NCL30083BDMR2G ON Semiconductor, NCL30083BDMR2G Datasheet - Page 23

• 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

Soft−Start
increasing slowly the LEDs light at startup. An internal
current source I
generated voltage ramp directly controls the amount of
current flowing in the LEDs.
an internal pre−charging current source I
V
The NCL30083 provides a soft−start pin allowing
At startup, if there are no faults (except “Enable_b” high),
V
V
V
CC(reset)
V
V
TF(start)
TF(stop)
OTP(off)
CC(on)
CC(off)
V
V
V
DRV
I
CC
SD
out
SST
7.4V clamp
SST
V
dd
I
charges the soft−start capacitor. The
SST
V
controller stops
switching
STOP
SD
I
SST(pre)
< V
OTP(off)
Figure 60. Thermal Fold−back / OTP Chronograms
:
SST(pre)
Figure 61. Soft−start Pin Bloc Diagram
4−s Timer
V
SST(EN)
−
+
connected
http://onsemi.com
V
SST
Enable_b
CS_reset
23
in parallel with I
reaches the V
off and the soft−start capacitor keep on charging with the
soft−start current source I
down to V
is removed.
When a fault is detected, the soft−start pin is discharged
STOP
4−s timer has elapsed
but V
≥ no restart
SST(EN)
S
R
SST(EN)
SD
Q
Q
SST
< V
to provide a clean soft−start when the fault
V
V
DRV pulses restart
TF(stop)
SD
CC
charges the soft−start capacitor until it
threshold. After that, I
Qdrv
> V
> V
SST
TF(stop)
CC(on)
.
Clamp
Circuit
VCC
:
and
Output
Buffer 1
SST(pre)
DRV
is turned