LA4628_08

Ordering number : EN6632A Monolithic Linear IC LA4628 Overview For General Audio 20W 2-Channel BTL Power Amplifier The LA4628 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 13.5W×2-channel LA4625, and allows end products differentiated by their power rating to share the same printed circuit board. Features • Total output : 20W+20W (at VCC = 13.5V, RL = 4Ω, THD = 10%) • 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 Maximum supply voltage Maximum output current Allowable power dissipation Operating temperature Storage temperature Symbol VCC max IO peak Pd max Topr Tstg No signal Per channel With an arbitrarily large heat sink Conditions Ratings 24 4 32.5 -20 to +85 -40 to +150 Unit 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. O0808 MS JK/92900RM(OT) No.6632-1/8 LA4628 Operating Conditions at Ta = 25°C Parameter Recommended supply voltage Recommended load resistance range Allowable operating supply voltage range Symbol VCC RL op VCC op Conditions Ratings 13.5 4 to 8 9 to 20 Unit V Ω 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 = 13.5V, 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 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) Conditions With Rg = 0 and RL open. Standby mode (amplifier off), with no power supply capacitor. VO = 0dBm PO = 1W, Filter = FLAT VCC = 13.5V, THD = 10%, RL = 4Ω VCC = 16.5V, THD = 10%, RL = 4Ω 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 16 38 40 0.06 20 30 +300 0.5 42 0.2 dB % W W mV mV dB dB KΩ V min 70 typ 130 10 max 250 60 Unit mA µA Package Dimensions unit : mm (typ) 3113B 35 Pd max -- Ta Infinite heat sink Allowable power dissipation, Pd max -- W 32.5 30 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 15 13.9 10.4 10 θf = 7˚C/W θf = 10˚C/W 5 3.1 Νο Fin 0 20 40 60 80 100 120 140 160 0 -20 Ambient temperature, Ta -- ˚C No.6632-2/8 LA4628 Block Diagram C2 100µF/16V + + C5 VCC 2200µF 25V 2 14 OUTPUT PIN TO VCC SHORT PROTECTOR RIPPLE FILTER 0.1µF PREDRIVER C1 + 2.2µF 10V POWER 13 LOAD SHORT PROTECTOR POWER GND1 -OUT1 C6** 2.2Ω 2.2Ω – 1 + – 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 Standby SW +5V ** (POLYESTER FILM CAPACITOR) OUTPUT PIN TO GND SHORT PROTECTOR -OUT2 0.1µF 4 STANDBY SW THERMAL SHUT DOWN – PREDRIVER C4 IN2 + POWER 9 LOAD SHORT PROTECTOR POWER GND2 C8** 2.2Ω 2.2Ω 6 + – 0.1µF 2.2µF 10V IN 10 8 R4 R5 RL 4Ω C9** PREDRIVER POWER +OUT2 + OUTPUT PIN TO VCC SHORT PROTECTOR POP NOISE PREVENTION CIRCUIT 5 + C3 0.47µF 10V 33µF 10V 7 + 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.6632-3/8 LA4628 Pin Voltages VCC = 13.5V, with 5V applied to STBY through a 10kΩ resistor, RL = 4Ω, Rg = 0 Pin No. Pin name Pin voltage 1 IN1 1.55V 2 DC 6.63V 3 PRE–GND 0V 4 STBY 3.21V 5 ON TIME 2.32V 6 IN2 1.55V 7 POP 2.07V Pin No. Pin name Pin voltage 8 +OUT2 6.6V 9 -OUT2 6.5V 10 PWR–GND 0V 11 +OUT1 6.5V 12 PWR–GND 0V 13 -OUT1 6.6V 14 VCC 13.5V External Components : Input capacitors. A value of 2.2µF is recommended. Determine the polarity based on the DC potential of the circuit connected directly to the LA4628 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 13.5V will be applied as the standby switching voltage. Note that this resistor is not optional : it must be included. C1 and C4 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 13.5V 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) −1.4 500µA −10kΩ 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. No.6632-4/8 LA4628 3. Impulse noise improvements • While the LA4628 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.) 