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参数资料
| 型号： | MAX1513ETP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/28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
Soft-Start
Each positive regulator (step-up regulator, REG P, REG
L, and REG G) includes a 7-bit soft-start DAC whose
input is the reference, and whose output is stepped in
128 steps from zero up to the reference voltage. The
soft-start DAC of the negative regulator (REG N) steps
from the reference down to 250mV in about 100 steps.
The outputs of the soft-start DACs determine the set
points of each regulator. The soft-start duration is 2.7ms
(typ) for each positive regulator and about 2.2ms for the
negative regulator. The soft-start is independent of the
selected operating frequency.
Fault Protection
During steady-state operation, if the step-up regulator
output or any of the linear-regulator outputs does not
exceed its respective fault detection threshold, the
MAX1513/MAX1514 activate an internal fault timer. If
any condition or the combination of conditions indi-
cates a continuous fault for the fault-timer duration
(43.6ms typ), the MAX1513/MAX1514 set the fault
latch, shutting down all the outputs except the refer-
ence. Once the fault condition is removed, toggle SDFR
(below 0.4V) or cycle the input voltage (below 2.2V) to
clear the fault latch and reactivate the device. The fault-
detection circuit is disabled during the soft-start time of
each regulator.
Thermal-Overload Protection
The thermal-overload protection prevents excessive
power dissipation from overheating the MAX1513/
MAX1514. When the junction temperature exceeds
+160 ° C, a thermal sensor immediately activates the
fault-protection circuit, which shuts down all the outputs
except the reference, allowing the device to cool down.
Once the device cools down by approximately 15 ° C,
cycle the input voltage (below the UVLO falling thresh-
old) to clear the fault latch and reactivate the device.
The thermal-overload protection protects the controller
in the event of fault conditions. For continuous opera-
tion, do not exceed the absolute maximum junction
temperature rating of T J = +150 ° C.
Design Procedure
Main Step-Up Regulator
Inductor Selection
The minimum inductance value, peak current rating,
and DC series resistance (DCR) are factors to consider
when selecting the inductor. These factors influence the
converter’s efficiency, maximum output load capability,
transient-response time, and output voltage ripple. Size
and cost are also important factors to consider.
The maximum output current, input voltage, output volt-
age, and switching frequency determine the inductor
value. Very high inductance values minimize the cur-
rent ripple and therefore reduce the peak current,
which decreases core losses in the inductor and I 2 R
losses in the entire power path. However, large induc-
tor values also require more energy storage and more
turns of wire, which increases size and can increase
I 2 R losses in the inductor. Low inductance values
decrease the size but increase the current ripple and
peak current. Finding the best inductor involves choos-
ing the best compromise between circuit efficiency,
inductor size, and cost.
The equations used here include a constant, LIR, which
is the ratio of the inductor peak-to-peak ripple current
to the average DC inductor current at the full load cur-
rent. The best trade-off between inductor size and cir-
cuit efficiency for step-up regulators generally has an
LIR between 0.3 and 0.5. However, depending on the
AC characteristics of the inductor core material and the
ratio of inductor resistance to other power-path resis-
tances, the best LIR can shift up or down. If the induc-
tor resistance is relatively high, more ripple can be
accepted to reduce the number of turns required and
increase the wire diameter. If the inductor resistance is
relatively low, increasing inductance to lower the peak
current can decrease losses throughout the power
path. If extremely thin high-resistance inductors are
used, as is common for LCD panel applications, the
best LIR can increase to between 0.5 and 1.0.
Once an inductor is chosen, higher and lower values
for the inductor should be evaluated for efficiency
improvements in typical operating regions.
Determine the inductor value and peak current require-
ment as follows:
Since the current delivered by charge pumps connect-
ed to LX adds to the inductor current, calculate the
effective maximum output current, I MAIN(EFF) :
I MAIN ( EFF ) = I MAIN ( MAX ) + n NEG × I NEG
+ ( n POS + 1 ) × I POS
where I MAIN(MAX) is the maximum output current
including any gamma-regulator current, n NEG is the
number of negative charge-pump stages, n POS is the
number of positive charge-pump stages, I NEG is the
negative charge-pump output current, and I POS is the
positive charge-pump output current, assuming the
pump source for I POS is V MAIN .
Calculate the approximate inductor value using the typ-
ical input voltage (V IN ), the expected efficiency ( η TYP )
______________________________________________________________________________________
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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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