Ver.2
NJM2274
-
-
Q APPLICATION CIRCUIT
(1) Standard circuit (2) SAG correction unused circuit
(1) Standard circuit
The SAG correction reduces output coupling capacitor values.
The capacitor of C1 (33µF) is recommended for the portable application.
However, the 33µF capacitor may deteriorate SAG, and lose synchronization by luminance fluctuation.
Adjust the C1 value, checking the waveform containing a lot of low frequency components like a bounce
waveform (In case of worst condition). Change the capacitor of C1 into a large value to improve SAG.
(2) SAG correction unused circuit
Cancel the SAG correction to improve lost synchronization.
Connect the coupling capacitor after connecting the Vout pin and Vsag pin. The recommended value is 470µF or
more.
(Note)
The NJM2274 can’t drive two-line load of 150Ω.
75Ω
P.S
CTL
100µF 22µF
876
321
5
4
1000pF
Vout
NJM2274
PS
CTL
VoutGND VsagYIN
V
+
CIN Cmute
CTL
0.1µF
75Ω
Yin
75Ω
Cin
0.1µF
10µF
V
+
Cmute
CTL
+ +
C1
P.S
CTL
876
321
5
4
1000pF
NJM2274
PS
CTL
VoutGND VsagYIN
V
+
CIN Cmute
CTL
0.1µF
75Ω
Yin
75Ω
Cin
0.1µF
10µF
V
+
Cmute
CTL
75Ω
470µF
+
C1
Vout
