ICs for Audio Common Use AN7199Z Dual 20 W BTL power IC for car audio ■ Overview 3.25±0.10 Unit : mm 18.00±0.30 4.00±0.20 13.50±0.30 1.50±0.10 13.25±0.30 15 1.27 +0.20 0.50–0.10 15.65±0.50 2.40±0.50 1 18.95±0.50 φ3.60±0.10 10.0±0.30 The AN7199Z is an audio power IC developed for the sound output of car audio (dual 20 W). A capacitor and a resistor to stop oscillation are built in between the output pin and GND so that a space saving of set is possible. Also, it is incorporates an industry's first superior muting circuit which is free from shock noise, so that a shock noise design under the set transient condition can be made easily when the muting circuit is used together with its standby function. In addition, it is incorporating various protective circuits to protect the IC from destruction by GND-open short-circuit to GND and power supply surge which are the most important subjects of power IC protection, and the IC will largely contribute to a high reliability design of equipment. (0.61) (1.80) R0.55 (1.95) +0.15 0.25–0.05 (2.54) 19.00±0.30 19.30±0.30 HZIP015-P-0745A ■ Features • Built-in various protection circuits (realizing high breakdown voltage against destruction) Power supply surge breakdown voltage of 80 V or more Ground open breakdown voltage of 16 V or more • Built-in standby function (free from shock noise when STB-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 of 50 ms or less • Reduction in external components No CR for oscillation stop is required It eliminates the need for NF and BS electrolytic capacitors Muting function is unneccesary Power supply choke coil is unnecessary • Provided with beep sound input pin • High sound quality design ■ Applications • Car audio 1 ICs for Audio Common Use Ripple filter AN7199Z 1 12 VCC ■ Block Diagram 3 Ch.1 GND 14 Ref. 4 Ch.1 Out (−) 13 Protection Cct. Att. 15 Att.Con. Ch.2 Out (+) 9 11 GND(input) Ch.2 In 7 Att. Mute 5 Standby 6 Ch.1 In GND(sub) Beep In 8 10 Att. Ch.2 Out (−) Att. 2 Ch.1 Out (+) Ch.2 GND ■ Pin Descriptions Pin No. Description Pin No. Description 1 Power supply 9 Grounding (input) 2 Ch.1 output (+) 10 Beep sound input 3 Grounding (output ch.1) 11 Ch.2 input 4 Ch.1 output (−) 12 Ripple filter 5 Standby 13 Ch.2 output (−) 6 Ch.1 input 14 Grounding (output ch.2) 7 Muting 15 Ch.2 output (+) 8 Grounding (sub) ■ Absolute Maximum Ratings Parameter Supply voltage *2 Peak supply voltage *3 Supply current Power dissipation *4 Operating ambient temperature Storage temperature Note) *1 : *2 : *3 : *4 : 2 *1 *1 Symbol Rating Unit VCC 25 V Vsurge 60 V ICC 9.0 A PD 59 W Topr −30 to +85 °C Tstg −55 to +150 °C All items are at Ta = 25°C, except for the operating ambient temperature and storage temperature. Without signal Time = 0.2 s Ta = 85°C ICs for Audio Common Use AN7199Z ■ Recommended Operating Range Parameter Supply voltage Symbol Range Unit VCC 8.0 to 18.0 V ■ Electrical Characteristics at VCC = 13.2 V, f = 1 kHz, Ta = 25°C Parameter Symbol Conditions Min Typ Max Unit ICQ VIN = 0 mV, RL = 4 Ω 120 250 mA ISTB VIN = 0 mV, RL = 4 Ω 1 10 µA VNO Rg = 10 kΩ, RL = 4 Ω 0.18 0.5 mV[rms] GV1 VIN = 20 mV, RL = 4 Ω 38 40 42 dB Total harmonic distortion 1 THD1 VIN = 20 mV, RL = 4 Ω 0.07 0.4 % Maximum output power 1 