an7196z

AN7196ZDual 15 W BTL power IC for car audiosOverviewThe AN7196Z is an audio power IC developed for thesound output of car audio (dual 15 W). Especially, thiscircuit has solved the problem of heat radiation designinherent to a single chip IC with 4-channel audio ouputand realized a corresponding space saving at the sametime.In addition, it is incorporating various protection cir-cuits to protect the IC from destruction by GND-openshort-circuit to GND and power supply surge which arethe most important subjects of power IC protection, andthe IC will largely contribute to a high reliability designof equipment.It is also incorporating the industry's first perfectmuting circuit, which is free from shock noise, so that ashock noise design under the set transient condition canbe made easily when the muting circuit is used togetherwith its standby function.The AN7196Z is pin compatible with the AN7191NZ(dual 20 W), so that the identical pattern design is allowedfor high-class types as well as popular types.18.00±0.3013.50±0.301.50±0.10Unit : mm4.00±0.20φ3.60±0.1013.25±0.302.40±0.50(1.80)(2.54)10.0±0.3015.65±0.5011.270.50–0.10+0.2015(0.61)R0.55(1.95)0.25–0.05+0.1519.00±0.3019.30±0.30HZIP015-P-0745AsFeatures•Built-in various protection circuits (realizing high breakdown voltage against destruction )Power supply surge breakdown voltage of 100 V or moreGround open breakdown voltage of 16 V or more•Built-in standby function (free from shock noise at standby on/off)•Built-in muting function (the industry's first)Free from shock noise at mute-on/offAdapting attenuator method so that abnormal sound due to waveform deformation is not generatedAttack time, recovery time of 50 ms or less•Space saving design is possible with a small size packageA heat radiation design that has been a problem particularly in a 4-ch. single chip IC can be done by the conventionalmethod.•Reduction in external components (parts reduction to half compared with the AN7176K)It eliminates the need for NF and BS electrolytic capacitors,Muting function is unnecessaryPower supply choke coil is unnecessary•Provided with beep sound input pin•Pin compatible with the AN7191NZ (dual 20 W)sApplications•Car audio18.95±0.503.25±0.101

AN7196Z

sBlock Diagram

VCCICs for Audio Common Use

Ripple filter12Ch.1 GNDCh.1 Out (−)34Att.1Ref.1413Ch.2 GNDCh.2 Out (−)Protection Cct.Att.Ch.1 Out (+)2Att.10658Att.Con.11715Att.9Ch.2 Out (+)Ch.1 InStandbyMuteGND(sub)Ch.2 InsPin Descriptions

Pin No.12345678

Description

Power supplyCh.1 output (+)Grounding (output ch.1)Ch.1 output (−)StandbyCh.1 inputMutingGrounding (sub)

Pin No.9101112131415

Description

Grounding (input)Beep sound inputCh.2 inputRipple filterCh.2 output (−)Grounding (output ch.2)Ch.2 output (+)

s Absolute Maximum Ratings

Parameter

Supply voltage *2Peak supply voltage *3Supply currentPower dissipation *4

Operating ambient temperature *1Storage temperature *1

Note)*1:

*2:*3:*4:

SymbolVCCVsurgeICCPDToprTstg

Rating25809.059−30 to +85−55 to +150

GND(input)Beep InUnitVVAW°C°C

All items are at Ta = 25°C, except for the operating ambient temperature and storage temperature.Without signalTime = 0.2 sTa = 85°C

2

ICs for Audio Common Use

sRecommended Operating Range

Parameter

Supply voltage

SymbolVCC

Range8.0 to 18.0

AN7196Z

UnitV

sElectrical Characteristics at VCC = 13.2 V, f = 1 kHz, Ta = 25°C

Parameter

Quiescent currentStandby currentOutput noise voltage *1Voltage gain 1

Total harmonic distortion 1Maximum output power 1Ripple rejection ratio *1Channel balanceCross-talk *1

Output offset voltageMuting effect *1Input impedanceVoltage gain 2

Total harmonic distortion 2Maximum output power 2Shock noise *2

Total harmonic distortion 3

SymbolICQISTBVNOGV1THD1PO1RRCBCTVOffMTZiGV2THD2PO2VSTHD3

Conditions

VIN = 0 mV, RL = 4 ΩVIN = 0 mV, RL = 4 ΩRg = 4.7 kΩ, RL = 4 ΩVIN = 40 mV, RL = 4 ΩPO = 0.5 W, RL = 4 ΩTHD = 10%, RL = 4 ΩRL = 4 Ω, Rg = 4.7 kΩ,Vr = 1 V[rms], fr = 1 kHzVIN = 40 mV, RL = 4 ΩVIN = 40 mV, RL = 4 Ω,Rg = 4.7 kΩ

