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参数资料
| 型号： | TS2576CM5-3.3 |
| 厂商： | Taiwan Semiconductor Co., Ltd. |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 3A Step Down Switching Voltage Regulator |
| 中文描述： | 第3A降压开关稳压器 |
| 文件页数： | 5/7页 |
| 文件大小： | 141K |
| 代理商： | TS2576CM5-3.3 |
TS2576
5-7
2003/12 rev. A
Application Information
It is required that VIN must be bypassed with at least a
100μF electrolytic capacitor for stability. Also, it is
strongly recommended the capacitor’s leads must be
dept short, and located near the regulator as possible.
For low operating temperature range, for example, below
-25
o
C, the input capacitor value may need to be larger.
This is due to the reason that the capacitance value of
electrolytic capacitors decreases and the ESR increases
with lower temperatures and ago. Paralleling a ceramic
or solid tantalum capacitor will increase the regulator
stability at cold temperatures.
Output Capacitor
An output capacitor is also required to filter the output
voltage and is needed for loop stability. The capacitor
should be located near the TS2576 using short PC
board
traces.
Low
ESR
recommended for low output ripple voltage and good
stability. Generally, low value or low voltage (less than
12V) electrolytic capacitors usually have higher ESR
numbers, For example, the lower capacitor values
(220μF - 1000μF) will yield typically 50mV to 150mV of
output ripple voltage, while larger-value capacitors will
reduce the ripple to approximately 20mV to 50mV.
The amount of output ripple voltage is primarily a
function of the ESR (Equivalent Series Resistance) of
the output capacitor and the amplitude of the inductor
ripple current (I
IND
)
Output Ripple Voltage = (I
IND
) x (ESR of C
OUT
)
Some
capacitors
called
“low-inductance”, or “low-ESR” are recommended to use
to further reduce the output ripple voltage to 10mV or
20mV. However, very low ESR capacitors, such as
tantalum capacitors, should be carefully evaluated.
Catch Diode
types
capacitors
are
“high-frequency”,
This diode is required to return path for the inductor
current when the switch is off. It should be located close
to the TS2576 using short leads and short printed circuit
traces as possible.
To satisfy the need to fast switching speed and low
forward voltage drop, Schottky diodes are widely used to
provide the best efficiency, especially in low output
voltage switching regulators (less than 5V). Beside,
Fast-Recovery, high-efficiency, or ultra fast recovery
diodes are also suitable. But some types with an abrupt
turn-off characteristic may cause instability and EMI
problems. A fast recovery diode with soft recovery
characteristics is better choice.
Inductor Selection
The TS2576 can be used for either continuous or
discontinuous modes of operation. Each mode has
distinctively different operating characteristics, which can
affect the regulator performance and requirements.
With relatively heavy load currents, the circuit operates
in the continuous mode (inductor current always flowing).
But under light
Load conditions, the circuit will be force to the
discontinuous mode (inductor current falls to zero for a
period of time). For light loads (less than approximately
300mA) it may be desirable to operate the regulator in
the discontinuous mode, primarily because of the lower
inductor values required for the discontinuous mode.
Indictors are available in different styles such as pot
core, toroid, E-frame, bobbin core, et., as well as
different core materials such as ferrites and powdered
iron. The least expensive, the bobbin core type, consists
of wire wrapped on a ferrite rod core. This type of
construction makes for an inexpensive inductor, but
since the magnetic flux is not completely contained
within the core, it generates more electromagnetic
interference (EMI). This EMI can cause problems in
sensitive circuits, or can give incorrect scope readings
because of induced voltage in the scope probe. An
inductor should not be operated beyond its maximum
rated current because it may saturate. When an inductor
begins to saturate, the inductance decreases rapidly and
the inductor begins to look mainly resistive (the DC
resistance of the winding). This will cause the switch
current to rise very rapidly. Different inductor types have
different saturation characteristics, and this should be
well considered when selecting as inductor.
Feedback Connection
For fixed output voltage version, the FB (feedback) pin
must be connected to V
OUT
. For the adjustable version, it
is important to place the output voltage ratio resistors
near TS2576 as possible in order to minimize the noise
introduction.
Enable Input
It is required that the ENABLE must not be left open. For
normal operation, connect this pin to a ”LOW” voltage
(typically, below 1.6V). On the other hand, for standby
mode, connect this pin with a “HIGH” voltage. This pin
can be safely pulled up to +
VIN
without a resistor in series
with it.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TS2576CM533 RN | 制造商:SKMI/Taiwan 功能描述:3A / 52KHZ BUCK SWITCHING REGULATOR |
| TS2576CM5-5 | 制造商:TSC 制造商全称:Taiwan Semiconductor Company, Ltd 功能描述:3A Step Down Switching Voltage Regulator |
| TS2576CM5-5.0 | 制造商:TSC 制造商全称:Taiwan Semiconductor Company, Ltd 功能描述:3A Step Down Switching Voltage Regulator |
| TS2576CM550 | 功能描述:开关变换器、稳压器与控制器 5.0V 3.0A 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 |
| TS2576CM550 RN | 制造商:SKMI/Taiwan 功能描述:3A / 52KHZ BUCK SWITCHING REGULATOR |
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