SNVA757D August   2017  – September 2020 LP8860-Q1

 

  1. 1LP8860-Q1 Version Summary
  2. 2Specific EEPROM Versions
    1. 2.1  A Version
    2. 2.2  B Version
    3. 2.3  C Version
    4. 2.4  D Version
    5. 2.5  E Version
    6. 2.6  F Version
    7. 2.7  G Version
    8. 2.8  H Version
    9. 2.9  J Version
    10. 2.10 L Version
    11. 2.11 N Version
    12. 2.12 R Version
  3. 3Revision History

2.2 B Version

The LP8860B-Q1 is configured for three strings × 70 mA using a 3.3-V VDD and PWM pin to control brightness. LED current can be adjusted using an ISET resistor. Table 2-3 lists detailed configurations and full EEPROM information for the LP8860B-Q1.

Table 2-3 Detailed EEPROM Configuration for LP8860B-Q1
B
BoostSwitching Current Limit9 A
SYNC InputDisabled
2 × Charge PumpEnabled
Spread SpectrumEnabled
ƒSW300 kHz
VDD3.3 V
Initial Boost Voltage24 V
LED DriverInput Brightness Control MethodPWM pin input
Maximum LED Current per Channel70 mA
ISET Resistor ControlEnabled
Number of Channels3 strings
Channel Phase Shift120 degrees (3 phases)
LED Output Dimming MethodPWM
Current to PWM Switch PointN/A
Current Linearity Correction SlopeN/A
Output PWM Dimming Frequency4.883 kHz
Dimming ResolutionDepends on VSYNC
Drive Strength and Rise Time200 ns
Dimming Ratio1024:1
Sloper105 ms + advanced slope
Driver Headroom VoltageVSAT + 450 mV
Fault HandlingShort LED Fault Threshold10.6 V
VIN OVP Level22.5 V
VIN UVLO Level3 V
VDD UVLO3 V
Input OCP Limit8 A
Powerline FET TypePMOS
SD Pulldown Current440 µA
Temperature CompensationInternal Temperature CompensationEnabled, 100°C
External Temperature CompensationEnabled, current dimming mode
Current Dimming Knee Point6 µA
EXT_TEMP_GAIN[3:0]14
EXT_TEMP_LEVEL_HIGH[3:0]6.69 kΩ
EXT_TEMP_LEVEL_LOW[3:0]N/A
VSYNC and PLLPLLEnabled, 10-MHz PLL
VSYNC inputEnabled
SYNC or HSYNCHSYNC
PWM_SYNC1
Pre-divider7
Slow PLL Divider0
R_SEL3
SEL_DividerFast
PWM_FREQ0
PWM_RES1
Table 2-4 EEPROM Register Values: LP8860B-Q1
ADDRESS (HEX) VALUE (BIN) VALUE (HEX)
60011011106E
610000001002
62010111005C
6311000010C2
64010111005C
6511101100EC
660111100078
670111011177
680111011177
6911100001E1
6A10111111BF
6B0000000000
6C11000000C0
6D11110111F7
6E0000000000
6F0000011107
70000011110F
7111110010F2
7211100101E5
730001000010
740011010135
750000011006
76100010108A
7711011111DF
781000000181

Figure 2-2 shows the use case for the LP8860B-Q1.

GUID-75AB8C70-D0B0-4BE9-899E-6B24C6A35839-low.gifFigure 2-2 Use Case for LP8860B-Q1