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参数资料
| 型号： | MAX8798EVCMAXQU+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 21/31页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MAX8798 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | 特殊用途 DC/DC，LCD 电源 |
| 输出及类型： | 4，非隔离 |
| 功率 - 输出： | 3.56W |
| 输出电压： | 8V，3.2V，21V，-13V |
| 电流 - 输出： | 300mA，150mA，20mA，20mA |
| 输入电压： | 1.8 ~ 6 V |
| 稳压器拓扑结构： | 升压 |
| 频率 - 开关： | 1.2MHz |
| 板类型： | 完全填充 |
| 已供物品： | 2 板，CD |
| 已用 IC / 零件： | MAX8798 |
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Internal-Switch Boost Regulator with
Integrated 3-Channel Scan Driver for TFT LCDs
GOFF Rapid Discharge Function
(DISH Input)
The DISH input controls a switch between GOFF and
GND. When DISH is pulled below ground by at least
1V, GOFF is rapidly discharged to GND. Typically,
DISH is capacitively coupled to IN so that if IN falls
suddenly, GOFF is discharged to blank the display
(Figure 3).
VCOM Calibrator
The VCOM calibrator is a solid-state alternative to
mechanical potentiometers used for adjusting the LCD
backplane voltage (VCOM) in TFT LCD displays. OUT
attaches to the external resistive voltage-divider at POS
and sinks a programmable current (I OUT ), which sets the
VCOM level (Figure 6). An internal 7-bit DAC controls the
sink current and allows the user to increase or decrease
the VCOM level. The DAC is ratiometrically relative to
V BOOST and is monotonic over all operating conditions.
The user can store the DAC setting in an internal
EEPROM. On power-up, the EEPROM presets the DAC
to the last stored setting. The 2-wire I 2 C interface
between the system controller and the programming cir-
cuit adjusts the DAC and programs the EEPROM when
WPN is high.
The resistive voltage-divider and the BOOST supply set
the maximum value of VCOM. OUT sinks current from the
voltage-divider to reduce the POS voltage level and
VCOM output. The external resistor at SET (R SET ) sets the
full-scale sink current and the minimum value of VCOM.
The GON input provides the high voltage required to
program the EEPROM. To allow programming, V GON is
connected to the TFT LCD V GON supply. V GON should
be between 16.1V and 35V. EEPROM programming is
disabled when V GON is below 15.5V (typ). Bypass
V GON to PGND or BOOST (that is bypassed to PGND)
with a 0.1μF or greater capacitor.
Thermal-Overload Protection
The thermal-overload protection prevents excessive
power dissipation from overheating the device. When
the junction temperature exceeds T J = +160°C, a ther-
mal sensor immediately activates the fault protection
that shuts down the step-up regulator, switch control
block, operational amplifier, and the internal linear reg-
ulator, allowing the device to cool down. Once the
device cools down by approximately 15°C, cycle the
input voltage (below the UVLO falling threshold) to
clear the fault latch and reactivate the device.
The thermal-overload protection protects the controller
in the event of fault conditions. For continuous opera-
tion, do not exceed the absolute maximum junction
temperature rating of T J = +150°C.
V DD
V DD
V MAIN
V DD
LINEAR
REGULATOR
19R
BOOST
NEG
SDA
VCOM
VCOM
SCL
WPN
I2C
CONTROL
INTERFACE
7
DAC
R
R3
I 2 C BUS
SCLS
POS
OUT
WPP
EEPROM
BLOCK
R4
7
SET
GON
R SET
VGON
Figure 6. VCOM Calibrator Functional Diagram
______________________________________________________________________________________
21
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| MAX8798EVCMAXQU+ | 功能描述:显示开发工具 MAX8798 Eval Kit RoHS:否 制造商:4D Systems 产品:4Display Shields 工具用于评估:?OLED-160-G1, ?OLED-160-G2 接口类型:Serial 工作电源电压:5 V |
| MAX8798EVKIT+ | 功能描述:显示开发工具 MAX8798 Eval Kit RoHS:否 制造商:4D Systems 产品:4Display Shields 工具用于评估:?OLED-160-G1, ?OLED-160-G2 接口类型:Serial 工作电源电压:5 V |
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| MAX8799GTI+ | 制造商:Maxim Integrated Products 功能描述:MAXIM MAX8799GTI+ VOLTAGE REFERENCES - Rail/Tube 制造商:Maxim Integrated Products 功能描述:SINGLE-PHASE AMD CPU - Rail/Tube 制造商:Maxim Integrated Products 功能描述:Maxim MAX8799GTI+ Voltage References |
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