Rg = 4.7 kΩ, RL = 4 ΩVIN = 40 mV, RL = 4 ΩVIN = ± 0.3 VDC

VIN = 40 mV, RL = 2 ΩPO = 0.5 W, RL = 2 ΩTHD = 10%, RL = 2 ΩRL = 4 Ω, Rg = 4.7 kΩ

VSTB = on/off, 50 Hz HPF-onVIN = 10 mV, fIN = 20 kHzRg = 4.7 kΩ, RL = ∞

Min32126055−25070223212−100

Typ12010.22340.07147006508228340.12000.10

Max250100.5360.4125035360.5

UnitmAµAmV[rms]dB%WdBdBdBmVdBkΩdB%W

100mV[p-0]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

5 V0 V120 ms120 ms3

AN7196Z

s Terminal Equivalent Circuits

Pin No.1Equivalent circuitICs for Audio Common Use

DescriptionSupply voltage pinSupply connection pinDC Voltage13.2 V21Drive circuitCh.1 output pin (+)Pre-amp.Ch.1 positive-phase output pin6.6 V2Drive circuitVREF = 6.6 V600 Ω315 kΩ3GND (output)Grounding pin for ch.1 output0 V41Drive circuitCh.1 output pin (−)Pre-amp.Ch.1 inverted-phase output pin6.6 V4Drive circuitVREF = 6.6 V600 Ω3󰉹5510 kΩ15 kΩStandby control pinStandby changeover pinThreshold voltage approx. 2.1 V900 Ω66200 ΩApprox.Approx. 15 µA15 µA400 ΩCh.1 input pinCh.1 input signal applied pinInput impedance 30 kΩ0 mV to10 mV30 kΩ4

ICs for Audio Common Use

s Terminal Equivalent Circuits (continued)

Pin No.775 kΩEquivalent circuitDescriptionMute control pinMute changeover pinThreshold voltage approx. 2.0 VAN7196Z

DC Voltage8GND (substrate)Being connected with substrate only0 V9GND (input)Ground pin for input0 V10VREF = 2.1 V600 Ω600 Ω25 kΩ25 kΩ10600 ΩVREF = 2.1 V600 Ω15 kΩ15Beep sound input pinBeep sound signal input pinInput impedance 25 kΩ2.1 V15 kΩ21111200 ΩApprox.Approx. 15 µA15 µA400 ΩCh.2 input pinCh. 2 input signal applied pinInput impedance 30 kΩ0 mV to10 mV30 kΩ12VCC30 kΩ12Quick discharge circuitRipple filter pinOutput current 3 mA to 10 mA13.0 V200 µA20 kΩ5

AN7196Z

s Terminal Equivalent Circuits (continued)

Pin No.131Drive circuitICs for Audio Common Use

Equivalent circuitPre-amp.DescriptionCh.2 output pin (−)Ch.2 inverted-phase output pinDC Voltage6.6 V13Drive circuitVREF = 6.6 V600 Ω1515 kΩ14GND(output)Grounding pin for ch.2 output0 V151Drive circuitCh.2 Output pin (+)Pre-amp.Ch.2 positive-phase output pin6.6 V14Drive circuitVREF = 6.6 V600 Ω1515 kΩsUsage Notes

1.Always attach an outside heat sink to use the chip. In addition, the outside heat sink must be fastened onto achassis for use.

2.Connect the cooling fin to GND potential.

3.Avoid short-circuit to VCC and short-circuit to GND faults, and load short-circuit.

4.The temperature protection circuit will be actuated at Tj = approx. 150°C, but it is automatically reset when thechip 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 witharound 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

sTechnical Information

[1]PD  Ta curves of HZIP015-P-0745A

PD  Ta

120113.6100AN7196Z

Infinity heat sinkRth (j−c) = 1.1°C/WRth (j−a) = 68.3°C/WPower dissipation PD (W)806059.51°C/W heat sink40.34030.520.52011.31.802°C/W heat sink3°C/W heat sink5°C/W heat sink10°C/W heat sinkWithout heat sink0255075100125150Ambient temperature Ta (°C)[2]Application note1.Standby function

1)The power can be turned on or off by

making pin 5 (standby terminal) highor low.

2)The standby terminal has threshold

voltage of approx. 2.1 V, however, ithas temperature dependency ofapprox. − 6 mV/°C. The recommendedrange of use is shown in table 1.

Terminal state

OpenLowHigh

Table 1Terminal voltage

0 V0 V to 1.0 VHigher than 3 V

PowerStandby stateStandby stateOperating state

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.

VSTB−2.7 V10 kΩ

ISTB=

[mA]

VSTB5 V0 V510 kΩRFProtection circuitConstant current sourceSub3.5 kΩ3.5 kΩ3.5 kΩ3.5 kΩFigure 1

4)A power supply with no ripple component should be used for the control voltage of standby terminal .

7

AN7196Z

sTechnical Information (continued)

[2]Application note (continued)

ICs for Audio Common Use

12.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 shownin figure 2.

2)The use of polyester film capacitor having a little fluctuation with

temperature and frequency is recommended as the 0.1 µF capacitor

for oscillation prevention.

