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参数资料
| 型号： | MAX8790ETP+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 20-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 6 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1MHz |
| 电源电压： | 4.5 V ~ 5.5 V，5.5 V ~ 26 V |
| 输出电压： | 5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 1424 (CN2011-ZH PDF) |
Six-String White LED Driver with Active
Current Balancing for LCD Panel Applications
Fixed-Frequency Step-Up Controller
The MAX8790’s fixed-frequency, current-mode, step-up
controller automatically chooses the lowest active FB_
voltage to regulate the feedback voltage. Specifically,
the difference between the lowest FB_ voltage and the
current source-control signal plus an offset (V SAT ) is
integrated at the CCV output. The resulting error signal
is compared to the external switch current plus slope
compensation to terminate the switch on-time. As the
load changes, the error amplifier sources or sinks cur-
rent to the CCV output to adjust the required peak
inductor current. The slope-compensation signal is
added to the current-sense signal to improve stability at
high duty cycles.
At light loads, the MAX8790 automatically skips pulses
to improve efficiency and prevent overcharging the out-
put capacitor. In SKIP mode, the inductor current ramps
up for a minimum on-time of approximately 150ns, then
discharges the stored energy to the output. The switch
remains off until another pulse is needed to boost the
output voltage.
Internal 5V Linear Regulator
V CC and UVLO
The MAX8790 includes an internal low-dropout linear
regulator (V CC ). When V IN is higher than 5.5V and
SHDN is high, this linear regulator generates a 5V sup-
ply to power an internal PWM controller, control logic,
and MOSFET driver. This linear regulator can deliver at
least 10mA of total additional load current. If V IN is less
than or equal to 5.5V, V CC and IN can be connected
together and powered from an external 5V supply.
There is an internal diode from V CC to IN, so V IN must
be greater than V CC (see Figure 2).
The MAX8790 includes UVLO protection. The controller
is disabled until V CC exceeds the UVLO threshold of
4.25V (typ). Hysteresis on UVLO is approximately 20mV.
The V CC pin should be bypassed to GND with a 1μF or
greater ceramic capacitor.
V IN
2.8V TO 5.5V
C IN
L1
0.9 μ H
D1
C OUT
V OUT
UP TO 22V
SHDN
IN
EXT
N1
EXTERNAL
5V SUPPLY
511k Ω
1 μ F
N.C.
V CC
ENA
ISET
BRT
FSET
OSC
CS
GND
R S
30m Ω
R1
1M Ω
OV
1.2k Ω
CCV
MAX8790
R2
59k Ω
0.1 μ F
FB1
CPLL
0.1 μ F
EP
Figure 3. Low-Input-Voltage Application Circuit
FB2
FB3
FB4
FB5
FB6
12
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相关PDF资料 |
PDF描述 |
|---|---|
| MAX8790AETP+ | IC LED DRVR WHITE BCKLGT 20-TQFN |
| V110C5C75BL | CONVERTER MOD DC/DC 5V 75W |
| P51-200-A-L-MD-20MA-000-000 | SENSOR 200PSI M10-1.25 6H 4-20MA |
| V48C24C75BL | CONVERTER MOD DC/DC 24V 75W |
| V48C5C75BL | CONVERTER MOD DC/DC 5V 75W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8790ETP+ | 功能描述:LED照明驱动器 Six-String White LED Driver 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 |
| MAX8790ETP+T | 功能描述:LED照明驱动器 Six-String White LED Driver 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 |
| MAX8790EVKIT+ | 功能描述:LED 照明开发工具 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: |
| MAX8791AGTA+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX8791AGTA+T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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