PO1 THD = 10%, RL = 4 Ω 16 18.5 W VCC = 14.4 V, RL = 4 Ω 22.0 W RR RL = 4 Ω, Rg = 10 kΩ, Vr = 1 V[rms], fr = 1 kHz 55 60 dB CB VIN = 20 mV, RL = 4 Ω 0 1 dB CT VIN = 20 mV, RL = 4 Ω, Rg = 10 kΩ 60 79 dB VOff Rg = 10 kΩ, RL = 4 Ω −300 0 300 mV MT VO = 1 W, RL = 4 Ω 70 86 dB VIN = ± 0.3 VDC 24 30 36 kΩ GV2 VIN = 20 mV, RL = 2 Ω 38 40 42 dB Total harmonic distortion 2 THD2 VIN = 20 mV, RL = 2 Ω 0.12 0.5 % Maximum output power 2 PO2 THD = 10%, RL = 2 Ω 16 25 W VS RL = 4 Ω, Rg = 10 kΩ VSTB = on/off, 50 Hz HPF-on −100 0 100 mV[p-0] 0.10 Quiescent current Standby current Output noise voltage *1 Voltage gain 1 Ripple rejection ratio *1 Channel balance Cross-talk *1 Output offset voltage Muting effect *1 Input impedance Zi Voltage gain 2 Shock noise *2 Total harmonic distortion 3 THD3 VIN = 10 mV, fIN = 20 kHz Rg = 10 kΩ, RL = ∞ 0.5 % 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 below. Standby terminal voltage 5V 0V 500 ms 500 ms 3 AN7199Z ICs for Audio Common Use ■ Terminal Equivalent Circuits Pin No. Equivalent circuit 1 Description Supply voltage pin DC Voltage 13.2 V Supply connection pin 2 Ch.1 output pin (+) 1 Drive circuit 6.6 V Pre-amp. Ch.1 positive-phase output pin 2 Drive circuit 3 VREF = 6.3 V 15 kΩ AN7198Z : 600 Ω AN7199Z : 300 Ω 3 GND (output) 0V Grounding pin for ch.1 output 4 1 Drive circuit Pre-amp. Ch.1 output pin (−) 6.6 V Ch.1 inverted-phase output pin 4 Drive circuit 3 VREF = 6.3 V 15 kΩ AN7198Z : 600 Ω AN7199Z : 300 Ω 5 Standby control pin 5 10 kΩ Standby changeover pin Threshold voltage approx. 2.1 V 2 kΩ 6 Ch.1 input pin 6 200 Ω 30 kΩ 4 Approx. Approx. 15 µA 15 µA 600 Ω Ch.1 input signal applied pin Input impedance 30 kΩ 0 mV to10 mV ICs for Audio Common Use AN7199Z ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent circuit Description 7 Mute control pin 7 DC Voltage Mute changeover pin 200 Ω Threshold voltage approx. 2.1 V 8 GND (substrate) 0V Being connected with substrate only 9 GND (input) 0V Ground pin for input 10 Rnf VREF = 6.3 V Beep sound input pin 15 kΩ Rnf 2 Beep sound signal input pin Input impedance 15.3 kΩ 15 kΩ 7.8 kΩ 2.1 V 15 kΩ 10 Rnf VREF = 6.3 V Rnf 15 15 kΩ Rnf AN7198Z : 600Ω AN7199Z : 300Ω 11 Ch.2 input pin 0 mV to10 mV 11 Approx. Approx. 15 µA 15 µA 200 Ω 600 Ω Ch. 2 input signal applied pin Input impedance 30 kΩ 30 kΩ 12 Ripple filter pin 13.0 V VCC 15 kΩ 12 Output current 3 mA to 10 mA 350 µA 1.7 mA 20 kΩ 5 AN7199Z ICs for Audio Common Use ■ Terminal Equivalent Circuits (continued) Pin No. 13 Equivalent circuit 1 Drive circuit Description Pre-amp. Ch.2 output pin (−) DC Voltage 6.3 V Ch.2 inverted-phase output pin 13 Drive circuit 15 VREF = 6.3 V 15 kΩ AN7198Z : 600 Ω AN7199Z : 300 Ω 14 GND(output) 0V Grounding pin for ch.2 output 15 Ch.2 output pin (+) 1 Drive circuit 6.3 V Pre-amp. Ch.2 positive-phase output pin 14 Drive circuit 15 VREF = 6.3 V 15 kΩ AN7198Z : 600 Ω AN7199Z : 300 Ω ■ Usage Notes 1. Always attach an outside heat sink to use the chip. In addition, 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. There is a danger of destruction under a special condition. 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 Ω. 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 µF capacitor. 