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| 型号： | MAX1513ETP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 21/28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
R ESR ( MAX ) ≤
V DIP ( C ) ≈ PULSE PULSE
R 1 = R 2 × ? MAIN - 1 ?
R ESR ( MAX ) ≤
C OUT ( MIN ) ≥
In the circuits of Figures 1 and 2, the maximum total
voltage ripple is 1% (peak-to-peak) of the 15V output,
which corresponds to 150mV peak-to-peak ripple. A
conservative way to calculate the maximum ESR and
minimum capacitance is to assume the ESR ripple and
the capacitive ripple each should not exceed 50% of
the total ripple budget.
V RIPPLE ( MAX )
2 × I PEAK
2 × I MAIN ? V MAIN - V IN
C OUT ( MIN ) ≥ × ?
V RIPPLE ( MAX ) ? V MAIN × f OSC
where V RIPPLE(MAX) is the total peak-to-peak output rip-
ple. Since the peak inductor current calculated in the
Inductor Selection section is 2.6A, the maximum ESR of
the output capacitor should be less than 29m ? . On the
other hand, only 3.1μF capacitance is needed to meet
the capacitive ripple requirement based on the calcula-
tion. A 10μF AQU-series POSCAP with maximum ESR
of 20m ? is selected for the typical operating circuits in
Figures 1 and 2, which meets both the voltage-ripple
and minimum capacitance requirements.
The typical load on the step-up regulator for source-
driver applications is a large pulsed load, with a peak
current of approximately 1A and a pulse width of
approximately 2μs. The shape of the pulse is close to
triangular, so it is equivalent to a square pulse with 1A
height and 1μs pulse width. The total voltage dip during
the pulsed load transient also has two components: the
ohmic dip due to the output capacitor’s ESR and the
capacitive dip caused by discharging the output
capacitance:
V DIP = V DIP ( ESR ) + V DIP ( C )
V DIP ( ESR ) = I PULSE × R ESR
I × t
C OUT
where I PULSE is the height of the pulse load and t PULSE
is the pulse width. Higher capacitance and lower ESR
result in less voltage dip. Again, assume the ESR dip
and the capacitive dip each should not exceed 50% of
the total maximum allowed output-voltage dip caused
by a load pulse (V DIP(MAX) ).
V DIP ( MAX )
2 × I PULSE
2 × I PULSE × t PULSE
V DIP ( MAX )
For the typical load pulse described above, assuming the
voltage dip must be limited to 200mV, the minimum out-
put capacitor is 10μF, and the maximum ESR is 100m ? .
The voltage rating and temperature characteristics of
the output capacitor must also be considered.
Input-Capacitor Selection
The input capacitor (C IN ) reduces the current peaks
drawn from the input supply and reduces noise injec-
tion into the device. A 22μF ceramic capacitor is used
in the typical operating circuit (Figure 1) because of the
high source impedance seen in typical lab setups.
Actual applications usually have much lower source
impedance since the step-up regulator often runs
directly from the output of another regulated supply.
Typically, C IN can be reduced below the values used in
the typical operating circuit. Ensure a low noise supply
at IN by using adequate C IN . Alternately, greater volt-
age variation can be tolerated on C IN if IN is decoupled
from C IN using an RC lowpass filter (see R11 and C10
in Figure 1).
Rectifier Diode
The MAX1513/MAX1514s ’ high switching frequency
demands a high-speed rectifier. Schottky diodes are
recommended for most applications because of their
fast recovery time and low forward voltage. In general,
use a Schottky diode with a current rating exceeding
the peak inductor current calculated in the Inductor
Selection section.
Output-Voltage Selection
The output voltage of the main step-up regulator is
adjustable by connecting a resistive voltage-divider
from the output (V MAIN ) to the analog ground plane
with the center tap connected to FB (see Figure 1).
Select R2 in the 10k ? to 50k ? range. Calculate R1 with
the following equations:
? V ?
? V FB ?
where V FB , the step-up regulator’s feedback set point,
is 1.25V. Connect the divider close to the IC.
Output-Capacitor Stability Requirement
The step-up regulator controller of the MAX1513/
MAX1514 uses a peak current-mode control method.
The loop stability of a current-mode step-up regulator
can be analyzed using a small-signal model. In contin-
uous-conduction mode, the loop-gain transfer function
consists of a DC loop gain, a dominant pole, a right-
half-plane (RHP) zero and an ESR zero.
______________________________________________________________________________________
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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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