NTE7118 Integrated Circuit Audio Power Amplifier, 50W Description: The NTE7118 integrated circuit is a hi–fi power amplifier in a 9–Lead SIP type package designed for use as a building block in radio, TV, and other audio applications. The high performance of the IC meets the requirements of digital sources (e.g. Compact Disc equipment). The NTE7118 is totally protected, the two output transistors both having tthermal and SOAR protection. This device also has a mute function that can be arranged for a period after power–on with a delay time fixed by external components. The NTE7118 device is intended for symmetrical power supplies but an asymmetrical supply may also be used. Features: D High Output Power (Also with Bootstrap) D Low Offset Voltage D Good Ripple Rejection D Mute/Stand–by Facilities D Thermal Protection D Protected Against Electrostatic Discharge D No Switch–On or Switch–Off Clicks D Very Low Thermal Resistance D Safe Operating Area (SOAR) Protection D Short–Circuit Protection Absolute Maximum Ratings: Supply Voltage (Pin6 to Pin4), VP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±30V Bootstrap Voltage (Pin7 to Pin4), Vbstr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70V Output Current (Repetitive Peak), IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8A Mute Voltage (Pin3 to Pin4), Vm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V Thermal Shut–Down Protection Time (Note 1), tpr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Hour Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C Thermal Resistance, Junction–to–Mounting Base, Rth j–mb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1K/W Note 1. Symmetrical power supply: AC and DC short–circuit protected. Asymmetrical power supply: AC short–circuit protected. Driven by a pink–noise voltage. Electrical Characteristics: (VP = ±27.5V, RL = 8Ω, f = 1kHz, TA = +25°C unless otherwise specified) Parameter Supply Voltage Range (Pin6 to Pin4) Maximum Output Current (Peak Value) Symbol Test Conditions Min Typ Max Unit VP ±9 – ±30 V IOMmax 6.4 – – A V3–4 6 – 7 V Operating State Input Voltage (Pin3 to Pin4) Total Quiescent Current Itot RL = ∞ 30 60 90 mA Output Power PO THD = –60dB 37 40 – W THD = –20dB – 51 – W VP = ±23V, THD = –60dB, RL = 8Ω – 28 – W VP = ±23V, THD = –60dB, RL = 4Ω – 50 – W PO = 32W – –90 –80 dB PO = 32W, Note 2 – –80 – dB Total Harmonic Distortion THD Intermodulation Distortion dim Power Bandwidth Slew Rate B (–3dB) THD = –60dB dV/dt Hz – 10 – V/µs – 30 – dB – 85 – dB Closed Loop Voltage Gain Gc Open Loop Voltage Gain Go Input Impedance |Zi| Note 4 1 – – MΩ Signal–to–Noise Ratio S/N PO = 50mW, Note 5 80 – – dB Output Offset Voltage VO – 2 * V Input Bias Current II – 0.1 * µA Output Impedance |Zo| – – 0.1 W Ripple Frequency = 100Hz, Ripply Voltage = 500mVeff, (RMS Value) Source Resistance = 2kΩ * – – dB Note 6 – – * µA V3–4 2 – 4.5 V Offset Voltage VO – * – V Output Voltage VO – 100 – µV Ripple Rejection RR – 70 – dB V3–4 0 – 1 V Total Quiescent Current Itot – 20 – mA Ripple Rejection RR – 70 – dB Supply Voltage to Obtain Steady State ±VP 4.5 – 7.0 V Supply Voltage Ripple Rejection Quiescent Current into Pin2 SVRR I2 Note 3 20 to 25,000 Mute State Voltage on Pin3 Vi(rms) = 2V, f = 1kHz Standby State Voltage on Pin3 * Value to be fixed. Note 2. Measured with two superimposed signals of 50Hz and 7kHz with an amplitude relationship of 4:1. Note 3. The closed loop gain is determined by external resistors and is variable between 20dB and 46dB. Note 4. The input impedance is determined by the bias resistor. Note 5. The noise output voltage is measured in a bandwidth of 20Hz to 20kHz with a source resistance of 2kΩ. Note 6. The quiescent current into Pin2 has an impact on the mute time. Pin Connection Diagram (Front View) 1 Input 2 Protection 3 Mute 4 –VCC 5 Output 6 +VCC 7 Bootstrap 8 GND 9 Feedback .961 (24.4) .780 (19.8) .185 (4.7) .489 (12.4) 9 1 .079 (2.0) .674 (17.0) .079 (2.0) .100 (2.54)