LP8556 datasheet(46/63 Pages) TI1

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LP8556

SNVS871I – JULY 2012 – REVISED MARCH 2016

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Table 13. Setting Full-Scale LED Current with EEPROM

ISET_EN

CURRENT_MAX

CURRENT[11:0]

FULL-SCALE ILED [mA]

FFFh

100

FFFh

101

FFFh

110

FFFh

111

FFFh

000 – 111

001h – FFFh

(CURRENT/4095) × CURRENT_IMAX

9.1.2 Using LP8556 With Configuration Resistors and IO Pins

9.1.2.1 Setting Boost Switching and PWM Dimming Frequencies

Boost switching and PWM dimming frequencies can be set via resistor when BOOST_FSET_EN = 1 and

PWM_FSET_EN = 1. Available options are shown in Table 14.

Table 14. Configuring PWM Dimming Frequency With an External Resistor

RFSET [k

Ω]

(TOLERANCE)

ƒSW [kHz]

BOOST_FSET_EN = 1

ƒPWM [Hz] (RESOLUTION)

PWM_FSET_EN = 1

Floating or FSET pin pulled HIGH

1250

9616 (10-bit)

470 k - 1 M (±5%)

312

2402 (12-bit)

300 k, 330 k (±5%)

312

4808 (11-bit)

200 k (±5%)

312

6010 (10-bit)

147 k, 150k, 154 k, 158k (±1%)

312

9616 (10-bit)

121 k (±1%)

312

12020 (9-bit)

100 k (±1%)

312

14424 (9-bit)

86.6 k (±1%)

312

16828 (9-bit)

75 k (±1%)

312

19232 (9-bit)

63.4 k (±1%)

625

2402 (12-bit)

52.3 k, 53.6 k (±1%)

625

4808 (11-bit)

44.2k, 45.3 k (±1%)

625

6010 (10-bit)

39.2 k (±1%)

625

9616 (10-bit)

34 k (±1%)

625

12020 (9-bit)

30.1k (±1%)

625

14424 (9-bit)

26.1 k (±1%)

625

16828 (9-bit)

23.2 k (±1%)

625

19232 (9-bit)

20.5 k (±1%)

1250

2402 (12-bit)

18.7 k (±1%)

1250

4808 (11-bit)

16.5k (±1%)

1250

6010 (10-bit)

14.7 k (±1%)

1250

9616 (10-bit)

13 k (±1%)

1250

12020 (9-bit)

11.8k (±1%)

1250

14424 (9-bit)

10.7 k (±1%)

1250

16828 (9-bit)

9.76 k (±1%)

1250

19232 (9-bit)

FSET pin shorted to GND

1250

Same as PWM input frequency

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