AN7191NZ PANASONIC
Document overview
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Technical content
Dual 20 W BTL audio power amplifier n Overview The AN7191NZ is an audio power IC developed for the sound output of car audio (dual 20 W). It is incorpo- rating various protective circuits to protect the IC from destruction by GND-open short circuit to GND and power supply surge which are the important subject of power IC protection, so the IC will largely contribute to a high reliability design of equipment. Also, it is incorporating a perfect muting circuit which is free from shock noise, so that a shock noise design under the set transient con- dition can be made easily using together with its standby function. n Features
- BTL 20 W · 2-channel (4 W ), GV = 34 dB
- Built-in various protection circuits (thermal protection, short circuit to VCC and short circuit to GND, VCC -open short circuit to VCC , GND-open short circuit to GND, overvoltage and supply surge, and ASO, etc.) Especially, the supply surge breakdown voltage is 100 V or more. GND open breakdown voltage is 16 V or more.
- Built-in standby function (free from shock noise at standby on/off)
- Built-in muting function Free from shock noise at mute-on/off. Adapting attenuator method so that abnormal sound due to waveform deformation is not generated. Attack time, recovery time are 50 ms or less.
- Reduction in external components It eliminates the need for NF and BS electrolytic ca- pacitors. Muting function is not required, and power supply choke coil is unnecessary.
- Provided with beep sound input pin
- 2 W load guaranteed n Applications
- Car audio HZIP015-P-0745A Unit : mm 18.00±0.30 13.50±0.30 f3.60±0.10 10.0±0.30 11 5 4.00±0.20 1.50±0.10 0.50+0.20 –0.10 (0.61) (2.54) 0.25+0.15 –0.05 R0.55 3.25±0.10 13.25±0.30 18.95±0.50 15.65±0.50 1.27 (1.80) (1.95) 19.00±0.30 19.30±0.30 2.40±0.50
AN7191NZ ICs for Audio Common Use n Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage *2 V CC 25 V Peak supply voltage *3 V surge 80 V Supply current I CC 9.0 A Power dissipation *4 PD 59 W Operating ambient temperature *1 Topr -30 to +85 °C Storage temperature *1 Tstg -55 to +150 °C n Block Diagram Note) *1: T a = 25°C except power dissipation, operating ambient temperature and storage temperature. *2 : Without signal *3 : Time = 0.2 s *4: T a = 85°C Ref. Protection cct. Att.con. Att. Att. Att. Att.
1 V CC
8GND (sub) GND (input) Beep in Ch.1 in Ch.2 in Standby Mute Ch.1 GND Ch.2 GND Ch.1 out (-) Ch.1 out (+) Ch.2 out (-) Ch.2 out (+) n Pin Descriptions Pin No. Description
1 Power supply
2 Ch.1 output ( +) 3 Grounding (output ch.1) 4 Ch.1 output ( -)
5 Standby
6 Ch.1 input
7 Muting
8 Grounding (sub)
Pin No. Description
9 Grounding (input)
10 Beep sound input
11 Ch.2 input
12 Ripple filter
13 Ch.2 output ( -) 14 Grounding (output ch.2) 15 Ch.2 output ( +)
ICs for Audio Common Use AN7191NZ n Electrical Characteristics at VCC = 13.2 V, freq. = 1 kHz, Ta = 25°C n Recommended Operating Range Parameter Symbol Range Unit Supply voltage V CC 8.0 to 18.0 V Parameter Symbol Conditions Min Typ Max Unit Quiescent current I CQ V IN = 0 mV, RL = 4 W¾ 120 250 mA Standby current I STB V IN = 0 mV, RL = 4 W¾ 11 0 mA Output noise voltage *1 V NO R g = 4.7 kW , RL = 4 W¾ 0.22 0.5 mV[rms] Voltage gain 1 G V1 V IN = 40 mV, RL = 4 W 32 34 36 dB Total harmonic distortion 1 THD1 Po = 0.5 W, RL = 4 W¾ 0.07 0.4 % Maximum output power 1 P O1 THD = 10% , RL = 4 W 16 18 ¾ W Ripple rejection ratio *1 RR R L = 4 W, R g = 4.7 kW, V r = 1 V[rms], 60 72 ¾ dB fr = 1 kHz Channel balance CB V IN = 40 mV, R L = 4 W¾ 01 d B Cross-talk *1 CT V IN = 40 mV, R L = 4 W, R g = 4.7 kW 55 65 ¾ dB Output offset