Ordering number : EN4090C Monolithic Linear IC LA4450 Two Channel Power IC for Bus or Track Use in TV and Home Audio Applications Overview Package Dimensions The LA4450 is a single package two channel power IC that supports an operating voltage of 26 V. It is particularly well suited for use as the bus or track power IC in car stereo applications. Additionally, since the LA4450 can drive 4 Ω loads, it can be used effectively in highpower high-end products. Furthermore, since it supports a high operating voltage and has low distortion, it is also optimal for use in TV and home audio products. unit: mm 3023A-SIP14H [LA4450] Functions • • • • Standby switch (active on high (+5 V) input) On-chip impulse noise protection circuit On-chip thermal protection circuit On-chip overvoltage and surge protection circuits SANYO: SIP-14H Features • • • • • • Two channels in a single package PO = 12 W × 2 (VCC = 26.4 V, RL = 8 Ω, THD = 10%) PO = 20 W × 2 (VCC = 26.4 V, RL = 4 Ω, THD = 10%) Can drive 4 Ω speakers Built-in standby switch Minimizes impulse noises Specifications Maximum Ratings at Ta = 25°C Parameter Symbol Maximum supply voltage VCC max Maximum output current IO peak Allowable power dissipation Pd max* Conditions Ratings Rg = 0 (no signal) Infinite heat sink Unit 37 V 4 A 25 W Operating temperature Topr –35 to +80 °C Storage temperature Tstg –40 to +150 °C Ratings Unit Note: * Set VCC and RL within ranges that do not cause Pd max to exceed 25 W. (When VCC is 37 V, RL should be 6 Ω or larger and when VCC is 35 V, RL should be 4 Ω or larger.) Operating Conditions at Ta = 25°C Parameter Symbol Recommended supply voltage VCC Recommended load resistance RL Operating supply voltage range VCCop Conditions 26.4 V 8 Ω 10 to 30 V SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 43098HA (OT)/10794TS B8-0618/1102 No. 4090-1/7 LA4450 Operating Characteristics at Ta = 25°C, VCC = 26.4 V, RL = 8 Ω, f = 1 kHz, Rg = 600 Ω Ratings Parameter Standby current Quiescent current Output power Voltage gain Symbol Ist Conditions min typ Standby switch off ICCO Rg = 0 50 10 PO1 THD = 10% PO2 THD = 10%, RL = 4 Ω VG VO = 0 dBm 49 Total harmonic distortion THD PO = 1 W Output noise voltage VNO Rg = 0, BPF-BW = 20 Hz to 20 kHz 1 30 µA 140 mA 12 W 20 W 51 53 0.07 0.4 % 0.4 1.0 mV Ripple exclusion ratio SVRR Rg = 0, fR = 100 Hz, VR = 0 dBm 45 55 CHsep VO = 0 dBm, Rg = 10 kΩ 45 55 With a 10 kΩ resistor connected at pin 12 2.5 Vst dB dB dB VCC V θf – Sf Pd max – Ta Heat sink thermal resistance, θf – °C/W Allowable power dissipation, Pdmax – W Unit 80 Channel separation Standby control voltage max Ambient temperature, Ta – °C Heat sink surface area, Sf – cm2 No. 4090-2/7 LA4450 Test Circuit Unit (resistance : Ω, capacitance : F) 1. Features and Usage Notes • Pin 12 is the standby pin. The IC operates when a voltage of 2 V or higher is applied through the external resistor R1. Note that the maximum influx current to pin 12 is 500 µA. • Changing the voltage gain The voltage gain VG can be lowered by connecting an external resistor in series between the NF pin (pins 8 and 14) and CNF. VG = 20 log 30 kΩ 75 + RNf’ However, since the IC may oscillate if VG is 30 dB or lower, use a VG of 36 dB or higher. • The LA4450 includes a thermal protection circuit to prevent damage to or destruction of the IC due to abnormal overheating. As a result, the output may be attenuated or cut off if the application heat sinking is inadequate. • The LA4450 includes an overvoltage protection circuit to protect the IC against power supply surges and abnormal voltages. This circuit has hysteresis characteristics: it operates at between 39 and 40 V, and recovers at around 34 V. • Although the LA4450 includes a current limiter circuit to prevent damage due to abnormal currents, care must still be exercised to prevent load shorts and other excessive current conditions. No. 4090-3/7 LA4450 Sample Application Circuit Unit (resistance : Ω, capacitance : F) No. 4090-4/7 LA4450 Printed Circuit Board Pattern Example C opper foiled side 90 × 100 mm2 PO – VCC Output power, PO – W Output power, PO – W PO – VCC THD – PO THD – PO Total harmonic distortion, THD – % Supply voltage, VCC – V Total harmonic distortion, THD – % Supply voltage, VCC – V Output power, PO – W Output power, PO – W No. 4090-5/7 LA4450 No. 4090-6/7 LA4450 ■ 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: ➀ 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: ➁ 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 April, 1998. Specifications and information herein are subject to change without notice. No. 4090-7/7