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Ordering number : EN4090C
Monolithic Linear IC
LA4450
Two Channel Power IC for Bus or Track Use in TV and Home Audio Applications
Overview
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 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.
Package Dimensions
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 x 2 (VCC = 26.4 V, RL = 8 , THD = 10%) PO = 20 W x 2 (VCC = 26.4 V, RL = 4 , THD = 10%) Can drive 4 speakers Built-in standby switch Minimizes impulse noises
Specifications
Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Maximum output current Allowable power dissipation Operating temperature Storage temperature Symbol VCC max IO peak Pd max* Topr Tstg Infinite heat sink Rg = 0 (no signal) Conditions Ratings 37 4 25 -35 to +80 -40 to +150 Unit V A W C C
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 or larger and when VCC is 35 V, RL should be 4 or larger.)
Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Recommended load resistance Operating supply voltage range Symbol VCC RL VCCop Conditions Ratings 26.4 8 10 to 30 Unit V 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 = 25C, VCC = 26.4 V, RL = 8 , f = 1 kHz, Rg = 600
Ratings Parameter Standby current Quiescent current Output power Voltage gain Total harmonic distortion Output noise voltage Ripple exclusion ratio Channel separation Standby control voltage Symbol Ist ICCO PO1 PO2 VG THD VNO SVRR CHsep Vst Conditions Standby switch off Rg = 0 THD = 10% THD = 10%, RL = 4 VO = 0 dBm PO = 1 W Rg = 0, BPF-BW = 20 Hz to 20 kHz Rg = 0, fR = 100 Hz, VR = 0 dBm VO = 0 dBm, Rg = 10 k With a 10 k resistor connected at pin 12 45 45 2.5 49 50 10 min typ 1 80 12 20 51 0.07 0.4 55 55 VCC 53 0.4 1.0 max 30 140 Unit A mA W W dB % mV dB dB V
Pd max - Ta
Allowable power dissipation, Pdmax - W
f - Sf
Ambient temperature, Ta - C
Heat sink thermal resistance, f - C/W
Heat sink surface area, Sf - cm2
No. 4090-2/7
LA4450
Test Circuit
Unit (resistance : , 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 A. * 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 k 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 : , capacitance : F)
No. 4090-4/7
LA4450
Printed Circuit Board Pattern Example
C opper foiled side 90 x 100 mm2
PO - VCC
PO - VCC
Output power, PO - W
Supply voltage, VCC - V
Output power, PO - W
Supply voltage, VCC - V
THD - PO
THD - PO
Total harmonic distortion, THD - %
Output power, PO - W
Total harmonic distortion, THD - %
Output power, PO - W No. 4090-5/7
LA4450
No. 4090-6/7
LA4450
s 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. s Anyone purchasing any products described or contained herein for an above-mentioned use shall: 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: 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. s 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

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