SANYO LA4450 Datasheet
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
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 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.
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
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
Package Dimensions
unit: mm
3023A-SIP14H
Specifications
Maximum Ratings at Ta = 25°C
Note: * Set VCCand RLwithin ranges that do not cause Pd max to exceed 25 W.
(When V
CC
is 37 V, RLshould be 6 Ω or larger and when VCCis 35 V, RLshould be 4 Ω or larger.)
Operating Conditions at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
CC
max Rg = 0 (no signal) 37 V
Maximum output current I
O
peak 4A
Allowable power dissipation Pd max* Infinite heat sink 25 W
Operating temperature Topr –35 to +80 °C
Storage temperature Tstg –40 to +150 °C
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
CC
26.4 V
Recommended load resistance R
L
8 Ω
Operating supply voltage range V
CC
op 10 to 30 V
Monolithic Linear IC
Ordering number : EN4090C
LA4450
Two Channel Power IC for Bus or Track
Use in TV and Home Audio Applications
43098HA (OT)/10794TS B8-0618/1102 No. 4090-1/7
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
SANYO: SIP-14H
[LA4450]
Operating Characteristics at Ta = 25°C, VCC= 26.4 V, RL= 8 Ω, f = 1 kHz, Rg = 600 Ω
No. 4090-2/7
LA4450
Parameter Symbol Conditions
Ratings
Unit
min typ max
Standby current Ist Standby switch off 1 30 µA
Quiescent current I
CCO
Rg = 0 50 80 140 mA
Output power
P
O1
THD = 10% 10 12 W
P
O2
THD = 10%, RL= 4 Ω 20 W
Voltage gain VG V
O
= 0 dBm 49 51 53 dB
Total harmonic distortion THD P
O
= 1 W 0.07 0.4 %
Output noise voltage V
NO
Rg = 0, BPF-BW = 20 Hz to 20 kHz 0.4 1.0 mV
Ripple exclusion ratio SVRR Rg = 0, f
R
= 100 Hz, VR= 0 dBm 45 55 dB
Channel separation CHsep V
O
= 0 dBm, Rg = 10 kΩ 45 55 dB
Standby control voltage Vst With a 10 kΩ resistor connected at pin 12 2.5 V
CC
V
Pd max – Ta
Allowable power dissipation, Pdmax – W
Ambient temperature, Ta – °C
θf– S
f
Heat sink thermal resistance, θ
f
– °C/W
Heat sink surface area, Sf– cm
2
Test Circuit
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
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.
30 kΩ
75 + R
Nf’
No. 4090-3/7
LA4450
Unit (resistance : Ω, capacitance : F)
Loading...