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Ordering number: EN887B
Monolithic Linear IC
LA4183 2.3 W 2-Channel AF Power Amplifier for Radio Cassette Players
Features
Package Dimensions
unit : mm
. Built-in 2 channels enabling use in stereo and bridge . amplifier (BTL) applications. High-output: . . . . . . .
2.3 W typ./channel, VCC = 9 V, RL = 4 4.7 W typ./bridge amplifier, VCC = 9 V, RL = 8 Low switching distortion at high frequencies. Minimum number of external parts required: 9 pcs. min. (Stereo/bridge). Small shock noise at the time of power supply ON/OFF due to built-in muting circuit. Good ripple rejection due to built-in ripple filter. Soft tone at the time of output saturation. Good channel separation. Voltage gain fixed at 45 dB (Bridge: 51 dB). Variable voltage gain available with external resistor added.
3022A-DIP12F
[LA4183]
SANYO : DIP12F Note: In general applications, heat generated in the DIP 12-pin package can be radiated through the Cu-foiled area of the printed circuit board, but since power dissipation Pd may be increased depending on the supply voltage and load conditions, it is recommended to use a fin additionally.
Specifications
Maximum Ratings at Ta = 25°C
Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Pd max Topr Tstg With signal Quiescent With printed circuit board (Refer to Pd Ta characteristics) Conditions Ratings 11 15 4 20 to +75 55 to +150 Unit V V W °C °C
Operating Conditions at Ta = 25°C
Parameter Recommended supply voltage Load resistance Symbol VCC RL Stereo Bridge Conditions Ratings 9.0 4.0 to 8.0 8.0 Unit V
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53096HA(II)/O0207TA/2022KI,TS,ID No.887-1/11
LA4183
Operating Characteristics at Ta = 25°C, VCC = 9.0 V, f = 1 kHz, Rg = 600 , RL = 4 , ( See specified Test Circuit.
Parameter Quiescent current Voltage gain Voltage gain difference Output power Symbol ICCO VG VG PO THD ri VNO -- CHsep Rg Rg Rg Rg = = = = 0 10 k 0, Vr = 150 mV 10 k, VO = 0 dBm Stereo Stereo Stereo Stereo THD = 10% Conditions For stereo Closed loop, VIN = 45 dB Stereo Bridge Stereo Stereo Bridge Stereo Bridge 21 43 49 1.7 min typ 40 45 51 2.3 (1.3) (4.7) 0.3 0.5 30 0.3 0.5 46 55
): 8 ,
max 55 47 53 ±1 Unit mA dB dB dB W W W % % k mV mV dB dB
Total harmonic distortion Input resistance Output noise voltage Ripple rejection ratio Channel separation
PO = 250 mW
1.5
1.0 2.0
40 40
Allowable power dissipation, Pd max W
Pd max Ta
Cu plate (fin 1) Fe plate (fin 1) Fe plate (fin 2)
Recommended printed circuit board only Cu-foiled area reduced board
IC only
Ambient temperature, Ta °C
Pin Assignment and Equivalent Circuit
No.887-2/11
LA4183
Sample Application Circuit 1: Stereo amplifier
Sample Application Circuit 2: Bridge amplifier
Example of printed circuit pattern (Cu-foiled area) for use in stereo, bridge amplifier applications
60 × 80 mm2
C7 OUT1 C3 100µF /16V IN1 C1 100µF/16V C2 100µF/16V BTL use 100µF /16V IN2 7 LA4183 6 C9 100µF/16V 1 C6 0.15µF C4 100µF/16V OUT2 12 GND 470µF /16V V CC C5 0.15µF
C10 1000µF jumper /16V 2ch stereo use
BTL OUT
C8 470µF/16V
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LA4183
Description of External Parts
C1 (C2) Feedback capacitor The low-range cut-off frequency is determined by the following formula: fL = 1 / (2 C1vRf), fL: Low-range cut-off frequency Rf: Feedback resistor (50 embedded + Rf externally connected) The frequency, however, affects the starting time in conjuction with decoupling capacitors. Therefore, it is necessary to determine it after a full review of the required low-frequency range and other similar conditions. The output at low frequencies depends on this capacitor. If the capacity is decreased, the output at low frequencies goes lower. 47 µF min. is required. Use polyester film capacitor which is good in temperature characteristic and frequency characteristic. Aluminum electrolytic capacitor or ceramic capacitor causes oscillation at low temperatures. The low-range cut-off frequency is determined by the following formula. fL = 1 / (2 C7vRL), fL: Low-range cut-off frequency RL:Load resistance When using bridge-connected, double the capacitance to obtain equivalent low-range frequency characteristics to those in a 2-channel application. Used for the ripple filter. Since the rejection effect is saturated at a certain capacity, it is meaningless to increase the capacity more than needed. This capacitor, being also used for the time constant of the muting circuit, affects the starting time.