voltage V OFF R g = 4.7 kW, R L = 4 W- 250 0 250 mV Muting effect *1 MT V IN = 40 mV, R L = 4 W 70 82 ¾ dB Input impedance Z i V IN = – 0.3 VDC 22 28 35 k W Voltage gain 2 G V2 V IN = 40 mV, R L = 2 W 32 34 36 dB Total harmonic distortion 2 THD2 Po = 0.5 W, RL = 2 W¾ 0.1 0.5 % Maximum output power 2 P O2 THD = 10% , RL = 2 W 16 24 ¾ W Shock noise *2 V S R L = 4 W, R g = 4.7 kW, V MUTE = 5 V, - 100 0 100 mV [p-0] V STB = on/off, 50Hz HPF-on Total harmonics distortion 3 THD3 V IN = 10 mV, fIN = 20 kHz, R g = 4.7 kW, ¾ 0.10 0.5 % R L = ¥ Note) *1 : Measurement using a bandwidth 15 Hz to 30 kHz (12 dB/OCT) filter. *2 : For VSTB = on/off, change over the standby terminal by the voltages of 0 V and 5 V at the time shown in the right. Standby terminal voltage 5 V 0 V 120 ms 120 ms
AN7191NZ ICs for Audio Common Use Pin No. Equivalent circuit Description DC voltage 1 ¾ Power supply connection pin 13.2 V 2 Ch.1 output pin ( +) : 6.6 V Ch.1 positive-phase output pin. 3 ¾ GND (Output) : 0 V Grounding pin for ch.1 output. 4 Ch.1 output pin ( -) : 6.6 V Ch.1 reverse-phase output pin.
5 Standby control pin : ¾
Standby changeover pin threshold voltage approx. 2.1 V. 6 Ch.1 input pin : 0 mV to Ch.1 input signal applied pin input 10 mV impedance 30 kW .
7 Mute control pin : ¾
Mute changeover pin threshold volt- age approx. 2.0 V. n Terminal Equivalent Circuits 30 kW 1.2 kW Pre-amp. Drive circuit Drive circuit V REF = 6.6 V 30 kW 1.2 kW Pre-amp. V REF = 6.6 V Drive circuit Drive circuit 900 W 10 kW Approx. 15 mA Approx. 15 mA 200 W 30 kW 400 W 5 kW
ICs for Audio Common Use AN7191NZ Pin No. Equivalent circuit Description DC voltage 8 ¾ GND (sub) : 0 V Being connected to substrate only. 9 ¾ GND (input) : 0 V Ground pin for input. 10 Beep sound input pin : 2.1 V Beep sound signal input pin. Input impedance 10 kW . 11 Ch.2 input pin : 1 mV to Ch.2 input signal applied pin. 10 mV Input impedance 30 kW . 12 Ripple filter pin : 13.0 V Output current 3 mA to 10 mA. 13 Ch.2 output pin ( -) : 6.6 V Ch.2 reverse-phase output pin. 14 ¾ GND (output) : 0 V Ground pin for ch.2 output. n Terminal Equivalent Circuits (continued) 1.2 kW 20 kW 1.2 kW 30 kW 1.2 kW 20 kW 1.2 kW 30 kW V REF = 2.1 V V REF = 2.1 V Approx. 15 mA Approx. 15 mA 200 W 30 kW 400 W 40 kW 30 kW 1.2 mA 200 mA V CC 30 kW 1.2 kW Pre-amp. V REF = 6.6 V Drive circuit Drive circuit
AN7191NZ ICs for Audio Common Use Pin No. Equivalent circuit Description DC voltage 15 Ch.2 output pin ( +) : 6.6 V Ch.2 positive-phase output pin. n Terminal Equivalent Circuits (continued) 30 kW 1.2 kW Pre-amp. V REF = 6.6 V Drive circuit Drive circuit n Usage Notes 1. Always attach an outside heat sink when using the chip. Note that, the outside heat sink must be fastened onto a chassis for use. 2. Connect the cooling fin to GND potential. 3. Avoid short circuit to VCC and short circuit to GND, and load short-circuit. 4. The temperature protection circuit will be actuated at 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 its operation at VCC = approx. 20 V. 6. Take into consideration the heat radiation design particularly when VCC is set high or when the load is 2 W . 7. When the beep sound function is not used, open the beep sound input pin (pin 10) or connect it to pin 9 with around 0.01 mF capacitor. 8. Connect only pin 9 (ground, signal source) to the signal GND of the amplifier in the previous stage. The character- istics such as distortion, etc. will improve. n Technical Information
- PD ¾ Ta curves of HZIP015-P-0745A PD ¾ Ta 120 113.6 100 59.5 40.3 30.5 20.5 11.3 1.8 0 25 50 75 100 125 150 Ambient temperature Ta (°C) Power dissipation PD (W) Infinit heat sink 1°C/W heat sink 2°C/W heat sink 3°C/W heat sink 5°C/W heat sink 10°C/W heat sink Without heat sink R th (j-c) = 1.1°C/W Pth (j-a) = 68.3°C/W
