NCL30083(2013_02) 데이터 시트보기 (PDF) - ON Semiconductor

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NCL30083
(Rev.:2013_02)

Dimmable Quasi-Resonant Primary Side Current-Mode Controller for LED Lighting with Thermal Fold-back

ON Semiconductor 

Bulk rail

NCL30083

VDD

VIN

ICS(offset)

CS

RLFF

Q_drv

Rsense

Offset_OK

Figure 67. Line Feed−Forward Schematic

Brown−out

In order to protect the supply against a very low input

voltage, the NCL30083 features a brown−out circuit with a

fixed ON/OFF threshold. The controller is allowed to start

if a voltage higher than 1 V is applied to the VIN pin and

Vbulk

shuts−down if the VIN pin voltage decreases and stays

below 0.9 V for 50 ms nominal. Exiting a brown−out

condition overrides the hiccup on VCC (VCC does not wait

to reach VCC(off)) and the IC immediately goes into startup

mode (ICC = ICC(start)).

VIN

+

−

1 V if BONOK high

0.9 V if BONOK low

50−ms blanking time

Figure 68. Brown−out Circuit

BO_NOK

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