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| LP8860-Q1 Datasheet, PDF (39/112 Pages) Texas Instruments – Low-EMI, High-Performance 4-Channel LED Driver for Automotive Lighting | |||
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PWM
Temperature
LP8860-Q1
SNVSA21C â MAY 2014 â REVISED DECEMBER 2015
HIGH LEVEL
LOW LEVEL
TIME
Figure 31. LED Current Limitation With NTC
EXT_TEMP_LEVEL_LOW[3:0]
TEMPERATURE
EXT_TEMP_FLAG_L
FAULT PIN
READ STATUS REGISTER
(EXT_TEMP_FLAG_L and
EXT_TEMP_FLAG_H bits)
WRITE CLEAR FAULTS
Figure 32. Timing Diagram for LED Current Limitation With NTC
7.3.9.4 LED Current Dimming with External NTC Sensor
When an external resistor for maximum current control is used, current dimming for LED current can be used
also. In this case LED current can be de-rated when ambient temperature is high. This option must be enabled
by <EXT_TEMP_I_DIMMING_EN> and <EXT_TEMP_COMP_EN> EEPROM bits.
Knee point and slope are defined by <EXT_TEMP_MINUS[1:0]> and <EXT_TEMP_GAIN[3:0]> EEPROM bits
respectively. LED shutdown temperature is defined by <EXT_TEMP_LEVEL_HIGH[3:0]> bits. Serial and parallel
resistors R1 and R2 affect the slope and knee point and can be used for the thermal curve adjustment and NTC
linearization.
Copyright © 2014â2015, Texas Instruments Incorporated
Product Folder Links: LP8860-Q1
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