8. Connect only pin 9 (ground, signal source) to the signal GND of the amplifier in the previous stage. The characteristics such as distortion, etc. will be improved. 6 ICs for Audio Common Use AN7199Z ■ Technical Information [1] PD Ta curves of HZIP015-P-0745A PD T a 120 Infinity heat sink 113.6 Rth (j−c) = 1.1°C/W Rth (j−a) = 68.3°C/W Power dissipation PD (W) 100 80 1°C/W heat sink 60 59.5 2°C/W heat sink 40.3 40 3°C/W heat sink 30.5 5°C/W heat sink 20.5 20 10°C/W heat sink 11.3 Without heat sink 1.8 0 0 25 50 75 100 125 150 Ambient temperature Ta (°C) [2] Main characteristics PO VCC RL = 2 Ω 25 RL = 4 Ω 20 f = 1 kHz THD = 10% RL = 2 Ω, 4 Ω 400 Hz HPF 30 kHz LPF Both ch. input Rg = 10 kΩ 15 10 5 0 5 10 15 Supply voltage VCC (V) 20 25 5 ICC (RL = 2 Ω) 25 ICC (RL = 4 Ω) 4 20 PC (RL = 4 Ω) 3 VCC = 13.2 V f = 1 kHz 400 Hz HPF 30 kHz LPF Both ch. input Rg = 10 kΩ 2 15 10 5 0 0 5 10 15 Supply current ICC (A) 30 Consumption power PC (W) 30 35 Output voltage PO (W) 6 PC (RL = 2 Ω) 40 0 PC , ICC PO 35 45 1 0 20 Output power (1-ch.) PO (W) 7 AN7199Z ICs for Audio Common Use ■ Technical Information (continued) [2] Main characteristics (continued) PO, THD VIN (RL = 4 Ω) PO, THD VIN (RL = 2 Ω) 10.00 THD 100 Hz 1 kHz VCC = 13.2 V f = 1 kHz RL = 4 Ω 400 Hz HPF 30 kHz LPF Both ch. input Rg = 10 kΩ 1.00 0.10 1 1.00 10 0.10 0.01 1 000 100 10.00 THD 10 kHz Output power PO (W) PO THD 10 kHz 100.00 PO 10.00 THD 100 Hz 1 kHz VCC = 13.2 V f = 1 kHz RL = 2 Ω 400 Hz HPF 30 kHz LPF Both ch. input Rg = 10 kΩ 1.00 0.10 1 10 Input voltage VIN (mV[rms]) 26 PO (2 Ω) 24 32 22 30 20 PO (4 Ω) 28 18 26 16 VCC = 13.2 V 400 Hz HPF PO = 1 W 30 kHz LPF THD = 10% Both ch. input RL = 2 Ω, 4 Ω Rg = 10 kΩ 24 22 10 100 1 000 10 000 14 1.00 RL = 2 Ω RL = 4 Ω 12 10 100 000 0.01 10 100 Frequency f (Hz) 1 000 10 000 100 000 Frequency f (Hz) GV, THD VCC ICQ, ISTB VCC 200 10 4.5 180 9 160 8 4 GV (RL = 4 Ω, 2 Ω) 39 3.5 37 3 VIN = 40 mV[rms] f = 1 kHz 2.5 RL = 2 Ω, 4 Ω 400 Hz HPF 2 30 kHz LPF Both ch. input 1.5 Rg = 10 kΩ 1 35 33 31 29 27 25 0.5 THD (RL = 4 Ω, 2 Ω) 0 5 10 15 Supply voltage VCC (V) Quiescent current ICQ (mA) 5 43 Total harmonic distortion THD (%) 45 41 Voltage gain GV (dB) VCC = 13.2 V PO = 1 W RL = 2 Ω, 4 Ω 400 Hz HPF 30 kHz LPF Both ch. Input Rg = 10 kΩ 0.10 140 7 ICQ 120 6 100 5 80 4 60 3 RL = 4 Ω Both ch. input 2 Rg = 10 kΩ 1 40 20 ISTB 20 0 25 0 0 5 10 15 Supply voltage VCC (V) 20 0 25 Standby current ISTB (µA) 34 Total harmonic distortion THD (%) 28 Output power PO (W) Voltage gain GV (dB) 10.00 30 GV (2, 4 Ω) 36 8 0.01 1 000 100 THD f 38 20 0.10 Input power VIN (mV[rms]) G V, P O f 40 1.00 Total harmonic distortion THD (%) 10.00 Total harmonic distortion THD (%) Output power PO (W) 100.00 ICs for Audio Common Use AN7199Z ■ Technical Information (continued) [2] Main characteristics (continued) VNO VCC VNO Rg 1.0 RL = 4 Ω Rg = 10 kΩ Output noise voltage VNO (µV[rms]) Output noise voltage VNO (µV[rms]) 1.0 Flat 0.5 DIN Audio Filter 0.0 0 10 5 15 VCC = 13.2 V RL = 4 Ω Rg = 10 kΩ Flat 0.5 DIN Audio Filter 0.0 10 20 100 Supply voltage VCC (V) 1 000 10 000 100 000 Input impedance Rg (Ω) RR VCC RR Vr 90 70 80 60 70 ch.2 60 ch.1 50 RL = 4 Ω 400 Hz HPF 30 kHz LPF Rg = 10 kΩ fr = 1 kHz Vr = 1 V[rms] 40 30 20 0 10 5 15 20 Ripple