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參數(shù)資料
| 型號(hào)： | TC115501ECT |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.4 A SWITCHING REGULATOR, 115 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | SOT-89, 5 PIN |
| 文件頁數(shù)： | 9/14頁 |
| 文件大小： | 468K |
| 代理商： | TC115501ECT |
TC115
DS21361B-page 4
2002 Microchip Technology Inc.
3.0
DETAILED DESCRIPTION
The TC115 is a combination PFM/PWM step-up
(boost) regulator. It is particularly useful in 1, 2 and 3
cell applications where the required output current is
140mA or less, and size/cost issues are a concern. The
device operates in PWM mode when the output load is
sufficient to demand a 10% (or greater) duty cycle.
While in PWM mode, the TC115 behaves as any other
PWM switching regulator, to a maximum duty cycle of
92%. At low output loads (i.e., output loads requiring
< 10% duty cycle to support); the TC115 automatically
switches
to
pulse
frequency
modulation
(PFM)
operating mode with a fixed duty cycle of 25%, max,
(17%, typical). While in PFM mode, the inductor is
modulated with individual fixed width pulses only as
needed to maintain output voltage. This action reduces
supply current, thereby improving power efficiency at
low output loads.
3.1
Input Power and Sensing
The TC115 is powered from the PS input, which must
be connected to the regulated output as shown in
Figure 4-1. PS also senses output voltage for closed-
loop regulation. Start-up current is furnished through
the inductor when input voltage is initially applied. This
action starts the oscillator, causing the voltage at the
PS input to rise, bootstrapping the regulator into full
operation.
3.2
Output Diode
For best results, use a Schottky diode such as the
MA735, 1N5817, EC10 or equivalent. Connect the
diode between the PS and LX pins as close to the IC as
possible. Do not use ordinary rectifier diodes since the
higher forward voltages reduce efficiency.
3.3
Low Power Shutdown Mode
The TC115 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. SHDN may be tied to the input supply if not used.
Note:
Because the TC115 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.
3.4
Behavior When VIN is Greater
Than the Factory-Programmed
VOUT Setting
The TC115 is designed to operate as a step-up
regulator only. As such, VIN is assumedtoalwaysbe
less than the factory-programmed VOUT setting (VR).
Operating the TC115 with VIN >VR causes regulating
action to be suspended (and corresponding supply
current reduction to 9
A, typical) until VIN is again less
than VR. While regulating action is suspended, VIN is
connected to VOUT through the series combination of
the inductor and Schottky diode. Care must be taken to
add the appropriate isolation (MOSFET output switch
or post LDO with shutdown) during system design if
this VIN/VOUT leakage path is problematic.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC115501EMTTR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 PFM/PWM Step-Up RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝: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:電源管理IC開發(fā)工具 PFM/PWM Boost Conv EVAL BRD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TC115-PB-B | 制造商:Carling Technologies 功能描述:T-SERIES ROCKER SWITCH - Bulk |
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