C3 (C4)
Bootstrap capacitor
C5 (C6)
Oscillation preventing capacitor
C7 (C8)
Output capacitor
C9
Decoupling capacitor
C10
Power source capacitor
Application Circuits
1. Voltage gain adjustment The voltage gain depends on built-in-resistors R1 (R2), R3 (R4) as follows: R3 (R4) [dB] R1 (R2) If the IC is used at a voltage gain less than this, the following equation with Rf added applies. VG = 20 log VG = 20 log R3 (R4) [dB] R1 (R2) + Rf
. Stereo
where R1 (R2) = 50 typ., R3 (R4) = 10 k typ.
. Bridge
The following shows the bridge amplifier configuration, where ch1 operates as a non-inverting amplifier and ch2 as an inverting amplifier.
No.887-4/11
LA4183
The output of ch1 is divided with R5, R6 and led to pin 1 and then inputted to ch2. Since the attenuation degree (R5/R6) of ch1 output and the amplification degree (R4/R2 + R6)) of ch2 are fixed at an equal value, the ch2 output is in opposite phase with the ch1 output. Therefore, the total voltage gain gets apparently 6 dB higher than the voltage gain of ch1 alone and is determined by the following equation. R3 + 6 [dB] R1 If the IC is used at a voltage gain less than this, the following equation with Rf added applies. VG = 20 log VG = 20 log 2. Starting time R3 R1 + Rf + 6 [dB]
Starting time depends on capacitance of C1 (C2) and C9 as shown in the diagram below. That is because of using a muting circuit utilizing the C9 (decoupling capacitor) time constant for pop noise prevention when power is turned on and charging circuits for C1 and C2 (NF capacitors).
Quiescent
Dependence on C9
Quiescent
Dependence on C1 (C2) 3. Crosstalk
Channel separation characteristic is important for single-package IC embodying two channels. With LA4183, good channel separation is obtainable even as is, but if the BTL OUT pin (pin 1) is not grounded, it will invite imbalance in crosstalk between the two channels. (Refer to the characteristics diagram.)
No.887-5/11
LA4183
Proper Cares in Operating a Set with LA4183 Incorporated
When a set with the LA4183 incorporated is operated from AC power supply, a momentary drop in supply voltage is caused by the transformer regulation, etc. at the time of turning ON the motor with the circuit shown below. In this case, if ripple noise is generated from the speaker or headphone, take the following actions. 1. 2. Connect a diode (rectifier diode of average rectified current IO = 100 to 200 mA) across pins 6 and 12 of the LA4183 so that the voltage at pin 6 can follow the supply voltage regulation. In the steady state, this diode is cut off. Increase the capacity of the power source capacitor so that the supply voltage regulation can be minimized.
Radiation Design
. Since the DIP 12-pin package is so designed as to be able to radiate heat through the Cu-foiled area of printed circuit board . . .
under normal operating conditions, make the Cu-foiled area near the fin of IC as large as possible when designing the printed circuit board. By providing the Cu-foiled area covered by the broken line as shown in the above-mentioned example of printed circuit pattern, a rather satisfactory radiation is enabled. (Refer to the Pd - Ta characteristics.) Since the power dissipation (Pd) goes higher depending on the conditions of supply voltage and load, it is recommended to use the fin together with the printed circuit board. The following equations are rule-of-thumb guides for Pd (for stereo). For AC power supply, it is desirable to measure with the transformer of each individual set. In the bridge amplifier application, calculation should be made with 1/2 of the load used.
