参数资料
| 型号： | LT3571IUD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.47A 16QFN |
| 产品培训模块： | APD Biasing |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 最高 75V |
| 输入电压： | 2.7 V ~ 20 V |
| PWM 型： | 电流/电压模式 |
| 频率 - 开关： | 250kHz ~ 2MHz |
| 电流 - 输出： | 470mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QFN-EP（3x3） |
LT3571
OPERATION
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 ampli?er 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 ampli?er senses the voltage
across R SENSE and provides a pre-gain to ampli?er A1.
The output of A1 is simply an ampli?ed version of the
In this manner, the error ampli?er sets the correct peak
switch current level to regulate through R SENSE . The FB
voltage loop is implemented by the ampli?er A2. When
the voltage loop dominates, the error ampli?er 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.
difference between the voltage across R SENSE and 200mV.
3571fa
8
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相关代理商/技术参数 |
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| LT3572 | 制造商:LINER 制造商全称: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 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 标准包装:1 系列:- 应用:步进电机驱动器，1-2 相，2 相 评估套件:- 输出数:1 电流 - 输出:800mA 电压 - 负载:10 V ~ 28 V 电源电压:4.75 V ~ 5.25 V 工作温度:-20°C ~ 90°C 安装类型:表面贴装 封装/外壳:28-SOP + 2 翼片裸露焊盘 供应商设备封装:28-HSOPHC（15.2x7.9） 包装:剪切带 (CT) 其它名称:869-1268-1 |
| LT3572EUF#TRPBF | 功能描述:IC DRIVER PIEZO DL 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 产品变化通告:ATA683(3,4)PLQW Obsolescence 09/Aug/2012 标准包装:1 系列:- 应用:DC 电机控制器，无刷（BLDC），3 相 评估套件:可供 输出数:1 电流 - 输出:100mA 电压 - 负载:5.25 V ~ 20 V 电源电压:5.25 V ~ 20 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-VQFN（7x7） 包装:剪切带 (CT) 其它名称:ATA6833-PLQWCT |
| LT3572EUF-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Full-Bridge Piezo Driver with 900mA Boost Converter |
| LT3572EUF-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Full-Bridge Piezo Driver with 900mA Boost Converter |
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