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LP8866S-Q1 Datasheet(PDF) 24 Page - Texas Instruments |
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LP8866S-Q1 Datasheet(HTML) 24 Page - Texas Instruments |
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24 / 82 page  7.3.7 LED Current Sinks 7.3.7.1 LED Output Current Setting The maximum output LED current is set by an external resistor value. For the application only using external resistor RISET to set the maximum LED current for each string, the Equation 14 is used to calculate the current setting of all strings: LED ISET 1.21V I = 2580 R u (14) The LEDx_CURRENT[11:0] registers can also be used to adjust strings current down from this maximum. The default value for LEDx_CURRENT[11:0] registers is the maximum 0xFFF(4095). Equation 15 is used to calculate the current setting of an individual string: LED ISET 1.21V LED_CURRENT[11:0] I = 2580 R 4095 § · § · u u ¨ ¸ ¨ ¸ © ¹ © ¹ (15) For high accuracy of LED current, the ILED current is recommended to set in range from 30 mA to 200 mA. So the RISET value is in the range from 15.6 kΩ to 104 kΩ. RISET ISET EXTERNAL CURRENT SENSING LED_CURRENT[11:0] EA VDD OUT2 Current Sink OUT1 Current Sink OUT3 Current Sink OUT4 Current Sink OUT5 Current Sink OUT6 Current Sink R OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 VREF Current Gain Figure 7-8. LED Driver Current Setting Circuit 7.3.7.2 LED Output String Configuration The Six LED driver channels of the LP8866S-Q1 device is configured by the LED_SET resistor, which supports applications using one to Six LED strings. Resistor with 1% accuracy is needed to ensure proper operation. The driver channels can also be tied together in groups of one, two or three. This allows the LP8866S-Q1 device to drive three 300-mA LED strings, two 450-mA LED strings, or one 900-mA LED string. The LED strings are always appropriately phase shifted for their string configuration. This reduces the ripple seen at the boost output, which allows smaller output capacitors and reduces audible ringing in the capacitors. Phase shift increases the LP8866S-Q1 SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021 www.ti.com 24 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: LP8866S-Q1 |
Similar Part No. - LP8866S-Q1_V01 |
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Similar Description - LP8866S-Q1_V01 |
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