(1) DC Power supply VCC2 Pd max = 2R + ICCO v VCC (For stereo) L (2) AC power supply VCC (Pd)2 + ICCO v VCC (Pd) (For stereo) Pd max = 2RL VCC2: ICCO: Quiescent supply voltage Quiescent current
VCC (Pd): Supply voltage at Pd max. output, VCC (Pd) = 1+ VCC1: (1 + r) VCC1 r v VCC1 2 v v RL ×
RL PO max
Supply voltage at max. output VCC2 VCC1 VCC1
r: Voltage regulation,
. Example of fin mounting
The fin is formed into such a shape as to be able to radiate heat from the plastic area of IC and the fin as shown below and is soldered to the printed circuit board. For the fin size, refer to the Pd Ta characteristics. The desirable material is copper or iron which is solderable. It is recommended to apply silicone grease, etc. to the plastic area of IC in order to minimize the thermal resistance.
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LA4183
Printed circuit board
Example of fin mounting Fin
IC Usage Notes
1. If the IC is used in the vicinity of the maximum rating, even a slight variation in conditions may cause the maximum rating to be exceeded, thereby leading to a breakdown. Allow an ample margin of variation for supply voltage, etc. and use the IC in the range where the maximum rating is not exceeded. Pin-to-pin short If the supply voltage is applied when the space between pins is shorted, a breakdown or deterioration may occur. When installing the IC on the board or applying the supply voltage, make sure that the space between pins is not shorted with solder, etc. Load short If the IC is used with the load shorted for a long time, a breakdown or deterioration will occur. Be sure not to short the load. When the IC is used in radios or radio cassette tape recorders, keep a good distance between IC and bar antenna. When making the board, refer to the example of printed circuit pattern.
2.
3. 4. 5.
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LA4183
PO VIN f response
Output power, PO W
Response dB
Input voltage, VIN mV THD PO Total harmonic distortion, THD % Total harmonic distortion, THD %
Frequency, f Hz THD f
Total harmonic distortion, THD %
Output power, PO W THD f Total harmonic distortion, THD % Output noise voltage, VNO mV
Frequency, f Hz VNO, THD, fH VG High cutoff frequency, fH kHz
VNO (Rg = 0, no filter)
VNO (Rg = 0.20 to 20kHz BPF)
(With signal) (With noise)
Frequency, f Hz CHsep f Channel Separation, CHsep dB Output noise voltage, VNO mV Output ripple voltage, Vrp mV
Voltage gain, VG dB Vrp, VNO Rg
(Signal side)
Frequency, f Hz
Signal source resistance, Rg No.887-8/11
LA4183
THD Rg Total harmonic distortion, THD % Output ripple voltage, Vrp mV Vrp CDC
ripple
Signal source resistance, Rg Vrp CNF Output ripple voltage, Vrp mV Output ripple voltage, Vrp mV
No difference due to bootstrap capacitors 47 µF, 100 µF, 200 µF.
Decoupling capacitor capacity, CDC µF Vrp fr
Feedback capacitor capacity, CNF µF VG RNF Total harmonic distortion, THD %
Ripplie frequency, fr Hz THD VCC
Voltage gain, VG dB
Measured value
External feedback resistor resistance, RNF tS CDC Power dissipation, Pd (Stereo) W
Output DC waveform
Power ON
Supply voltage, VCC V Pd PO
Using specified fin
Starting time, ts s
Decoupling capacitor capacity, CDC µF
Output power, PO W No.887-9/11
LA4183
Pd PO Power dissipation, Pd (Stereo) W
Using specified fin
ICC PO
Output power, PO W PO VCC
Current drain, ICC mA
Output power, PO W PO RL
Output power, PO W
Output power, PO W
Quiescent current, ICCO mA (Stereo)
Quiescent current, ICCO mA (Stereo)
Supply voltage, VCC V ICCO, VN VCC Output midpoint voltage, VN V
Load resistance, RL ICCO Ta
Supply voltage, VCC V VN Ta Output midpoint voltage, VN V
[Bridge]
Ambient temperature, Ta °C PO VIN
Ambient temperature, Ta °C
Output power, PO W
Input voltage, VIN mV No.887-10/11
LA4183
f response Total harmonic distortion, THD % THD PO
Response dB
Frequency, f Hz THD f Total harmonic distortion, THD %
Output power, PO W Pd PO
Power dissipation, Pd W Frequency, f Hz ICC PO
Using specified fin
Output power, PO W PO VCC
Current drain, ICC mA
Output power, PO W
Output power, PO W
Supply voltage, VCC V
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: 1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: 2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of May, 1996. Specifications and information herein are subject to change without notice.
No.887-11/11