NCL30083BDMR2G ON Semiconductor, NCL30083BDMR2G Datasheet - Page 25

• 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

V
the controller must be able to safely limit the output voltage
excursion.
Valley Lockout
switching frequency excursion. The switching frequency
increases when the output load decreases or when the input
voltage increases. The switching frequency of such systems
must be limited.
increases and as the output current set−point is varied
(thermal fold−back and step dimming). This limits the
switching frequency excursion. Once a valley is selected,
the controller stays locked in the valley until the input
CC
If no output load is connected to the LED power supply,
Quasi−Square wave resonant systems have a wide
The NCL30083 changes valley as the input voltage
800m
600m
400m
200m
Over Voltage Protection (Open LED Protection)
40.0
30.0
20.0
10.0
40.0
30.0
20.0
10.0
8.00
6.00
4.00
2.00
0
0
0
0
1.38
V CC(OVP)
V CC(on)
V CC(off)
Figure 64. Open LED Protection Chronograms
3.96
http://onsemi.com
time in seconds
6.54
25
V
the 4−s timer starts counting. The IC re−start pulsing after
the 4−s timer has elapsed and when V
voltage or the output current set−point varies significantly.
This avoids valley jumping and the inherent noise caused by
this phenomenon.
logic selects the operating valley according to VIN pin
voltage (line range detector in Figure 65), SD pin voltage
and dimming state imposed by the Step Dimming circuit.
controller operates in the first valley at low line and in the
second valley at high line.
CC(OVP)
In the NCL30083, when the V
The input voltage is sensed by the VIN pin. The internal
By default, when the output current is not dimmed, the
threshold, the controller stops the DRV pulses and
9.11
CC
11.7
CC
voltage reaches the
≥ V
CC(on)
1
2
3
4
.
V out
I out
V CC
OVP