- 您现在的位置：买卖IC网 > PDF目录1836 > MAX1513ETP+T (Maxim Integrated Products)IC CNTRLR TFT-LCD PS 20-TQFN PDF资料下载
参数资料
| 型号： | MAX1513ETP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/28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) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页当前第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
TFT-LCD Power-Supply Controllers
taken from an appropriate curve in the Typical
Operating Characteristics , and an estimate of LIR
The ripple current and the peak current are:
? V IN ? ?
? ? η
TYP ?
L = ?
? ? ?
? ? I
LIR ?
? V MAIN ? ? MAIN ( EFF ) × f OSC ?
4 . 5 V × ( 15 V - 4 . 5 V )
I RIPPLE =
I PEAK = 2 . 1 A + ≈ 2 . 6 A
based on the above paragraphs:
2
V MAIN - V IN
?
2 . 2 μ H × 15 V × 1 . 5 MHz
1 . 0 A
2
≈ 1 . 0 A
Choose an available inductor value from an appropriate
inductor family. Calculate the maximum DC input cur-
rent at the minimum input voltage (V IN(MIN) ) using the
following equation:
The inductor DCR should be low enough for reasonable
efficiency. As a rule of thumb, do not allow the voltage
drop across the inductor DCR to exceed a few percent
of the input voltage at I PEAK .
I IN ( DC , MAX ) =
I MAIN(EFF) × V MAIN
V IN ( MIN ) × η MIN
Many notebook panel designs have height constraints
on the components. If a thin inductor with the required
current rating is not available, use two thin inductors in
The expected efficiency at that operating point ( η MIN )
can be taken from an appropriate curve in the Typical
Operating Characteristics.
Calculate the ripple current at that operating point and
the peak current required for the inductor:
series or parallel.
Current-Sense Network Selection
After selecting the inductor, use the following steps to
design the current-sense network for lossless current
sensing.
V IN ( MIN ) × ( V MAIN - V IN ( MIN )
L × V MAIN × f OSC
I PEAK = I IN ( DC , MAX ) + RIPPLE
τ =
I RIPPLE =
I
2
)
1) Calculate the RC time constant of the sense network
using the typical inductance and typical DCR:
L
R L ( TYP )
The inductor ’s saturation current rating and the
MAX1513/MAX1514s’ current limit (I LIM ) should exceed
2) Determine the component values of the sense net-
work. Select C S , and then calculate R S using:
I PEAK , and the inductor ’s DC current rating should
exceed I IN(DC, MAX) .
Considering the typical operating circuit, the maximum
R S =
τ
C S
? 5 V ? ?
? ? 0 . 85 ?
15 V - 5 V
L = ? ? ? ? ? ? ≈ 2 . 2 μ H
load current (I MAIN(MAX) ) is 400mA for I MAIN directly
and 30mA for REG G to provide V GAMMA . The one-
stage negative charge pump provides 30mA to REG N
for V GOFF , and the one-stage positive charge pump
provides 20mA to REG P for V GON . Altogether, the
effective maximum output current (I MAIN(EFF) ) is 500mA
with a 15V output and a typical 5V input voltage. The
switching frequency is set to 1.5MHz. Choosing an
LIR of 0.6 and estimating efficiency of 85% at this
operating point:
2
? 15 V ? ? 0 . 5 A × 1 . 5 MHz ? ? 0 . 6 ?
Using the circuit’s minimum input voltage (4.5V) and
estimating efficiency of 80% at that operating point:
3) Calculate the worst-case high sense voltage over
temperature using the maximum DCR value (R L(MAX) )
found in the inductor technical specifications:
V SENSE = I PEAK × R L ( MAX ) × ( 1 + TC × ? T )
where I PEAK is the peak inductor current calculated in
the Inductor Selection section, TC is the temperature
coefficient of copper (0.5%/°C) and ? T is the difference
between the specified temperature for R L(MAX) and the
maximum expected inductor temperature.
4) Compare the calculated sense voltage with the mini-
mum value of the current-limit threshold in the Electrical
Characteristics (100mV). If the sense voltage is between
80mV and 100mV, use the current-sense configuration
I IN ( DC , MAX ) =
0.5A × 15V
4 . 5 V × 0 . 8
≈ 2 . 1 A
in Figure 8 with the calculated C S and R S above.
18
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1515ETG+ | IC REG DDR LV 24-TQFN |
| MAX1518BETJ+T | IC DC-DC CONV TFT-LCD 32-TQFN |
| MAX1524EUT-T | IC REG CTRLR BST FLYBK SOT23-6 |
| MAX15301ETJ+ | IC REG CTRLR BUCK 32TQFN |
| MAX1531ETJ+T | IC PS CTRLR MULTI-OUTPUT 32TQFN |
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 |
发布紧急采购，3分钟左右您将得到回复。