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參數(shù)資料
| 型號(hào)： | LT3571IUD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.57 A SWITCHING REGULATOR, 2300 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 3 X 3 MM, 0.50 MM PITCH, LEAD FREE, PLASTIC, MO-220WEED-2, QFN-16 |
| 文件頁(yè)數(shù)： | 15/16頁(yè) |
| 文件大?。?/td> | 215K |
| 代理商： | LT3571IUD#PBF |
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LT3571
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The LT3571 boost converter uses a constant-frequency
current mode control scheme to provide excellent line
and load regulation. Operation can be best understood
by referring to the Block Diagram in Figure 1. At the
start of each oscillator cycle, the SR latch is set, which
turns on the Q1 power switch. A voltage proportional to
the switch current is added to a stabilizing ramp and the
resulting sum is fed into the positive terminal of the PWM
comparator, A4. When this voltage exceeds the level at
the negative input of A4, the SR latch is reset, turning
off the power switch. The level at the negative input of
A4 is set by the error amplier A3. A3 has two inputs,
one from the voltage feedback loop and the other one
from the current loop. Whichever feedback input is lower
takes precedence and forces the converter into either
constant-current or constant-voltage mode. The LT3571 is
designed to transition cleanly between these two modes of
operation. The current sense amplier senses the voltage
across RSENSE and provides a pre-gain to amplier A1.
The output of A1 is simply an amplied version of the
difference between the voltage across RSENSE and 200mV.
In this manner, the error amplier sets the correct peak
switch current level to regulate through RSENSE. The FB
voltage loop is implemented by the amplier A2. When
the voltage loop dominates, the error amplier regulates
the FB pin to the lower of 1V, or externally provided CTRL
voltage (constant-voltage mode), and sets the correct peak
current level to keep the output in regulation.
The LT3571 has an integrated high side APD current monitor
with a 5:1 ratio. The voltage drop across the MONIN pin and
APD pin is xed at 5V. The MONIN pin can accept a supply
voltage up to 75V, which is suitable for APD photodiode
applications. The MON pin has an open-circuit protection
feature and is internally clamped to 11.5V.
If an APD is tied to the APD pin, the current will be mir-
rored to the MON pin and converted to a voltage signal
by the resistor R4. This voltage signal can be used to
drive an external control block to adjust the APD voltage
by adjusting the feedback threshold of EAMP A2 through
the CTRL input.
OPERATION
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3572 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Full-Bridge Piezo Driver with 900mA Boost Converter |
| LT3572EUF#PBF | 功能描述:IC DRIVER PIEZO DUAL 20-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電機(jī)和風(fēng)扇控制器，驅(qū)動(dòng)器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:步進(jìn)電機(jī)驅(qū)動(dòng)器，1-2 相，2 相 評(píng)估套件:- 輸出數(shù):1 電流 - 輸出:800mA 電壓 - 負(fù)載:10 V ~ 28 V 電源電壓:4.75 V ~ 5.25 V 工作溫度:-20°C ~ 90°C 安裝類型:表面貼裝 封裝/外殼:28-SOP + 2 翼片裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:28-HSOPHC（15.2x7.9） 包裝:剪切帶 (CT) 其它名稱:869-1268-1 |
| LT3572EUF#TRPBF | 功能描述:IC DRIVER PIEZO DL 20-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電機(jī)和風(fēng)扇控制器，驅(qū)動(dòng)器 系列:- 產(chǎn)品變化通告:ATA683(3,4)PLQW Obsolescence 09/Aug/2012 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:DC 電機(jī)控制器，無(wú)刷（BLDC），3 相 評(píng)估套件:可供 輸出數(shù):1 電流 - 輸出:100mA 電壓 - 負(fù)載:5.25 V ~ 20 V 電源電壓:5.25 V ~ 20 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:48-VQFN（7x7） 包裝:剪切帶 (CT) 其它名稱:ATA6833-PLQWCT |
| LT3572EUF-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Full-Bridge Piezo Driver with 900mA Boost Converter |
| LT3572EUF-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Full-Bridge Piezo Driver with 900mA Boost Converter |
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