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 LA4628 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 LA4628 also includes other protection circuits. Use of these circuits also requires care during end product design and testing. 5. Other notes • The LA4628 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 C5 VCC + 14 1 LA4628 C1 + + -OUT1 R2 GND C6 STB R1 C3 +OUT1 R3 C7 C4 + C10 -OUT2 GND R4 C8 +OUT2 R5 C9 + + IN2 C2 IN1 No.6632-5/8 LA4628 40 35 30 25 20 15 10 5 0 PO -- VCC f = 1kHz Rg = 600Ω THD = 10% 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 = 13.5V RL = 4Ω f = 1kHz Output power, PO -- W =4 RL Ω =6 Ω RL 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 25 Input voltage, VIN -- mVrms 2 PO -- f THD = 10% f Response 20 0 Output power, PO -- W THD = 3% 15 THD = 1% Response -- dB -2 -4 10 -6 5 0 10 VCC = 13.5V RL = 4Ω Rg = 600Ω 23 5 7 100 23 5 7 1k 23 5 7 10k 23 57 100k -8 -10 10 VCC = 13.5V RL = 4Ω Rg = 600Ω VO = 0dBm at 1kHz 23 5 7 100 23 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, Ta -- °C 5 7 1k 23 5 7 10k 23 57 100k THD -- PO Total harmonic distortion, THD -- % Total harmonic distortion, THD -- % VCC = 13.5V RL = 4Ω Rg = 600Ω 10 7 5 3 2 1.0 7 5 3 2 0.1 7 5 3 2 0.01 0.1 THD -- PO VCC = 13.5V RL = 6Ω Rg = 600Ω 10kHz 10kHz 100Hz 1kHz 1kHz 100Hz 2 3 5 7 1.0 2 3 5 7 10 2 3 5 7 100 Output power, PO -- W 10 7 5 3 2 1.0 7 5 3 2 0.1 7 5 3 2 0.01 10 23 5 7 100 23 5 7 1k 23 5 7 10k 23 5 7100k THD -- f Output power, PO -- W 0 CHsep -- f Total harmonic distortion, THD -- % Channel separation, CHsep -- dB VCC = 13.5V RL = 4Ω RO = 1W -10 -20 -30 -40 -50 -60 -70 -80 -90 10 VCC = 13.5V RL = 4Ω Rg = 10kΩ VO = 0dBm CH1→2 CH2→1 23 5 7 100 23 5 7 1k 23 5 7 10k 23 5 7100k Frequency, f -- Hz Frequency, f -- Hz No.6632-6/8 LA4628 1.0 7 VNO -- Rg Ripple rejection ratio, SVRR -- dB Output noise voltage, VNO -- mVrms 5 3 2 VCC = 13.5V RL = 4Ω DIN AUDIO 0 SVRR -- VCC Rg = 0 fR = 100Hz VCCR = 0dBm -20 -40 OUT1 OUT2 0.1 7 5 3 2 0.01 100 -60 -80 -100 2 3 5 7 1k 2 3 5 7 10k 2 3 5 7 100k -120 5 7 9 11 13 15 17 19 21 23 Signal source resistance, Rg -- Ω SVRR -- VCCR Ripple rejection ratio, SVRR -- dB Ripple rejection ratio, SVRR -- dB Supply voltage, VCC -- V 0 SVRR -- fR -20 VCC = 13.5V RL = 4Ω Rg = 0Ω -20 VCC = 13.5V RL = 4Ω Rg = 0 VCCR = 0dBm -40 100Hz OUT1 100Hz OUT2 3kHz OUT2 -40 -60 OUT1 -60 3kHz OUT1 OUT2 -80 -80 Calculated at SVRR = 20log -100 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 VO VCCR 1.8 2.0 -100 10 23 5 7 100 23 5 7 1k 23 5 7 10k 23 57 100k Power supply ripple, VCCR -- Vrms 32 28 Pd -- PO (RL = 4Ω) Ripple frequency, fR -- Hz 32 28 Pd -- PO (RL = 6Ω) Power dissipation, Pd -- W 24 20 Power dissipation, Pd -- W RL = 4Ω Rg = 600Ω f = 1kHz Calculated at Pd = (VCC × ICC) - (2PO) V) 6.5 24 20 18 RL = 6Ω Rg = 600Ω f = 1kHz Calculated at Pd = (VCC × ICC) - (2PO) 5V Pd (1 16 12 Pd P 12 8 4 1 d( 6.5 (1 V) 3. ) Pd (13 .5V ) 0 0.1 2 3 5 7 1.0 2 3 5 7 10 2 3 5 7 100 0 0.1 2 3 5 7 1.0 2 3 5 7 10 2 3 5 7 100 Output power, PO -- W/CH 6 ICC -- PO Output power, PO -- W/CH 5 RL = 4/6Ω Rg = 600Ω f = 1kHz Current drain, ICC -- A 4 2 1 0 0.1 2 3 5 7 1.0 2 3 5 7 10 R L= 6Ω 2 3 5 7 100 3 Output power, PO -- W/CH No.6632-7/8 R L= 4Ω LA4628 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.6632-8/8