LP8556 datasheet(20/63 Pages) TI1

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LP8556

SNVS871I – JULY 2012 – REVISED MARCH 2016

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See Table 5.

8.3.2.7 Setting PWM Dimming Frequency

LP8556 PWM dimming frequency can be set by an external resistor, RFSET, or by pre-configuring EPROM

Memory (CFG5 register, PWM_FREQ[3:0] bits). Table 4 summarizes setting of the PWM dimming frequency.

Note that .

NOTE

The RFSET is shared for setting the boost switching frequency, too. Setting the boost

switching frequency and PWM dimming frequency using an external resistor is shown in

Table 5.

Table 4. Configuring PWM Dimming Frequency via EPROM

RFSET [kΩ]

PWM_FSET_EN

PWM_FREQ[3:0]

ƒPWM [Hz] (Resolution)

don't care

0000

4808 (11-bit)

0001

6010 (10-bit)

0010

7212 (10-bit)

0011

8414 (10-bit)

0100

9616 (10-bit)

0101

12020 (9-bit)

0110

13222 (9-bit)

0111

14424 (9-bit)

1000

15626 (9-bit)

1001

16828 (9-bit)

1010

18030 (9-bit)

1011

19232 ((9-bit)

1100

24040 (8-bit)

1101

28848 (8-bit)

1110

33656 (8-bit)

1111

38464 (8-bit)

See(1)

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See(1)

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