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NTE1850 Integrated Circuit Dual 12W/Channel Audio Power Amplifier
Description: 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 8 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 +150C, allowing safe operation to a maximum junction temperature of +150C without added distortion. Applications: Features: D Few External Components Required D Stereo D Input Muted During Power ON/OFF D TV Sound D Low Offset Voltage Between Output and GND D Radio D Excellent Gain Balance Between Channels D Short-Circuit Protected D Thermally Protected Absolute Maximum Ratings: Supply Voltage (Pin5 and Pin7), VCC = V5, 7-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +20V Non-Repetitive Peak Output Current (Pin4 and Pin6), IOSM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4A Total Power Dissipation (TA = +25C, Infinite Heatsink), PTOT . . . . . . . . . . . . . . . . . . . . . . . . . . . 15W Derate Above 25C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5C/W Operating Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C Short-Circuit Time (Outputs Short-Circuited to GND), tSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Hr Thermal Resistance, Junction-to-Case, RthJC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25C/W
DC Electrical Characteristics:
Parameter Supply Voltage Range Repetitive Peak Output Current Symbol VCC IORM VCC ITOT PO THD B GV VNO(RMS) RS = 2k, unweighted (20Hz to 2okHz) |Zi| RR IIB VOFF VCC ITOT VOUT RR VOFF ITOT PO THD B GV GV VNO(RMS) RS = 2k, unweighted (20Hz to 2okHz) |Zi| RR Note 2 RS = 0 Without RL VI = 600mV Note 2 WRT GND WRT GND Note 2 RS = 0 Without RL THD = 0.5% THD = 10% Total Harmonic Distortion Power Bandwidth Voltage Gain Noise Output Voltage Input Impedance Ripple Rejection Channel Separation Input Bias Current DC Output Offset Voltage PO = 6W THD = 0.5%, Note 1 Test Conditions Min - - 7.5 - 10 10 - Typ 16 - 16 50 12 15 - Max 20 2.2 20 - - - 0.2 Unit V A
Operating Mode (Symmetrical Power Supply, VCC = 16V, RL = 8, TA = +25C, f = 1kHz) Supply Voltage Range Total Quiescent Current Output Power V mA W W %
20Hz to 20kHz 29 - 14 40 46 - - 2 - - - 35 - 30 70 20 60 70 0.3 20 31 140 26 - - - 200 5.8 - 1.8 140 - 200 dB V k dB dB A mV
Input Mute Mode (Symmetrical Power Supply, VCC = 4V, RL = 8, TA = +25C, f = 1kHz) Supply Voltage Total Quiescent Current Output Voltage Noise Output Voltage Ripple Rejection DC Output Offset Voltage - 30 - 70 - 20 V mA mV V dB mV
VNO(RMS) RS = 2k, unweighted (20Hz to 2okHz)
Operating Mode (Asymmetrical Power Supply, VCC = 4V, RL = 8, TA = +25C, f = 1kHz) Total Quiescent Current Output Power Without RL THD = 0.5% THD = 10% Total Harmonic Distortion Power Bandwidth Voltage Gain Gain Balance Noise Output Voltage Input Impedance Ripple Rejection Channel Separation PO = 4W THD = 0.5%, Note 1 - 5 5 - 50 6 8.5 - - - - 0.2 mA W W %
40Hz to 20kHz 29 - - 14 40 40 30 0.2 70 20 50 - 31 - 140 26 - - dB dB V k dB dB
Note 1. Power Bandwidth at PO(MAX) = -3dB. Note 2. Ripple Rejection at RS = 0, f = 100Hz to 20kHz; ripple voltage = 200mV (RMS value) applied to positive or negative supply rail.
Pin Connection Diagram (Front View)
1 Non-Inverting Input 1 2 Inverting Input 1 3 GND 4 Output 1 5 -VCC 6 Output 2 7 +VCC 8 Inverting Input 2 9 Non-Inverting Input 2
.961 (24.4) .780 (19.8) .185 (4.7)
.489 (12.4) .079 (2.0)
9
1
.674 (17.0)
.079 (2.0)
.100 (2.54)

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