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参数资料
| 型号： | MAX1513ETP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/28页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR TFT-LCD PS 20-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 控制器，TFT LCD |
| 输入电压： | 2.7 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 2.7 V ~ 50 V |
| 工作温度： | -40°C ~ 85°C |
| 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（4x4） |
| 包装： | 带卷 (TR) |
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TFT-LCD Power-Supply Controllers
input PWM comparator, the flip-flop is reset and the
MOSFET turns off. Since the inductor current is continu-
ous, a transverse potential develops across the inductor
that turns on the diode (D1). The voltage across the
inductor then becomes the difference between the out-
put voltage and the input voltage. This discharge condi-
tion forces the current through the inductor to ramp
down, transferring the energy stored in the magnetic
field to the output capacitor and the load. The N-channel
MOSFET is kept off for the rest of the clock cycle.
Current Limiting and
Current-Sense Amplifier (CS+, CS-)
The internal current-limit circuit resets the PWM flip-flop
and turns off the external power MOSFET whenever the
input to the current-sense amplifier. To prevent the
sense amplifier from seeing large common-mode
switching voltages, the sense capacitor should always
be connected to the nonswitching end of the inductor
(i.e., the input of the step-up regulator).
Lossless current sense can be easily understood using
complex frequency domain analysis. The voltage
across the inductor is given by:
V L = I L ( sL + R L )
where L is the inductance, R L is the DCR of the induc-
tor, and I L is the inductor current. The voltage across
the sense capacitor is given by:
voltage difference between CS+ and CS- exceeds
125mV (typ). The tolerance on this current limit is
± 20%. Use the minimum value of the current limit to
select components of the current-sense network.
V S =
1
1 + sR S C S
V L
Lossless Current Sense
The lossless current-sense method uses the DC resis-
tance (DCR) of the inductor as the sense element.
where R S is the series resistor in the sense network and
C S is the sense capacitor. The above equation can be
rewritten as:
Figure 5 shows a simplified step-up regulator using the
basic lossless current-sensing method. An RC network
is connected in parallel with the step-up inductor (L).
V S =
sL + R L
1 + sR S C S
I L =
1 + sL / R L
1 + sR S C S
R L I L
The voltage across the sense capacitor (C S ) is the
If
L
R L
= R S C S , then the equation becomes :
V S = R L I L
RESET DOMINANT
Therefore, the sense capacitor voltage is directly pro-
CLOCK
ILIM
COMPARATOR
S
R
Q
125mV
GATE
portional to the inductor current if the time constant of
the RC sense network matches the time constant of the
inductor/DCR. The sense method is equivalent to using
a current-sense resistor that has the same value as the
inductor DCR.
INDUCTOR
R L
L
LEVEL
SHIFT
CS+
CS-
V IN
C S
R S
V MAIN
Σ
SLOPE_COMP
FB
C S+
+
V S
-
C S-
GATE
TO
FAULT LOGIC
SOFT-START
BLOCK
1.0V
REF
MAX1513
MAX1514
GND
FB
Figure 4. Step-Up Regulator-Controller Functional Diagram
Figure 5. Step-Up Regulator Using Lossless Current Sensing
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1513EVKIT | 功能描述:电源管理IC开发工具 MAX1513/14 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX1514ETP | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1514ETP+T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1514ETP-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1515ETG | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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