SNVS256D Novmeber 2003 – November 2016 LP3943
PRODUCTION DATA.
NOTE
Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.
The LP3943 is a 16-channel LED controller which has 16 low-side current switches. Each switch can control the LED current in its respective LED or LEDs by modulating its duty cycle and frequency.
For typical RGB LED light-driver applications, use the parameters listed in Table 14.
DESIGN PARAMETER | EXAMPLE VALUE |
---|---|
Minimum input voltage | 2.3 V |
Typical output voltage | 5 V |
Output current | 20 mA |
In many applications, the LEDs and the LP3943 share the same VDD, as shown in Figure 10. When the LEDs are off, the LED pins are at a lower potential than VDD, causing extra supply current (ΔIQ). To minimize this current, consider keeping the LED pins at a voltage equal to or greater than VDD.