LP5891 datasheet(18/74 Pages) TI

18 / 74 page

Table 7-4. Line Switch Time (continued)

LINE_SW

GCLK

Numbers

T_SW (us, 40

MHZ GCLK)

T_SW (us, 60 MHZ

GCLK)

T_SW (us, 100 MHZ

GCLK)

T_SW (us, 120 MHZ

GCLK)

T_SW (us, 160 MHZ

GCLK)

1010b

330

8.25

5.511

3.3

2.739

2.079

1011b

360

6.012

3.6

2.988

2.268

1100b

390

9.75

6.513

3.9

3.237

2.457

1101b

420

10.5

7.014

4.2

3.486

2.646

1110b

450

11.25

7.515

4.5

3.735

2.835

1111b

480

8.016

4.8

3.984

3.024

7.3.5 Protections and Diagnostics

7.3.5.1 Thermal Shutdown Protection

The thermal shutdown (TSD) function turns off all IC constant-current outputs when the junction temperature (TJ)

exceeds 170°C (typical). The function resumes normal operation when TJ falls below 155°C (typical).

7.3.5.2 IREF Resistor Short Protection

The IREF resistor short protection (ISP) function prevents unwanted large currents from flowing through the

constant-current output when the IREF resistor is shorted accidently. The LP5891 device turns off all output

channels when the IREF pin voltage is lower than 0.19 V (typical). When the IREF pin voltage goes higher than

0.325 V (typical), the LP5891 device resumes normal operation.

7.3.5.3 LED Open Load Detection and Removal

7.3.5.3.1 LED Open Detection

The LED Open Detection (LOD) function detects faults caused by an open circuit in any LED, or a short from

OUTn to VLED with low impedance. This function was realized by comparing the OUTn voltage to the LOD

detection threshold voltage level set by LODVTH_R/LODVTH_G/LODVTH_B (See FC3 for more details). If the

OUTn voltage is higher than the programmed voltage, the corresponding output LOD bit is set to 1 to indicate

an open LED. Otherwise, the output of that LOD bit is 0. LOD data output by the detection circuit are valid only

during the OUTn turning on period.

Figure 7-8 shows the equivalent circuit of LED open detection.

LP5891

SLDS269A – MARCH 2022 – REVISED MAY 2022

www.ti.com

Submit Document Feedback

Product Folder Links: LP5891

LP5891 Datasheet(PDF) 18 Page - Texas Instruments

LP5891 Datasheet(HTML) 18 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74

Datasheet Download

Link URL