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参数资料
| 型号： | MAX1513ETP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 26/28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
? I BIAS FE ? ?
× h
A V _ LR ≈ ? V T ? × ? 1 + ? I ? ? × V REF
where C IN =
, R IN =
g m h FE
2 π f T
? 4 ? ?
? ?
? ? LOAD _ LR ? ?
where V T is 26mV at room temperature and I BIAS is the
current through the base-to-emitter resistor (R BE ). Each
of the four linear-regulator controllers is designed for a
different maximum output current, so they have differ-
ent output drive currents and different bias currents
,
g m
g m is the transconductance of the pass transistor,
and f T is the transition frequency. Both parameters
can be found in the transistor’s data sheet. Because
R BE is much greater than R IN , the above equation
can be simplified:
(I BIAS ). Each controller’s bias current can be found in
the Electrical Characteristics table. The current listed in
the conditions column for the FB_ regulation voltage
f POLE _ IN =
1
2 π × C IN × R IN
specification is the individual controller’s bias current.
The base-to-emitter resistor for each controller should
The equation can be further simplified:
R BE =
f POLE _ IN =
be chosen to set the correct I BIAS :
V BE
I BIAS
The output capacitor and the load resistance create the
dominant pole in the system. However, the internal
4)
f T
h FE
Next, calculate the pole set by the linear regulator’s
feedback resistance and the capacitance between
FB_ and GND (including stray capacitance):
2 π × C FB ( UPPER LOWER
amplifier delay, the pass transistor’s input capacitance,
and the stray capacitance at the feedback node create
additional poles in the system. The output capacitor’s
f POLE _ FB =
× R || R
1
)
ESR generates a zero. For proper operation, use the
following equations to verify the linear regulator is prop-
erly compensated:
1) First, determine the dominant pole set by the linear
regulator’s output capacitor and the load resistor:
5)
where C FB is the capacitance between FB_ and
ground, R UPPER is the upper resistor of the linear
regulator’s feedback divider, and R LOWER is the
lower resistor of the divider.
Next, calculate the zero caused by the output
capacitor’s ESR:
f POLE _ LR =
I LOAD ( MAX )_ LR
2 π × C OUT _ LR × V OUT _ LR
f POLE _ ESR =
1
2 π × C OUT _ LR × R ESR
The unity-gain crossover of the linear regulator is:
where R ESR is the equivalent series resistance
f CROSSOVER = A V _ LR × f POLE _ LR
6)
of C OUT_LR .
To ensure stability, choose C OUT_LR large enough
2)
3)
The pole created by the internal amplifier delay is
about 1MHz:
f POLE _ AMP ≈ 1 MHz
Next, calculate the pole set by the transistor’s input
capacitance C IN , the transistor’s input resistance
R IN , and the base-to-emitter pullup resistor:
so the crossover occurs well before the poles and
zero calculated in steps 2 to 5. The poles in steps 3
and 4 generally occur at several megahertz and
using ceramic capacitors ensures the ESR zero
occurs at several megahertz as well. Placing the
crossover below 500kHz is sufficient to avoid the
amplifier-delay pole and generally works well,
unless unusual component choices or extra capac-
itances move the other poles or zero below 1MHz.
f POLE _ IN =
1
2 π × C IN × ( R BE || R IN
)
26
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相关代理商/技术参数 |
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| 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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