MV1012SC

3

5. Dimming characteristics............................................................................................................................................... 19

5.1 Operation in each mode......................................................................................................................................... 20

5.1.1

[A] Frequency modulation region................................................................................................................... 20

5.1.2

[B] Off-time modulation region..................................................................................................................21-22

5.1.3

[C] Oscillation off region ................................................................................................................................ 23

5.2 PWM dimming........................................................................................................................................................ 24

5.2.1

PWM dimming in 100% and Oscillation off regions ....................................................................................... 24

5.2.2

Combination of linear dimming and PWM dimming....................................................................................... 25

5.3 Dimming circuit ...................................................................................................................................................... 26

5.3.1

Example of dimming circuit smoothing PWM signal ...................................................................................... 26

6. Operations in abnormal situations ............................................................................................................................... 27

6.1 LED open-circuit .................................................................................................................................................... 27

6.2 LED short-circuit .................................................................................................................................................... 27

6.3 Abnormal heat buildup ........................................................................................................................................... 28

6.4 CS pin open-circuit................................................................................................................................................. 28

6.5 CS-GND short-circuit ............................................................................................................................................. 28

6.6 Current detection resistor open-circuit ................................................................................................................... 28

6.7 Current detection resistor short-circuit ................................................................................................................... 28

7. Standard circuit example ............................................................................................................................................. 29

7.1 Power supply specification and circuit diagram...................................................................................................... 29

7.2 Power supply characteristics.................................................................................................................................. 30

7.3 Example of operation waveform........................................................................................................................30-31

CAT.No.1A0602-1E