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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(yè)數(shù)： | 8/11頁(yè) |
| 文件大小： | 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
8
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2005 MPS. All Rights Reserved.
TM
Table 1—Enable Operation Table
(5, 6, 7)
EN2
Strings 1 & 2: LCD Backlight LEDs
L
Off
L
On (PWM)
Mode
Off
Backlight
Backlight plus
Preview
Flash
Notes:
5) Backlight and Backlight plus Preview may use PWM for backlight brightness control. Only strings 1 & 2 will respond to high speed PWM.
String 3 will remain continuously on or off depending on the mode.
6) Any combination of backlight string may be used. 1 or 2 or 1 & 2 will regulate properly. The part uses over voltage detection to determine
which strings are available to light. The remaining strings are then used for regulation. The part will not remain in an open loop mode if
there is at least one string of LEDs to light.
7) Changing from backlight plus preview to flash will have a delay equal to the soft-start timer due to the PWM filtering necessary for preview.
Switching the part to off mode then to flash will cancel the timer. This will take a few microseconds instead of the 10 milliseconds typically
associated with the timer being active.
EN1
L
H (PWM)
String 3: Flash LEDs
Off
Off
H (PWM)
H
On (PWM)
Preview current
L
H
Off
Flash current
APPLICATION INFORMATION
Setting the LED currents
Resistors RS1, RS2 and RS3 set the backlight
LED string (LED1 and LED2) current, the flash
LED string (LED3) preview current, and the
flash
LED
string
Determine each current setting resistor in k
by
the equations:
current,
respectively.
BL
_
LED
SET
V
I
950
1
RS
×
=
PV
_
LED
SET
V
I
1100
2
RS
×
=
FL
_
LED
SET
V
I
1000
3
RS
×
=
Where V
SET
is the internal reference voltage,
typically 1.216V. I
LED_BL
, I
LED_PV
and I
LED_FL
are
the backlight LED string current, the flash LED
string preview current, and the flash LED string
flash current in mA, respectively.
Selecting the Input Capacitor
An input capacitor is required to supply the AC
ripple current to the inductor, while limiting
noise at the input source. This capacitor must
have low ESR, so ceramic is the best choice.
Use an input capacitor value of 4.7
μ
F or
greater. This capacitor must be placed
physically close to the IN pin. Since it reduces
the voltage ripple seen at IN, it also reduces the
amount of EMI passed back along that line to
the other circuitry.
Selecting the Output Capacitor
A single 1μF to 4.7μF ceramic capacitor usually
provides sufficient output capacitance for most
applications. The impedance of the ceramic
capacitor at the switching frequency is
dominated by the capacitance, and so the
output voltage ripple is mostly independent of
the ESR. The output voltage ripple V
RIPPLE
is
calculated as:
(
)
SW
UT
O
IN
UT
C
O
×
LED
V
RIPPLE
V
f
2
V
V
I
×
=
Where V
OUT
is the output voltage, V
IN
is the
input voltage, I
LED
is the total LED current, C2 is
the capacitance of the output capacitor, and f
SW
is the 1.2MHz switching frequency.
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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(chēng):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(zhǎng)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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