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参数资料
| 型号： | MAX1513ETP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/28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
Select C S = 0.1μF, R S is:
V IN
L
R S3
V MAIN
R S =
220 μ s
0 . 1 μ F
= 2200 ?
C S+
C S
R S4
C S-
GATE
Assuming ? T is 40 ° C and TC is 0.5%, the worst-case
high sense voltage over temperature is:
V SENSE = 2 . 6 A × 14 m ? ( 1 + 0 . 005 × 40 ° C ) = 44 mV
Because V SENSE would be much less than 80mV, the
MAX1513
MAX1514
GND
circuit in Figure 10 can be used to improve the current-
limit accuracy. Calculate R S3 and R S4 :
FB
R S 3 =
15 V - 4 . 5 V
1 5V - 4 .5V - 0 .1V + 0 . 044 V
× 2600 ? = 2614 ?
Figure 10. Lossless Current Sensing with V SENSE < 80mV
R S 4 = 2614 ? - 2600 ? = 14 ?
The closest 1% standard values for R S3 and R S4 are
2.61k ? and 14.0 ? , respectively.
(
V SENSE = 2 . 6 A × 56 m ? 1 + 0 . 005 × 40 ° C
)
= 175 mV
Output-Capacitor Selection
The output capacitor and its equivalent series resistance
Because V SENSE would be greater than 100mV, the cir-
cuit in Figure 9 should be used and the scale factor is:
(ESR) affect the circuit’s stability, output voltage ripple,
and transient response. The Output-Capacitor Stability
Requirement section discusses the output capacitance
SF =
100mV
175 mV
= 0 . 571
requirement based on the loop stability. This section
deals with how to determine the output capacitance
according to the ripple voltage and load-transient
Calculate R S1 and R S2 :
requirements.
The total output voltage ripple has two components: the
R S 1 =
489 ?
0 . 571
= 856 ?
ohmic ripple due to the capacitor’s equivalent series
resistance (ESR), and the capacitive ripple caused by
the charging and discharging of the output capacitance:
R S 2 =
856 × 0 . 571
1 - 0 . 571
= 1139 ?
V RIPPLE = V RIPPLE ( ESR ) + V RIPPLE ( C )
V RIPPLE ( ESR ) ≈ I PEAK × R ESR
I MAIN ? V MAIN - V IN ?
? V MAIN × f OSC ?
The closest 1% standard values for R S1 and R S2 are
866 ? and 1.13k ? , respectively.
If the 2.2μH inductor used in the typical operating cir-
cuit (Figures 1 and 2) has a typical DCR of 10m ? and a
maximum DCR of 14m ? , the RC time constant of the
sense network is:
V RIPPLE ( C ) ≈ × ? ?
C OUT
where V MAIN is the output voltage of the step-up regu-
lator, I MAIN is the output current, C OUT is the output
capacitance, R ESR is the ESR of the output capacitor,
τ =
2.2 μ H
10 m ?
= 220 μ s
f OSC is the switching frequency, and I PEAK is the peak
inductor current (see the Inductor Selection section).
20
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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 |
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| 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 |
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