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參數資料
| 型號： | LA4905 |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 25 W, 2 CHANNEL, AUDIO AMPLIFIER, ZFM23 |
| 封裝： | SIP-23 |
| 文件頁數： | 6/10頁 |
| 文件大小： | 756K |
| 代理商： | LA4905 |
Sample Printed Circuit Board Pattern
1. External Component Functions
C1, C2
Input capacitors; recommended value: 2.2 μF. Note that the low-frequency band can be adjusted by changing
the values of C1 and C2, since fL depends on their value, although the value must not exceed 3.3 μF (when
C4 is 22 μF) due to pop noise considerations.
C3
Beep amplifier input capacitor. Use the same value as that used for C1 and C2. Connect the beep amplifier to
PRE-GND through C3 if the beep function is not used.
C4
Amplifier power-on delay time setting capacitor; recommended value: 22 μF. At the recommended value, the
amplifier will turn on in about 0.7 second after power is applied. The delay time is proportional to the
capacitance and can be set to an arbitrary value. However, a value of 22 μF or larger should be used due to
pop noise considerations.
C5, C6,
Oscillation prevention capacitors. Use capacitors with excellent temperature characteristics such as polyester
film or Mylar capacitors. These capacitors function in conjunction with R1, R2, R3, and R4. We recommend
using capacitors of 0.1 μF or larger, since the stability varies somewhat depending on the printed circuit
board layout.
C9
Decoupling capacitor (ripple filter)
C10
Power-supply capacitor
C11
Switching regulator oscillation prevention capacitor; recommended value: 1500 pF.
C12
Switching regulator output smoothing capacitor. The LA4905 adopts a self-excitation switching regulator
scheme. Since this capacitor influences the stability of the self-excitation and the regulator efficiency, there is
an optimal value. We recommend the use of a 2.2-μF, 25-V OS capacitor with good temperature
characteristics. Note that a 2.2-
Ω, 1/2-W resistor should be used for R5 for the same reason.
R5
Standby switch current limiting resistor; recommended value: 10 k
Ω.
(When the voltage applied to the standby switch is between 3 and 13.2 V.) Note that this resistor cannot be
removed. See the section "Standby Function" elsewhere in this document.
TR1
External switching transistor. We recommend using a 2SD1668 of rank S. A 2SD1667 of rank S may be used if
the application is designed to handle 4-
Ω loads (RL). A heat sink must be provided along with that for the IC.
D1
Flywheel diode that takes up the coil energy. We recommend using an SB40-05J, which is a Schottky barrier
diode with a low VF.
An SB10-05A2 may be used if the application is designed to handle 4-
Ω loads (RL). A joint heat sink is not
required.
L1
We recommend the use of the HP-022Z 180-μH coil manufactured by Tokin, Ltd. The 200-μH HP-011Z may
be used if the application is designed to handle 4-
Ω loads (RL).
No. 5504-5/10
LA4905
C7, C8
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