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参数资料
| 型号： | MAX8795AGCJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/31页 |
| 文件大小： | 0K |
| 描述： | IC CONV DC-DC TFT-LCD 32LQFP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 2.5 V ~ 6 V |
| 输出数： | 8 |
| 输出电压： | 2.5 V ~ 18 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-LQFP |
| 供应商设备封装： | 32-LQFP（7x7） |
| 包装： | 带卷 (TR) |
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TFT-LCD DC-DC Converter with
Operational Amplifiers
CLOCK
RESET DOMINANT
S
LX
V MAIN
FROM CHARGE-PUMP
OUTPUT
ILIM
COMPARATOR
R
Q
PGND
DRVP
MAX8795A
npn CASCODE
TRANSISTOR
pnp PASS
TRANSISTOR
V GON
SLOPE COMP
SOFT-
START
V LIMIT
FBP
OSCILLATOR
PWM
COMPARATOR
Σ
CURRENT
SENSE
Figure 4. Using Cascoded npn for Charge-Pump Output
Voltages > 36V
FAULT
COMPARATOR
LX
TO FAULT LATCH
0.1 μ F
1.14V
ERROR AMP
FB
0.1 μ F
V MAIN
14V
68pF
1.233V
COMP
6.8k ?
Figure 3. Step-Up Regulator Functional Diagram
DRVP
Q1
V GON
35V
voltage, the controller resets the flip-flop and turns off
the MOSFET. Since the inductor current is continuous,
a transverse potential develops across the inductor that
turns on the diode (D1). The voltage across the induc-
MAX8795A
FBP
47pF
0.47 μ F
274k ?
1%
0.22 μ F
tor then becomes the difference between the output
voltage and the input voltage. This discharge condition
forces the current through the inductor to ramp back
down, transferring the energy stored in the magnetic
150pF
10.2k ?
1%
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 25V. Other output
voltages and currents are possible with the proper pass
transistor and output capacitor. See the Pass-Transistor
Selection and Stability Requirements sections.
Figure 5. The linear regulator controls the intermediate charge-
pump stage.
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 DRVP is 36V. If the charge-pump out-
put voltage can exceed 36V, 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).
______________________________________________________________________________________
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| MAX8796GTJ+ | 功能描述:电压模式 PWM 控制器 IMVP6 Single-Phase PWM Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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| MAX8796GTJ+G1D | 功能描述:电压模式 PWM 控制器 1-Phase Quick-PWM Intel IMVP-6/GMCH RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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