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| 型号： | TC125501ECTRT |
| 元件分类： | 稳压器 |
| 英文描述： | 0.4 A SWITCHING REGULATOR, 115 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | EIAJ, SC-74A, SOT-23A, 5 PIN |
| 文件页数： | 5/10页 |
| 文件大小： | 84K |
| 代理商： | TC125501ECTRT |
4
PFM Step-Up DC/DC Regulators
TC125
TC126
TC125/6-1 8/3/99
2001 Microchip Technology Inc
DS21372A
APPLICATIONS
Low Power Shutdown Mode
The TC125 enters a low power shutdown mode when
SHDN is brought low. While in shutdown, the oscillator is
disabled and the internal switch is shut off. Normal regulator
operation resumes when SHDN is brought high. Because
the TC125 uses an external diode, a leakage path between
the input voltage and the output node (through the inductor
and diode) exists while the regulator is in shutdown. Care
must be taken in system design to assure the input supply
is isolated from the load during shutdown.
Behavior When VIN is Greater Than the Fac-
tory-Programmed OUT Setting
The TC125 and TC126 are designed to operate as step-
up regulators only. As such, VIN is assumed to always be
less than the factory-programmed output voltage setting
(VR). Operating the TC125/6 with VIN > VR causes regulating
action to be suspended (and corresponding supply current
reduction) until VIN is again less than VR. While regulating
action is suspended, VIN is connected to the output voltage
node through the series combination of the inductor and
Schottky diode.
Again, care must be taken to add the
appropriate isolation (MOSFET series switch or post LDO
with shutdown) during system design if this VIN/VOUT leak-
age path is problematic.
Table 1. Suggested Components and Manufacturers
Type
Inductors
Capacitors
Diodes
Surface Mount
Sumida
Matsuo
Nihon
CD54 Series
267 Series
EC10 Series
CDR125 Series
Murata
GRM200 Series
Coiltronics
Sprague
Matshushita
CTX Series
595D Series
MA735 Series
Murata
Nichicon
LQN6C Series
F93 Series
Through Hole
Sumida
Sanyo
Motorola
RCH855 Series
OS-CON Series
1N5817-1N5822
RCH110 Series
Renco
Nichicon
RL1284-12
PL Series
Input Bypass Capacitors
Adding 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.
Inductor Selection
Selecting the proper inductor value is a trade-off be-
tween physical size and power conversion requirements.
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. The recommended inductor value
for use with the TC125/6 is 100
H. Inductors with a ferrite
core (or equivalent) are recommended. For highest effi-
ciency, use an inductor with a series resistance less than 20
m
.
Internal Transistor Switch Current Limiting
The peak switch current is equal to the input voltage
divided by the RDSON of the internal switch. The internal
transistor has absolute maximum current rating of 400 mA
with a design limit of 350 mA. A built-in oscillator frequency
doubling circuit guards against high switching currents.
Should the voltage on the LX pin rise above 1.1V, max while
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC125501ECTTR | 功能描述:开关变换器、稳压器与控制器 PFM Step-up DC/DC 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 |
| TC125A | 制造商:Thomas & Betts 功能描述:Fittings Connector 1.5inch Steel |
| TC125SC-1 | 制造商:Thomas & Betts 功能描述:1-1/2 EMT SET SCREW CONN,EA |
| TC125-TB | 制造商:Thomas & Betts 功能描述:CABLE TIES |
| TC126 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:PFM Step-Up DC/DC Regulators |
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