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参数资料
| 型号： | MAX1997ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/31页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY TFT LCD 32TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 应用： | 控制器，TFT LCD |
| 输入电压： | 2.7 V ~ 5.5 V |
| 输出数： | 5 |
| 输出电压： | 2.7 V ~ 13 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 管件 |
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Quintuple/Triple-Output TFT LCD Power Supplies
with Fault Protection and VCOM Buffer
FROM
OSCILLATOR
RESET DOMINANT
S
LX
PGND
R
Q
ILIM COMPARATOR
V LIMIT
CURRENT
SENSE
∑
SLOPE_COMP
FB
REFOUT REFIN
SOFT-START
REF
TO FAULT
LOGIC
Figure 3. Main Step-Up Converter Functional Diagram
1.0V
CLK
D ≈ MAIN IN
In addition, all outputs are monitored for fault conditions
that last longer than the fault timer period. The device
goes into a latched shutdown state, if the junction tem-
perature of the device exceeds +160 ° C.
Main Step-Up Controller
The main step-up regulator switches at up to 1.5MHz,
and employs a current-mode control architecture to
maximize loop bandwidth and provide fast transient
response to pulsed loads found in source drivers for
TFT LCD panels. In addition, the high switching fre-
quency allows the use of low-profile inductors and
ceramic capacitors to minimize the thickness of LCD
panel designs. The integrated high-efficiency MOSFET
reduces the number of external components. The IC ’ s
built-in soft-start function controls the inrush current.
Depending on the input-to-output voltage ratio, the reg-
ulator controls the output voltage and the power deliv-
ered to the output by modulating the duty cycle (D) of
the power MOSFET in each switching cycle.
The duty cycle of the MOSFET is approximated by:
V -V
V MAIN
On the rising edge of the internal clock, the controller sets
a flip-flop, which turns on the N-channel MOSFET (Figure
3). The input voltage is applied across the inductor. The
inductor current ramps up linearly, storing energy in a
magnetic field. Once the sum of the feedback voltage,
slope-compensation, and current-feedback signals trip
the multi-input PWM comparator, the MOSFET turns off,
and the flip-flop resets. Since the inductor current is con-
tinuous, a transverse potential develops across the induc-
tor that turns on the diode (D1). The voltage across the
inductor becomes the difference between the output volt-
age and the input voltage. 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.
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1997ETJ+ | 功能描述:其他电源管理 Quint/Triple-Out TFT LCD Power Supply RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
| MAX1997ETJ+T | 功能描述:LCD 驱动器 Quint/Triple-Out TFT LCD Power Supply 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 |
| MAX1997ETJ-T | 功能描述:其他电源管理 RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
| MAX1997EVKIT | 制造商:Maxim Integrated Products 功能描述:QUINTUPLE/TRIPLE OUTPUT TFT LCD POWER SUPPLIE - Bulk |
| MAX19983A | 功能描述:上下转换器 RoHS:否 制造商:Texas Instruments 产品:Down Converters 射频:52 MHz to 78 MHz 中频:300 MHz LO频率: 功率增益: P1dB: 工作电源电压:1.8 V, 3.3 V 工作电源电流:120 mA 最大功率耗散:1 W 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PQFP-128 |
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