LP5569 datasheet(18/86 Pages) TI1

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tJITTER

1/fPWM

D/fPWM

D is tJITTER x fPWM or equal to #/6%¶V = ¨' [ 2048 codes.

For 11-bit resolution, #LSBs is equal to a hysteresis setting of LN(#/6%¶V)/LN(2).

For example, with a tJITTER of 1 µs and a fPWM of 5 kHz, the hysteresis setting should be:

LN(1 µ s x 5 kHz x 2048)/LN(2) = 3.35 (4 LSBs).

tJITTER

LP5569

SNVSAP8 – JULY 2017

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Product Folder Links: LP5569

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Feature Description (continued)

Table 1. PWM Input Hysteresis

HYSTERESIS

SETTING

(0x80 bits

[2:0])

MIN. CHANGE IN PWM PULSE

DURATION (Δt) REQUIRED TO

CHANGE LED CURRENT,

AFTER DIRECTION CHANGE

(for fPWM < 11.7 kHz)

MIN. CHANGE

IN PWM DUTY

CYCLE (ΔD)

REQUIRED TO

CHANGE LED

CURRENT

AFTER

DIRECTION

CHANGE

MIN (ΔILED), INCREASE FOR INITIAL CODE

EXPONENTIAL MODE

LINEAR MODE

000 (0 LSB)

1 / (fPWM × 2047)

0.05%

0.3%

0.05%

001 (1 LSB)

1 / (f PWM× 1023)

0.1%

0.61%

0.1%

010 (2 LSB)

1 / (fPWM × 511)

0.2%

1.21%

0.2%

011 (3 LSB)

1 / (fPWM × 255)

0.39%

2.4%

0.39%

100 (4 LSB)

1 / (fPWM × 127)

0.78%

4.74%

0.78%

101 (5 LSB)

1 / (fPWM × 63)

1.56%

9.26%

1.56%

110 (6 LSB)

1 / (fPWM × 31)

3.12%

17.66%

3.12%

Figure 10. PWM Hysteresis Example

EN/PWM Input Timeout

The EN/PWM input timeout feature has two operating modes as follows:

•

STANDBY state: EN/PWM low for > 15 ms shuts down the LP5569 device and returns to the DISABLED

state (see Figure 13).

LP5569 Datasheet(PDF) 18 Page - Texas Instruments

LP5569 Datasheet(HTML) 18 Page - Texas Instruments

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