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參數(shù)資料
| 型號： | NCP1423DMR2 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 400 mA Sync−Rect PFM Step−Up DC−DC Converter with True−Cutoff and Ring−Killer |
| 中文描述： | 1.2 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | MICRO PACKAGE, 10 PIN |
| 文件頁數(shù)： | 11/13頁 |
| 文件大小： | 163K |
| 代理商： | NCP1423DMR2 |
NCP1423
http://onsemi.com
11
IC is enabled again, and the internal circuit typically
consumes 9 A of current from the OUT pin during normal
operation.
LowBattery Detection
A comparator with 15 mV hysteresis is applied to perform
the lowbattery detection function. When Pin 9 (LBI) is at
a voltage (defined by a resistor divider from the battery
voltage) lower than the internal reference voltage of 0.5 V,
the comparator output turns on a 50 low side switch. It
pulls down the voltage at Pin 10 (LBO) which has hundreds
of k of pullhigh resistance. If the Pin 9 voltage is higher
than 0.5 V+15 mV, the comparator output turns off the 50
low side switch. When this occurs, Pin 10 becomes high
impedance and its voltage is pulled high again.
Auto Discharge
Auto discharge function is using for ensure the output
voltage status after the power down occur. This function is
using for communication with a digital signal. When auto
discharge function is enabled, the ADEN is set high; the
output capacitor will be discharged after the device is
shutdown. The capacitors connected to the output are
discharged by an integrated switch of 100 . The residual
voltage on V
OUT
will be less than 0.4 V after auto discharge.
APPLICATIONS INFORMATION
Output Voltage Setting
A typical application circuit is shown in Figure 1, The
output voltage of the converter is determined by the external
feedback network comprised of R1 and R2 and the
relationship is given by:
VOUT
0.5 V
1
R1
R2
where R1
and R2 are the upper and lower feedback resistors,
respectively.
Low Battery Detect Level Setting
The Low Battery Detect Voltage of the converter is
determined by the external divider network comprised of R3
and R4 and the relationship is given by:
VLBI
0.5 V
1
R3
R4
where R3
and R4 are the upper and lower divider resistors
respectively.
Inductor Selection
The NCP1423 is tested to produce optimum performance
with a 5.6 H inductor at V
IN
= 1.3 V, V
OUT
= 3.3 V,
supplying an output current up to 200 mA. For other input
/ output requirements, inductance in the range 3 H to 10 H
can be used according to end application specifications.
Selecting an inductor is a compromise between output
current capability, inductor saturation limit and tolerable
output voltage ripple. Low inductance values can supply
higher output current but also increase the ripple at output
and decrease efficiency. On the other hand, high inductance
values can improve output ripple and efficiency; however,
it also limited the output current capability at the same time.
Another parameter of the inductor is its DC resistance.
This resistance can introduce unwanted power loss and
reduce overall efficiency. The basic rule is to select an
inductor with lowest DC resistance within the board space
limitation of the end application.
Capacitors Selection
In all switching mode boost converter applications, both
the input and output terminals see impulsive voltage /
current waveforms. The currents flowing into and out of the
capacitors multiply with the Equivalent Series Resistance
(ESR) of the capacitor to produce ripple voltage at the
terminals. During the SynRect switchoff cycle, the
charges stored in the output capacitor are used to sustain the
output load current. Load current at this period and the ESR
combined and reflect as ripple at the output terminals. For all
cases, the lower the capacitor ESR, the lower the ripple
voltage at output. As a general guideline, low ESR
capacitors should be used.
PCB Layout Recommendations
Good PCB layout plays an important role in switching
mode power conversion. Careful PCB layout can help to
minimize ground bounce, EMI noise, and unwanted
feedback that can affect the performance of the converter.
Hints suggested below can be used as a guideline in most
situations.
Grounding
A starground connection should be used to connect the
output power return ground, the input power return ground,
and the device power ground together at one point. All
highcurrent paths must be as short as possible and thick
enough to allow current to flow through and produce
insignificant voltage drop along the path. The feedback
signal path must be separated from the main current path and
sense directly at the anode of the output capacitor.
Components Placement
Power components (i.e. input capacitor, inductor and
output capacitor) must be placed as close together as
possible. All connecting traces must be short, direct and
thick. High current flowing and switching paths must be
kept away from the feedback (FB, Pin 3) terminal to avoid
unwanted injection of noise into the feedback path.
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| NCP1423DMR2G | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 800mA PFM Boost w/Ring Killer 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 |
| NCP1423EVB | 功能描述:電源管理IC開發(fā)工具 ANA NCP1423 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| NCP1442FR4 | 功能描述:IC REG MULTI CONFIG POWERFLEX7 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:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:125mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應(yīng)商設(shè)備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR |
| NCP1442T | 功能描述:IC REG MULTI CONFIG ADJ TO220-7 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:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:125mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應(yīng)商設(shè)備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR |
| NCP1442TG | 制造商:ON Semiconductor 功能描述:CONV DC-DC SGL-OUT NON-INV/INV/STEP UP/STEP DOWN 7PIN TO-220 - Rail/Tube |
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