LP5813 datasheet(13/60 Pages) TI

13 / 60 page

9.2 Functional Block Diagram

Undervoltage

Lockout (UVLO)

VIN

Interface and

Digital Core

Thermal

Shutdown

(TSD)

SCL

SDA

SYNC

Over voltage

and short

circuit

protection

Boost

Switches

Control

Gate

Driver

VOUT

Valley

Current

Sense

1.5V LDO

VOUT

Selection

–

VREF

0.6V

Soft Startup

Manual

mode 8-bit

Dot Current

(DC)

8-bit Individual PWM

Autonomous Animation

Engine Control

Time-cross-multiplexing (TCM)

GND

1-bit

Maximum

Current

(MC)

OUT0

OUT1

OUT2

OUT3

De-ghosting

LOD/LSD

6-MHz

Oscillator

Autonomous

mode 8-bit

Dot Current

(DC)

VDDIO

VOUT

Figure 9-1. Functional Block Diagram

9.3 Feature Description

9.3.1 Synchronous Boost Converter

The integrated synchronous boost converter is designed to operate with 0.5 V to 5.5 V input voltage supply with

1.6 A (typ.) valley switch current limit. The LP5813 operates at quasi-constant frequency pulse width modulation

(PWM) mode, when driving moderate and heavy load. The switching frequency is 1 MHz when the input voltage

is above 1.5 V. The frequency is reduced to 0.5 MHz gradually when the input voltage decreases from 1.5 V

to 1 V, and keeps at 0.5 MHz when the input voltage is below 1 V. At light load conditions, the boost converter

operates at pulse frequency modulation (PFM) mode. During PWM operation, the converter works at adaptive

constant on-time valley current mode to achieve excellent line regulation and load regulation, by which a smaller

inductor and ceramic capacitors can be supported. Internal loop compensation simplifies the design complexity,

and also minimizes the external components.

When powering up, the default output voltage is 3 V. The output voltage can be configured at ‘Dev_config_0’

power not only the LEDs driven by the device itself, but also other loads in the system.

9.3.1.1 Undervoltage Lockout

The LP5813 has a built-in undervoltage lockout (UVLO) circuit to make sure the device working properly. When

the input voltage is above the UVLO rising threshold 1.8 V, the boost of LP5813 can be enabled. After the

LP5813 completes soft-start process and the output voltage rises above 2.2 V, the LP5813 can work with the

input voltage down to 0.5 V. When the input voltage is below UVLO falling threshold 0.4 V, the device shuts

down.

www.ti.com

LP5813

SNVSC74 – SEPTEMBER 2023

Submit Document Feedback

Product Folder Links: LP5813

LP5813 датащи(PDF) 13 Page - Texas Instruments

LP5813 датащи(HTML) 13 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

датащи скачать

ссылки URL