PA34
POWER OPERATIONAL AMPLIFIER

FEATURES
• LOW COST
• WIDE COMMON MODE RANGE —
        Includes negative supply
• WIDE SUPPLY VOLTAGE RANGE
        Single supply: 5V to 40V
        Split supplies: ±2.5V to ±20V
• HIGH EFFICIENCY — |Vs–2.8V| at 2.5A typ
• HIGH OUTPUT CURRENT — 2.5A min
• INTERNAL CURRENT LIMIT
• LOW DISTORTION
APPLICATIONS
• HALF & FULL BRIDGE MOTOR DRIVERS
• AUDIO POWER AMPLIFIER
• IDEAL FOR SINGLE SUPPLY SYSTEMS
        5V — Peripherals
        12V — Automotive
        28V — Avionic

DESCRIPTION
The PA34 consists of a monolithic power op amp in a 7-pin TO220 package.
The wide common mode input range includes the negative rail, facilitating single supply applications. It is possible to have a “ground based” input driving a single supply ampli? er with ground acting as the “second” or “bottom” supply of the ampli? er.
The output stage is also well protected. They possess internal current limit circuits. While the device is well protected, the Safe Operating Area (SOA) curve must be observed. Proper heatsinking is required for maximum reliability.The tab of the 7 pin plastic package is tied to –VS.
R1 and R2 set up ampli? er A in a non-inverting gain of 2.8. Amp B is set up as a unity gain inverter driven from the output of amp A. Note that amp B inverts signals about the reference node, which is set at mid-supply (14V) by R5 and R6. When the command input is 5V, the output of amp A is 14V. Since this is equal to the reference node voltage, the output of amp B is also 14V, resulting in 0V across the motor. Inputs more positive than 5V result in motor current ? ow from left to right. Inputs less positive than 5V drive the motor in the opposite direction. (See PA21/25/26 Datasheet for additional application description.)