DLPC3435 datasheet(21/58 Pages) TI2

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CORE

INC

CORE

OUT

ESR

u ¨

SW4LIM_EN

VLED

BUCK-BOOST

VDAC

ILIM [3:0]

200

IDAC

SW4_IDAQ [9:0]

RLIM

STROBE

DECODER

LED_SEL [1:0]

MAP

VLED

SW4

SW5

SW6

RLIM

RLIM_K

E/ A

I-LED

I-DAC

RBOT_K

SW5_IDAQ [9:0]

SW6_IDAQ [9:0]

SW5LIM_EN

SW6LIM_EN

DLPA2000

www.ti.com

DLPS043B – JUNE 2014 – REVISED FEBRUARY 2018

Product Folder Links: DLPA2000

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Figure 10. LED Driver Block Diagram

7.3.7 1.1-V Regulator (Buck Converter)

The buck converter creates a voltage of 1.1 V, and due to its switching nature, an output ripple with a frequency

of approximately 2.25 MHz occurs on its output. This ripple is strongly dependent on the decoupling capacitor at

the output in combination with the inductor. The magnitude of the ripple can be calculated with Equation 6.

(6)

The best way to minimize this ripple is to select a capacitor with a very-low ESR.

DLPC3435 数据表(PDF) 21 Page - Texas Instruments

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