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Ordering number: EN1339D
Monolithic Linear IC
LA4145 0.6 to 0.9 W AF Power Amplifier for Radio Cassette Recorders
Features
Package Dimensions
unit : mm
. The LA4145 is especially suited for use in cassette tape . . . . .
recorder, radio-cassette, recorder, stereo cassette player applications. 0.6 W typ/VCC = 6.0 V, RL = 8 , THD = 10% 0.9 W typ/VCC = 6.0 V, RL = 4 , THD = 10% Minimum number of external parts required Soft clip Small pop noise at VCC ON/OFF mode Voltage gain fixed at 50 dB. An external resistor can be connected to reduce this value.
3017C-SIP9
[LA4145]
SANYO : SIP9
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 50 × 50 mm2 with PCB Quiescent mode Operating mode RL = 8 Conditions Ratings 9 8 500 0.9 20 to +70 40 to +150 Unit V V mA W °C °C
Operating Conditions at Ta = 25°C
Parameter Recommended supply voltage Recommended load resistance Operating voltage range Symbol VCC RL VCC Conditions Ratings 6 4 to 8 3.6 to 8 Unit V V
Operating Characteristics at Ta = 25°C, VCC = 6.0 V, RL = 8 , Rg = 600 , f = 1 kHz
Parameter Quiescent current Voltage gain Output power Total harmonic distortion Input resistance Output noise voltage Ripple rejection ratio Symbol ICCO VG PO THD ri VNO SVRR Conditions LA4145 48 THD = 10%, RL = 4 THD = 10%, RL = 8 PO = 0.1 W Rg = 10 k, B.P.F. = 20 Hz to 20 kHz Rg = 0, fR = 100 Hz, VR = 150 mV 0.45 min typ 10 50 0.9 0.6 0.2 30 0.6 40 max 20 52 Unit mA dB W W % k mV dB
1.0 1.2
35
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53096HA(II)/O217KI/N055MW/4034/N163KI,TS No.1339-1/5
LA4145
Proper care in changing voltage gain
An external resistor can be connected in series with the feedback capacitor at pin 2 to reduce the voltage gain. (See RNF-VG characteristic.)
IC usage notes
1. Maximum ratings If the IC is used in the vicinity of the maximum ratings, even a slight variation in conditions may cause the maximum ratings to be exceeded, thereby leading to breakdown. Allow an ample margin of variation for supply voltage, etc. and use the IC in the range where the maximum ratings are not exceeded. Pin-to-pin short If power is applied when the space between pins is shorted, breakdown or deterioration may occur. When mounting the IC on the board or applying power, make sure that the space between pins is not shorted with solder, etc. Radio applications For use in radio applications, keep a good distance between IC and bar antenna. Printed circuit pattern When designing the printed circuit pattern, make the power supply, output, and ground lines thicker and shorter and determine the pattern and parts placement so that no feedback loop is formed between input and output. Place power capacitor C6, oscillation blocking capacitor C3 as close to the IC pin as possible to prevent oscillation from occurring. (See the sample printed circuit pattern.)
2.
3. 4.
Description of external parts
C1 (47 µF) Feedback capacitor (NF capacitor) Low cutoff frequency fLdepends on this capacitor. fL = 90 Hz for C1 = 47 µF. Decreasing the capacitor value makes the starting time earlier.
C2 (100 µF) C3 (0.15 µF) C4 (470 µF) C5 (47 µF) C6 (470 µF) R1 (30 k)
Bootstrap capacitor Oscillation blocking capacitor Output capacitor Decoupling capacitor Power capacitor Input bias resistor Serves to reject ripple. The starting time depends on this capacitor. Increasing the capacitor value makes the starting time later. Place as close to the power pin of the IC as possible. Serves to apply input bias. The input impedance almost entirely depends on this resistor value. If a variable resistor also serves for this purpose, this resistor can be omitted. In this case, it is recommended to use a resistor of 30 k. It is recommended to use a polyester film capacitor being good in temperature characteristic, high frequency characteristic.
Allowable power dissipation, Pd max - mW
Pd max - Ta
50 × 50 mm2 PCB
Ambient temperature, Ta °C
No.1339-2/5
LA4145
Sample Application Circuit: AF power amplifier
Sample Printed Circuit Pattern (Cu-foiled area)
+
VCC +C6 470µF
C5 47µF
9
LA4145
1
INPUT
+
C2 100µF R1 30k OUTPUT C4 470 µF C3 0.15µF polyester film capacitor
C1 47µF
42.5 × 70.0mm 2
ICCO - VCC Quiescent current, ICCO - mA
PO - VCC
Output power, PO - W
Supply voltage, VCC - V
Supply voltage, VCC - V
No.1339-3/5
LA4145
THD - PO Allowable power dissipation, Pd - W Total harmonic distortion, THD - % Pd - PO
Output power, PO - W Pd - PO Allowable power dissipation, Pd - W
Output power, PO - W VG - f
Output power, PO - W VNO Rg Total harmonic distortion, THD % Output noise voltage, VNO mV
Voltage gain, VG - dB
Frequency, f - Hz THD f
B.P.F.= 20Hz to 20kHz
Without B.P.F.
With B.P.F.
Signal source resistance, Rg SVRR VG Output noise voltage, VNO mV
Frequency, f - Hz VNO VG
B.P.F.= 20Hz to 20kHz
SVRR dB
Without B.P.F.
With B.P.F.
Voltage gain, VG dB
Voltage gain, VG dB No.1339-4/5
LA4145
VG RNF Output noise voltage, VNO mV VNO VCC
B.P.F.=20Hz to 20kHz
Voltage gain, VG dB
External feedback resistor, RNF tS C1, C5
Supply voltage, VCC V tS VCC
Starting time tS s
Starting time, ts s
Complete discharge
Complete discharge
C1, C5 µF ICCO - Ta Quiescent current, ICCO mA
Supply voltage, VCC V PO Ta
Ambient temperature, Ta °C
Output power, PO W
Ambient temperature, Ta °C
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.1339-5/5