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參數(shù)資料
| 型號： | LA49032H |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36 |
| 封裝： | 0.375 INCH, HSOP-36 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大小： | 809K |
| 代理商： | LA49032H |
LA49032H
No. A1038-8/12
Continued from preceding page.
C11
Switching regulator oscillation preventive capacitor, for which 1000pF is recommended.
C12
Power capacitor
CHP1, 2
HP output capacitor, for which 220μF is recommended.
CHP3
HP ripple filter capacitor, for which 47μF is recommended.
CHP4, 5
HP input capacitor, for which 1μF is recommended.
TR1
External switching transistor. The transistor of fT=30 to 50MHz is recommended appropriate to the current
*RB
capacity because the collector current of about 1.0A flows at peak. If the transistor of fT=100MHz or more
is to be used, add the base resistance of *RB 10Ω for adjustment to prevent oscillation because oscillation
may be induced in the switching waveform.
L1
Coil inductance range of 150 to 220μH is recommended.
D1
Flywheel diode to draw the coil energy. The Schottky barrier diode with small VF is recommended.
Operation of Functions
Fig. 1 Switching Regulator Internal Circuit
1. Switching regulator
LA49032H has the signal follow-up type self-excitation switching regulator to reduce power dissipation.
The pin 28 SW OUT (regulator output) has the voltage near about +2V of the output voltage, causing operation
following the output voltage.
The loss of output Tr is reduced to the minimum.
TR1 is the external switching Tr.
IC=1A and fT=30 to 50MHz are recommended.
When Tr of fT=100MHz or more is to be used, oscillation may be induced in the switching waveform,
To prevent such oscillation, add the base resistor (RB=10Ω).
L1, D1
For the inductance range of L1 coil, 150 to 220
μH is recommended. The peak current to flow the coil is about 1A.
The component with the current of 1A and small equivalent serial resistor (about 0.4
Ω or less) is recommended.
D1 is the flywheel diode to draw the coil energy. The Schottky barrier diode with small VF is recommended.
C10 is the switching regulator output smoothing capacitor. As this capacitor exerts influence on the self-excitation
stability and regulator efficiency, the capacitor with low equivalent serial resistance and superior temperature
characteristics is recommended. The recommended value is 2.2μF. From the same reason, use R1 2.2
Ω also.
Continued on next page.
SW OUT
SW E
SW B
30
L1
180
μH
D1
Flywheel
Di
TR1
Switching
Transistor
C10
2.2
μF/
25V
R5
2.2
Ω
470
Ω
150
Ω
Vreg = OUT + About 2V
Q2
Q3
29
28
35
OUT +/-
36
PRE VCC
Output Tr
VCC
35
Q1
ICC1
ICC2
Output Tr
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