3,142,413,15To speaker0.1 µF2.2 Ω3.Input terminalFigure 21)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 inputterminal. 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 ofcoupling 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 µA15 µA1 µFInput signal0.01 µF64.7 kΩ11200 Ω30 kΩ400 ΩAttenuatorTo power4.Ripple filterFigure 3

1)In order to suppress the fluctuation of supply voltage, connect a capacitor of approx. 33 µF between RF

terminal (pin12) and GND.2)Relation between RR (Ripple Rejection Ratio) and a capacitor

The larger the capacitance of the ripple filter is, the better theripple rejection becomes.

3)Relation between the rise time of circuit and a capacitor

STB-on/off time (ms)ejecThe larger the capacitance of the ripple filter is, the longer thetime from the power on (standby high) to the sound releasebecomes.

4)The DC voltage of output terminal is approximately the middlepoint of the ripple filter terminal voltage.

5)The internal circuit of ripple filter terminal is as shown in fig-ure 5 and the charge current is approx. 3 mA to 10 mA.

6)The muting circuit turns on when the ripple filter terminal is

VCC − 4 VBE or less.

For that reason, abnormal sound due to waveform distortion atrising and falling of the circuit is not released.

8

1 000tionRipple rSToB-ff time601005010401.010100RF capacitor capacitance value (µF) Figure 4

Ripple rejection ratio (dB)STB-on timeICs for Audio Common Use

sTechnical Information (continued)

[2]Application note (continued)4.Ripple filter (continued)

VCC30 kΩ1233 µF200 µA30 kΩ10 kΩVREF10 kΩQuick discharge circuitConstant current sourceProtection circuitAN7196Z

Detection circuitTo muting circuit3.5 kΩ3.5 kΩFigure 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 ofelectrolytic capacitor between the supply ter-minal and GND, is most effective for reduc-ing the distortion. Even in the worst case,ground pin 8, 9 of input GND separately fromall the other GND terminals.

Figure 6138914AN7196ZTo GND of input3)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 slightshock 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.

9

AN7196Z

sTechnical Information (continued)

[2]Application note (continued)

ICs for Audio Common Use

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

× 50GV =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 lessMute-on: approx. 3 V or more

5 VVMUTE0 VMute/on4.7 kΩMute/off4)Attack time and recovery time can be changed by the external CR of pin 7. For recommended circuits (In

figure 7 4.7 kΩ, 10 µF), the above mentioned times are as follows :

Attack time: Approx. 30 msRecovery time: Approx. 40 ms

However, the control voltage of VMUTE is assumed to be 5 V. When it is not directly controlled bymicrocomputer (5 V), (that is, 13.2 V separate power supply), it is necessary to change CR values because theabove 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.

←I1I2Input75 kΩAttenuator blockI1I2Output stage10 µFOutput stageI1 = approx.120 µAI2 = approx.120 µAFigure 7

10

ICs for Audio Common Use

sTechnical Information (continued)

[2]Application note (continued)

AN7196Z

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. −4.3 dB. With settings shown in the following drawing, itis approx. −17.2 dB (f = 1 kHz).

3)The beep signal is outputted to output terminals, pin 2 and pin 15 only.

600 Ω28 dB2Beep inputC147 kΩ1025 kΩ25 kΩ600 ΩVREF = 2.1 V28 dB15VREF = 2.1 V0.022 µFR1󰉹 󰉹 300 󰉹󰉹󰉹 GV = × 50󰉹󰉹 25 k+600

1/jωC1+R1+

2

Figure 8

11.Two IC use

Figure 9 shows the application circuit example when two ICs are used :

Power supply4.7 kΩ2 200 µFOut(RR)11131513579 Standby2.2 kΩMute22 µF0.1 µF0.1 µF2.2 Ω2.2 ΩOut(FR)101214246847 µFIn(RR)In(FR)In(RL)In(FL)1 µFS-GND1 µF1 µF1 µF0.1 µF0.1 µF4.7 kΩ2.2 Ω2.2 ΩOut(RL)4.7 kΩ111315135790.1 µF0.1 µF2.2 Ω2.2 ΩOut(FL)1012In(FL)0.022 µF47 kΩ1424680.1 µF0.1 µF4.7 kΩ2.2 Ω2.2 ΩFigure 911

AN7196Z

sTechnical Information (continued)

[2]Application note (continued)

ICs for Audio Common Use

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 capacitoror 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 currentflowing 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 twiceand 1/2 time respectively, the time constant value becomes as same as the value when one IC is used.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 abnormaloperation.

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 abnormaloperation.

However, if the standby of each IC is individually controlled, the short-circuiting is not allowed. Use thecircuit after connecting a capacitor (33 µF) to each IC.

6)If one IC is used as a combination of L or R of the front and the rear, the cross-talk between the L and R

increases. The circuit shown by figure 9 becomes thermally advantageous when there is a difference in the

output between the front and rear.7)Arrangement of IC

The larger the distance between the two ICs is, the more advantageous the heat radiation design becomes.

sApplication Circuit Example

VCC12Ripple filter14Ch.2 GND13Ch.2 Out (−)15Ch.2 Out (+)Standby5Ch.2 In1167GND(input)Ch.1 InMute9Ch.1 GND3Ch.1 Out (−)4Ch.1 Out (+)2Beep In10812

GND(sub)1