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首页TI LP5036-TI1: 12位超低功耗I2C RGB LED驱动器
TI LP5036-TI1: 12位超低功耗I2C RGB LED驱动器
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更新于2024-07-01
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IC-LED驱动器LP5036-TI1是一款高性能的12位PWM电流驱动器,专为低功耗和精确控制RGB LED应用设计。该驱动器的特点包括: 1. 工作电压范围:LP5036兼容多种电源轨,如1.8V、3.3V和5V,提供广泛的电压适应性。其输入电压范围广泛,从2.7V到5.5V,确保了设备在各种系统中的稳定运行。 2. 高精度电流驱动:它具有36路高精度恒定电流源,每个通道电流可达25.5mA,当VCC大于3.3V时,电流可提升到35mA。驱动器具有良好的电流控制精度,器件间误差和通道间误差控制在±5%以内。 3. 极低静态电流:在关断模式下,静态电流低至1μA(最大值),而在省电模式下,当EN信号为高且所有LED关闭超过30ms时,电流仅消耗12μA,显著节省电能。 4. 12位PWM发生器:每个通道配备独立的12位PWM控制器,支持29kHz频率,每个RGB模块有独立的色彩混合和亮度控制寄存器,允许灵活的色彩和亮度调节,可以选择对数或线性标度。 5. 高级功能:包括三个可编程组(R、G、B)以实现软件控制,两个外部地址引脚支持最多4个器件的连接,广播功能可同时配置多个器件,以及自动递增功能便于多寄存器操作。 6. 高速通信:支持高达400kHz的I2C快速模式,适用于智能扬声器、智能家居等设备中的LED照明、指示灯和闪烁控制。 这款驱动器在设计时考虑到了低功耗、精确控制和灵活的接口选项,特别适合那些需要高效能、高效率和高可靠性的LED应用场合。使用前务必查阅最新的英文数据手册以获取最准确的设计指导,因为TI公司强调官方英文版本的优先地位,并提醒用户翻译可能存在误差。
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Output Pin Voltage (V)
Output Current (A)
0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5
0
0.005
0.01
0.015
0.02
0.025
0.03
0.035
0.04
0.045
0.05
0.055
D007
50-PA I
REF
100-PA I
REF
150-PA I
REF
200-PA I
REF
250-PA I
REF
300-PA I
REF
350-PA I
REF
11
LP5030
,
LP5036
www.ti.com.cn
ZHCSIQ2B –SEPTEMBER 2018–REVISED JANUARY 2019
版权 © 2018–2019, Texas Instruments Incorporated
Typical Characteristics (接接下下页页)
V
VCC
= 5 V
图图 8. OUT Pin Voltage vs Current
![](https://csdnimg.cn/release/download_crawler_static/86295896/bgc.jpg)
OUT0
VLED
12 Bits
29 kHz
PWM
Generators
VCC
Bandgap
IREF Setting Current
Digital
Interface
V1P8
LDO
Digital Control
Oscillator
15MHz
Thermal Shutdown
OUT1
OUT2
OUT33
OUT34
OUT35
GND
VCC
VCAP
EN
SDA
SCL
ADDR0
ADDR1
IREF
12
LP5030
,
LP5036
ZHCSIQ2B –SEPTEMBER 2018 –REVISED JANUARY 2019
www.ti.com.cn
版权 © 2018–2019, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The LP503x device is a 30- or 36-channel constant-current-sink LED driver. The LP503x device includes all
necessary power rails, an on-chip oscillator, and a two-wire serial I
2
C interface. The maximum constant-current
value of all channels is set by a single external resistor. Two hardware address pins allow up to four devices on
the same bus. An automatic power-saving mode is implemented to keep the total current consumption under 10
µA, which makes the LP503x device a potential choice for battery-powered end-equipment.
