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參數(shù)資料
| 型號： | DCV010515P |
| 英文描述： | Miniature, 1W, 1500Vrms Isolated UNREGULATED DC/DC CONVERTERS |
| 中文描述： | 微型1W，1500Vrms隔離未穩(wěn)壓DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大小： | 122K |
| 代理商： | DCV010515P |
7
DCV01
FIGURE 1. Connecting the DCV01 in Series.
FUNCTIONAL DESCRIPTION
OVERVIEW
The DCV01 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 utilizes an advanced BiCMOS/DMOS pro-
cess. Separate primary and secondary transformer windings
give good isolation and low barrier capacitance.
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 DCV01 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
IN
pin LOW. The output pins will be tri-stated. This will occur
in 2
μ
s.
THERMAL SHUTDOWN
The DCV01 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.
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 DCV01 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, tak-
ing care to minimize the capacitance of tracking. 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
start up, all devices will draw maximum current simulta-
neously. This can cause the input voltage to dip and should
it dip 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 exter-
nal device. Details are contained in a separate applications
bulletin (AB-153).
CONSTRUCTION
The DCV01’s basic construction is the same as standard ICs.
There is no substrate within the molded package. The
DCV01 is constructed using an IC, rectifier diodes, and a
wound magnetic toroid on a leadframe. As there is no solder
within the package, the DCV01 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 DCV01 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 DCV01 will be disabled. The disable time
depends upon the external loading; the internal disable func-
tion is implemented in 2
μ
s. Removal of the pull down will
cause the DCV01 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
The 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 both be
decoupled to pin 5. A 2.2
μ
F low ESR capacitor on the input
of the 5V in versions, and a 0.47
μ
F low ESR cap on the 24V
DCV01 in versions is recommended.
DCV
01
V
OUT 1
V
SUPPLY
V
S
0V
DCV
01
V
OUT 2
V
OUT1
+ V
OUT 2
SYNC
IN
SYNC
IN
V
S
0V
0V
0V
COM
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| DCV010515P-U | 功能描述:DC/DC轉(zhuǎn)換器 Mini 1W 1500Vrms Isolate DC/DC Cnvrtr 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(biāo)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(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
| DCV010515P-U/700 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Mini 1W 1500Vrms Isolate DC/DC Cnvrtr RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| DCV011512D | 制造商:BB 制造商全稱:BB 功能描述:Miniature, 1W, 1500Vrms Isolated UNREGULATED DC/DC CONVERTERS |
| DCV011512DP | 功能描述:DC/DC轉(zhuǎn)換器 Mini 1W 1500Vrms Isolate DC/DC Cnvrtr 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(biāo)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(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
| DCV011512DP-U | 功能描述:DC/DC轉(zhuǎn)換器 Mini 1W 1500Vrms Isolate DC/DC Cnvrtr 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(biāo)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(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
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