NCL30081ASNT1G ON Semiconductor, NCL30081ASNT1G Datasheet - Page 18

• Manufacturer Part Number: NCL30081ASNT1G
• Description: LED Lighting Drivers Step-Dimm Quasi-Res I-Mode Cntlr
• Manufacturer: ON Semiconductor

Specifications of NCL30081ASNT1G

• Rohs: yes
• Input Voltage: 18 V
• Operating Frequency: 65 kHz
• Maximum Supply Current: 1 mA
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: TSOP-6
• Minimum Operating Temperature: - 40 C

Internal Soft−Start
internal soft−start of 40 ms.
volts, the demagnetization time is long and the constant
Cycle−by−Cycle Current Limit
threshold V
switching cycle (Figure 45).
At startup or after recovering from a fault, there is a small
In addition, during startup, as the output voltage is zero
When the current sense voltage exceeds the internal
800m
600m
400m
200m
800m
600m
400m
200m
16.0
12.0
8.00
4.00
0
0
0
ILIM
, the MOSFET is turned off for the rest of the
604u
Figure 44. Startup Simulation Showing the Natural Soft−start
1.47m
http://onsemi.com
time in seconds
2.34m
18
current control block will slowly increase the peak current
towards its nominal value as the output voltage grows.
Figure 44 shows a soft−start simulation example for a 9 W
LED power supply.
Winding and Output Diode Short−Circuit Protection
another comparator with a reduced LEB (t
threshold (1.5 V typical) is able to sense winding
short−circuit and immediately stops the DRV pulses. The
controller goes into auto−recovery mode in version B.
DRV pulses stop and VCC ramps up and down. The circuit
un−latches when VCC pin voltage drops below V
threshold.
In parallel with the cycle−by−cycle sensing of the CS pin,
In version A, the controller is latched. In latch mode, the
3.21m
4.07m
BCS
) and a higher
1
2
4
3
V Control
V CS
V out
I out
CC(reset)