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TS4621EIJT датащи(PDF) 6 Page - STMicroelectronics

номер детали TS4621EIJT
подробное описание детали  High-performance class-G stereo headphone amplifier with I2C volume control
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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Typical application schematics
TS4621E
6/32
Doc ID 022201 Rev 1
Table 4.
TS4621E component description
Component
Value
Description
Cs
2.2 µF
Decoupling capacitors for VCC. A 2.2 µF capacitor is sufficient for proper
decoupling of the TS4621E. An X5R dielectric and 10 V rating voltage is
recommended to minimize
ΔC/ΔV when VCC =4.8 V.
Must be placed as close as possible to the TS4621E to minimize parasitic
inductance and resistance.
C12
2.2 µF
Capacitor for internal negative power supply operation. An X5R dielectric and
6.3 V rating voltage is recommended to minimize
ΔC/ΔV when
HPVDD = 1.9 V.
Must be placed as close as possible to the TS4621E to minimize parasitic
inductance and resistance.
CSS
2.2 µF
Filtering capacitor for internal negative power supply. An X5R dielectric and
6.3 V rating voltage is recommended to minimize
ΔC/ΔV when
HPVDD = 1.9 V.
Cin
Input coupling capacitor that forms with Zin/2 a first-order high-pass filter with
a -3 dB cutoff frequency FC. For example, at maximum gain G = 4 dB,
Zin = 12.5 k
Ω, Cin = 2.2 µF, therefore FC = 6 Hz.
Cout
0.8 to 100 nF
Output capacitor of 0.8 nF minimum to 100 nF maximum. This capacitor is
mandatory for operation of the TS4621E.
Rout
12
Ω min.
Output resistor in-series with the TS4621E output. This 12
Ω minimum resistor
is mandatory for operation of the TS4621E.
L1
3.3 µH
Inductor for the buck convertor.
References of inductors:
FDK: MIPSZ2012D3R3 (DC resistance = 0.19
Ω, rated current = 0.8 A)
Murata: LQM2MPN3R3G0 (DC resistance = 0.12
Ω, rated current = 1.2 A)
Ct
10 µF
Tank capacitor for internal buck convertor. An X5R dielectric and 6.3 V rating
voltage is recommended to minimize
ΔC/ΔV when HPVDD = 1.9 V.
ESR of the Ct capacitor must be as low as possible to obtain the best buck
efficiency.
Cin
1
2
πZinFc
------------------------
=


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