ICs for Audio Common Use AN7191NZ n Technical Information (continued) [1] Main characteristics PO ¾ VCC PC , ICC ¾ PO PO , THD ¾ VIN (RL = 4 W )P O , THD ¾ VIN (RL = 2 W ) G V , PO ¾ freq. THD ¾ freq. 0 5 10 15 20 25 Supply voltage VCC (V) Output voltage PO (W) R L = 4 W freq. = 1 kHz THD = 10% 0 5 10 15 20 25 30 Output voltage PO (W) Consumption power PC (W) Supply current ICC (A) V CC = 13.2 V R L = 4 W freq. = 1 kHz ICC PC 100 0.5 0.2 0.1 0.01 0.02 0.05 0.1 0.2 0.5 11 0 100 1 000 Input voltage VIN (mV) Output power PO (W) Total harmonic distortion THD (% ) V CC = 13.2 V R L = 4 W freq. = 1 kHz
400 Hz HPF
0.5 0.2 0.1 0.01 0.05 0.2 0.1 0.5 0.02 1 10 100 1 000 Input voltage VIN (mV) Output power PO (W) Total harmonic distortion THD (% ) V CC = 13.2 V R L = 2 W freq. = 1 kHz P O THD 100 Hz 1 kHz - 1 - 2 - 3 - 4 10 100 1k 10k 100k Frequency freq. (Hz) V oltage gain GV (dB) Maximum output power PO (W) V CC = 13.2 V R L = 4 W PO = 1 W THD = 10 % PO G V 34 dB 0.1 0.2 0.5 0.01 0.02 0.05 10 100 1k 10k 100k Frequency freq. (Hz) Total harmonic distortion THD (% ) V CC = 13.2 V R L = 2 W, 4 W PO = 1 W
AN7191NZ ICs for Audio Common Use n Technical Information (continued) [1] Main characteristics (continued) G V ¾ VCC THD ¾ VCC V NO ¾ Rg V NO ¾ VCC RR ¾ Vr RR ¾ fr - 4 - 3 - 2 - 1 0 5 10 15 20 25 Supply voltage VCC (V) V oltage gain GV (dB) V CC = 13.2 V R L = 4 W freq. = 1 kHz 0.5 0.1 0.2 0.05 0.02 0.01 0 5 10 15 20 25 Supply voltage VCC (V) Total harmonic distortion THD (% ) V CC = 13.2 V R L = 4 W freq. = 1 kHz V IN = 20 mV 2.0 1.5 1.0 0.5 10 100 1k 10k 100k Input impedance Rg (W ) Output end noise voltage VNO (mV) V CC = 13.2 V R L = 4 W V IN = 0 mV Wide band DIN audio g 2.0 1.5 1.0 0.5 0 5 10 15 20 25 Supply voltage VCC (V) Output end noise voltage VNO (mV) R L = 4 W V IN = 0 mV R g = 4.7 kW Wide band DIN audio 0 1 10 100 1 000 10 000 Power supply ripple voltage Vr (mV[rms]) Ripple rejection ratio RR (dB) V CC = 13.2 V R L = 4 W V IN = 0 mV R g = 0 W fr = 120 Hz DIN audio filter 10 100 1k 10k Power supply ripple frequency fr (Hz) Ripple rejection ratio RR (dB) V CC = 13.2 V R L = 4 W V IN = 0 mV R g = 0 W V r = 1 V[rms] DIN audio filter
ICs for Audio Common Use AN7191NZ n Technical Information (continued) [1] Main characteristics (continued) RR ¾ VCC CT ¾ VIN CT ¾ freq. CT ¾ VCC ICQ ¾ VCC ISTB ¾ VCC 051 0 1 5 2 02 5 Supply voltage VCC (V) Ripple rejection ratio RR (dB) R L = 4 W V IN = 0 mV R g = 0 W fr = 120 Hz V r = 1 V[rms] DIN audio filter 1 10 100 1 000 Input voltage VIN (mV) Cross-talk CT (dB) V CC = 13.2 V R L = 4 W freq. = 1 kHz R g = 4.7 kW DIN audio filter 10 100 1k 10k Frequency freq. (Hz) Cross-talk CT (dB) V CC = 13.2 V R L = 4 W R g = 4.7 kW DIN audio Filter 0 0 5 10 15 20 25 Supply voltage VCC (V) Cross-talk CT (dB) ch.2 fi ch.1 ch.2 fi ch.1 R L = 4 W V IN = 20 mV R g = 4.7 kW fr = 1 kHz DIN audio filter 200 150 100 0 5 10 15 20 25 Supply voltage VCC (V) Quiescent circuit current ICQ (mA) V IN = 0 mV R g = 0 W R L = 4 W 0 5 10 15 20 25 Supply voltage VCC (V) Standby current ISTB (mA) V IN = 0 mV R g = 0 W R L = 4 W ISTB
AN7191NZ ICs for Audio Common Use n Technical Information (continued) [1] Main characteristics (continued) ICQ ¾ VSTB V OFFSET ¾ VCC ME ¾ VIN ME ¾ freq. ME ¾ VCC ME ¾ VMUTE 200 150 100 012345 Standby terminal voltage VSTB (V) Quiescent circuit current ICQ (mA) V CC = 13.2 V V IN = 0 mV R g = 0 W R L = 4 W - 200 - 300 - 100 100 200 100 0 5 10 15 20 25 Supply voltage VCC (V) Output offset voltage VOFFSET (mV) V IN = 0 mV R g = 0 W R L = 4 W 110 100 11 0 100 1k 10k Input voltage VIN (mV[rms]) Muting effect ME (dB) V CC = 13.2 V R L = 4 W R g = 4.7 kW freq. = 1 kHz DIN audio filter 100 10 100 1k 10k 100k Frequency freq. (Hz) Muting effect ME (dB) V CC = 13.2 V R L = 4 W R g = 4.7 kW PO = 1 W DIN audio filter 100 0 5 10 15 20 25 Supply voltage VCC (V) Muting effect ME (dB) R L = 4 W R g = 4.7 kW freq. = 1 kHz PO = 1 W DIN audio filter 100 0123 4 5 Mute terminal voltage VMUTE (V) Muting effect ME (dB) 4.7 kW 10 mF 7 B A A B R L = 4 W R g = 4.7 kW freq. = 1 kHz PO = 1 W DIN audio filter
