDUCERS & DEFLECTION
• Programmable Power Supplies Up to 180V p-p
DESCRIPTION
The PB50 is a high voltage, high current amplifier designed
to provide voltage and current gain for a small signal, general
purpose op amp. Including the power booster within the feed-
back loop of the driver amplifier results in a composite amplifier
with the accuracy of the driver and the extended output voltage
range and current capability of the booster. The PB50 can also
be used without a driver in some applications, requiring only
an external current limit resistor to function properly.
The output stage utilizes complementary MOSFETs, provid-
ing symmetrical output impedance and eliminating secondary
breakdown limitations imposed by Bipolar Junction Transis-
tors. Internal feedback and gainset resistors are provided for
a pin-strappable gain of 3. Additional gain can be achieved
with a single external resistor. Compensation is not required
for most driver/gain configurations, but can be accomplished
with a single external capacitor. Although the booster can
be configured quite simply, enormous flexibility is provided
through the choice of driver amplifier, current limit, supply
voltage, voltage gain, and compensation.
This hybrid circuit utilizes a beryllia (BeO) substrate, thick
film resistors, ceramic capacitors and semiconductor chips to
maximize reliability, minimize size and give top performance.
Ultrasonically bonded aluminum wires provide reliable inter-
connections at all operating temperatures. The 8-pin TO-3
package is electrically isolated and hermetically sealed using
one-shot resistance welding. The use of compressible isolation
washers voids the warranty.
TYPICAL APPLICATION
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Figure 1. Inverting composite amplifier.
EQUIVALENT SCHEMATIC
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EXTERNAL CONNECTIONS
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