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LP5521 датащи(PDF) 38 Page - Texas Instruments

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номер детали LP5521
подробное описание детали  LP5521 Programmable Three-Channel LED Driver
PDF  48 Pages
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI1 - Texas Instruments

LP5521 датащи(HTML) 38 Page - Texas Instruments

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LP5521
MCU
COUT
1 PF
CIN
1 PF
SCL
SDA
CLK_32K
INT
ADDR_SEL0
ADDR_SEL1
TRIG
EN
VDD
GNDs
R
G
B
VOUT
CFLY1P
CFLY1N
CFLY2P
CFLY2N
RGB LED 0...25.5 mA/LED
GPO
Copyright © 2016, Texas Instruments Incorporated
38
LP5521
SNVS441H – JANUARY 2007 – REVISED MAY 2016
www.ti.com
Product Folder Links: LP5521
Submit Documentation Feedback
Copyright © 2007–2016, Texas Instruments Incorporated
8.2.1.3 Application Curves
Figure 27. Charge Pump Load Transient Response in 1.5×
Mode (0 to 25.5 mA)
Figure 28. Charge Pump Line Transient Response
1.5× Mode (VIN 3.5V to 4 V)
8.2.2 Application Without Charge Pump
In this application example the input voltage is high enough to drive the LEDs even without charge pump. In that
case the charge pump components are omitted, allowing savings on bill-of-material and also board space.
Charge pump must be set to 1× mode (bypass) in this case.
Figure 29. Typical Application Schematic Without Charge Pump
8.2.2.1 Design Requirements
DESIGN PARAMETER
EXAMPLE VALUE
Input voltage range
4.5 V to 5.5 V
LED VF (max)
3.6 V
LED current
25.5 mA maximum
Input capacitor
CIN = 1 μF
Output capacitor
COUT = 1 μF
Fly capacitors
none
Charge pump mode
1X



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