LA4725_09

Ordering number : EN5715A Monolithic Linear IC LA4725 Overview 2-channel 30W BTL Audio Power Amplifier The LA4725 is a 2-channel BTL audio power amplifier IC for Car audio. It was designed for the best possible audio quality and features an extended low band roll-off frequency provided by a newly-developed NF circuit that does not require an external capacitor. Furthermore, crosstalk, which can cause muddiness in the audio output, has been significantly reduced by both circuit and wiring pattern improvements. Thus this amplifier can provide powerful lows and clear highs. Features • Total output (EIAJ power): 30W+30W (at VCC = 14.4V, RL = 4Ω, THD = 30%) • High-fidelity design (fL < 10Hz, fH = 130kHz) • Extremely low impulse noise levels • An arbitrary amplifier startup time can be set up with external components • built-in standby switch circuit • Full complement of built-in protection circuits (includes circuits that protect against shorting to VCC, shorting to ground, load shorting, over-voltages and excessive temperatures) Specifications Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Surge supply voltage Maximum output current Allowable power dissipation Operating temperature Storage temperature Symbol VCC max VCC surge IO peak Pd max Topr Tstg No signal t ≤ 0.2s, Giant pulse one-shot Per channel With a infinite heat sink Conditions Ratings 18 50 3.0 32 -35 to +85 -40 to +150 Unit V V A W °C °C Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer' s products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer' s products or equipment. 40109 MS JK 20090313-S00003 No.5715-1/8 LA4725 Operating Conditions at Ta = 25°C Parameter Recommended supply voltage Allowable operating supply voltage Recommended load resistance Symbol VCC VCC op RL Conditions Ratings 13.2 9 to 16 4 Unit V V Ω Note : With VCC, RL, and the output level in ranges such that the Pd max for the heat sink used is not exceeded. Electrical Characteristics at Ta = 25°C, VCC = 13.2V, RL = 4Ω, f = 1kHz, Rg = 600Ω Ratings Parameter Quiescent current Standby mode current drain Voltage gain Total harmonic distortion Output power Symbol ICCO Ist VG THD PO1 PO2 PO3 Output offset voltage Output noise voltage Ripple rejection ratio Channel separation Input resistance Standby pin applied voltage VN offset VNO SVRR CHsep Ri VST Amplifier on (applied through an external 10kΩ resistor) Rg = 0 Standby mode (amplifier off), with no power supply capacitor. VO = 0dBm PO = 2W THD = 10% THD = 10%, VCC = 14.4V THD = 30%, VCC = 14.4V Rg = 0 Rg = 0, BPF = 20Hz to 20kHz Rg = 0, VR = 0dBm, fR = 100Hz Rg = 10kΩ, VO = 0dBm 40 50 21 2.5 -300 0.1 50 60 30 39 VCC 13 38 40 0.06 17 20 30 +300 0.5 42 0.2 dB % W W W mV mV dB dB kΩ V Conditions min 70 typ 125 10 max 250 60 Unit mA µA Package Dimensions unit : mm (typ) 3113B 35 Pd max -- Ta Allowable power dissipation, Pd max -- W Infinite heat sink 26.8 (20.0) 32.5 30 HEAT SPREADER 4.0 (R1.7) (8.4) 25 20.83 20 θf = 3°C/W θf = 4°C/W AI heat sink Mounting torque 39N • cm Flat washer Silicone grease applied θjc = 2°C/W (11.8) 14.5MAX 15 13.9 10.4 10 7.8 θf = 7°C/W θf = 10°C/W 7.0 4.6 5.2 1 (1.83) 1.78 0.5 14 0.8 0.4 1.6 2.2 5 3.1 0 -40 Νο Fin -20 0 20 40 60 80 100 120 140 160 Ambient temperature, Ta -- °C SANYO : SIP14HZ No.5715-2/8 LA4725 Block Diagram C2 100µF/25V + + C5 VCC 2 14 OUTPUT PIN TO VCC SHORT PROTECTOR RIPPLE FILTER 0.1µF PREDRIVER C1 + 2.2µF 25V POWER 13 LOAD SHORT PROTECTOR POWER GND1 -OUT1 C6** 1 + − 2.2Ω 2.2Ω 2200µF 25V ñ IN 12 0.1µF R2 R3 RL 4Ω PREDRIVER POWER 11 OUTPUT PIN TO GND SHORT PROTECTOR C7** +OUT1 + PRE GND 3 BIAS CIRCUIT OVER VOLTAGE / SURGE PROTECTOR VCC R1 ON 10KΩ OFF +5V ** (POLYESTER FILM CAPACITOR) OUTPUT PIN TO GND SHORT PROTECTOR -OUT2 4 STANDBY SW THERMAL SHUT DOWN ñ 0.1µF PREDRIVER C4 IN2 + POWER 9 LOAD SHORT PROTECTOR POWER GND2 C8** 6 + − 2.2Ω 2.2Ω 0.1µF 2.2µF 25V IN 10 8 R4 R5 RL 4Ω C9** PREDRIVER POWER +OUT2 + OUTPUT