ICs for Audio Common Use AN7191NZ n Technical Information (continued) [2] Application note 1. Standby function 1) The power can be turned on or off by making pin 5 (standby terminal) high or low. 2) The standby terminal has threshold voltage of approx. 2.1 V, however, it has temperature de- pendency of approx. - 6 mV/°C. The recom- mended range of use is shown in table 1. 3) The internal circuit of standby terminal is as shown in figure 1. When the standby terminal is high, the current approximately expressed by the following equation will flow into the circuit. I STB = V STB -2.7 V [mA]10 kW 4) A power supply with no ripple component should be used for the control voltage of standby terminal. 2. Oscillation countermeasures 1) In order to increase the oscillation allowance, connect a capacitor and a resistor in series between each output terminal and GND as shown in figure 2. 2) The use of polyester film capacitor having a little fluctuation with temperature and frequency is recom- mended as the 0.22 mF capacitor for oscillation prevention. Terminal state Terminal voltagePower Open 0 V Standby state Low 0 V to 1.0 V Standby state High Higher than 3 V Operating state Table 1 3.5 kW 3.5 kW 3.5 kW 3.5 kW 10 kW5 V 0 V
5 RF Protection
2.2 W 0.22 mF 2,4 13,15 3,14 Figure 2 To speaker
AN7191NZ ICs for Audio Common Use n Technical Information (continued) [2] Application note (continued) 3. Input terminal 1) The reference voltage of input terminal is 0 V. When the input signal has a reference voltage other than 0 V potential, connect a coupling capacitor (of about several mF) for DC component cut in series with the input terminal. Check the low-pass frequency characteristics to determine the capacitance value. 2) 10 kW or less of signal source impedance Rg can reduce the output noise voltage. 3) The output offset voltage fluctuates when the signal source impedance Rg is changed. A care must be taken when using the circuit by directly connecting the volume to the input terminal. In such a case, the use of coupling capacitor is recommended. 4) If a high frequency signal from tuners enters the input terminal as noise, insert a capacitor of approx. 0.01 mF between the input terminal and input GND. When a high frequency signal is inputted, malfunction of protective circuits may occur. 4. Ripple filter 1) In order to suppress the fluctuation of supply voltage, connect a capacitor of approx. 33 mF between RF terminal (pin 12) and GND. 2) Relation between RR (ripple rejection ratio) and a capacitor The larger the capacitance of a ripple filter is, the better the ripple rejection becomes. 3) Relation between the rise time of circuit and a capacitor The larger the capacitance of a ripple filter is, the longer the time from the power-on (standby : high) to the sound release becomes. 4) The DC voltage of output terminal is approximately the middle point of the ripple filter terminal voltage. 5) The internal circuit of ripple filter terminal is as shown in figure 4 and the charge current is approx. 3 mA to 10 mA. 4.7 kW 30 kW 200 W6 400 W mA 0.01 mF 1 mF mA Attenuator To power Input signal Figure 3
