LP8550TLXSLASHNOPB datasheet(35/49 Pages) TI2

部件名	LP8550TLX/NOPB

功能描述	LP8550 High-Efficiency LED Backlight Driver for Notebooks

PDF	49 Pages

Scroll/Zoom	100%

制造商	TI2 [Texas Instruments]

网页	https://www.ti.com

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35 / 49 page

LP8550

www.ti.com

SNVS657E – SEPTEMBER 2010 – REVISED SEPTEMBER 2014

EEPROM ADDRESS 7 REGISTER

HYSTERESIS

1:0

R/W

PWM input hysteresis function. Defines how small changes in the PWM input are ignored to

remove constant switching between two values.

00 = OFF

01 = 1-bit hysteresis with 11-bit resolution

10 = 1-bit hysteresis with 10-bit resolution

11 = 1-bit hysteresis with 8-bit resolution

Table 7. PLL Value Calculation

en_vsync

PLL FREQUENCY [MHz]

PLL[12:0]

5, 10, 20, 40

not used

5 MHz / (26 x fVSYNC)

10 MHz / (50 x fVSYNC)

20 MHz / (98 x fVSYNC)

40 MHz / (196 x fVSYNC)

PLL frequency is set by PWM_RESOLUTION[1:0] bits.

For Example:

If fPLL = 5 MHz and fVSYNC = 60 Hz, then PLL[12:0] = 5000000 Hz / (26 * 60 Hz) = 3205d = C85h.

If fPLL = 10 MHz and fVSYNC = 75 Hz, then PLL[12:0] = 10000000 Hz / (50 * 75 Hz) = 2667d = A6Bh.

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LP8550TLX/NOPB 数据表(PDF) 35 Page - Texas Instruments