PIN TO VCC SHORT PROTECTOR POP NOISE PREVENTION CIRCUIT 5 + C3 7 0.47µF 25V + C10 C3 Sets the amplifier starting time (Approximately 0.6 seconds when 33µF) 33µF 25V C10 Impulse noise reduction (Note : The device’s ability to withstand shorting to VCC or shorting to ground when VCC is around 16V may be reduced as the value of this capacitor is increased. We recommend 0.47µF.) No.5715-3/8 LA4725 Pin Voltages VCC = 13.2V, with 5V applied to STBY through a 10kΩ resistor, RL = 4Ω, Rg = 0 Pin No. Pin name Pin voltage 1 IN1 1.53V 2 DC 5.65V 3 PRE-GND 0V 4 STBY 3.25V 5 ON TIME 2.32V 6 IN2 1.53V 7 POP 2.14V Pin No. Pin name Pin voltage 8 +OUT2 5.70V 9 −OUT2 5.70V 10 PWR-GN 0V 11 +OUT1 5.70V 12 PWR-GN 0V 13 −OUT1 5.70V 14 VCC 13.2V External Components C1 and C4: Input capacitors. A value of 2.2µF is recommended. Determine the polarity based on the DC potential of the circuit connected directly to the LA4725 front end. Note that the low band response can be adjusted by varying fL with the capacitors C1 and C4. C2 : Decoupling capacitor (ripple filter) C3 : Sets the amplifier starting time, which will be approximately 0.6 seconds for a value of 33µF. The starting time is proportional to the value of this capacitor, and can be set to any desired value. C5 : Power-supply capacitor C6, C7, C8, and C9 : Oscillation prevention capacitors. Use polyester film capacitors (Mylar capacitors) with excellent characteristics. (Note that the series resistors R2, R3, R4, and R5 are used in conjunction with these capacitors to achieve stable amplifier operation.) A value of 0.1µF is recommended. C10 : Impulse noise reduction capacitor. A value of 0.47µF is recommended. Caution is required when selecting the value for this capacitor, since increasing its value influences the operation of the circuits that protect against shorting the amplifier output pins to VCC or to ground when higher VCC voltages (approximately 16V or higher) are used. R1 : Standby switch current limiting resistor. A value of 10kΩ is recommended when a voltage in the range 2.5 to 12V will be applied as the standby switching voltage. Note that this resistor is not optional: it must be included. IC Internal Characteristics and Notes 1. Standby function • Pin 4 is the standby switch. A voltage of 2.5V or higher must be applied through an external resistor to turn the amplifier on. • If a voltage of over 12V will be applied as the standby mode switching voltage, use the following formula to determine the value of R1 so that the current entering at pin 4 remains under 500µA. R1 = − 1.4 − 10kΩ 500µA Pin 4 Internal Equivalent Circuit 500µA or lower 10kΩ 4 R1 Applied standby voltage About 1.4V (2VBE) 2. Muting function • Pin 5 connects the capacitor that determines the starting time to prevent impulse noise. It can also be used to mute the amplifier output by shorting pin 5 to ground. When this function is used, the recovery time depends on C3. 3. Impulse noise improvements • While the LA4725 achieves a low level of impulse noise, if even further reductions in impulse noise at power on/off (and when switching into or out of standby mode) a 0.47µF capacitor may be inserted between pin 7 and the PRE GND pin (pin 3). (Pin 7 is the output amplifier bias pin. Since the ability to withstand shorting the output pins to VCC or ground is reduced for supply voltages over 16V if the pin 7 capacitance is large, we recommend a value of 0.47µF or lower for this capacitor.) No.6631-4/8 LA4725 4. Protection circuits • Due to the system structure of the protection circuit for shorts to VCC or ground, if there is a DC resistance between the amplifier output pins and ground, the protection circuit may operate when power is first applied and the amplifier may fail to turn on. The basic design approach we recommend is not to adopt any designs in which there is a DC resistance between the amplifier outputs and ground. • The LA4725 includes a built-in thermal protection circuit to prevent the IC from being damaged or destroyed if abnormally high temperatures occur. This thermal protection circuit gradually reduces the output if the IC junction temperature (Tj) reaches the range 170 to 180°C due to inadequate heat sinking or other problem. If the temperature falls, the amplifier will restart automatically. • The LA4725 also includes other protection circuits. Use of these circuits also requires care during end product design and testing. 