LA4919N Datasheet, PDF (6/6 Pages) Sanyo Semicon Device – Monolithic Linear IC Two-Channel 10W BTL High-Efficiency TV Audio Output Power Amplifier

LA4919N
Tr1 :
D1 :
L1 :
〈Headphone Block〉
C1 and C2 :
C3 :
C16 and C17 :
C18 and C19 :
External switching transistor. We recommend using a device with IC = 2.5A and fT = 30 to
50MHz. Note that if a transistor with fT = 100MHz or higher is used, it may induce oscillation in
the switching waveform. In this case, we recommend adding a base resistor of about 10Ω, and
adjusting the circuit so that oscillation does not occur.
Flywheel diode to take up the energy from the coil. We recommend using a Schottky barrier diode
with a low VF.
We recommend using a 200µH coil. In particular, we recommend a coil in the inductance range
180 to 220µH, a DC resistance of under 0.3Ω, and a maximum allowable current of over 0.4A.
Input capacitors. We recommend a value of 0.1µF.
Ripple filter capacitor. We recommend a value of 47µF.
Oscillation prevention capacitors. We recommend using polyester film capacitors with excellent
thermal characteristics. These are used together with R6 and R7.
Output capacitors. We recommend a value of 100µF.
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This catalog provides information as of November, 2006. Specifications and information herein are subject
to change without notice.
PS No.A0323-6/6