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Nte 1850 ic dual 12W/channel audio power amplifier
NTE 1850 IC Dual 12W/Channel Audio Power Amplifier.
The NTE1850 is a dual Hi−Fi audio power amplifier in a 9−Lead SIP type package designed for
mains−fed applications such as stereo TV sound and stereo radio. The circuit is optimal for symmetrical
power supplies but is also well suited to asymmetrical power supply systems. An output power
of 2 x 12W (THD = 0.5%) can be delivered into an 8Ω load with a symmetrical power supply of ±16V.
The gain is fixed internally at 30dB, but can be changed externally if required. Internal gain fixing gives
low gain spread and very good balance between the amplifiers (0.2dB).
A special feature is an input mute circuit which provides suppression of unwanted signals at the inputs
during switching on and off. This circuit disconnects the non−inverting inputs when the supply voltage
is below ±6V, while allowing the amplifiers to remain in their DC operating condition.
Two thermal protection circuits are provided, one monitors the average junction temperature and the other
the instantaneous temperature of the power transistors. Both protection circuits activate at +150°C, allowing
safe operation to a maximum junction temperature of +150°C without added distortion.
Few External Components Required
Input Muted During Power ON/OFF
Low Offset Voltage Between Output and GND
Excellent Gain Balance Between Channels
Supply Voltage (Pin5 and Pin7), VCC = V5, 7−3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +20V
Non−Repetitive Peak Output Current (Pin4 and Pin6), IOSM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4A
Total Power Dissipation (TA = +25°C, Infinite Heatsink), PTOT . . . . . . . . . . . . . . . . . . . . . . . . . . . 15W
Derate Above 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5°C/W
Operating Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65° to +150°C
Short−Circuit Time (Outputs Short−Circuited to GND), tSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Hr
Thermal Resistance, Junction−to−Case, RthJC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25°C/W
DC Electrical Characteristics:
Parameter Symbol Test Conditions Min Typ Max Unit
Repetitive Peak Output Current I
(Symmetrical Power Supply, VCC = ±16V, RL = 8Ω, TA = +25°C, f = 1kHz)
Total Harmonic Distortion THD P
Power Bandwidth B THD = 0.5%, Note 1 20Hz to 20kHz
NO(RMS) RS = 2kΩ, unweighted (20Hz to 2okHz) − 70 140 μV
Ripple Rejection RR Note 2 40 60
(Symmetrical Power Supply, VCC = ±4V, RL = 8Ω, TA = +25°C, f = 1kHz)
NO(RMS) RS = 2kΩ, unweighted (20Hz to 2okHz) − 70 140 μV
(Asymmetrical Power Supply, VCC = ±4V, RL = 8Ω, TA = +25°C, f = 1kHz)
Total Harmonic Distortion THD P
Power Bandwidth B THD = 0.5%, Note 1 40Hz to 20kHz
NO(RMS) RS = 2kΩ, unweighted (20Hz to 2okHz) − 70 140 μV
Ripple Rejection RR Note 2 40 50
Note 1. Power Bandwidth at PO(MAX) = −3dB.
Note 2. Ripple Rejection at RS = 0Ω, f = 100Hz to 20kHz; ripple voltage = 200mV (RMS value) applied
to positive or negative supply rail.
