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參數(shù)資料
| 型號(hào)： | MP1529 |
| 廠商： | Monolithic Power Systems, Inc. |
| 英文描述： | Fixed Frequency Step-Up Converter LCD Backlight Plus Flash |
| 中文描述： | 固定頻率升壓轉(zhuǎn)換器液晶背光加閃光 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 312K |
| 代理商： | MP1529 |
MP1529 – FIXED FREQUENCY STEP-UP CONVERTER LCD BACKLIGHT PLUS FLASH
MP1529 Rev. 1.0
11/23/2005
www.MonolithicPower.com
9
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2005 MPS. All Rights Reserved.
TM
Selecting the Inductor
The inductor is required to force the output
voltage higher while being driven by the lower
input voltage. Choose an inductor that does not
saturate at the SW current limit.
A good rule for determining the inductance is to
allow the peak-to-peak ripple current to be
approximately 30%-50% of the maximum input
current. The maximum input current usually
occurs in flash mode. Make sure that the peak
inductor current is below 75% of the typical
current limit to prevent loss of regulation due to
the current limit variation.
Calculate the required inductance value L using
the equations:
I
f
V
)
V
×
-
(V
V
L
SW
OUT
IN
OUT
×
IN
=
η
×
)
I
×
=
IN
FL
_
LED
I
OUT
V
)
MAX
(
IN
I
V
(
)
MAX
(
IN
%
50
%
30
I
=
Where
I is the peak-to-peak inductor ripple
current and
η
is the efficiency at flash mode. A
4.7μH or 10μH inductor is recommended for
most cell phone applications.
Selecting the Diode
The output rectifier diode supplies current to the
inductor when the internal MOSFET is off. To
reduce losses due to diode forward voltage and
recovery time, use a Schottky diode.
Choose a diode whose maximum reverse
voltage rating is greater than the maximum
output voltage. For output voltage less than
20V, it is recommended to choose the
MBR0520 for most applications.
Selecting the Compensation Capacitor
The compensation capacitor needs to be
determined so that the control loop is slow
enough to allow for stable and smooth mode
transition.
A
1μF
ceramic
recommended for most cell phone applications.
capacitor
is
Selecting the Soft-Start Capacitor
The soft-start capacitor sets both the soft-start
timer and the PWM timer. A 10nF to 22nF
capacitor
is
recommended
applications.
for
most
Layout Considerations
High frequency switching regulators require
very careful layout for stable operation and low
noise. All components must be placed as close
to the IC as possible. Keep the path between
the SW pin, output diode, output capacitor and
GND pin extremely short for minimal noise and
ringing. The input capacitor must be placed
close to the IN pin for best decoupling. All
current setting resistors must be kept close to
the corresponding ISET pin to prevent noise
injection for accurate LED current setting. The
ground return of the input and output capacitors
should be tied close to the GND pin. See the
MP1529 demo board layout for reference.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MP1529DR | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:Fixed Frequency Step-Up Converter LCD Backlight Plus Flash |
| MP1529DR-LF-P | 功能描述:LED照明驅(qū)動(dòng)器 2x6 backlight 1x4 flash WLED Driver RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MP1529DR-LF-Z | 功能描述:LED照明驅(qū)動(dòng)器 2x6 backlight 1x4 flash WLED Driver RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MP152-BP | 制造商:Micro Commercial Components (MCC) 功能描述:Diode Rectifier Bridge Single 200V 15A 4-Pin MP-50 Bulk |
| MP152W | 功能描述:橋式整流器 15A 200V LP RoHS:否 制造商:Vishay 產(chǎn)品:Single Phase Bridge 峰值反向電壓:1000 V 最大 RMS 反向電壓: 正向連續(xù)電流:4.5 A 最大浪涌電流:450 A 正向電壓下降:1 V 最大反向漏泄電流:10 uA 功率耗散: 最大工作溫度:+ 150 C 長度:30.3 mm 寬度:4.1 mm 高度:20.3 mm 安裝風(fēng)格:Through Hole 封裝 / 箱體:SIP-4 封裝:Tube |
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