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| 型号： | LT3471EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ DL 10DFN |
| 标准包装： | 121 |
| 类型： | 升压（升压），反相，回扫，Sepic |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 1 V ~ 40 V |
| 输入电压： | 2.4 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 1.3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-DFN（3x3） |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
LT3471
APPLICATIONS INFORMATION
By choosing the appropriate values for the resistor and
capacitor, the zero frequency can be designed to improve
the phase margin of the overall converter. The typical
target value for the zero frequency is between 35kHz
to 55kHz. Figure 3 shows the transient response of the
step-up converter from Figure 2 without the phase lead
capacitor C PL . Although adequate for many applications,
phase margin is not ideal as evidenced by 2-3 “bumps”
in both the output voltage and inductor current. A 33pF
capacitor for C PL results in ideal phase margin, which
is revealed in Figure 4 as a more damped response and
less overshoot.
V REG VOLTAGE REFERENCE
Pin 3 of the LT3471 is a bandgap voltage reference that has
been divided down to 1.00V and buffered for external use.
This pin must be bypassed with at least 0.01μF and no more
than 1μF. This will ensure stability as well as reduce the
noise on this pin. The buffer has a built-in current limit of at
least 1mA (typically 1.4mA). This not only means that you
can use this pin as an external reference for supplemental
circuitry, but it also means that it is possible to provide a
soft-start feature if this pin is used as one of the feedback
pins for the error ampli?er. Normally the soft-start time
will be dominated by the RC time constant discussed in
the soft-start and shutdown section. However, because of
the ?nite current limit of the buffer for the V REG pin, it will
V OUT
200mV/DIV
AC COUPLED
I L1
0.5A/DIV
AC/COUPLED
LOAD CURRENT
V IN = 3.3V
V IN > V SHDN /SS
take some time to charge up the bypass capacitor. During
this time, the voltage at the V REG pin will ramp up, and
this action provides an alternate means for soft-starting
the circuit. If the largest recommended bypass capacitor
is used, 1μF, the worst-case (longest) soft-start function
that would be provided from the V REF pin is:
100mA/DIV
AC/COUPLED
50μs/DIV
1 μ F ? 1.00V
1.0mA
= 1.0ms
Figure 3. Transient Response of Figure 2’s Step-Up
Converter without Phase Lead Capacitor
Choose the RC network such that the soft-start time is
longer than this time, or choose a smaller bypass capacitor
for the V REF pin (but always larger than 0.01μF) so that the
RC network dominates the soft-starting of the LT3471. The
voltage at the V REF pin can also be divided down and used
V OUT
200mV/DIV
AC COUPLED
I L1
0.5A/DIV
AC/COUPLED
LOAD CURRENT
100mA/DIV
V IN = 3.3V
V IN > V SHDN /SS
for one of the feedback pins for the error ampli?er. This
is especially useful in LED driver applications, where the
current through the LEDs is set using the voltage reference
across a sense resistor in the LED chain. Using a smaller
or divided down reference leads to less wasted power in
the sense resistor. See the Typical Applications section
for an example of LED driving applications.
AC/COUPLED
50μs/DIV
Figure 4. Transient Response of Figure 2’s Step-Up
Converter with 33pF Phase Lead Capacitor
3471fb
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3472 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Boost and Inverting DC/DC Converter for CCD Bias |
| LT3472EDD | 功能描述:IC REG BOOST INV ADJ 50MA 10DFN RoHS:否 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:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LT3472EDD#PBF | 功能描述:IC REG BOOST INV ADJ 50MA 10DFN 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3472EDD#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER BOOST 1.1MHZ 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BOOST, 1.1MHZ, DFN-10 |
| LT3472EDD#TR | 功能描述:IC REG BOOST INV ADJ 50MA 10DFN RoHS:否 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:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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