5. Other notes • The LA4725 is a BTL power amplifier. When testing this device, the ground systems for the test equipment connected to IC inputs, and that for the test equipment connected to IC outputs, must be isolated. Do not use a common ground. Printed Circuit Pattern (copper foil side) GND VCC C5 + 14 1 LA4625/LA4725 C1 + + -OUT1 R2 GND C6 R1 +OUT1 R3 C7 + + C4 + C10 -OUT2 GND R4 R5 C8 +OUT2 C9 STB C3 IN2 IN1 C2 No.6631-5/8 LA4725 40 35 30 25 20 15 10 5 0 PO -- VCC f = 1kHz Rg = 600Ω RL = 4Ω % Output power, PO -- W 100 7 5 3 2 10 7 5 3 2 1.0 7 5 3 2 0.1 7 5 3 2 PO -- VIN VCC = 13.2V RL = 4Ω f = 1kHz Output power, PO -- W T HD = 30 TH D =1 0% 6 7 8 9 10 11 12 13 14 15 16 17 18 0.01 1.0 2 3 5 7 10 2 3 5 7 100 2 3 5 7 1k Supply voltage, VCC -- V 24 Input voltage, VIN -- mVrms PO -- f f Response 20 VCC = 13.2V RL = 4Ω Rg = 600Ω THD = 10% THD = 3% 2 0 Output power, PO -- W Response -- dB 16 -2 12 -4 THD = 1% 8 -6 4 -8 0 10 23 5 7 100 23 5 7 1k 23 5 7 10k 23 5 7100k -10 10 VCC = 13.2V RL = 4Ω Rg = 600Ω VO = 0dBm (f = 1kHz) 23 5 7 100 23 5 7 1k 23 5 7 10k 23 5 7100k Frequency, f -- Hz 10 7 5 3 2 1.0 7 5 3 2 0.1 7 5 3 2 0.01 0.1 2 3 5 7 1.0 2 3 5 7 10 2 3 5 7 100 Frequency, f -- Hz 10 7 5 3 2 1.0 7 5 3 2 0.1 7 5 3 2 0.01 10 2 3 5 7 100 2 3 5 7 1k 2 3 5 7 10k 2 3 5 7100k THD -- PO Total harmonic distortion, THD -- % THD -- f VCC = 13.2V RL = 4Ω PO = 1W Nonfilter Total harmonic distortion, THD -- % VCC = 13.2V RL = 4Ω Rg = 600Ω DIN AUDIO f = 1kHz 100Hz 10kHz Output power, PO -- W -20 Frequency, f -- Hz 120 CHsep -- f Output noise voltage, VNO -- mVrms VNO --VCC Rg = 0 RL = 4Ω Channel separation, CHsep -- dB -30 VCC = 13.2V RL = 4Ω Rg = 10kΩ VO = 0dBm Nonfilter 110 -40 100 CH1→2 -50 90 -60 CH2→1 80 -70 70 -80 10 60 23 5 7100 23 Frequency, f -- Hz 5 7 1k 23 5 7 10k 23 57 100k 8 10 12 14 16 18 Supply voltage, VCC -- V No.6631-6/8 LA4725 -20 SVRR -- VCC Ripple rejection ratio, SVRR -- dB Ripple rejection ratio, SVRR -- dB -30 RL = 4Ω Rg = 0 fR = 100Hz VCCR = 0dBm DIN AUDIO 0 SVRR -- VCCR VCC = 13.2V RL = 4Ω Rg = 0 Nonfilter -20 -40 -40 -50 OUT1 100Hz 100H OUT1 -60 -60 OUT2 T2 z OU UT1 3kHz O -70 -80 3kHz OU T2 SVRR = 20log -80 6 8 10 12 14 16 18 -100 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 VO VCCR 1.8 2.0 Supply voltage, VCC -- V 0 SVRR -- fR Power supply ripple, VCCR -- Vrms 160 ICCO -- VCC Ripple rejection ratio, SVRR -- dB -20 Quiescent current, ICCO -- mA VCC = 13.2V RL = 4Ω Rg = 0 VCCR = 0dBm Nonfilter RL = 4Ω Rg = 0 140 120 -40 OU -60 T1 100 OUT 2 80 -80 60 -100 10 23 5 7 100 23 5 7 1k 23 5 7 10k 23 5 7100k 40 6 8 10 12 14 16 18 20 22 36 36 36 36 Ripple frequency, fR -- Hz 12 VN -- VCC RL = 4Ω Rg = 0 Power dissipation, Pd -- W Supply voltage, VCC -- V 25 Pd -- PO 10 20 RL = 4Ω Rg = 600Ω f = 1kHz 8 VN -- V 15 6 VC 10 = C 14 .4 V V =1 CC 3.2 V 4 5 2 0 5 10 15 20 25 30 0 0.1 2 3 5 7 1.0 2 3 5 7 10 2 3 5 7 100 Supply voltage, VCC -- V 0.6 Amp ON time Output power, PO -- W VCC = 13.2V VST = 5V 0.5 Amp ON time -- s 0.4 0.3 0.2 0.1 0 1.0 2 3 5 7 10 2 3 5 7 100 C3 -- µF No.6631-7/8 LA4725 SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein. SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities concerned in accordance with the above law. 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SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as of April, 2009. Specifications and information herein are subject to change without notice. PS No.5715-8/8