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参数资料
| 型号： | TC115501ECT |
| 元件分类： | 稳压器 |
| 英文描述： | 0.4 A SWITCHING REGULATOR, 115 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | SOT-89, 5 PIN |
| 文件页数： | 10/14页 |
| 文件大小： | 468K |
| 代理商： | TC115501ECT |
2002 Microchip Technology Inc.
DS21361B-page 5
TC115
4.0
APPLICATIONS
4.1
Input Bypass Capacitors
Using an input bypass capacitor reduces peak current
transients drawn from the input supply and reduces the
switching noise generated by the regulator. The source
impedance of the input supply determines the size of
the capacitor that should be used.
FIGURE 4-1:
TC115 TYPICAL
APPLICATION
4.2
Inductor Selection
Selecting the proper inductor value is a trade-off
between physical size and power conversion require-
ments. Lower value inductors cost less, but result in
higher ripple current and core losses. They are also
more prone to saturate since the coil current ramps to
a higher value. Larger inductor values reduce both
ripple current and core losses, but are larger in physical
size and tend to increase the start-up time slightly.
Practical inductor values, therefore, range from 50
H
to 300
H. Inductors with a ferrite core (or equivalent)
are recommended. For highest efficiency, use an
inductor with a series resistance less than 20 m
).
The inductor value directly affects the output ripple
voltage. Equation 4-3 is derived as shown below, and
can be used to calculate an inductor value, given the
required output ripple voltage (VRIPPLE) and output
capacitor series resistance:
EQUATION 4-1:
where ESR is the equivalent series resistance of the
output filter capacitor, and VRIPPLE is in volts.
Expressing di in terms of switch ON resistance and
time:
EQUATION 4-2:
Solving for L:
EQUATION 4-3:
Care must be taken to ensure the inductor can handle
peak switching currents, which can be several times
load currents. Exceeding rated peak current will result
in core saturation and loss of inductance. The inductor
should be selected to withstand currents greater than
IPK (Equation 4-10) without saturating.
Calculating the peak inductor current is straightforward.
Inductor current consists of an AC (sawtooth) current
centered on an average DC current (i.e., input current).
Equation 4-6 calculates the average DC current. Note
that minimum input voltage and maximum load current
values should be used:
EQUATION 4-4:
C1
L1
5
4
TC115
1
3
2
SHDN
PS
NC
C2
D1
GND
LX
VOUT
VIN
OFF ON
(Tie to VIN or VOUT
if not used)
+
VRIPPLE ≈ ESR(di)
VRIPPLE ≈
ESR [(VIN –VSW)tON]
L
≈
ESR [(VIN –VSW)tON]
VRIPPLE
L
=
Output Power
Efficiency
Input Power
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC115501EMTTR | 功能描述:开关变换器、稳压器与控制器 PFM/PWM Step-Up RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| TC115A | 制造商:Thomas & Betts 功能描述:1 1/2" Compression Connector, Steel-Zinc Plated, Concrete tight 制造商:Thomas & Betts 功能描述:Fittings Connector 1.5inch Steel |
| TC115A-RT | 制造商:Thomas & Betts 功能描述:Fittings Connector 1.5inch Male Steel |
| TC115EV | 功能描述:电源管理IC开发工具 PFM/PWM Boost Conv EVAL BRD 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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