APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com

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FEATURES

• POWER MOS TECHNOLOGY — 2A peak rating

• HIGH GAIN BANDWIDTH PRODUCT — 150MHz

• VERY FAST SLEW RATE — 200V/µs

• PROTECTED OUTPUT STAGE — Thermal shutoff

• EXCELLENT LINEARITY — Class A/B output

• WIDE SUPPLY RANGE — ±12V to ±40V

• LOW BIAS CURRENT, LOW NOISE — FET input

APPLICATIONS

• VIDEO DISTRIBUTION AND AND AMPLIFICATION

• HIGH SPEED DEFLECTION CIRCUITS

• POWER TRANSDUCERS TO 2MHz

• COAXIAL LINE DRIVERS

• POWER LED OR LASER DIODE EXCITATION

DESCRIPTION

The PA09 is a high voltage, high output 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 PA09 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 the 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 protects the

amplifier against overloading. 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. For continuous operation under load, a

heatsink of proper rating is recommended.

This hybrid integrated circuit utilizes thick film (cermet) resis-

tors, ceramic capacitors and silicon semiconductor chips to

maximize reliability, minimize size and give top performance.

Ultrasonically bonded aluminum wires provide reliable intercon-

nections at all operating temperatures. The CE, 8-pin TO-3

package is hermeti-

cally sealed and elec-

trically isolated. The

use of com-pressible

thermal washers and/

or improper mounting

torque will void the

product warranty.

Please see “General

Operating Consider-

ations”.

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DEFLECTION AMPLIFIER (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 feedback.

This negative feedback forces the coil current to stay exactly

proportional to the control voltage. The network consisting of

R

a 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.

EQUIVALENT SCHEMATIC

EXTERNAL CONNECTIONS

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8-PIN TO-3

PACKAGE STYLE CE