rejection ratio RR (dB) Ripple rejection ratio RR (dB) ch.2 ch.1 50 40 30 VCC = 13.2 V RL = 4 Ω 400 Hz HPF 30 kHz LPF Rg = 10 kΩ fr = 1 kHz 20 10 0 25 1 Supply voltage VCC (V) 10 100 1 000 Power supply ripple voltage Vr (mV[rms]) RR fr CT VCC 70 80 PO = 1 W f = 1 kHz RL = 4 Ω 400 Hz HPF 30 kHz LPF Rg = 10 kΩ ch.1 79 ch.2 78 50 Cross-talk CT (dB) Ripple rejection ratio RR (dB) 60 40 30 20 VCC = 13.2 V RL = 4 Ω Rg = 10 kΩ fr = 1 kHz Vr = 1 V[rms] 10 0 10 77 76 75 74 ch.2 73 ch.1 72 71 70 100 10 000 1 000 Power supply ripple frequency fr (Hz) 10 000 0 5 10 15 20 25 Supply voltage VCC (V) 9 AN7199Z ICs for Audio Common Use ■ Technical Information (continued) [2] Main characteristics (continued) CT VIN CT f 80 90 ch.2 80 70 60 ch.1 Cross-talk CT (dB) Cross-talk CT (dB) ch.1 70 50 40 30 VCC = 13.2 V f = 1 kHz RL = 4 Ω 400 Hz HPF 30 kHz LPF Rg = 10 kΩ 20 10 ch.2 60 50 40 30 20 VCC = 13.2 V VIN = 40 mV[rms] RL = 4 Ω Rg = 10 kΩ 10 0 0 1 10 100 1 000 10 Input voltage VIN (mV[rms]) 100 90 90 80 80 70 60 50 PO = 1 W f = 1 kHz RL = 4 Ω 400 Hz HPF 30 kHz LPF Rg = 10 kΩ 40 30 20 10 5 15 20 50 40 30 VCC = 13.2 V f = 1 kHz RL = 4 Ω 400 Hz HPF 10 30 kHz LPF Rg = 10 kΩ 0 0 10 20 25 100 80 90 70 Muting effect MT (dB) Muting effect MT (dB) MT VMUTE 90 80 70 60 50 40 VCC = 13.2 V VIN = 40 mV[rms] RL = 4 Ω Rg = 10 kΩ 10 100 1 000 10 000 Frequency f (Hz) 10 100 Input voltage VIN (mV[rms]) 110 10 10 000 60 MT f 20 1 000 70 Supply voltage VCC (V) 30 100 000 MT VIN 100 Muting effect MT (dB) Muting effect MT (dB) MT VCC 0 10 000 Frequency f (Hz) 110 10 1 000 100 100 000 ch.2 ch.1 60 50 40 VCC = 13.2 V PO = 1 W f = 1 kHz RL = 4 Ω 400 Hz HPF 30 kHz LPF Rg = 10 kΩ 30 20 10 0 0.0 1.0 2.0 3.0 Mute voltage VMUTE (V) 4.0 5.0 ICs for Audio Common Use AN7199Z ■ Technical Information (continued) [2] Main characteristics (continued) Voffset VCC 200 250 180 200 Output offset voltage Voffset (mV) Quiescent circuit current ICQ (mA) ICQ VSTB 160 140 120 100 80 60 40 VCC = 13.2 V RL = 4 Ω Rg = 10 kΩ 20 0 0.0 2.0 1.0 3.0 4.0 ch.2 150 ch.1 100 ch.2 mute on 50 ch.1 mute on 0 −50 −100 −150 RL = 4 Ω Rg = 10 kΩ −200 −250 5.0 0 Standby voltage VSTB (V) 10 5 15 20 Supply voltage VCC (V) [3] Application note 1. Standby function 1) The power can be turned on or off by making pin 5 (standby terminal) high or low. Table 1 2) The standby terminal has threshold voltage of approx. 2.1 V, however, it has temperature dependency of approx. − 6 mV/°C. The recommended Terminal state Terminal voltage Power Open 0V Standby state Low 0 V to 1.0 V Standby state High Higher than 3 V Operating state 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. ISTB = VSTB−2.7 V [mA] 10 kΩ 5V VSTB 10 kΩ 5 RF Protection circuit Constant current source 0V Sub 2 kΩ 4 kΩ Figure 1 4) A power supply with no ripple component should be used for the control voltage of standby terminal . 11 AN7199Z ICs for Audio Common Use ■ Technical Information (continued) [2] Application note (continued) 2. Oscillation countermeasures 1) In order to increase the oscillation allowance, it is unnecessary to use a 1 capacitor and a resistor between each output terminal and GND. However, when inserting the capacitor for counter-measures against output To speaker 2,4 13,15 line noise between the output terminal and GND, insert a resistor of approx. 