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DLPA2000 Folha de dados(PDF) 21 Page - Texas Instruments

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Nome de Peças DLPA2000
Descrição Electrónicos  Power Management and LED/Lamp Driver IC
PDF  58 Pages
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

DLPA2000 Folha de dados(HTML) 21 Page - Texas Instruments

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CORE
INC
CORE
CORE
OUT
V
1
V
1
V
V
ESR
L
f
8
C
f

§
·
'
u
u

¨
¸
u
u
u
©
¹
SW4LIM_EN
1
0
VLED
BUCK-BOOST
VDAC
ILIM [3:0]
200
IDAC
SW4_IDAQ [9:0]
1
0
1
0
RLIM
STROBE
DECODER
LED_SEL [1:0]
MAP
FB
VLED
SW4
SW5
SW6
RLIM
RLIM_K
E/ A
E/ A
E/ A
I-LED
I-LED
I-LED
I-DAC
RBOT_K
SW5_IDAQ [9:0]
SW6_IDAQ [9:0]
SW5LIM_EN
SW6LIM_EN
DLPA2000
www.ti.com
DLPS043A – JUNE 2014 – REVISED AUGUST 2015
Figure 9. 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.
Copyright © 2014–2015, Texas Instruments Incorporated
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