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參數(shù)資料
| 型號： | DCP010505B |
| 英文描述： | Miniature, 1W Isolated UNREGULATED DC/DC CONVERTERS |
| 中文描述： | 微型1W隔離未穩(wěn)壓DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 9/20頁 |
| 文件大小： | 453K |
| 代理商： | DCP010505B |
DCP01B SERIES
SBVS012B
DECEMBER 2000
REVISED OCTOBER 2004
www.ti.com
9
FUNCTIONAL DESCRIPTION
OVERVIEW
The DCP01B offers up to 1W of unregulated output power
with a typical efficiency of up to 85%. This is achieved
through highly integrated packaging technology and the
implementation of a custom power stage and control IC.
The circuit design uses an advanced BiCMOS/DMOS
process. For additional information, refer to the application
notes located in the DCP01B product folder at www.ti.com.
POWER STAGE
This uses a push-pull, center-tapped topology switching at
400kHz (divide-by-2 from 800kHz oscillator).
OSCILLATOR AND WATCHDOG
The onboard 800kHz oscillator generates the switching
frequency via a divide-by-2 circuit. The oscillator can be
synchronized to other DCP01B circuits or an external
source, and is used to minimize system noise.
A watchdog circuit checks the operation of the oscillator
circuit. The oscillator can be stopped by pulling the SYNC
pin low. The output pins will be tri-stated. This will occur in
2
μ
s.
THERMAL SHUTDOWN
The DCP01B is protected by a thermal shutdown circuit.
If the on-chip temperature exceeds 150
°
C, the device will
shut down. Once the temperature falls below 150
°
C,
normal operation will resume. If the thermal condition
continues, operation will randomly cycle on and off. This
will continue until the temperature is reduced.
SYNCHRONIZATION
In the event that more than one DC/DC converter is
needed onboard, beat frequencies and other electrical
interference can be generated. This is due to the small
variations in switching frequencies between the DC/DC
converters.
The DCP01B overcomes this by allowing devices to be
synchronized to one another. Up to eight devices can be
synchronized by connecting the SYNC
IN
pins together,
taking care to minimize the stray capacitance. Stray
capacitance (> 3pF) will have the effect of reducing the
switching frequency, or even stopping the oscillator circuit.
If synchronized devices are used, it should be noted that
at startup, all devices will draw maximum current
simultaneously. This can cause the input voltage to dip. If
it dips below the minimum input voltage (4.5V), the devices
may not start up. A 2.2
μ
F capacitor should be connected
close to the input pins.
If more than eight devices are to be synchronized, it is
recommended that the SYNC
IN
pins are driven by an
external device. Details are contained in Application
Report SBAA035,
External Synchronization of the
DCP01/02 Series of DC/DC Converters
, available for
download at www.ti.com.
CONSTRUCTION
The DCP01B basic construction is the same as standard
ICs. There is no substrate within the molded package. The
DCP01B is constructed using an IC, rectifier diodes, and
a wound magnetic toroid on a leadframe. Since there is no
solder within the package, the DCP01B does not require
any special PCB assembly processing. This results in an
isolated DC/DC converter with inherently high reliability.
ADDITIONAL FUNCTIONS
DISABLE/ENABLE
The DCP01B can be disabled or enabled by driving the
SYNC pin using an open drain CMOS gate. If the SYNC
IN
pin is pulled low, the DCP01B will be disabled. The disable
time depends upon the external loading; the internal
disable function is implemented in 2
μ
s. Removal of the
pull-down will cause the DCP01B to be enabled.
Capacitive loading on the SYNC
IN
pin should be
minimized in order to prevent a reduction in the oscillator
frequency.
DECOUPLING
Ripple Reduction
A high switching frequency of 400kHz allows simple
filtering. To reduce ripple, it is recommended that at least
a 1
μ
F capacitor is used on V
OUT
. Dual outputs should have
both the positive and negative buses decoupled to V
OUT
ground (pin 5). The required 2.2
μ
F low equivalent series
resistance (ESR) ceramic capacitor on the input of the 5V
to 15V versions, and the
≥
0.47
μ
F low-ESR ceramic
capacitor on the 24V versions help reduce ripple and
noise. See Application Bulletin SBVA012,
DC-to-DC
Converter Noise Reduction
, available for download at
www.ti.com.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DCP010505BP | 功能描述:DC/DC轉(zhuǎn)換器 Mini 1W Iso Unreg DC/DC Converter RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| DCP010505BP | 制造商:Texas Instruments 功能描述:Power Supply Function:Unregulated DC-DC 制造商:UNBRANDED 功能描述:IC DC/DC CONVERTER 1W 5V 10505 |
| DCP010505BP-U | 功能描述:DC/DC轉(zhuǎn)換器 Mini 1W Iso Unreg DC/DC Converter RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| DCP010505BP-U | 制造商:Texas Instruments 功能描述:IC's |
| DCP010505BP-U | 制造商:Texas Instruments 功能描述:IC DC/DC CONVERTER 1W 5V/5V 10505 |
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