SNVA757 Application note

SNVA757D August 2017 – September 2020 LP8860-Q1

2.8 H Version

The LP8860H-Q1 is configured for four strings × 80 mA using a 5-V VDD and PWM pin to control brightness. Table 2-15 lists detailed configurations and full EEPROM information for LP8860H-Q1.

Table 2-15 Detailed EEPROM Configuration: LP8860H-Q1

H
Boost	Switching Current Limit	4 A
	SYNC Input	Disabled
	2 × Charge Pump	Disabled
	Spread Spectrum	Disabled
	ƒ_SW	800 kHz
	VDD	5 V
	Initial Boost Voltage	25 V
LED Driver	Input Brightness Control Method	PWM pin input (direct)
	Maximum LED current per channel	80 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	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	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 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

Table 2-16 EEPROM Register Values: LP8860H-Q1

ADDRESS (HEX)	VALUE (BIN)	VALUE (HEX)
60	11101100	EC
61	11001100	CC
62	01011100	5C
63	11010000	D0
64	11010111	D7
65	11100101	E5
66	01110000	70
67	01110111	77
68	01110111	77
69	01110001	71
6A	00111011	3B
6B	10110111	B7
6C	00010111	17
6D	11101111	EF
6E	00010000	10
6F	10001011	8B
70	11000100	C4
71	00110101	35
72	11100101	E5
73	00010010	12
74	01000101	45
75	11000110	C6
76	10001100	8C
77	11111111	FF
78	00111110	3E

Figure 2-8 shows the use case for the LP8860H-Q1.

Figure 2-8 Use Case for LP8860H-Q1