AN7191NZ ICs for Audio Common Use n Technical Information (continued) [2] Application note (continued) 7. Shock noise 1) STB on/off No shock noise is released. However, the changeover switch of the standby terminal may make a slight shock noise. In such a case, insert a capacitor of approx. 0.01 mF between the standby terminal and GND. 2) Mute on/off No shock noise is released. Refer to the section on the mute function. 8. Mute function 1) The mute-on/off is possible by making pin 7 (the muting terminal) high or low. 2) The muting circuit is as shown in figure 6. The amplifier gain including attenuator block is given in the following equation : G V = I1 · 50I2 Original gain From the above equation, the amplifier gain can be made as 0 time by setting I1 at 0 mA in muting. 3) The threshold voltage of VMUTE is as follows : Mute-off : Approx. 1 V or less Mute-on : Approx. 3 V or less 4) Attack time and recovery time can be changed by the external CR of pin 7. For recommended circuits (figure 7. 4.7kW , 10 mF), the above mentioned times are as follows : Attack time : Approx. 30 ms Recovery time : Approx. 40 ms However, the control voltage of VMUTE is assumed to be 5 V. When it is not directly controlled by microcomputer (5 V), (13.2 V separate power supply), it is necessary to change CR values because the above times change. 5) When the attack time and recovery time are set at 20 ms or less, pay attention to the IC with larger output offset because it may release the shock noise. 9. Voltage gain The voltage gain is fixed at 34 dB and can not be changed by the addition of an external resistor. 5 kW 74.7 kW5 V 0 V 10 mF I2I1 I2I1 I1 = approx. 120 mA I2 = approx. 120 mA Output stageInput Output stage Attenuator block V MUTE Mute/Off Mute/On g Figure 6
AN7191NZ ICs for Audio Common Use n Technical Information (continued) [2] Application note (continued) 11. Two IC use (continued) 1) Supply terminal Short-circuiting each other, insert an electrolytic capacitor of approx. 2 200 mF into the supply terminals. However, if sufficient characteristics of the ripple rejection can not be obtained, use an even larger capacitor or insert a 2 200 mF capacitor into each IC. The best sound quality can be obtained by inserting a 2 200 mF capacitor near the terminal of each IC. 2) Standby terminal (pin 5) The connection of standby terminals with each other does not result in an abnormal operation. Connect with the microcomputer after connecting the standby pins with each other. At that time, the current flowing into the standby terminal is twice larger the current which is described in 1. Standby function. 3) Muting terminal (pin 7) It does not result in the abnormal operation even if the muting terminals are short-circuited with each other. The muting time constant changes when two ICs connection is made. If the CR constants are set at twice and 1/2 time respectively, the time constant value becomes as same as the value when 1 IC is used. 4) Beep sound input terminal (pin 10) Short-circuit between the beep sound input terminals does not result in an abnormal operation. However, if there is a temperature difference between ICs, there may be a fluctuation of the output offset. In order to avoid such a phenomenon, connect the ICs with each other through a resistor (47 kW ). 5) Ripple filter terminal (pin 12) Short-circuit between ripple filter terminals does not result in an abnormal operation. However, if the standby of each IC is individually controlled, the short-circuiting is not allowed. Use the circuit after connecting a capacitor (33 mF) to each IC. n Application Circuit Example Beep in Ch.1 in Ch.2 in Ripple filter Standby Muting Ch.1 GND Ch.2 GND Ch.1 out (-) Ch.1 out (+) Ch.2 out (-) Ch.2 out (+) V CC