Ordering number : EN6631A Monolithic Linear IC LA4625 2-channel 13.5W BTL Audio Power Amplifier Overview The LA4625 is a 2-channel general-purpose BTL audio power amplifier provided in a miniature package. 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. Note that this device is pin compatible with the 20W×2-channel LA4628, and allows end products differentiated by their power rating to share the same printed circuit board. Features • Total output : 13.5W+13.5W (at VCC = 12V, RL = 4Ω, THD = 10%) • PMPO reference data : 115W×2 (VCC = 20V, RL = 4Ω) • High-fidelity design (fL < 10Hz, fH = 130kHz) • Extremely low impulse noise levels • An arbitrary amplifier startup time can be set up with external components. • Full complement of built-in protection circuits (includes circuits that protect against shorting to VCC, shorting to ground, load shorting, overvoltages and excessive temperatures) Specifications Maximum Ratings at Ta = 25°C Parameter Symbol Maximum supply voltage VCC max No signal Conditions Maximum output current IO peak Per channel Allowable power dissipation Pd max With an arbitrarily large heat sink Operating temperature Storage temperature Ratings Unit 24 V 3.5 A 32.5 W Topr -20 to +85 °C Tstg -40 to +150 °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. O0808 MS JK/92900RM (OT) No.6631-1/8 LA4625 Operating Conditions at Ta = 25°C Parameter Symbol Recommended supply voltage VCC Recommended load resistance range RL op Allowable operating supply voltage VCC op Conditions Ratings Unit 12 V 4 to 8 Ω 7.2 to 20 V 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 = 12V, RL = 4Ω, f = 1kHz, Rg = 600Ω Ratings Parameter Symbol Conditions min Quiescent current ICCO Rg = 0 Standby mode current drain Ist Standby mode (amplifier off), with no power typ 65 Unit max 120 240 mA 10 60 µA 40 42 dB 0.06 0.2 supply capacitor. Voltage gain VG VO = 0dBm Total harmonic distortion THD PO = 1W, Filter = FLAT 38 Output power PO1 THD = 10% Output offset voltage VN offset Rg = 0 Output noise voltage VNO Rg = 0, BPF = 20Hz to 20kHz 10 W -300 +300 mV 0.5 mV 0.1 Ripple rejection ratio SVRR Rg = 0, VR = 0dBm, fR = 100Hz 40 50 Channel separation CHsep Rg = 10kΩ, VO = 0dBm 50 60 Input resistance Ri 21 30 Standby pin applied voltage VST Amplifier on % 13.5 dB dB 39 2.5 kΩ VCC V (applied through an external 10kΩ resistor) Package Dimensions unit : mm (typ) 3113B Pd max -- Ta Allowable power dissipation, Pd max -- W 35 32.5 Infinite heat sink AI heat sink Mounting torque 39N • cm Flat washer Silicone grease applied 30 25 20.83 20 15 13.9 10.4 10 5 3.1 θf = 3˚C/W θf = 4˚C/W θjc = 2˚C/W θf = 7˚C/W θf = 10˚C/W Νο Fin 0 -20 0 20 40 60 80 100 120 140 160 Ambient temperature, Ta -- ˚C No.6631-2/8 LA4625 Block Diagram C2 100µF/16V + + C5 14 2 OUTPUT PIN TO VCC SHORT PROTECTOR + – PREDRIVER PRE GND 3 STANDBY SW R2 RL R3 4Ω C7** +OUT1 + ** (POLYESTER FILM CAPACITOR) VCC 4 OFF C6** OUTPUT PIN TO GND SHORT PROTECTOR OVER VOLTAGE / SURGE PROTECTOR BIAS CIRCUIT 12 11 POWER R1 ON 10KΩ THERMAL SHUT DOWN OUTPUT PIN TO GND SHORT PROTECTOR +5V 6 + 2.2µF 10V – LOAD SHORT PROTECTOR IN PREDRIVER POWER GND2 0.1µF 10 8 POWER – -OUT2 C8** 2.2Ω 2.2Ω IN2 + RL 4Ω R4 R5 C9** +OUT2 + OUTPUT PIN TO VCC SHORT PROTECTOR POP NOISE PREVENTION CIRCUIT 7 5 + C3 0.47µF 10V C4 9 POWER 0.1µF PREDRIVER 33µF 10V Standby SW POWER GND1 LOAD SHORT PROTECTOR IN – -OUT1 0.1µF 1 2.2µF 10V 13 POWER 2.2Ω 2.2Ω PREDRIVER 0.1µF RIPPLE FILTER C1 + 2200µF 25V VCC + C10 C3 Sets the amplifier starting time (Approximately 0.6 seconds when 33µF) 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.6631-3/8 LA4625 Pin Voltages VCC = 12V, with 5V applied to STBY through a 10kΩ resistor, RL = 4Ω, Rg = 0 Pin No. 1 2 3 4 5 