- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384734 > MIC2297 (Micrel Semiconductor,Inc.) 40V PWM Boost Regulator White LED Driver PDF資料下載
參數(shù)資料
| 型號(hào)： | MIC2297 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | 40V PWM Boost Regulator White LED Driver |
| 中文描述： | 40V PWM升壓穩(wěn)壓白光LED驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 272K |
| 代理商： | MIC2297 |
Micrel
MIC2297
May 2005
11
M9999-050305
(408) 955-1690
π
=
out
out
p
V
C
I
f
Reference Capacitor
A 1uF ceramic should be used on the reference pin to
prevent noise from getting into this node. A 1uF ceramic is
needed when a PWM signal is connected to the BRT pin.
Diode Selection
The MIC2297 requires an external diode for operation. A
Schottky diode is recommended for most applications due
to their lower forward voltage drop and reverse recovery
time. Ensure the diode selected can deliver the peak
inductor current and the maximum reverse voltage is rated
greater than the output voltage.
Input capacitor
A minimum 1
μ
F ceramic capacitor with an X5R or X7R
dielectric is recommended for designing with the MIC2297.
Increasing input capacitance will improve performance and
greater noise immunity on the source. The input capacitor
should be as close as possible to the inductor and the
MIC2297, with short traces for good noise performance.
The MIC2297 utilizes a feedback pin to compare the LED
current to an internal reference. The LED current is
adjusted by selecting the appropriate feedback resistor
value. The desired output current can be calculated as
follows:
R
V
I
LED
2
=
Compensation
The comp pin is connected to the output of the voltage
error amplifier. The voltage error amplifier is a
transconductance amplifier. Adding a series RC to ground
adds a zero at:
1
1
2
1
R
C
f
zero
π
=
The resistor typically ranges from 10kOhm to 50kOhm.
The capacitor typically ranges from 1nF to 100nF.
Adding a capacitor from comp to ground adds a pole at
2
1
2
1
C
R
f
pole
π
=
This capacitor typically ranges from 100pF to 10nF.
Generally an RC to ground is all that is needed. The RC
should be placed as close as possible to the comp pin.
The capacitor should be a ceramic with a X5R, X7R, or
COG dielectric.
Grounding
Both the AGND and PGND must be connected to the
exposed backside pad. The exposed backside pad also
improves thermal performance. A large ground plane
decreases thermal resistance to ambient air.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC2297-15YML | 40V PWM Boost Regulator White LED Driver |
| MIC2297-42YML | 40V PWM Boost Regulator White LED Driver |
| MIC2507 | Quad Integrated High-Side Switch Not Recommended for New Designs |
| MIC2507BM | Quad Integrated High-Side Switch Not Recommended for New Designs |
| MIC2544 | Programmable Current Limit High-Side Switch(可編程 限流高邊開關(guān)) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2297_08 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:40V PWM Boost Regulator White LED Driver |
| MIC2297-15YML | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:40V PWM Boost Regulator White LED Driver |
| MIC2297-15YML TR | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1.2MHz 1.2A PWM Boost Converter (Lead Free) 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 |
| MIC2297-38YML TR | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1.2MHz 1.2A PWM Boost Converter (Lead Free) 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 |
| MIC2297-38YML-TR | 功能描述:LED 驅(qū)動(dòng)器 IC 1 輸出 DC DC 穩(wěn)壓器 升壓（升壓） PWM 調(diào)光 1.2A（開關(guān)） 10-MLF?（3x3） 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):停產(chǎn) 類型:DC DC 穩(wěn)壓器 拓?fù)?升壓（升壓） 內(nèi)部開關(guān):是 輸出數(shù):1 電壓 - 供電（最低）:2.5V 電壓 -?供電（最高）:10V 電壓 - 輸出:- 電流 - 輸出/通道:1.2A（開關(guān)） 頻率:600kHz 調(diào)光:PWM 應(yīng)用:- 工作溫度:-40°C ~ 125°C （TJ） 安裝類型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤，10-MLF? 供應(yīng)商器件封裝:10-MLF?（3x3） 標(biāo)準(zhǔn)包裝:1 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。