LA4525

Ordering number: EN4022C Monolithic Linear IC LA4525 Dual AF Power Amplifier for Radio Cassette Recorders Overview The LA4525 requires only a small number of external components to drive either two 4 Ω speakers or one 8 Ω speaker. The output power is typically 0.65 W when driving two 4 Ω speakers. Package Dimensions unit : mm 3001B-DIP8 [LA4525] Features . Two-channel (dual) or single-channel (BTL) operation . Requires only a few external components. . 0.65 W (typ) output power into two 4 Ω speakers . Wide power supply range: 3 to 15 V . 8-pin DIP (No heat sink needed) SANYO : DIP8 Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Pd max Topr Tstg Rg = 0 Note Conditions Ratings 15 1.5 –25 to +75 –40 to +150 Unit V W °C °C Note: Mounted on a 50 × 50 × 1.6 mm3 heat dissipating board Recommended Operating Conditions at Ta = 25°C Parameter Supply voltage Load resistance range Supply voltage range Symbol VCC RL VCC op Not in excess of package Pd Conditions Ratings 6 4 3 to 15 Unit V Ω V SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 32896HA(II)/D0192TS/4162TS No.4022-1/8 LA4525 Operating Characteristics at VCC = 6 V, Ta =25°C, RL = 4 Ω, f = 1 kHz, Rg = 600 Ω, Dual operation unless otherwise noted Parameter Quiescent supply current Output power Voltage gain Total harmonic distortion Output noise voltage Supply voltage ripple rejection Channel separation Input resistance Symbol ICCO PO1 PO2 VG THD VNO SVRR CH Sep Ri Condition Rg = 0 Ω THD = 10% VCC = 9 V, RL = 8 Ω, THD = 10% VO = 0 dBm PO = 0.1 W Rg = 0 Ω, DIN AUDIO filter Rg = 0 Ω, fR = 100 Hz, VR = 0 dBm VO = 0 dBm, Rg = 0 Ω min 10 0.45 38 typ 15 0.65 1.0 40 0.2 100 43 55 100 max 30 Unit mA W W dB % µV dB dB kΩ 42 0.7 400 35 45 70 130 Equivalent Block Diagram IN2 BTL IN Ch2 input amp. Predriver amp. Output amp. OUT2 PRE GND POWER GND IN1 Ch1 input amp. Predriver amp. Output amp. OUT1 Pin Description Number 1 2 3 4 5 6 7 8 Name OUT1 VCC OUT2 POWER GND BTL IN IN2 IN1 PRE GND Channel 1 output Supply voltage Channel 2 output Power amplifier ground Bridge test load input Channel 2 input Channel 1 input Preamplifier ground Description No.4022-2/8 LA4525 Allowable power dissipation, Pd max − W Mounted on Sanyo recommended board Independent IC Ambient temperature, Ta − °C Dual Operation Unit (capacitance:F) Sample Printed Circuit Pattern Unit (capacitance:F) 65 × 65mm2 (Cu-foiled area) No.4022-3/8 LA4525 External Components Comparison External components Output capacitors Input capacitors Bootstrap capacitors Feedback capacitors Filter capacitors Oscillation damping mylars Dual-mode operation total Existing Sanyo ICs • • • • • • 11 LA4525 • • × × × × 4 Pin Voltages Pin number 1 2 3 4 5 6 7 8 Pin name OUT1 VCC OUT2 POWER GND BTL IN IN2 IN1 PRE GND Pin voltage 2.8 V 6V 2.8 V 0V 65 mV 1.4 V 1.4 V 0V Supply voltage, VCC − V Total harmonic distortion, THD − % Quiescent current, ICCO − mA Output pin voltage, VN − V Supply voltage, VCC − V Output power, PO − W Input voltage, VIN − mV Total harmonic distortion, THD − % Output power, PO − W Frequency, f − Hz Output power, PO − W No.4022-4/8 Power dissipation, Pd − W Current drain, ICC − mA Output noise voltage, VNO − mV Frequency response − dB Current drain, ICC − mA Output power, PO − W Frequency, f − Hz Signal source resistance, Rg − Ω Ripple rejection, SVRR − dB Channel separation, CH sep − dB Supply voltage, VCC − V Frequency, f − Hz Power dissipation, Pd − W Output power, PO − W LA4525 Ripple frequency, fR − Hz No.4022-5/8 LA4525 Rising and falling waveforms Speaker terminals Output DC locus BTL Operation Unit (resistance: Ω, capacitance:F) Total harmonic distortion, THD − % Output power, PO − W Output power, PO − W Supply voltage, VCC − V No.4022-6/8 LA4525 Frequency, f − Hz Output power, PO − W Handling Instructions and Precautions Internal Circuits Driver Power Driver Unit (resistance: Ω) Figure 1. Input pins (6 and 7) and BTL input pin (5) Power Figure 2. Output pins (1 and 3) No.4022-7/8 Power dissipation, Pd − W Frequency response − dB Current drain, ICC − mA LA4525 External Components . The output capacitors can be replaced with a single 220 µF bipolar capacitor. A larger value can cause switching noise when power is applied to the device. The voltage gain is fixed internally to 40 dB in dual mode and 46 dB in BTL mode. These values cannot be altered by connecting external components. Phase correction capacitance (600 pF/TOTAL) is incorporated in the internal stages. Oscillation damping components (R and C) are also incorporated in the output pin circuits. Power consumption Note that the 8-pin DIP does not have a heat dissipating surface and that the power dissipation ratings are critical. The maximum power dissipation of the device is 1.25 W, and 1.5 W when the device is mounted on the recommended PCB. The actual power dissipated depends on the supply voltage and the load conditions. Ensure that the device is kept within its maximum rating. For AC supplies, transformer tappings may need to be adjusted to keep the device within maximum ratings. VCC2 Pd max = + ICCO × VCC π2RL Note For BTL mode operation, the value of RL used in the calculation should be 1/2 the actual value. . The starting time, t , can be varied by changing the value of s the input capacitor. A value of 2.2 µF is recommended. A smaller value will result in a lower starting time, and a larger value, a higher starting time. . . . . The output capacitor should have a value of 470 µF. A lower . . value will cause the low-frequency roll-off and low-power characteristics to deteriorate. A value of 470 µF is recommended for the power supply capacitor, although this can change according to the design setup conditions. In dual mode, BTL IN (the channel 2 negative feedback connection) should be left floating. BTL mode . The output capacitors should have a value of 470 µF. If these are omitted, a ‘‘popping’’ noise occurs. Also, any output offset will cause a current to flow which could damage the load under quiescent DC conditions. . If the speaker plug jacks short to ground when connected, a the . protection resistor shouldatbeorinserted inrated output line. If the device is operated near its values, these . . values can be exceeded by small changes in operating conditions, leading to device breakdown. Accordingly, ensure that a safety margin is maintained so as not to exceed the maximum ratings. Check the PCB surface after soldering to ensure that no pins have been accidentally shorted. Any short between pins could cause poor operating characteristics or permanently damage the device when power is applied. If making the PCB, check the printed wiring to ensure that no feedback loops occur between input and output. RL 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 March, 1996. Specifications and information herein are subject to change without notice. No.4022-8/8