NCL30083BDMR2G ON Semiconductor, NCL30083BDMR2G Datasheet - Page 24

• Manufacturer Part Number: NCL30083BDMR2G
• Description: LED Lighting Drivers Step-Dimm Quasi-Res I-Mode Cntlr
• Manufacturer: ON Semiconductor

Specifications of NCL30083BDMR2G

• Rohs: yes
• Input Voltage: 18 V
• Operating Frequency: 65 kHz
• Maximum Supply Current: 1.2 mA
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: Micro-8
• Minimum Operating Temperature: - 40 C

Step Dimming
from 100% to 5% of its nominal value in discrete steps.
There are 5 steps in total. Table 4 shows the different steps
value and the corresponding output current set−point. Each
time a brown−out is detected, the output current is decreased
by decreasing the reference voltage V
current value.
event occurs, the controller restarts at 100% of the output
current.
Table 4. DIMMING STEPS
The step dimming function decreases the output current
When the 5% dimming step is reached, if a brown−out
Dimming Step
V
V
V
CC(reset)
V
V
bulk(on)
bulk(off)
CC(on)
CC(off)
ON
V
BO
comp
1
2
3
4
5
V
bulk
I
CC
out
100%
100%
70%
40%
25%
10%
I
5%
out
70%
REF
Perceived Light
setting the output
Figure 63. Step Dimming Chronograms
100%
84%
63%
50%
32%
17%
http://onsemi.com
40%
24
Note:
high enough when the light is turned−off to let the controller
memorize the dimming step state.
for step dimming with a capacitor allowing providing
enough V
until V
The power supply designer must ensure that V
The power supply designer should use a split V
The step dimming state is memorized by the controller
CC
25%
CC
VCC
crosses V
for 1 s (47 mF to 100 mF capacitor).
Figure 62. Split VCC Supply
CC(reset)
4.7 mF
10%
.
47 − 100 mF
5%
CC
CC
circuit
stays