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參數(shù)資料
| 型號： | BD9870FPS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 990 kHz SWITCHING FREQ-MAX, PSSO4 |
| 封裝： | LEAD FREE, TO-252, 5 PIN |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 1032K |
| 代理商： | BD9870FPS |
5/12
●Application component selection and settings
Inductor L1
A large inductor series impedance will result in deterioration of efficiency. OCP operation greater than 1.6A may cause inductor
overheating, possibly leading to overload or output short.
Note that the current rating for the coil should be higher than I
OUT(MAX)＋⊿IL.
Iout（MAX）: maximum load current
If you flow more than maximum current rating, coil will become overload, and cause magnetic saturation, and those account for
efficiency deterioration. Select from enough current rating of coil which doesn’t over peak current.
L1：inductor value, VCC：maximum input voltage, VOUT：output voltage, ⊿IL：coil ripple current value, fosc：oscillation frequency
If you make a point of efficiency, we will recommend C10-H5R(mitsumi).The efficiency will improve about 1-2%.
Schottky Diode D1
A Schottky diode with extremely low forward voltage should be used. Selection should be based on the following guidelines
regarding maximum forward current, reverse voltage, and power dissipation:
·The maximum current rating is higher than the combined maximum load current and coil ripple current (⊿I
L).
·The reverse voltage rating is higher than the VIN value.
·Power dissipation for the selected diode must be within the rated level.
The power dissipation of the diode is expressed by the following formula:
Pdi=Iout(MAX)×Vf×(1-VOUT/VCC)
Iout（MAX）: maximum load current, Vf: forward voltage, VOUT: output voltage, VCC: input voltage
Output Capacitor C1
A suitable output capacitor should satisfy the following formula for ESR:
Another factor that must be considered is the permissible ripple current. Select a capacitor with sufficient margin, governed by the
following formula:
IRMS =⊿IL/2√3
IRMS: effective value of ripple current to the output capacitor, ⊿IL : coil ripple current
Use ceramic capacitor over B characteristic of temperature. Except that, it is possible to cause abnormal movement of IC.
It’s depends on ambient temperature or output voltage setting
Also it is possible to use Al electronic capacitor, but use it by enough confirmation.
Input Capacitor C2
The input capacitor is the source of current flow to the coil via the built-in Pch FET when the FET is ON. When selecting the
input capacitor sufficient margin must be provided to accommodate capacitor voltage and permissible ripple current. The
expression below defines the effective value of the ripple current to the input capacitor. It should be used in determining the
suitability of the capacitor in providing sufficient margin for the permissible ripple current.
IRMS : effective value of the ripple current to the input capacitor
IOUT : output load current, VOUT: output voltage, VCC: input voltage
⊿IL =
L1
(VCC－VOUT)
VOUT
VCC
f
osc
1
×
ESR≦⊿VL/⊿IL
⊿VL : permissible ripple voltage, ⊿IL : coil ripple current
IRMS＝IOUT×√
(1－VOUT / VCC)×VOUT / VCC
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BD9870FPS_09 | 制造商:ROHM 制造商全稱:Rohm 功能描述:Simple Step-down Switching Regulator with Built-in Power MOSFET |
| BD9870FPS-E2 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 900 kHz SINGLE CHAN STEP DOWN SWITCHING RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| BD9873CP-V5 | 制造商:ROHM 制造商全稱:Rohm 功能描述:Simple Step-down Switching Regulators with Built-in Power MOSFET |
| BD9873CP-V5E2 | 制造商:ROHM 制造商全稱:Rohm 功能描述:Simple Step-down Switching Regulators with Built-in Power MOSFET |
| BD9873CP-V5-E2 | 制造商:ROHM Semiconductor 功能描述: |
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