LA4919N Datasheet, PDF (5/6 Pages) Sanyo Semicon Device – Monolithic Linear IC Two-Channel 10W BTL High-Efficiency TV Audio Output Power Amplifier

Test Circuit
C1
1µF/1+0V
1 HP IN1
+
C2
1µF/10V
C3
47µF/25V
2
+3
HP IN2
HP D.C
4 HP Standby
5 AMP Standby
C4
47µF/25V
+6
D.C
7
*When measuring 10kΩ
DDL OUT, apply 5V _{*DDL OUT}
aan1d0km_Ωearessuirsetothr.rough22_{µCF/56.3V + 8}
DDL
ON TIME
+
C6
2.2µF/6.3V
9 ^IN2
10 ^{PRE GND}
+B
+
C20
10µF/25V
C7
22µF/6.3V
11 ^{PRE VCC}
+ ^{12 IN VREF}
+
C8
2.2µF/6.3V
13 IN1
14 POWER GND
* : When used shorted to VCC (pin 19),
it is not necessary to add a capacitor
at pin 11.
LA4919N
HP OUT1
HP OUT2
POWER GND
OUT2-
R7 10Ω
C17
28 ^0.047µF
0.1µF
27 _C16
0.047µF
R6 10Ω
26
25
+C18 ^100µF/10V
Headphones
+
C19 100µF/10V
R4 2.2Ω
*C15 0.1µF
OUT2+ 24
SW GND 23
SWB 22
SWE 21
SW OUT ₂₀
VCC ₁₉
18
17
OUT1+ 16
*C14 0.1µF
R3 2.2Ω
Tr1
Switching transistor
IC=2.5V
fT=30 to 50MHz
D1 Flywhool Di
L1 200µH
+
C13 R5
2.2µF/25V 2.2kΩ
C12
1000µF/25V
Components used during testing
- Tr1 : 2SD1667 (S rank)
- SANYO Electric Co., Ltd.
- D1 : SB10-05A2
- SANYO Electric Co., Ltd.
- L1 : A671HN-221L
- TOKO, Inc.
-C13 : OS capacitor
- SANYO Electric Co., Ltd.
+B
+
C11 1000pF
R1 2.2Ω
*C9 0.1µF
OUT1- 15
*C10 0.1µF
R2 2.2Ω
* : Polyester film capacitor
External Components
〈Amplifier Block〉
C4 :
Ripple filter capacitor. We recommend a value of 47µF.
C5 :
Sets the amplifier turn-on delay time. We recommend a value of 22µF. (The turn-on delay time for
this value will be about 0.7 seconds.) While the speed with which the amplifier turns on can be
increased by reducing the value of this capacitor, this can result in impulse noise. We recommend
using a value of over 10µF.
C6 and C8 :
Input capacitors. We recommend a value of 22µF. Note that if modified, 3.3µF or lower values
should be used due to the relationship with impulse noise.
C7 :
Input reference amplifier capacitor. The same value as that for C6 and C8 must be used.
C9 and C10 :
Oscillation prevention capacitors. We recommend using polyester film capacitors with excellent
thermal characteristics. These are used together with R1, R2, R3, and R4.
C14 and C15
C11 :
Switching regulator oscillation prevention capacitor. We recommend a value of 1000pF.
C12 :
Power supply capacitor
C13 :
Switching regulator output smoothing capacitor. The LA4919N adopts a self-excited switching
regulator technique. Since this capacitor influences the self excitation stability characteristics and
the regulator efficiency, we recommend using a capacitor with a low equivalent series resistance
and excellent thermal characteristics. For the same reason, resistor R5 (2.2Ω) is used together with
this capacitor.
C20 :
Pre-VCC power supply capacitor. This capacitor is not required when used connected to VCC.
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