AN7555

ICs for Audio Common Use AN7555NZ BTL output power IC for car audio s Overview The AN7555NZ is an audio power IC developed as the sound output of car audio (35 W × 4-channel). It has realized the voltage gain of 40 dB based on the AN7560Z (voltage gain: 34 dB). A capacitor and resistor to stop oscillation are built in between the output pin and GND so that a space saving of set is possible. Also, it incorporates a perfect muting circuit without shock noise, so that a shock noise design under the set transient condition can be made easily when used together with its standby function. In addition, it incorporates various protection circuits to protect the IC from destruction by GND-open short circuit to ground, and power supply surge which are the important subject of power IC protection. This IC will largely contribute to a high reliability design of the equipment. 31.0±0.3 27.0±0.3 21.0±0.1 (10.50) (10.50) 3.6±0.1 Unit: mm 4.5±0.2 φ3.6±0.1 1.5±0.1 3.75±0.10 14.5±0.3 15.5±0.3 (1.26) 1.27 0.6 +0.2 –0.1 (5.08) (4.29) 0.40 +0.15 –0.05 (2.15) Seating plane HZIP025-P-0980 s Features • A pattern layout in which input and output pattern do not intersect each other on single-sided printed circuit board is possible. • Incorporating various protection circuits (temperature protection, short circuit to VCC , VCC-open short circuit to VCC , short circuit to GND, GND-open short circuit to GND, overvoltage, power supply surge, and ASO, etc.) • Built-in standby function (shock-noise free at STB-on/ off) • Built-in muting function (shock-noise free at Mute-on/ off) • External components reduction • Provided with beep sound input pin • Equipped with auxiliary sound input pin • Voltage gain: 40 dB (AN7560Z/AN7561Z: Voltage gain: 34 dB) s Applications • Car stereo, miniature audio component, karaoke and other audio equipment (1.95) 33.0±0.3 33.36±0.30 (3.30) (5.70) 1 25 2.4±0.5 18.75±0.30 (24.45) R1.8±0.1 1 AN7555NZ s Block Diagram VCC VCC ICs for Audio Common Use 21 4 12 19 25 1 2 GND (output) 3 Ripple filter Protection circuit Beep input 16 9 8 GND (output) 11 5 6 GND (output) 7 Attenuator Attenuation control AUX input Attenuator 13 14 GND (output) 15 24 23 20 18 10 17 GND (input) s Pin Descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 Description Ch.4 + output GND (ch.4 output) Ch.4 − output Supply voltage VCC Ch.3 + output GND (ch.3 output) Ch.3 − output GND (ch.3 output) Ch.2 + output AUX input Ch.2 − output Supply voltage Vcc Ch.1 + output Pin No. 14 15 16 17 18 19 20 21 22 23 24 25 Description GND (ch.1 output) Ch.1 − output Standby Ch.1 input Beep input Ch.2 input GND (input) Ch.4 input GND (printed circuit board) Ch.3 input Muting Ripple filter Note) It is not necessary to connect capacitor and resistor for stopping the oscillation at the output terminals. Use them after check if necessary for noise countermeasure. 2 GND (sub) Beep Muting AUX 22 ICs for Audio Common Use s Absolute Maximum Ratings Parameter Supply voltage *2 *3 AN7555NZ Symbol VCC Vsurge ICC Rating 25 65 12 59 −30 to +85 −55 to +150 Unit V V A W °C °C Peak supply voltage Supply current Power dissipation *4 PD *1 Operating ambient temperature Storage temperature Note) *1 : *2 : *3 : *4 : *1 Topr Tstg Ta = 25°C except operating ambient temperature and storage temperature. Without signal Time = 0.2 s Power dissipation at Ta = 85°C s Recommended Operating Range Parameter Supply voltage Symbol VCC Range 8.0 to 18.0 Unit V s Electrical Characteristics at VCC = 13.2 V, f = 1 kHz, Ta = 25°C Parameter Quiescent current Standby current Output noise voltage Voltage gain Total harmonic distortion 1 Maximum output power Ripple rejection Channel balance Cross-talk Output offset voltage Muting effect *1 *1 *1 Symbol ICQ ISTB VNO GV THD1 PO RR CB CT VOFF MT ZI VS Conditions Rg = 10 kΩ, RL = 4 Ω Rg = 10 kΩ, RL = 4 Ω Rg = 10 kΩ, RL = 4 Ω VIN = 20 mV, RL = 4 Ω VIN = 20 mV, RL = 4 Ω THD = 10%, RL = 4 Ω RL = 4 Ω, Rg = 10 kΩ, VR = 1 V[rms], fR = 1 kHz VIN = 20 mV, RL = 4 Ω VIN = 20 mV, RL = 4 Ω, Rg = 10 kΩ Rg = 10 kΩ, RL = 4 Ω VIN = 20 mV, RL = 4 Ω VIN = ±0.3 VDC RL = 4 Ω, Rg = 10 kΩ, VMUTE = 5 V, VSTB = on/off, 50 Hz HPF Min    38  16 55  60 −300 70 24 −100 Typ 300 1 0.25 40 0.05 19.5 65 0 70 0 80 30 0 Max 450 10 0.5 42 0.2   1  300  36 Unit mA µA mV[rms] dB % W dB dB dB mV dB kΩ Input impedance Shock noise *2 100 mV[p-0] Note) *1 : Measurement using a bandwidth 15 Hz to 30 kHz (12 dB/OCT) filter. *2 : Change over the standby terminal at the time shown in the right. 