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参数资料
| 型号： | MAX17061AETI+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 16/24页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 8 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1MHz |
| 电源电压： | 4.5 V ~ 26 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
8-String White LED Driver with
SMBus for LCD Panel Applications
DPWM Frequency Setting
The MAX17061A uses an internal DPWM signal to per-
form dimming control. The DPWM frequency is specified
by an external resistor connected from FSET pin to GND:
SMBus, it automatically remains off. In this low-power
state, most of the control circuits are turned off. Even in
PWM dimming mode, only the PWMI interface is used for
brightness control; the MAX17061A cannot run without the
f DPWM =
10 9
α × R [ Ω ] + γ
SMBus interface. For sister products without the SMBus
interface, contact MAXIM Integrated Products, Inc.
where: α = 10.638
γ = 58509
The adjustable range for the FSET resistor, R FSET , is
from 42k Ω to 464k Ω , corresponding to the DPWM fre-
quency of 200Hz to 2kHz.
Dimming Control Interfaces
The MAX17061A’s dimming control circuit consists of
two interfaces: PWM and SMBus. The block diagram of
these two input interfaces is shown in Figure 4. The
dimming can be performed in three modes: PWM,
SMBus, or DPST. In PWM mode, the brightness is
adjusted by the PWM signal applied to the PWMI pin. In
SMBus mode, the brightness is adjusted by a com-
mand from uplink processor through the 2-wire SMBus.
In DPST mode, the brightness is adjusted by the prod-
uct of the PWM duty cycle and SMBus command value.
This DPWM control provides a dimming range with 8-bit
resolution down to 2.7% and supports Intel DPST to
maximize battery life.
The SMBus interface can be used to adjust the dimming,
as well as shut down the MAX17061A. Before the
MAX17061A receives a turn-on command from the
PWMO
Dimming Control Register Descriptions
The MAX17061A includes four registers to monitor and
control brightness, fault status, identification, and oper-
ating mode. The slave address is 0b0101100.
The MAX17061A uses two multiplexers internally to
direct the dimming signal processing (Figure 4). These
two multiplexers are controlled by 2 bits of the device
control register, PWM_SEL, and PWM_MD, respectively.
The PWM_SEL bit selects either the SMBus or the PWM
input to control the brightness. The PWM_MD bit
selects the mode in which the PWM input is to be inter-
preted. Table 2 provides a complete setting of the three
dimming modes (X means don’t care).
In PWM mode, the output LED brightness is solely con-
trolled by the percentage duty cycle of the input signal
to PWMI. In SMBus mode, the input of PWMI has no
effect on the dimming control, and only the SMBus
command to brightness control register adjusts the out-
put brightness. In DPST mode, the overall brightness
level is the normalized product of the SMBus command
setting and PWM input duty cycle. The PWM signal
starts from 100% when operating in DPST mode.
BUFFER
DIGITAL
DPWM
SETTING
PWMI
A
D
<=1
1
MUX
MULTIPLIER
MUX
SMBus AND PWM INPUT BLOCK
PWM_MD
PWM_SEL
BACKLIGHT
ON/OFF
SDA
SCL
IDENTIFICATION
REGISTER
0x03
FAULT/STATUS
REGISTER
0x02
SMBus
INTERFACE
DEVICE
CONTROL
REGISTER
0x01
BRIGHTNESS
CONTROL
REGISTER
0x00
Figure 4. MAX17061A PWM and SMBus Interface Circuit
16
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相关代理商/技术参数 |
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| MAX17061AEVCMAXQU+ | 功能描述:LED 照明开发工具 Evaluation Kit/Evaluation system for MAX17061A RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MAX17061AEVKIT+ | 功能描述:LED 照明开发工具 MAX17061A Eval Kit RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MAX17061ETI+ | 功能描述:LED照明驱动器 8-String White LED Driver w/SMBus RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX17061ETI+T | 功能描述:LED照明驱动器 8-String White LED Driver w/SMBus RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX17061EVCMAXQU+ | 功能描述:LED 照明开发工具 Evaluation Kit/Evaluation System for the MAX17061 RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
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