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參數(shù)資料
| 型號： | ZXCP330 |
| 廠商： | Zetex Semiconductor |
| 元件分類： | DC/DC變換器 |
| 英文描述： | SWITCHED CAPACITOR DC-DC CONVERTER |
| 中文描述： | 開關(guān)電容DC - DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 341K |
| 代理商： | ZXCP330 |
Capacitor selection
An absolute minimum value of 220nF for the flying
capacitor is needed to obtain maximum output current
and 330nF is probably safer with tolerance in mind.
However much lower capacitors can be used if the
deviceisbeingusedatlightloads. Anoutputcapacitor
of 10 F is recommended and this should be as low an
ESR as possible as the output consists of large current
spikes, so ceramics are preferred. Because the flying
capacitor charges from the input via a switch, inrush
current is also large and a low ESR capacitor should be
used for input decoupling.
The device senses the output voltage in order to
regulate at 3.3V and any inductance in series with
either end of the output capacitor will cause ringing
which will not be damped as the output capacitor has
low ESR. This is very undesirable from a regulation or
ripple aspect, therefore short connections must be
used between device pins and all capacitors (see
Layout Considerations later) to keep the waveforms as
clean as possible.
The dielectric of the ceramic capacitor is an important
consideration for the ZXCP330 operation over
temperature. Zetex recommends minimum dielectric
specificationofX7RfortheflyingcapacitorandX5Rfor
theinputandoutputcapacitors. Capacitorsusedwitha
lower specification dielectric can cause excessive
noise and output voltage ripple and can also
compromise output current over temperature.
exampleaceramiccapacitorwithanX7Rdielectric will
lose 20% of its capacitance over a -40 C to 85 C
temperature range, whereas a capacitor with a Y5V
dielectric loses 80% of its capacitance at -40 C and 75%
at 85 C.
For
Layout considerations
Careful layout of the ZXCP330 application circuit is
essential for correct operation because of its high
switching frequency and transient currents. For
optimum converter performance use a ground plane
and keep PCB tracks to all capacitors short to minimise
outputvoltagerippleandmaintainregulationunderall
conditions.
The recommended layout configuration is shown
below:
Actual size (8mmx5.3mm)
Thermal management
At high input voltages and load currents the ZXCP330
power dissipation is high. As mentioned previously,
the ZXCP330 will shutdown when the junction
temperatureofthedevicereaches150 C.Toreducethe
junction temperature of the device a good thermal
connection to the PCB is necessary. This can be
achieved by connecting the GND pin of the ZXCP330 to
a solid ground plane running on the second layer of a 2
layer PCB, adding extra heatsinking.
ZXCP330
PROVISIONAL ISSUE A - DECEMBER 2001
6
Image enlarged to show detail.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZXCP330E6 | 制造商:ZETEX 制造商全稱:ZETEX 功能描述:SWITCHED CAPACITOR DC-DC CONVERTER |
| ZXCP330E6TA | 功能描述:IC REG SWITCHED CAP DBL SOT23 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:兩者兼有 輸出數(shù):1 輸出電壓:5V，1 V ~ 10 V 輸入電壓:3.5 V ~ 28 V PWM 型:電流模式 頻率 - 開關(guān):220kHz ~ 1MHz 電流 - 輸出:600mA 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-SSOP（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:16-QSOP |
| ZXCT1008 | 制造商:DIODES 制造商全稱:Diodes Incorporated 功能描述:AUTOMOTIVE HIGH-SIDE CURRENT MONITOR |
| ZXCT1008_07 | 制造商:ZETEX 制造商全稱:ZETEX 功能描述:AUTOMOTIVE HIGH-SIDE CURRENT MONITOR |
| ZXCT1008FTA | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 Automotive Tem Range RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
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