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參數(shù)資料
| 型號(hào)： | BD9870FPS |
| 元件分類(lèi)： | 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(yè)數(shù)： | 8/13頁(yè) |
| 文件大小： | 1032K |
| 代理商： | BD9870FPS |
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Block Function Explanations
·
VREF
Generates the regulated voltage from Vcc input, compensated for temperature.
·
OSC
Generates the triangular wave oscillation frequency (900kHz) using an internal resistors and capacitor. Used for PWM comparator
input.
·
Error AMP
This block, via the INV pin, detects the resistor-divided output voltage, compares this with the reference voltage, then amplifies
and outputs the difference.
·
PWM COMP
Outputs PWM signals to the Driver block, which converts the error amp output voltage to PWM
form.
·
DRIVER
This push-pull FET driver powers the internal Pch MOSFET, which accepts direct PWM input.
·
STBY
Controls ON/OFF operation via the STBY pin. The output is ON when STBY is High.
·
Thermal Shutdown (TSD)
This circuit protects the IC against thermal runaway and damage due to excessive heat. A thermal sensor detects the junction
temperature and switches the output OFF once the temperature exceeds a threshold value (175°C). Hysteresis is built in
(15°C) in order to prevent malfunctions due to temperature fluctuations.
·
Over Current Protection (OCP)
The OCP circuit detects the voltage difference between Vcc and OUT by measuring the current through the internal Pch
MOSFET and switches the output OFF once the voltage reaches the threshold value. The OCP block is a self-recovery type (not
latch).
·
Soft Start (SS)
This block conducts soft start operations. When STBY is High and the IC starts up the internal capacitor begins charging. The soft
start time is fixed at 5ms.
●Notes for PCB layout
Place capacitors between Vcc and Ground, and the Schottky diode as close as possible to the IC to reduce noise and maximize
efficiency.
Connect resistors between INV and Ground, and the output capacitor filter at the same Ground potential in order to stabilize the
output voltage.
（If the patterning is longer or thin, it’s possible to cause ringing or waveform crack.）
4
5
2
FIN
1
INV
STBY
R2:1kΩ
R1:4kΩ
C3
VCC
OUT
GND
C2
C1
5.0V
L1
D1
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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(kāi)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(kāi)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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