2.2 Ω in series as shown in figure 2. The oscillation may occur if only capacitor is used. Use it after giving a sufficient evaluation 2) The use of polyester film capacitor having a little fluctuation with tem- 0.01 µF to 0.1 µF 2.2 Ω 3,14 perature and frequency is recommended as the capacitor for countermeasures against output line noise. Figure 2 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 µF) for DC component cut in series with the input terminal. Check the low-pass frequency characteristics to determine the capacitor value. 2) 10 kΩ or less of signal source impedance Rg can reduce the output end 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 µF between the input terminal and input GND. When a high frequency signal is inputted, malfunction in protective circuits may occur. 15 µA 1 µF Input signal 0.01 µF 4. Ripple filter 6 11 10 kΩ 200 Ω 15 µA 600 Ω To power 30 kΩ Attenuator Figure 3 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 5 and the charge current is approx. 3 mA to 10 mA. 12 tio pp le re jec 60 me f ti -of 100 B ST STB -on tim 50 e 10 40 1.0 10 RF capacitor value (µF) Figure 4 100 Ripple rejection ratio (dB) 3) Relation between the rise time of circuit and a capacitor The larger the capacitance of the ripple filter is, the longer the 1 000 Ri The larger the capacitance of the ripple filter is, the better the ripple rejection becomes. STB-on/off time (ms) GND. 2) Relation between RR (Ripple Rejection Ratio) and a capacitor n 1) In order to suppress the fluctuation of supply voltage, connect a capacitor of approx. 33 µF between RF terminal (pin12) and ICs for Audio Common Use AN7199Z ■ Technical Information (continued) [2] Application note (continued) 4. Ripple filter (continued) 6) After the power supply is VCC 15 kΩ turned off (STB-low), it takes less than 10 seconds for the total circuit current to become the standby current (under 10 µA). If approx. 47 ohms resistor is inserted between the Constant current source Protection circuit 12 33 µF 350 µA 1.7 mA 10 kΩ ripple filter terminal and GND for the purpose of reducing VREF 10 kΩ the inspection time with set, a time until the current becomes 4 kΩ the standby current can be shortened. Figure 5 5. GND terminal 1) Be sure to short-circuit each GND terminal of pin 3, 8, 9 and 14 at the outside of the IC in use. 2) For each GND terminal, the one-point earth, referenced to the GND connection point of AN7198Z, AN7199Z 1 3 8 9 14 electrolytic capacitor between the supply terminal and GND, is most effective for reducing the distortion. Even in the worst case, ground pin 8, 9 of input GND separately from To GND of input Figure 6 all the other GND terminals. 3) Each GND terminal is not electrically short-circuited inside. Only pin 8 is connected with substrate. 4) Pin 9 is input signal GND. Connect only pin 9 with Pre-GND. 6. Cooling fin 1) The cooling fin is not connected with GND terminal by using Au wire. Only pin 8 is electrically connected through substrate. 2) Always attach an outside heat sink to the cooling fin. The cooling fin must be fastened onto a chassis for use. Otherwise, IC lead failure may occur. 