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8-String White LED Driver with
SMBus for LCD Panel Applications
Pin Description (continued)
PIN
22
23
24
25
26
27
28
—
NAME
V DD
V CC
CCV
OV
ISET
FB1
FB2
EP
FUNCTION
Boost Regulator MOSFET Gate Drive Supply. Bypass V DD to GND with a ceramic capacitor of 1μF or greater.
5V Control Supply Input. V CC provides power to the MAX17061A. Bypass V CC to GND with a ceramic
capacitor of 1 μF or greater.
Step-Up Converter Compensation Pin. Connect a 0.022 μF ceramic capacitor and 5.1k resistor from CCV
to GND. When the MAX17061A shuts down, CCV is discharged to 0V through an internal 20k resistor.
Overvoltage Sense. Connect OV to the center tap of a resistive voltage-divider from V OUT to ground. The
detection threshold for voltage limiting at OV is 1.236V (typ).
Full-Scale LED Current Adjustment Pin. The resistance from ISET to GND controls the full-scale current in
each LED string:
I LEDMAX = 20mA x 200k /R ISET
The acceptable resistance range is 133k
< R ISET < 266k , which corresponds to full-scale LED current
of 30mA > I LEDMAX > 15mA. Connect ISET to V CC for a default full-scale LED current of 25mA.
LED String 1 Cathode Connection. FB1 is the open-drain output of an internal regulator, which controls
current through FB1. FB1 can sink up to 30mA. If unused, connect FB1 to V CC .
LED String 2 Cathode Connection. FB2 is the open-drain output of an internal regulator, which controls
current through FB2. FB2 can sink up to 30mA. If unused, connect FB2 to V CC .
Exposed Backside Pad. Solder to the circuit board ground plane with sufficient copper connection to
ensure low thermal resistance. See the PCB Layout Guidelines section.
Detailed Description
The MAX17061A is a high-efficiency driver for arrays of
white LEDs. It contains a fixed-frequency current- mode
PWM step-up controller, dimming control circuit, SMBus
interface, internal power MOSFET, and eight regulated
current sources (see Figure 2). When enabled, the step-
up controller boosts the output voltage to provide suffi-
cient headroom for the current sources to regulate their
respective string currents. The MAX17061A features
selectable switching frequency (500kHz, 750kHz, or
1MHz), which allows trade-offs between external com-
ponent size and operating efficiency.
WLED brightness is controlled by turning the WLEDs
on and off with a DPWM signal. The DPWM frequency
can be accurately adjusted with a resistor. The bright-
ness of the LEDs is proportional to the duty cycle of the
DPWM signal, which is controlled externally through
either a PWM or 2-wire SMBus-compatible interface, or
both. When both interfaces are used at the same time,
the product of the PWM duty cycle and SMBus com-
mand value is used for the dimming control. This
DPWM control scheme provides a full dimming range
with 8-bit resolution.
The MAX17061A has multiple features to protect the
controller from fault conditions. Separate feedback
loops limit the output voltage in all circumstances. The
MAX17061A checks each FB_ voltage during the opera-
tion. If one or more strings are open, the corresponding
FB_ voltages are pulled below 175mV (typ), and open-
circuit fault is detected. As a result, the respective cur-
rent sources are disabled. When one or more LEDs are
shorted and the FB_ voltage exceeds 1.1 x V CC , short
fault is detected and the respective current source is
disabled. In either LED open or short conditions, the
fault strings are disabled while other strings can still
operate normally. The controller features cycle-by-
cycle current limit to provide stable operation and soft-
start protection. In a current-limit condition, the
controller shuts down after a 128μs overcurrent fault
timer expires. A thermal-shutdown circuit provides
another level of protection.
The MAX17061A requires an external 5V supply to pro-
vide the internal bias and gate drive for the step-up
controller.
______________________________________________________________________________________
11
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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:
MAX17061EVKIT+ 功能描述:LED 照明开发工具 MAX17061 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:
MAX17062ETB+ 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:TFT-LCD STEP-UP DC-DC CONVERTER - Rail/Tube
MAX17062ETB+T 功能描述:直流/直流开关转换器 TFT-LCD Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT