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PDF LA4628 Data sheet ( Hoja de datos )
| Número de pieza | LA4628 | |
| Descripción | 20W 2-Channel BTL Power Amplifier | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LA4628 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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Ordering number : EN6632A
LA4628
Monolithic Linear IC
20W 2-Channel BTL Power Amplifier
for General Audio
http://onsemi.com
Overview
The LA4628 is a 2-channel general-purpose BTL audio power amplifier provided in a miniature package. It was
designed for the best possible audio quality and features an extended low band roll-off frequency provided by a
newly-developed NF circuit that does not require an external capacitor. Furthermore, crosstalk, which can cause
muddiness in the audio output, has been significantly reduced by both circuit and wiring pattern improvements. Thus
this amplifier can provide powerful lows and clear highs.
Note that this device is pin compatible with the 13.5W×2-channel LA4625, and allows end products differentiated by
their power rating to share the same printed circuit board.
Features
• Total output : 20W+20W (at VCC = 13.5V, RL = 4Ω, THD = 10%)
• High-fidelity design (fL < 10Hz, fH = 130kHz)
• Extremely low impulse noise levels
• An arbitrary amplifier startup time can be set up with external components.
• Full complement of built-in protection circuits (includes circuits that protect against shorting to VCC, shorting to
ground, load shorting, overvoltages and excessive temperatures)
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Maximum output current
Allowable power dissipation
Operating temperature
Symbol
VCC max
IO peak
Pd max
Topr
Storage temperature
Tstg
Conditions
No signal
Per channel
With an arbitrarily large heat sink
Ratings
24
4
32.5
-20 to +85
-40 to +150
Unit
V
A
W
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Semiconductor Components Industries, LLC, 2013
May, 2013
O0808 MS JK/92900RM(OT) No.6632-1/8
1 page  
LA4628
3. Impulse noise improvements
• While the LA4628 achieves a low level of impulse noise, if even further reductions in impulse noise at power on/off
(and when switching into or out of standby mode) a 0.47µF capacitor may be inserted between pin 7 and the PRE
GND pin (pin 3). (Pin 7 is the output amplifier bias pin. Since the ability to withstand shorting the output pins to
VCC or ground is reduced for supply voltages over 16V if the pin 7 capacitance is large, we recommend a value of
0.47µF or lower for this capacitor.)
4. Protection circuits
• Due to the system structure of the protection circuit for shorts to VCC or ground, if there is a DC resistance between
the amplifier output pins and ground, the protection circuit may operate when power is first applied and the
amplifier may fail to turn on. The basic design approach we recommend is not to adopt any designs in which there is
a DC resistance between the amplifier outputs and ground.
• The LA4628 includes a built-in thermal protection circuit to prevent the IC from being damaged or destroyed if
abnormally high temperatures occur. This thermal protection circuit gradually reduces the output if the IC junction
temperature (Tj) reaches the range 170 to 180°C due to inadequate heat sinking or other problem. If the temperature
falls, the amplifier will restart automatically.
• The LA4628 also includes other protection circuits. Use of these circuits also requires care during end product
design and testing.
5. Other notes
• The LA4628 is a BTL power amplifier. When testing this device, the ground systems for the test equipment
connected to IC inputs, and that for the test equipment connected to IC outputs, must be isolated. Do not use a
common ground.
Printed Circuit Pattern
(copper foil side)
GND
VCC
C5
+
14
GND
R2 C6
R3 C7
-OUT1
+OUT1
GND
R4 C8
R5 C9
-OUT2
+OUT2
1
LA4628
C1
+
+
C2
IN1
STB
R1
+
+
C4
C3
IN2
+
C10
No.6632-5/8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LA4628.PDF ] | |
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