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| 型号： | LT3571EUD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16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
APPLICATIONS INFORMATION
Switching Frequency
There are two methods to set the switching frequency of the
LT3571. Both methods require a resistor connected at the
Table 2 gives inrush peak currents for some component
selections.
Table 2. Inrush Peak Current
R T pin. Do not leave the R T pin open. Also, do not load this
pin with a capacitor. A resistor must always be connected
for proper operation. One way to set the frequency is simply
V IN (V)
5
5
L (μH)
10
22
C (μF)
1
1
I P (A)
0.81
0.63
connecting an external resistor between the R T pin and
GND. See Table 1 or the Oscillator Frequency vs R T graph
in the Typical Performance Characteristics for resistor
values and corresponding switching frequencies. The other
way is to make the LT3571 synchronize with an external
clock via the SYNC pin. For proper operation, a resistor
should be connected at the R T pin and able to generate
a switching frequency 20% lower than the external clock
when the external clock is absent.
Table 1. Switching Frequency vs R T
Setting Output Voltage
The LT3571 is equipped with both an internal 1V reference
and an auxiliary reference input (the CTRL pin). This
feature allows users to select between using the built-in
reference and supplying an external reference voltage.
The voltage at the CTRL pin can be adjusted while the
chip is operating, to alter the output voltage of LT3571
for purposes such as APD’s bias voltage adjustment. To
use the internal 1V reference, the CTRL pin should be held
R1 = R2 ? MONIN – 1 ?
Switching Frequency (kHz)
250
500
1000
1500
2000
2500
Inrush Current
R T (k)
56.2
26.1
12.1
6.81
4.22
2.67
higher than 1.2V, which can be done by tying it to V REF .
When the CTRL pin is between 0V and 1V, the LT3571 will
regulate the output such that the FB pin voltage is equal
to the CTRL pin voltage. To set the output voltage, select
the values of R1 and R2 (see Figure 2) according to the
following equation:
? V ?
? V1 ?
The LT3571 has a built-in Schottky diode for the boost
converter. When supply voltage is applied to the V IN pin, the
voltage difference between V IN and V OUT generates inrush
current ?owing from input through the inductor and the
Schottky diode (D1 in the Block Diagram), to charge the
output capacitor. The selection of inductor and capacitor
where V1 = 1V if the internal reference is used, or V1 =
CTRL if CTRL is between 0V and 1V. R2 can be selected to
load the output to maintain a constant switching frequency
when the APD load is very low. Preventing entry into
pulse-skipping mode is an important consideration for
post ?ltering the regulator output.
value should ensure the peak of the inrush current to below
1A. In addition, the LT3571 turn-on should be delayed until
MONIN
3
the inrush current is less than the maximum current limit.
The peak inrush current can be estimated as follows:
14
LT3571
CTRL
FB
15
R1
I P = IN
–1
? 2 L – 1 ?
V – 0.9
L
C
? ?
? π ?
? exp ? – ?
? C ?
R2
3571 F02
Figure 2. Output Voltage Feedback Connection
where L is the inductance, and C is the output capacitance.
3571fa
9
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| LT3571IUD#PBF | 功能描述:IC REG BOOST ADJ 0.47A 16QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3571IUD#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER CURRENT MODE 制造商:Linear Technology 功能描述:DC-DC CONVERTER, CURRENT MODE, 2MHZ, QFN |
| LT3571IUD#TRPBF | 功能描述:IC REG BOOST ADJ 0.47A 16QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| 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 |
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