The LP503x device is optimized for RGB LEDs regarding both live effects and software efforts. The LP503x
device controls each LED output with 12-bit PWM resolution at 29-kHz switching frequency, which helps achieve
a smooth dimming effect and eliminates audible noise. The independent color-mixing and intensity-control
registers make the software coding straightforward. When targeting a fade-in, fade-out type breathing effect, the
global RGB bank control reduces the microcontroller loading significantly. The LP503x device also implements a
PWM phase-shifting function to help reduce the input power budget when LEDs turn on simultaneously.
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 Each Channel PWM Control
Most traditional LED drivers are designed for the single-color LEDs, in which the high resolution PWM generator
is used for intensity control only. However, for RGB LEDs, both the color mixing and intensity control should be
addressed to achieve the target effect. With the traditional solution, the users must handle the color mixing and
intensity control simultaneously with a single PWM register. Several undesired effects occur: the limited dimming
steps, the complex software design, and the color distortion when using a logarithmic scale control.
The LP503x device is designed with independent color mixing and intensity control, which makes the RGB LED
effects fancy and the control experience straightforward. With the inputs of the color-mixing register and the
intensity-control register, the final PWM generator output for each channel is 12-bit resolution and 29-kHz
dimming frequency, which helps achieve a smooth dimming effect and eliminates audible noise. See 图 9.
![](https://csdnimg.cn/release/download_crawler_static/86295896/bgd.jpg)
OUT0
8 Bits Color
8 Bits Color
8 Bits Color
8 Bits Color
8 Bits Color
8 Bits Color
8 Bits Brightness
8 Bits Brightness
Color-Mixing Brightness-Control
12 Bits / 29KHz PWM
12 Bits / 29KHz PWM
12 Bits / 29KHz PWM
12 Bits / 29KHz PWM
12 Bits / 29KHz PWM
12 Bits / 29KHz PWM
PWM Generators
OUT1
OUT2
OUT33
OUT34
OUT35
13
LP5030
,
LP5036
www.ti.com.cn
ZHCSIQ2B –SEPTEMBER 2018–REVISED JANUARY 2019
版权 © 2018–2019, Texas Instruments Incorporated
Feature Description (接接下下页页)
图图 9. PWM Control Scheme for Each Channel
8.3.1.1 Independent Color Mixing Per RGB LED Module
Each output channel has its own individual 8-bit color-setting register (OUTx_COLOR). The device allows every
RGB LED module to achieve >16 million (256 × 256 × 256) color-mixing.
8.3.1.2 Independent Intensity Control Per RGB LED Module
When color is fixed, the independent intensity-control is used to achieve accurate and flexible dimming control for
every RGB LED module.
8.3.1.2.1 Intensity-Control Register Configuration
Every three consecutive output channels are assigned to their respective intensity-control register
(LEDx_BRIGHTNESS). For example, OUT0, OUT1, and OUT2 are assigned to LED0_BRIGHTNESS, so it is
recommended to connect the RGB LEDs in the sequence as shown in 表 1. The LP503x device allows 256-step
intensity control for each RGB LED module, which helps achieve a smooth dimming effect.
Keeping FFh (default value) in the LED0_BRIGHTNESS register results in 100% dimming duty cycle. With this
setting, the users can just configure the color mixing register by channel to achieve the target dimming effect in a
single-color LED application.
8.3.1.2.2 Logarithmic- or Linear-Scale Intensity Control
For human-eye-friendly visual performance, a logarithmic-scale dimming curve is usually implemented in LED
drivers. However, for RGB LEDs, if using a single register to achieve both color mixing and intensity control,
color distortion can be observed easily when using a logarithmic scale. The LP503x device, with independent
color-mixing and intensity-control registers, implements the logarithmic scale dimming control inside the intensity
control function, which solves the color distortion issue effectively. See 图 10. Also, the LP503x device allows
users to configure the dimming scale either logarithmically or linearly through the global Log_Scale_EN register
bit. If a special dimming curve is desired, using the linear scale with software correction is the most flexible
approach. See 图 11.
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