5V Standby terminal voltage 0V 500 ms 500 ms 3 AN7555NZ ICs for Audio Common Use s Electrical Characteristics at VCC = 13.2 V, f = 1 kHz, Ta = 25°C (continued) Parameter Total harmonic distortion 2 Mute-on threshold voltage Mute-off threshold voltage Cutoff frequency Symbol THD2 MTON MTOFF fC Conditions VIN = 10 mV, fIN = 20 kHz, Rg = 10 Ω, RL = ∞ VIN = 20 mV, RL = 4 Ω VIN = 20 mV, RL = 4 Ω VIN = 20 mV, RL = 4 Ω, GV = −1 dB (0 dB: 1 kHz) Min  4  20 Typ 0.1   40 Max 0.5  0.8  Unit % V V kHz • Design reference data Note) The characteristic values below are theoretical values for designing and not guaranteed. Parameter Maximum output power Symbol POmax PO2 POmax2 Conditions Max. power, RL = 4 Ω VCC = 14.4 V, THD = 10%, RL = 4 Ω VCC = 14.4 V, max. power, RL = 4 Ω VCC = 14.4 V, THD = 1%, RL = 4 Ω, PoL = −3 dB (1 kHz: 0 dB) VCC = 14.4 V, THD = 1%, RL = 4 Ω, PoH = −3 dB (1 kHz: 0 dB) Rg = 10 kΩ, RL = 4 Ω, STB → ACT Rg = 10 kΩ, RL = 4 Ω, ACT → STB Min        Typ 28 21 34 10 18 2.2 1.5 Max        Unit W Power band width fPL fPH Hz kHz V STB threshold voltage VSTB1 VSTB2 s Usage Notes 1. Always attach an outside heat sink to use the AN7555NZ. In addition, the outside heat sink must be fastened onto a chassis for use. 2. Connect the radiation fin to the GND potential. 3. Prevent short circuit to VCC and short circuit to GND, and load short-circuit although the protection circuits for short circuit to VCC and ASO are built-in. 4. The thermal protection circuit gets actuated when Tj = approx. 150°C, but it is automatically reset when the chip temperature drops below the above set level. 5. The overvoltage protection circuit starts the protection operation at VCC = approx. 20 V. 6. Take into consideration the heat radiation design particularly when VCC is set high. 7. When the beep sound function is not used, connect to GND the beep sound input pin. 8. Don't down below − 0.3 V for the beep sound input pin. 9. When the AUX function is not used, open the AUX input pin. 10. Connect to signal GND of pre-stage amplifier only for the signal source ground. • There are the possibility of breakdown for the following conditions. 1. Reverse connection of the power supply pin and the GND pin. 2. Connection of the power supply between output pins at open condition of the power supply pin and the GND pin. 3. Short circuit to GND of output pin when the GND pin is open. 4. Short circuit to GND of above the three output pins at the same time with a shorting resistor which does not operate the protection circuit. 5. Short circuit to GND of above the plus and minus output pins at the same time with a shorting resistor which does not operate the protection circuit. 6. Short circuit to ground with shorting the RF pin and the output pin. 4 ICs for Audio Common Use s Technical Information • PD  Ta curves of HZIP025-P-0980 PD  T a 1.800 1.770 1.600 AN7555NZ 1.400 Mounted on standard board (grass epoxy : 50 mm × 50 mm × t0.08 mm) Rth (j−a) = 70.6 °C/W Power dissipation PD (W) 1.200 1.075 1.000 0.800 Independent IC without heat shink Rth( j−a) = 116.2°C/W 0.600 0.400 0.200 0.000 0 25 50 75 100 125 150 Ambient temperature Ta (°C) s Application Circuit Example 2 200 µF 1 µF 10 kΩ 10 kΩ VCC 21 12 19 4 1 µF 25 33 µF 4Ω 1 2 3 5 4Ω 6 7 16 9 8 11 13 14 15 4Ω 4Ω 23 20 18 24 10 17 10 kΩ 22 kΩ 1 µF 10 kΩ 1 µF 0V Muting Beep AUX 1 µF 5V 22 5