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參數(shù)資料
| 型號： | DCR021205P |
| 英文描述： | Miniature, 2W Isolated REGULATED DC/DC CONVERTERS |
| 中文描述： | 微型，2W的隔離穩(wěn)壓DC / DC變換器 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 174K |
| 代理商： | DCR021205P |
SBVS028A DECEMBER 2000 REVISED APRIL 2004
www.ti.com
8
GENERATION OF DUAL POLARITY
VOLTAGES FROM TWO
SELF-SYNCHRONIZED DCR02s
Two DCR02s can be configured to produce a dual polarity
supply (that is,
±
5V); the circuit must be connected as
shown in Figure 3.
It should be observed that both DCR02s are positive
voltage regulators; therefore the ERROR, ENABLE, and
V
REC
pins are relative to their respective devices, 0V, and
must not be connected together.
PCB LAYOUT
RIPPLE AND NOISE
Careful consideration should be given to the layout of the
PCB in order for the best results to be obtained.
The DCR02 is a switching power supply and as such can
place high peak current demands on the input supply. In
order to avoid the supply falling momentarily during the
fast switching pulses, ground and power planes should be
used to track the power to the input of DCR02; this will also
serve to reduce noise on the circuit. If this is not possible,
the supplies must be connected in a star formation, with
the tracks made as wide as possible.
If the SYNC pin is being used, the tracking between device
SYNC pins should be short, to avoid stray capacitance. If
the SYNC pin is not being used, it is advisable to place a
guard ring (connected to input ground) around this pin to
avoid any noise pickup.
The output should be taken from the device using ground
and power planes. This will ensure minimum losses.
A good quality, low ESR ceramic capacitor placed as close
as practical across the input will reduce reflected ripple
and ensure a smooth startup.
Additionally, a good quality, low ESR ceramic capacitor
placed as close as practical across the rectifier output
terminal and output ground will also give the best ripple
and noise performance.
THERMAL MANAGEMENT
Due to the high power density of this device, it is advisable
to provide a ground plane on the output. The output
regulator is mounted on a copper leadframe, and a ground
plane will serve as an efficient heatsink.
DCR
02
OUT
V
IN
C
OUT
0.1
μ
F
C
FILTER
1
μ
V
POS
O/P
V
NEG
O/P
0V
ENABLE
V
REC
ERROR
V
S
U1
0V
SYNC
DCR
02
V
OUT
V
IN
C
OUT
0.1
μ
F
C
FILTER
1
μ
0V
ENABLE
V
REC
ERROR
V
S
U2
0V
SYNC
0V
C
IN(1)
C
IN(1)
NOTE: (1) Required 2.2
μ
F low ESR ceramic capacitor.
Figure 3. Dual Polarity Voltage Generation from Two Self-Synchronized DCR02s
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|---|---|
| DCR021205P-U | 功能描述:DC/DC轉(zhuǎn)換器 Mini 2W Iso Regs 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(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: |
| DCR021205P-U/700 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| DCR022405 | 制造商:BB 制造商全稱:BB 功能描述:Miniature, 2W Isolated REGULATED DC/DC CONVERTERS |
| DCR022405P | 功能描述:DC/DC轉(zhuǎn)換器 Mini 2W Iso Regs 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(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: |
| DCR022405P-U | 功能描述:DC/DC轉(zhuǎn)換器 Mini 2W Iso Regs 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(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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