3) Do not give the cooling fin any potential other than the GND potential. Otherwise, it may cause breakdown. 4) Connection of the cooling fin with GND can reduce the incoming noise hum. (It is unnecessary to connect with GND in use, but connect with the power GND when the cooling fin is connected with GND) 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 µF between the standby terminal and GND. 2) Mute on/off No shock noise is released. Refer to the section on the mute function. 13 AN7199Z ICs for Audio Common Use ■ Technical Information (continued) [2] Application note (continued) 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 7. The amplifier gain including attenuator block is given in the following equation : I1 × 50 GV = I2 Original gain From the above equation, the amplifier gain can be made as 0 time by setting I1 at 0 mA at muting. 3) The threshold voltage of VMUTE is as follows : Mute-off : approx. 1 V or less Mute-on : approx. 3 V or more I1 Input Mute/on 5V 22 kΩ VMUTE I2 Output stage I1 7 I2 0V Mute/off 1 µF 200 Ω Output stage Attenuator block I1 = approx.120 µA I2 = approx.120 µA Figure 7 4) Attack time and recovery time can be changed by the external CR of pin 7. For recommended circuits (In figure 7 22 kΩ, 1 µF), 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), (that is, 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 for the AN7198Z, and 40 dB for the AN7199Z. It is not possible to change those values by the addition of an external resistor. 14 ICs for Audio Common Use AN7199Z ■ Technical Information (continued) [2] Application note (continued) 10. Beep sound input function 1) The application circuit using the beep sound input is shown in figure 8. Connect the beep signals from the microcomputer to pin 10 via the capacitor C1 for DC cut and the resistor R1 for voltage gain adjustment. 2) The voltage gain of beep sound terminal is approx. −6.2 dB. In the setting value of figure 8, it becomes approx. −19.7 dB (f = 1 kHz). 3) The beep sound is outputted to the output, terminals pin 2 and pin 15. AN7198Z AN7199Z Rnf GVA 600 Ω 300 Ω 28 dB 34 dB C1 GVBEEP = 15 k+Rnf 1/jωC1+R1+7.8 Κ+ 2 GVA 2 Beep input Rnf 2 Rnf VREF = 6.3 V 47 kΩ 10 7.8 kΩ 15 kΩ 0.022 µF R1 15 kΩ × GVA VREF = 6.3 V 15 GVA Rnf Figure 8 11. Two IC use Figure 9 shows the application circuit example when two ICs are used : Out(RR) 10 kΩ Power supply 3 5 7 9 11 13 4 6 8 10 12 14 15 1 2 2 200 µF Standby 10 kΩ Mute Out(FR) 2.2 µF 22 µF to 47 µF 10 kΩ In(RR) Out(RL) In(FR) 10 kΩ 3 5 7 9 11 13 4 6 8 10 12 14 15 1 In(FL) 2 In(RL) S-GND 0.022 µF Beep Out(FL) 47 kΩ 10 kΩ Figure 9 15 AN7199Z ICs for Audio Common Use ■ 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 µF 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 µF capacitor into each IC. The best sound quality can be obtained by inserting a 2 200 µF capacitor near the terminal of each IC. 2) Standby terminal (pin 5) Even if the standby terminals are connected with each other, that 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 as large as the current which is described in 1. Standby function. 