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参数资料
| 型号： | MAX1517 |
| 厂商： | Maxim Integrated Products, Inc. |
| 元件分类： | DC/DC变换器 |
| 英文描述： | TFT-LCD DC-DC Converters with Operational Amplifiers |
| 中文描述： | TFT-LCD DC-DC转换器，带有运算放大器 |
| 文件页数： | 15/26页 |
| 文件大小： | 919K |
| 代理商： | MAX1517 |
M
TFT-LCD DC-DC Converters with
Operational Amplifiers
______________________________________________________________________________________
15
This discharge condition forces the current through the
inductor to ramp back down, transferring the energy
stored in the magnetic field to the output capacitor and
the load. The MOSFET remains off for the rest of the
clock cycle.
Gate-On Linear-Regulator Controller, REG P
The gate-on linear-regulator controller (REG P) is an
analog gain block with an open-drain n-channel output.
It drives an external pnp pass transistor with a 6.8k
base-to-emitter resistor (Figure 1). Its guaranteed base-
drive sink current is at least 1mA. The regulator including
Q1 in Figure 1 uses a 0.47μF ceramic output capacitor
and is designed to deliver 20mA at 24V. Other output
voltages and currents are possible with the proper pass
transistor and output capacitor. See the
Pass-Transistor
Selection
and
Stability Requirements
sections.
REG P is typically used to provide the TFT-LCD gate
drivers’ gate-on voltage. Use a charge pump with as
many stages as necessary to obtain a voltage exceed-
ing the required gate-on voltage (see the
Selecting the
Number of Charge-Pump Stages
section). Note the
voltage rating of the DRVP is 28V. If the charge-pump
output voltage can exceed 28V, an external cascode
npn transistor should be added as shown in Figure 4.
Alternately, the linear regulator can control an interme-
diate charge-pump stage while regulating the final
charge-pump output (Figure 5).
REG P is enabled after the REF voltage exceeds 1.0V.
Each time it is enabled, the controller goes through a
soft-start routine that ramps up its internal reference
DAC in 128 steps.
Q
R
S
RESET DOMINANT
CURRENT
SENSE
Σ
OSCILLATOR
SLOPE COMP
CLOCK
LX
PGND
FB
COMP
1.236V
1.0V
SOFT-
START
V
LIMIT
PWM
COMPARATOR
FAULT
COMPARATOR
ILIM
COMPARATOR
TO FAULT LATCH
ERROR AMP
Figure 3. Step-Up Regulator Functional Diagram
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1517ETJ | TFT-LCD DC-DC Converters with Operational Amplifiers |
| MAX1518 | TFT-LCD DC-DC Converters with Operational Amplifiers |
| MAX1518ETJ | TFT-LCD DC-DC Converters with Operational Amplifiers |
| MAX151AENG | LJT 18C 18#20 SKT PLUG |
| MAX151BCNG | 300kHz 10-Bit A/D Converter with Refrence and T/H |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1517AETJ+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1517ETJ | 功能描述:LCD 驱动器 RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| MAX1517ETJ+ | 功能描述:LCD 驱动器 TFT-LCD DC-DC Conv w/Op Amps RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| MAX1517ETJ+G104 | 功能描述:LCD 驱动器 TFT-LCD DC-DC Converters with Operational Amplifiers RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| MAX1517ETJ+T | 功能描述:LCD 驱动器 TFT-LCD DC-DC Conv w/Op Amps RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
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