la4625 Sanyo Semiconductor Corporation, la4625 Datasheet - Page 5

• Manufacturer Part Number: la4625
• Description: Two-channel 13.5 W Btl Audio Power Amplifier
• Manufacturer: Sanyo Semiconductor Corporation

3. Impulse noise improvements
4. Protection circuits
5. Other notes
Printed Circuit Pattern
• While the LA4625 achieves a low level of impulse noise, if even further reductions in impulse noise at power on/off
• Due to the system structure of the protection circuit for shorts to V
• The LA4625 includes a built-in thermal protection circuit to prevent the IC from being damaged or destroyed if
• The LA4625 also includes other protection circuits. Use of these circuits also requires care during end product
• The LA4625 is a BTL power amplifier. When testing this device, the ground systems for the test equipment
(and when switching into or out of standby mode) a 0.47 µF 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
V
0.47 µF or lower for this capacitor.)
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.
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.
design and testing.
connected to IC inputs, and that for the test equipment connected to IC outputs, must be isolated. Do not use a
common ground.
CC
(copper foil side)
or ground is reduced for supply voltages over 16 V if the pin 7 capacitance is large, we recommend a value of
GND
GND
GND
V CC
R2
R3
R4
R5
+
C5
C6
C7
C8
C9
--OUT1
+OUT1
--OUT2
+OUT2
LA4625
14
CC
or ground, if there is a DC resistance between
+
+
+
1
R1
LA4625
C4
C2
C1
+
+
C10
C3
IN1
STB
IN2
ILA00349
No. 6631-5/8