© 2016 Fairchild Semiconductor Corporation
13
FEBFL77944_L80L012A_B
• Rev. 1.0
6.5.
Dimming Operation & Performance
Table 8.
Dimming Operation Waveform According to Variable Dimming Voltage
DIM: 1 V
DIM: 5 V
DIM: 9 V
50 Hz
at 120 V
AC
60 Hz
at 120 V
AC
Figure 5.
Ch2: V
IN.ac
, 100 V/div, Ch4: I
IN.ac
50.0 mA/div,Dimmer: SF 10p-W by Cooper Wiring Devices
Figure 6.
[Low-Line w/o SVF] Dimming Performance: Output Current vs. Analog Dimming
The FL77944 analog dimming function can be implemented with a few external components.
The converter output current at the rated line voltage can be adjusted within the range of 8.4% to 100% of
the nominal current value through 0 to 10 V A-DIM signal.
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
0
1
2
3
4
5
6
7
8
9
9.7
108Vac, 50Hz
120Vac, 50Hz
132Vac, 50Hz
108Vac, 60Hz
120Vac, 60Hz
132Vac, 60Hz
O
u
tp
u
t
Cu
rr
e
n
t
[mA
]
A-DIM [V]
