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LP8551TLX/NOPB bảng dữ liệu(PDF) 19 Page - Texas Instruments

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LP8551TLX/NOPB bảng dữ liệu(HTML) 19 Page - Texas Instruments

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LP8551
www.ti.com
SNVS673E – APRIL 2010 – REVISED SEPTEMBER 2014
8.3.4.4 Device Thermal Regulation
The LP8551 has an internal temperature sensor which can be used to measure the junction temperature of the
device and protect the device from overheating. During thermal regulation, LED PWM is reduced by 2% of full
scale per °C whenever the temperature threshold is reached. Temperature regulation is enabled automatically
when chip is enabled. 11-bit temperature value can be read from Temp MSB and Temp LSB registers, MSB
should be read first. Temperature limit can be programmed in EEPROM as shown in the following table.
Thermal regulation function does not generate fault signal.
TEMP_LIM[1:0]
OVER-TEMP LIMIT (°C)
00
OFF
01
110
10
120
11
130
8.3.4.5 Thermal Shutdown
If the LP8551 reaches thermal shutdown temperature (150°C), the LED outputs and boost shut down to protect it
from damage. Also the FAULT pin is pulled down to indicate the fault state. The device activates again when
temperature drops below 130°C degrees.
Fault is cleared by setting EN pin low or by reading the fault register.
Copyright © 2010–2014, Texas Instruments Incorporated
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Product Folder Links: LP8551



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