NTE1851 Integrated Circuit Audio Amplifier, 24W BTL Description: The NTE1851 is a monolithic integrated class–B amplifier in a 13–Lead Staggered SIP type package primarily developed for car radio applications, and also to drive low–impedance loads (down to 1.6Ω). At a supply voltage VCC = 14.4V, an output power of 21W can be delivered into a 4Ω BTL (Bridge–Tied Load), or, when used as a stereo amplifier, it delivers 2 x 11W into 2Ω or 2 x 6.5W into 4Ω. Features: D Flexibility In Use – Mono BTL as well as Stereo D D High Output Power D D Low Offset Voltage at the Output D (Important for BTL) D Large Usable Gain Variation D D Very Good Ripple Rejection D D Internal Limited Bandwidth for High Frequencies D D Low Standby Current Possiblity (1µA Typ), to Simplify Required Switches: TTL Drive Possible D D Low Number of Small–Sized External Compo- D nents High Reliability Load Dump Protection AC and DC Short–Circuit Safe to Ground up to VCC = 18V Thermal Protection Speaker Protection in Bridge Configuration SOAR Protection Outputs Short–Circuit Safe to Ground in BTL Reverse–Polarity Safe Applications: D Car Radio Applications D Drive Low Impedance Loads D Stereo Amplifier Absolute Maximum Ratings: Supply Voltage (Pin10), VCC Operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V Non–Operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28V Supply Voltage (During 50ms Load Dump Protection), VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45V Peak Output Current, IOM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8A Crystal Temperature, TC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C AC and DC Short–Circuit Safe Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V Reverse Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10V DC Electrical Characteristics: Parameter Symbol Test Conditions Min Typ Max Unit Supply Voltage Range (Pin10) VCC 6 – 18 V Repetitive Peak Output Current IORM – – 4 A Total Quiescent Current ITOT – 75 75 mA Switching Level 11 OFF V11 – – 1.8 3.0 – – V 100 – – kΩ V ON Impedance Between Pin10 & Pin6; Pin10 & Pin8 |ZOFF| Standby Position V11 < 1.8V Standby Current ISB V11 = 0 to 0.8V – 1 100 µA Switch–On Current (Pin11) ISO V11 ≤ V10 – 10 100 µA AC Electrical Characteristics: (TA = +25°C, VCC = 14.4V, f = 1kHz unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit VCC = 14.4V, dTOT = 0.5% 15.5 18.0 – W VCC = 14.4V, dTOT = 10% 20 24 – W VCC = 13.2V, dTOT = 0.5% – 15 – W VCC = 13.2V, dTOT = 10% – 20 – W – 75 – dB – 40 – dB VCC = 14.4V, dTOT = 0.5% – 12 12 W VCC = 14.4V, dTOT = 10% – 15 15 W VCC = 13.2V, dTOT = 0.5% – 9 9 W VCC = 13.2V, dTOT = 10% – 12 12 W Bridge–Tied Load Application (BTL) Output Power with Bootstrap PO RL = 4Ω Open–Loop Voltage Gain GO Closed–Loop Voltage Gain GC Note 2 Output Power without Bootstrap PO Note 3 Frequency Response at –3dB Input Impedance Noise Input Voltage (RMS Value) B Note 4 20 – 20 Hz |Zi| Note 5 1 – – MΩ – 0.2 0.2 mV – 0.35 0.35 mV – 0.25 0.8 mV 42 50 50 dB VN(RMS) RS = 0Ω f = 20Hz to 20kHz RS = 10kΩ VN Supply Voltage Ripple Rejection RR f = 100Hz DC Output Offset Voltage Between the Outputs |∆V5–9| – 2 50 mV Loudspeaker Protection (All Conditions) Maximum DC Voltage (Across the Load) |∆V5–9| – – 1 V 30 – 40 kHz Power Bandwidth B –1dB, dTOT = 0.5% Note 1. The internal circuit impedance at Pin11 is > 5kΩ if V11 > V10. Note 2. Closed–Loop voltage gain can be chosen between 32 and 56dB (BTL), and is determined by external components. Note 3. Without the bootstrap the 100µF capacitor between Pin5 and Pin6 (Pin8 and Pin9) can be omitted. Pin6, Pin8, and Pin10 have to be interconnected. Note 4. Frequency response externally fixed. Note 5. The input impedance in the test circuit is typically 100kΩ. AC Electrical Characteristics (Cont’d): (TA = +25°C, VCC = 14.4V, f = 1kHz unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit VCC = 14.4V, RL = 4Ω 6 7 – W VCC = 14.4V, RL = 2Ω 10 12 – W VCC = 13.2V, RL = 4Ω – 6 – W VCC = 13.2V, RL = 4Ω – 10 – W dTOT = 0.5% VCC = 14.4V, RL = 4Ω Note 6 VCC = 14.4V, RL = 2Ω – 5.5 – W – 9.0 – W VCC = 13.2V, RL = 4Ω – 4.5 – W VCC = 13.2V, RL = 4Ω – 7.5 – W dTOT = 10%, VCC = 14.4V, RL = 4Ω, Note 3, Note 6, & Note 7 – 6 – W B Note 4 40 – 20 kHz RR Note 8 – 50 – dB RS = 10kΩ, f = 1kHz 40 50 – dB Note 9 – 40 – dB – 0.15 – mV – 0.25 – mV – 0.2 – mV Stereo Application Output Power with Bootstrap Output Power with Bootstrap Output Power without Bootstrap Frequency Response at –3dB Supply Voltage Ripple Rejection Channel Separation Closed–Loop Voltage Gain Noise Input Voltage (RMS Value) PO PO PO α GC dTOT = 10% Note 6 VN(RMS) RS = 0Ω RS = 10kΩ VN f = 20Hz to 20kHz Note 1. The internal circuit impedance at Pin11 is > 5kΩ if V11 > V10. Note 2. Closed–Loop voltage gain can be chosen between 32 and 56dB (BTL), and is determined by external components. Note 3. Without the bootstrap the 100µF capacitor between Pin5 and Pin6 (Pin8 and Pin9) can be omitted. Pin6, Pin8, and Pin10 have to be interconnected. Note 4. Frequency response externally fixed. Note 5. The input impedance in the test circuit is typically 100kΩ. Note 6. Output power is measured directly at the output pins of the IC. Note 7. A resistor of 56kΩ between Pin3 and Pin7 to reach symmetrical clipping. Note 8. Supply voltage ripple rejection measured with a source impedance of 0Ω (Maximum ripple amplitude: 2V). Note 9. Closed–Loop voltage gain can be chosen between 26 and 50dB (Stereo), and is determined by external components. Pin Connection Diagram (Front View) 13 Inverting Input 2 12 Non–Inverting Input 2 11 Standby Switching 10 VCC 9 Output 2 8 Bootstrap 2 7 GND/Substrate 6 Bootstrap 1 5 Output 1 4 Loudspeaker Protection 3 Supply Voltage Ripple Rejection 2 Non–Inverting Input 1 1 Inverting Input 1 .961 (24.4) .185 (4.7) .128 (3.28) 1 .488 (12.4) .669 (17.0) 13 .630 (16.0) .067 (1.7) .200 (5.08) .170 (4.32)