LA4631/D. Functions 2-channel power amplifier for audio applications. Specifications

Transcription

1 Ordering number : EN8B LA Monolithic Linear IC For Audio Applications W -Channel AF Power Amplifier Overview The LA (W channels) is a single-ended power amplifier that has a pin arrangement similar to the LA BTL power amplifier (W channels). The LA's pin compatibility makes it possible to share a common printed circuit board among a series of end products differentiated by power rank. (Note that the LA is provided in an SIP-H package, and that it is necessary to provide a hole for the LA pin if the same printed circuit board is to be shared. Note also that certain external components differ.) Functions -channel power amplifier for audio applications Specifications Maximum Ratings at Ta = C Parameter Symbol Conditions Ratings Unit Maximum supply voltage V CC max With no input signal V Maximum output current I O peak Per channel A Allowable power dissipation Pd max With an infinitely large heat sink W Maximum junction temperature Tj max C Operating temperature Topr - to C Storage temperature Tstg - to C Operating Conditions at Ta = C Parameter Symbol Conditions Ratings Unit Recommended supply voltage V CC V Recommended load resistance range R L op Ω Allowable operating supply voltage range V CC op. to V *: V CC, R L, and the output level must be set for the size of the heat sink used so that the Pd max range is not exceeded., SCILLC. All rights reserved. Publication Order Number: Jan-, Rev. LA/D

2 LA Electrical Characteristics at Ta = C,,, f = khz, Rg = Ω Ratings Parameter Symbol Conditions min typ max Unit Standby current Ist VSTB = V μa Quiescent current drain I CCO Rg =, VSTB = V 8 8 ma Standby pin applied voltage Vst The pin voltage such that the amplifier is on. V Output power P O THD = % W Total harmonic distortion THD V O = W.. % Voltage gain VG V O = dbm db Output noise voltage (rms) V NO Rg =, BPF = Hz to khz.. mvrms Supply voltage rejection ratio SVRR Rg =, f R = Hz, V CC R = dbm db Channel separation CHsep Rg = kω, V O = dbm db Input resistance Ri kω Package Dimensions unit : mm (typ) B Allowable power dissipation, Pd max -- W With an infinitely large heat sink.mm.mm Without a heat sink Pd max -- Ta Aluminum heat sink Tightening torque : 9N cm With silicone grease applied jc = C/W - 8 Ambient temperature, Ta -- C Rev. Page of

3 LA Block Diagram Application Circuit Example LA Ripple Filter IN PRE PWR GND IN Standby P.P V CC OUT NC GND NC OUT NC 8 9 C μf V C μf V C μf V C.μF V C μf V C μf V VSTB V C μf V R L R L Top view V CC Rev. Page of

4 LA External Components and Usage Notes C, C : These are input coupling capacitors; we recommend a value of μf or lower. The LA input pin potential is about.v, and the polarity must be considered due to the DC potential of the circuits connected to the LA front end. The amplifier's startup time (the time from the point power is first applied until the point an output is generated) will change proportionally with the values of these input capacitors. (When μf capacitors are used, the startup time will be about. seconds.) C : This capacitor is used as a ripple filter. We recommend a value of μf. Amplifier impulse noise when turned off (when the standby pin goes low) may be made worse if a value under μf is used. The pin voltage is about /VCC. A DC mute function can be applied if pin is connected to ground through a to Ω resistor. Note that the muting activation voltage will be too low if a resistor value of Ω or higher is used. C : This is an impulse noise prevention capacitor. The recommended value is.μf. If a value of.μf or lower is used for C, impulse noise when the amplifier is turned off (when the standby pin goes low) may be made worse. Also, if a value of μf or higher is used, an "incomplete muting" phenomenon may occur when the amplifier is turned off (when the standby pin goes low). C : Power supply capacitor. This capacitor should be located as close as possible to the IC (to minimize increases in the power supply line impedance) to achieve stable amplifier operation. C, C : Output capacitors. These capacitors influence the amplifiers low band frequency characteristics. (fc = /πcout RL) fc = low band cutoff frequency, Cout = C, C Caution Although the LA is basically pin compatible with the LA, there are certain differences in the external components and the way the devices are used. (Reference) Pin IC internal equivalent circuit Rx Ix STBY R k Standby applied voltage Vx Ix=max.mA R k The amplifier can be turned on or off by controlling the high/low state of pin. The amplifier is turned on by applying a voltage of.v or higher or an influx current of 8μA or higher. (If a V level is applied directly to pin, the pin influx current will be about.ma.) If a voltage, Vx, that exceeds V will be applied, insert a current limiter resistor (Rx) so that the influx current does not exceed.ma. (See the formula below.) Rx = (Vx V)/.mA When pin is controlled by a microcontroller, to set up a pin influx current (Ix) optimal for the drive capacity of the microcontroller, calculate Rx from the following formula as a first approximation and measure the influx current to verify that level. Rx = (Vx/Ix) R (kω) *: When a voltage is applied to the standby pin (pin ), refer to the above and insert a resistor (Rx) to limit the influx current if required. Rev. Page of

5 LA Quiescent current, I CCO -- ma Rg = ICCO -- VCC Output power, P O -- W 9 8 Rg = Ω fin = khz THD = % PO -- VCC RL = 8Ω Total harmonic distortion, THD -- % Supply voltage, VCC -- V Supply voltage, VCC -- V THD -- PO THD -- f Rg = Ω Rg = Ω Filter : FLAT PO = W Filter : FLAT. f = khz f = khz f = Hz Total harmonic distortion, THD -- %. Response -- db... Output power, PO -- W Response -- f Rg = Ω - VO = dbm Output power, P O -- W. k k k PO -- f THD = % Rg = Ω THD = % - - Channel separation, CHsep -- db -8 k k k CHsep -- f - Rg = kω CH CH Output noise voltage, VNO -- mvrms k k k VNO -- Rg... - k k k k k Signal source resistance, Rg -- Ω Rev. Page of

6 LA Supply voltage rejection ratio, SVRR -- db SVRR -- VCC RL = Rg = fr = Hz VCCR = dbm Supply voltage rejection ratio, SVRR -- db SVRR -- fr RL = Rg = VCCR = dbm Supply voltage rejection ratio, SVRR -- db Supply voltage, VCC -- V SVRR -- VCCR RL = Rg = fr = Hz SVRR = log(vo/vccr) VCCR -- Vrms - k k fr -- Hz ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. SCILLC strives to supply high-quality high-reliability products and recommends adopting safety measures when designing equipment to avoid accidents or malfunctions. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. Typical parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including Typicals, must be validated for each customer application by customer s technical experts. SCILLC shall not be held liable for any claim or suits with regard to a third party s intellectual property rights which has resulted from the use of the technical information and products mentioned above. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box, Denver, Colorado 8 USA Phone: -- or 8--8 Toll Free USA/Canada Fax: -- or 8--8 Toll Free USA/Canada orderlit@onsemi.com N. American Technical Support: Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 9 9 Japan Customer Focus Center Phone: ON Semiconductor Website: Order Literature: For additional information, please contact your local Sales Representative LA/D