6 7 Pin name IN1 DC PRE-GND STBY ON TIME IN2 POP Pin voltage 1.46V 5.18V 0V 3.21V 2.26V 1.46V 2.05V Pin No. 8 9 10 11 12 13 14 Pin name +OUT2 −OUT2 PWR-GN +OUT1 PWR-GN −OUT1 VCC Pin voltage 5.21V 5.21V 0V 5.21V 0V 5.21V 12V 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 LA4625 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 = Pin 4 Internal Equivalent Circuit 500µA or lower 10kΩ 4 R1 Applied standby voltage About 1.4V (2VBE) <applied voltage> − 1.4 − 10kΩ 500µA 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 LA4625 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 LA4625 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 LA4625 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 LA4625 also includes other protection circuits. Use of these circuits also requires care during end product design and testing. 5. Other notes • The LA4625 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) No.6631-5/8 LA4625 PO -- VCC 60 f = 1kHz Rg = 600Ω RL = 4Ω Output power, PO -- W 50 Output power, PO -- W 100 7 5 3 2 40 0% 30 HD =3 T 10% 20 10 0 6 7 8 9 10 11 12 13 14 15 16 17 PO -- VIN VCC = 12V RL = 4Ω f = 1kHz 10 7 5 3 2 1.0 7 5 3 2 0.1 7 5 3 2 0.01 1.0 18 2 3 16 THD = 10% THD = 3% THD = 1% 8 2 3 5 7 100 2 3 5 7 1k 2 3 5 7 10k 2 3 2 1.0 7 5 10kHz 2 100kHz 1kHz 3 Total harmonic distortion, THD -- % Total harmonic distortion, THD -- % 3 7 1k VCC = 12V RL = 4Ω Rg = 600Ω VO = 0dBm at f = 1kHz 2 3 5 7 100 2 3 5 7 1k 2 3 5 7 10k 2 3 5 7100k THD -- f 10 7 5 VCC = 12V RL = 4Ω PO = 1W 3 2 1.0 7 5 3 2 0.1 7 5 3 2 3 5 7 1.0 2 3 5 7 10 2 3 0.01 10 5 7 100 2 3 5 7 100 CHsep -- f VCC = 12V RL = 4Ω Rg = 10kΩ VO = 0dBm 10 20 30 40 CH1→2 50 60 CH2→1 70 80 2 3 5 7100 2 3 5 7 1k 2 3 Frequency, f -- Hz 5 7 10k 2 3 5 7 10k 2 3 5 7100k 2 3 5 7100k VNO -- Rg 1.0 VCC = 12V RL = 4Ω 7 Output noise voltage, VNO -- mVrms 0 2 3 5 7 1k Frequency, f -- Hz Output power, PO -- W Channel separation, CHsep -- dB 5 2 2 90 10 3 Frequency, f -- Hz VCC = 12V RL = 4Ω Rg = 600Ω 0.1 7 5 2 -6 -10 10 5 7100k THD -- PO 3 7 100 -4 Frequency, f -- Hz 10 7 5 5 -2 -8 4 0.01 0.1 3 0 Response -- dB Output power, PO -- W 20 0 10 2 2 VCC = 12V RL = 4Ω Rg = 600Ω 12 7 10 f Response PO -- f 24 5 Input voltage, VIN -- mVrms Supply voltage, VCC -- V 5 3 2 0.1 7 5 3 2 0.01 100 2 3 5 7 1k 2 3 5 7 10k 2 Signal source resistance, Rg -- Ω 3 5 7 100k No.6631-6/8 LA4625 SVRR -- VCC Rg = 0 fR = 100Hz VCCR = 0dBm -20 -40 OUT1 OUT2 -60 -80 -100 SVRR -- VCCR 0 Ripple rejection ratio, SVRR -- dB Ripple rejection ratio, SVRR -- dB 0 VCC = 12V RL = 4Ω -20 100Hz OUT1 100Hz OUT2 -40 -60 3kHz OUT1 3kHz OUT2 -80 SVRR = 20log -120 4 6 7 8 10 12 14 16 18 20 -100 22 0 0.2 0.4 SVRR -- fR 1.0 1.2 1.4 1.6 1.8 2.0 -40 OUT1 -60 OUT2 -80 ICCO -- VCC 180 RL = Open Rg = 0 160 Quiescent current, ICCO -- mA Ripple rejection ratio, SVRR -- dB VCC = 12V RL = 4Ω Rg = 0 VCCR = 0dBm -20 0.8 Power supply ripple, VCCR -- Vrms Supply voltage, VCC -- V 0 0.6 VO VCCR 140 120 100 80 60 40 20 2 3 5 7 100 2 3 5 7 1k 2 3 5 7 10k 2 3 0 5 7100k 0 4 8 12 Ripple frequency, fR -- Hz VN -- VCC 12 20 24 28 Power dissipation, Pd -- W 8 6 4 2 5 10 15 20 25 30 35 I CC 3 10 7 5 3 2 2 5V V CC 10 =1 VCC 7 = 12V 1.0 7 5 5 3 3 2 2 1.0 0.1 2 3 5 7 1.0 2 3 5 7 10 2 3 5 0.1 7 100 Output power, PO -- W/CH Supply voltage, VCC -- V Amp ON time 1.0 36 RL = 4Ω Rg = 600Ω f = 1kHz 7 5 0 0 32 Pd, ICC -- PO 100 RL = 4Ω Rg = 0 10 VN -- V 16 Supply voltage, VCC -- V Power dissipation, ICC -- A -100 10 VCC = 12V VST = 5V Amp ON time -- s 0.8 0.6 0.4 0.2 0 1.0 2 3 5 7 10 2 3 5 7 100 C3 -- µF No.6631-7/8 LA4625 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 October, 2008. Specifications and information herein are subject to change without notice. PS No.6631-8/8