Diodes AP2502 Manuel d'utilisateur télécharger pdf (Page 8)

Data Sheet

4-CH Linear Constant Current Sink With Matching AP2502

Oct. 2010 Rev 1. 1 BCD Semiconductor Manufacturing Limited

Typical Performance Characteristics (Continued)

Figure 12. LED Current (Note 2) Figure 13. Internal Oscillator Working at Low Frequency

=4V, V

=0 to 3.6V, Duty cycle=50%, f

PWM

=1kHz) (V

=4V, V

=0 to 3.6V, Duty cycle=50%, f

PWM

=0.1kHz)

Note 2: Chopper offset-canceling technology is adopted to get good current matching, I

LED

=[(I

)/2]*duty.

2V/div

LED

10mA/div

Time 400µs/div

Time 2ms/div

2V/div

LED

10mA/div

1 2 3 4 5 6 7 8 9 10 11 12

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Diodes AP2502 Manuel d'utilisateur Page 8