BA7078AF Ver la hoja de datos (PDF) - ROHM Semiconductor
Número de pieza
componentes Descripción
Fabricante
BA7078AF Datasheet PDF : 13 Pages
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Multimedia ICs
BA7078AF/AS
!Attached components
R:
The resistor for limiting the LED current.
Use the resistor of not less than 1W.
R
C1 : 47µF
Coupling capacitor for C / H SYNC IN
A low capacitance increases the size of the input pin waveform’s sag.
RPM-850
LED
C2 : 1µF
Coupling capacitor for VIDEO IN
A low capacitance increase the size of the input pin waveform’s sag.
C3 : 0.56µF
Conversion capacitor for f-V
A low capacitance increase the size of the ripple of the f-V conversion voltage. A large capacitance is not a
problem, but will delay the reaction speed.
C4 : 1.5 µF
Capacitor for POLH (detection of the vertical synchronization signal’s polarity)
The minimum capacitance is determined as follows:
The internal hysteresis comparator does not react when the duty of minimum frequency synchronization
(fV = 40Hz, T = 25ms) is 50%.
CMin. = 16µ × T [F]
A large capacitance is not a probrem, built will deray the reaction speed.
C5 : 1µF
Capacitor for EXIH (detection of the vertical synchronization signal’s existance)
The minimum capacitance is determined as follows:
The internal hysteresis comparator does not react at the minimum frequency synchronization (fV = 40Hz,
T = 25ms)
CMin. = 16µ × T [F]
A large capacitance is not a problem, but will deray the reaction speed.
C6 : 100pF Constant for setting the clamp pulse width
C7 : 0.47µF Coupling capacitor for VSYNC IN
A low capacitance increases the size of the input pin waveform’s sag.
R1 : 3.9kΩ A low resistance results in a narrow clamp pulse width. Set no lower than 1kΩ.
R2 : 1MΩ Discharge current setting resistor for CLAMP IN
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