LPD6803 데이터 시트보기 (PDF) - Unspecified

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LPD6803

3 channel constant-current driver and grey-level modulate output

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LPD6803 datasheet

This mode (OMODE=high voltage level or dangle)is suitable used in the situation which

VDD not higher 12V and current on each way not huge 400mA, if VDD<7.5V, you can

ignore those parts in blue dashed above chart, directly contact VDD to VCC.

Current regulator resistance count: RL=(VDD-VLED-VOUT)/ILED

Here: RL is limit current resistance value, VDD is LED light supply voltage, VLED is LED

light voltage when it breakover, VOUT is saturation voltage of the output polar to the

grand(about 0.4v –0.8v), ILED is LED working current( normally no bigger 20mA)

LPD6803 has strong driver capability , in the many LED apply situation, we can adopt

the contact of “First serial then parallel” ( see right chart), but we must pay attention on

power consumption can not exceed maxim value PDMAX:

PD=ILED1*VOUT1+ILED2*VOUT@+ILED3*VOUT3+PIC

Here : PIC is IC basic power consumption , normally not exceed 25mW.

>Inside constant current driver mode:

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