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LP8543 bảng dữ liệu(PDF) 25 Page - Texas Instruments

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tên linh kiện LP8543
Giải thích chi tiết về linh kiện  High-Voltage DC/DC Boost Converter With Integrated FET
PDF  40 Pages
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nhà sản xuất  TI [Texas Instruments]
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LP8543 bảng dữ liệu(HTML) 25 Page - Texas Instruments

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Low threshold
Mid threshold (Low + 0.5V)
High threshold
All voltages are above Mid threshold =>
boost voltage needs to be adjusted down!
Low threshold
Mid threshold (Low + 0.5V)
High threshold
This causes the boost
voltage to rise!
Low threshold
Mid threshold (Low + 0.5V)
High threshold
LP8543
www.ti.com
SNVS604D – AUGUST 2009 – REVISED MARCH 2013
Figure 18. Normal Operation, High PWM Value
If one LED driver voltage is below Low, boost voltage will be increased. This is seen in the following figure.
Figure 19. Boost voltage too Low
If all driver voltages are above Mid threshold (or any of the voltages in PSPWM adaptation mode and with low
PWM value), boost voltage will be lowered. Decision is always based on number of strings active at the same
time. In the illustrations 6 outputs are active, which basically means close to 100% PWM value with PSPWM.
Figure 20. Boost voltage too High
Fault Detection
LP8543 has fault detection for LED fault, low-battery voltage, overcurrent and thermal shutdown. The open drain
output pin (FAULT) can be used to indicate occurred fault. The cause for the fault can be read from status
register. Refreshing the <BL_CTL> bit high will reset the fault register and fault pin state.
Copyright © 2009–2013, Texas Instruments Incorporated
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