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參數(shù)資料
| 型號： | SC1109CSTR |
| 廠商： | Semtech Corporation |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 無電容，NMOS管，150mA的低壓差穩(wěn)壓器的反向電流保護 |
| 文件頁數(shù)： | 11/17頁 |
| 文件大?。?/td> | 223K |
| 代理商： | SC1109CSTR |
SYNCHRONOUS PWM CONTROLLER WITH
DUAL LOW DROPOUT REGULATOR
CONTROLLERS
2000 SEMTECH CORP.
PRELIMINARY - October 16, 2000
SC1109
11
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
Mosfet gate drive can be provided by an external 12V
supply that is connected from BST to GND. The
actual gate to source voltage of the upper Mosfet will
approximately equal 7V (12V-VCC). If the external
12V supply is not available, a classical boot strap
technique can be implemented from the VCC supply.
A boot strap capacitor is connected from BST to
Phase while VCC is connected through a diode
(Schottky or other fast low VF diode) to the BST. This
will provide a gate to source voltage approximately to
VCC-Vdiode drop.
Shoot through control circuitry provides a 100ns dead
time to ensure both upper and lower MOSFET will not
turn on simultaneously and cause a shoot through
condition.
OVER CURRENT
Upper Mosfet’s Rdson is used to monitor the drop
across the top FET due to an over current condition.
This Method of current sensing minimizes any unnec-
essary losses due to external sense resistance.
An internal comparator with a 200mV reference moni-
tors the Drop across the upper FET, Once the Vdson
of the Mosfet exceeds the 200mV limit, the low side
gate is turned on and the upper FET is turned off.
Also an internal latch is set and the Soft start capaci-
tor is discharged. Once the lower threshold of the soft
start circuit is crossed, the same Softstart sequence
mentioned previously is repeated. This sequence is
repeated until the over condition is removed.
GATE DRIVERS
The Low side gate driver is supplied from VCC and
provide a peak source/sink current of and 500mA.
The high side gate drive is also capable of sourcing
and sinking peak currents of 500mA. The high side
Lower Gate
PhaseNode
Lower Gate
Upper Gate
Lower Gate
PhaseNode
Vtt Shorted
Upper Gate
Lower Gate
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC1109EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:SYNCHRONOUS PWM CONTROLLER WITH DUAL LOW DROPOUT REGULATOR CONTROLLERS |
| SC110CP | 功能描述:音頻指示器及警報器 CHIME, 30-120VAC/DC 2900HZ, CUL APPRVD RoHS:否 制造商:PUI Audio 產(chǎn)品:Indicators 聲壓級:85 dB 音調(diào):Continuous 頻率:2300 Hz +/- 300 Hz 電壓額定值:5 VDC 電流額定值:30 mA 端接類型: 直徑:12 mm 安裝:Through Hole |
| SC110D | 功能描述:音頻指示器及警報器 CONSTANT, 30-120V 1900HZ, CUL APPRVD RoHS:否 制造商:PUI Audio 產(chǎn)品:Indicators 聲壓級:85 dB 音調(diào):Continuous 頻率:2300 Hz +/- 300 Hz 電壓額定值:5 VDC 電流額定值:30 mA 端接類型: 直徑:12 mm 安裝:Through Hole |
| SC110DJ | 功能描述:音頻指示器及警報器 SLOW PULSE, 30-120V 1900HZ, CUL APPRVD RoHS:否 制造商:PUI Audio 產(chǎn)品:Indicators 聲壓級:85 dB 音調(diào):Continuous 頻率:2300 Hz +/- 300 Hz 電壓額定值:5 VDC 電流額定值:30 mA 端接類型: 直徑:12 mm 安裝:Through Hole |
| SC110DJR | 功能描述:音頻指示器及警報器 SLOW PULSE, 30-120V 1900HZ, CUL APPRVD RoHS:否 制造商:PUI Audio 產(chǎn)品:Indicators 聲壓級:85 dB 音調(diào):Continuous 頻率:2300 Hz +/- 300 Hz 電壓額定值:5 VDC 電流額定值:30 mA 端接類型: 直徑:12 mm 安裝:Through Hole |
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