SNVA757D August 2017 – September 2020 LP8860-Q1
The LP8860J-Q1 is configured for three strings × 80 mA using a 3.3-V VDD and I2C or SPI to control brightness. LED current can be adjusted using an ISET resistor. Table 2-17 lists detailed configurations and full EEPROM information for LP8860J-Q1.
J | ||
---|---|---|
Boost | Switching Current Limit | 6 A |
SYNC Input | Disabled | |
2 × Charge Pump | Enabled | |
Spread Spectrum | Enabled | |
ƒSW | 2.2 MHz | |
VDD | 3.3 V | |
Initial Boost Voltage | 28 V | |
LED Driver | Input Brightness Control Method | I2C/SPI BRT Register |
Max LED current per channel | 80 mA | |
ISET Resistor Control | Enabled | |
Number of Channels | 3 strings | |
Channel Phase Shift | 120 degrees (3 phases) | |
LED Output Dimming Method | PWM | |
Current to PWM Switch Point | N/A | |
Current Linearity Correction Slope | N/A | |
Output PWM Dimming Frequency | 9.766 kHz | |
Dimming Resolution | 10-bit PWM + 4-bit dither | |
Drive Strength and Rise Time | 200 ns | |
Dimming Ratio | 1024:1 | |
Sloper | 105 ms + advanced slope | |
Driver Headroom Voltage | VSAT + 50 mV | |
Fault Handling | Short LED Fault Threshold | 6.9 V |
VIN OVP Level | 22.5 | |
VIN UVLO Level | 5 V | |
VDD UVLO | 3 V | |
Input OCP Limit | 6 A | |
Powerline FET Type | PMOS | |
SD Pulldown Current | 440 µA | |
Temperature Compensation | Internal Temperature Compensation | Disabled |
External Temperature Compensation | Enabled current dimming mode | |
Current Dimming Knee Point | 6 µA | |
EXT_TEMP_GAIN[3:0] | 14 | |
EXT_TEMP_LEVEL_HIGH[3:0] | 8.49 kΩ | |
EXT_TEMP_LEVEL_LOW[3:0] | N/A | |
VSYNC and PLL | PLL | Disabled 5-MHz oscillator |
VSYNC input | Disabled | |
SYNC or HSYNC | N/A | |
PWM_SYNC | N/A | |
Pre-divider | N/A | |
Slow PLL Divider | N/A | |
R_SEL | N/A | |
SEL_Divider | N/A | |
PWM_FREQ | N/A | |
PWM_RES | N/A |
ADDRESS (HEX) | VALUE (BIN) | VALUE (HEX) |
---|---|---|
60 | 01101111 | 6F |
61 | 11111111 | FF |
62 | 11011100 | DC |
63 | 11000010 | C2 |
64 | 11010111 | D7 |
65 | 11100101 | E5 |
66 | 11111010 | FA |
67 | 01110111 | 77 |
68 | 01110111 | 77 |
69 | 11100001 | E1 |
6A | 10111011 | BB |
6B | 10110111 | B7 |
6C | 00010111 | 17 |
6D | 11101111 | EF |
6E | 10110001 | B1 |
6F | 10001011 | 8B |
70 | 11001001 | C9 |
71 | 10000111 | 87 |
72 | 11100101 | E5 |
73 | 11011000 | D8 |
74 | 01000101 | 45 |
75 | 10000110 | 86 |
76 | 11011110 | DE |
77 | 10101111 | AF |
78 | 00111111 | 3F |
Figure 2-9 shows the use case for the LP8860J-Q1.