# STK4050 II AF Power Amplifier

## Features
· Thick Film Hybrid IC
· Compact package for thin-type audio sets
· Pin-compatible series with outputs from 20 to 200W
· Designed for easy heatsink implementation
· Constant-current circuit minimizes switch-on/off shock noise
· Customizable protection circuits (short-circuit, thermal shutdown, muting)

## Specifications
Maximum Ratings (at Ta = 25°C)
· Maximum Supply Voltage (VCC): ±95V
· Thermal Resistance (θj-c): 0.95 °C/W
· Junction Temperature (Tj): 150 °C
· Operating Substrate Temperature (Tc): 125 °C
· Storage Temperature (Tstg): -30 to +125 °C

Recommended Operating Conditions (at Ta = 25°C)
· Recommended Supply Voltage (VCC): ±66V
· Load Resistance (RL): 8Ω

Operating Characteristics (at Ta = 25°C, VCC = ±66V, RL = 8Ω, Rg = 600Ω, VG = 40dB)
· Quiescent Current (ICCO): 15-120mA
· Output Power (PO): 200W minimum (THD = 0.4%)
· Total Harmonic Distortion (THD): 0.3% maximum (PO = 1.0W, f = 1kHz)
· Frequency Response: 20Hz to 50kHz
· Input Impedance: 55kΩ
· Output Noise Voltage: 1.2mVrms maximum
· Neutral Voltage: -70 to +70 mV

## Notes
· Designed for constant-voltage supply operation.
· Output noise voltage is measured with a specified transformer supply.
· The waveform does not include pulse noise.

## Safety Information
· Not intended for use in critical applications (surgical implants, life support, aerospace, nuclear control, vehicles, disaster/crime prevention).
· Information is for example only and not guaranteed for volume production.
· Specifications subject to change without notice (as of June 1997).