3) Muting terminal (pin 7) An abnormal operation does not occur 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 one IC is used. In terms of safety design, taking advantage of the fact that a large current is difficult to flow when the mute is being applied so that it is difficult to cause the destruction, it is designed so that the mute terminal will become High when an abnormality such as the short-circuit to VCC or short-circuit to GND takes place. (To avoid the influence of IC in an abnormal state when using two ICs). Do not connect a microcomputer directly to the mute terminal because the mute terminal voltage rises to approx. 12 V at that time. 4) Beep sound input terminal (pin 10) Even if the the beep sound input terminals are short-circuited each other, that 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 kΩ). 5) Ripple filter terminal (pin 12) Even if the ripple filter terminals are short-circuited each other, that 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 µF) to each IC. 12. Precautions on misuse 10 Ω (allowance: ±1%) 40 W Surge voltage 10000 µF/100 V 1) Erroneous connection in the case of short-circuit to VCC and short-circuit to GND or load short-circuit The AN7198Z, AN7199Z have the breakdown voltage of 20 V or higher when an short-circuit to VCC and short-circuit to GND or load short-circuit occur. However, there is a possibility of destruction, then smoke emission and ignition under a special condition. Avoid misuse and erroneous connection of the circuit. 2) Power supply surge The power supply surge breakdown voltage is evaluated by the test circuit shown in figure 10 and the surge waveform as shown in figure 11 is evaluated. The withstanding capability against power supply surge is 80 V for the AN7198Z, AN7199Z. VP 1 Ω (allowance: ±1%) 20 W 0.63 VP 0.37 VP D.U.T Figure 10. Power supply surge test circuit 16 0V 1 ms 6 ms 100 ms Figure 11. Surge waveform ICs for Audio Common Use AN7199Z ■ Technical Information (continued) [2] Application note (continued) 12. Precautions on misuse (continued) 3) Destruction mode for the AN7198Z, AN7199Z The AN7198Z, AN7199Z are the power ICs with high breakdown withstanding voltage but it has been found that the destruction occurs under special conditions. (1) GND-open short-circuit to GND Short-circuit of the output terminal to the GND terminal of power supply when GND terminal of the IC is open, or short-circuit to GND when the GND terminal of the IC is over 0.7 V higher than the shortcircuited output terminal. At that time, if VCC = more than 16 V and a voltage is also applied to STB terminal, then the destruction occurs. (2) Short-circuit to VCC of the plus and minus side output terminals at the same time If short-circuit to VCC fault occurs on both the plus and minus side output terminals at the same time with a short-circuit resistor which does not actuate the protection circuit. The power GND terminal current may exceed 10 A and the wire melts down since the current capacity of Au wire is exceeded. (3) VCC − GND reverse connection Parasitic device is created everywhere and the circuit destruction takes place. 1 VCC 12 Ripple filter ■ Application Circuit Example 2 15 Ch.2 Out (+) GND(input) Mute Ch.1 In GND(sub) 9 Ch.1 Out (+) Ch.2 In 11 13 Ch.2 Out (−) 7 4 Standby 5 Ch.1 Out (−) 6 14 Ch.2 GND Beep In 10 3 8 Ch.1 GND 17