SNVA757D Application note | 德州仪器 TI.com.cn

SNVA757D August 2017 – September 2020 LP8860-Q1

2.1 A Version

The LP8860A-Q1 is configured for four strings × 130 mA using a 5-V VDD and I²C or SPI to control brightness. Table 2-1 lists detailed configurations and full EEPROM information for the LP8860A-Q1.

Table 2-1 Detailed EEPROM Configuration: LP8860A-Q1

A
Boost	Switching Current Limit	9 A
	SYNC Input	Disabled
	2 × Charge Pump	Disabled
	Spread Spectrum	Disabled
	ƒ_SW	300 kHz
	VDD	5 V
	Initial Boost Voltage	31.5 V
LED Driver	Input Brightness Control Method	I²C/SPI BRT Register
	Maximum LED Current per Channel	130 mA
	ISET Resistor Control	Disabled
	Number of Channels	4 strings
	Channel Phase Shift	90 degrees (4 phases)
	LED Output Dimming Method	PWM
	Current to PWM Switch Point	N/A
	Current Linearity Correction Slope	N/A
	Output PWM Dimming Frequency	4.883 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	V_SAT + 50 mV
Fault Handling	Short LED Fault Threshold	10.6 V
	VIN OVP Level	22.5 V
	VIN UVLO Level	3 V
	VDD UVLO	3 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	Disabled
	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

Table 2-2 EEPROM Register Values: LP8860A-Q1

ADDRESS (HEX)	VALUE (BIN)	VALUE (HEX)
60	11101101	ED
61	11011111	DF
62	11011100	DC
63	11110000	F0
64	11011111	DF
65	11100101	E5
66	11110010	F2
67	01110111	77
68	01110111	77
69	01110001	71
6A	00111111	3F
6B	10110111	B7
6C	00010111	17
6D	11101111	EF
6E	10110000	B0
6F	10000111	87
70	11001110	CE
71	01110010	72
72	11100101	E5
73	11011111	DF
74	00110101	35
75	00000110	06
76	11011100	DC
77	10001000	88
78	00111110	3E

Figure 2-1 shows the use case for the LP8860A-Q1

Figure 2-1 Use Case for LP8860A-Q1