SNVA757D August 2017 – September 2020 LP8860-Q1
The LP8860N-Q1 is configured for two strings × 150 mA using a 3.3-V VDD and I2C or SPI to control brightness. LED current can be adjusted using an ISET resistor. Table 2-21 lists detailed configuration and full EEPROM information for LP8860N-Q1.
J | ||
---|---|---|
Boost | Switching Current Limit | 9 A |
SYNC Input | Enabled | |
2 × Charge Pump | Enabled | |
Spread Spectrum | Enabled | |
ƒSW | 2.2 MHz | |
VDD | 3.3 V | |
Initial Boost Voltage | 34 V | |
LED Driver | Input Brightness Control Method | I2C/SPI BRT Register |
Max LED current per channel | 150 mA | |
ISET Resistor Control | Enabled | |
Number of Channels | 2 strings | |
Channel Phase Shift | 180 degrees (2 phases) | |
LED Output Dimming Method | PWM | |
Current to PWM Switch Point | N/A | |
Current Linearity Correction Slope | N/A | |
Output PWM Dimming Frequency | = 11 × F_VSYNC | |
Dimming Resolution | 10-bit PWM + 4-bit dither | |
Drive Strength and Rise Time | 100 ns | |
Dimming Ratio | 8192:1 | |
Sloper | 105 ms + advanced slope | |
Driver Headroom Voltage | VSAT + 50 mV | |
Fault Handling | Short LED Fault Threshold | 10.6 V |
VIN OVP Level | 22.5 V | |
VIN UVLO Level | 3 V | |
VDD UVLO | 2.5 V | |
Input OCP Limit | 8 A | |
Powerline FET Type | PMOS | |
SD Pulldown Current | 440 µA | |
Temperature Compensation | Internal Temperature Compensation | Disabled |
External Temperature Compensation | Disabled | |
Current Dimming Knee Point | N/A | |
EXT_TEMP_GAIN[3:0] | N/A | |
EXT_TEMP_LEVEL_HIGH[3:0] | N/A | |
EXT_TEMP_LEVEL_LOW[3:0] | N/A | |
VSYNC and PLL | PLL | Enabled = 8192 × 11 × F_VSYNC |
VSYNC input | Enabled | |
VSYNC or HSYNC | VSYNC | |
PWM_SYNC | 1 | |
Pre-divider | 0 | |
Slow PLL Divider | 10 | |
R_SEL | 0 | |
SEL_Divider | Slow | |
PWM_FREQ | 0 | |
PWM_RES | 3 |
ADDRESS (HEX) | VALUE (BIN) | VALUE (HEX) |
---|---|---|
60 | 11111111 | FF |
61 | 11111111 | FF |
62 | 11011100 | DC |
63 | 11110100 | F4 |
64 | 01011111 | 5F |
65 | 11111011 | FB |
66 | 11111010 | FA |
67 | 01110111 | 77 |
68 | 01110111 | 77 |
69 | 01110000 | 70 |
6A | 00111111 | 3F |
6B | 00000000 | 00 |
6C | 11001010 | CA |
6D | 11010000 | D0 |
6E | 10110000 | B0 |
6F | 10000111 | 87 |
70 | 11001111 | CF |
71 | 10100111 | A7 |
72 | 11100101 | E5 |
73 | 11100100 | E4 |
74 | 00110101 | 35 |
75 | 10101110 | AE |
76 | 01010010 | 52 |
77 | 11111111 | FF |
78 | 00111110 | 3E |
Figure 2-11 shows the use case for the LP8860N-Q1.