- 您现在的位置：买卖IC网 > PDF目录14826 > LT3471EDD#PBF (Linear Technology)IC REG MULTI CONFIG ADJ DL 10DFN PDF资料下载
参数资料
| 型号： | LT3471EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/16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
OPERATION
| V OUT | + | V D | – | V IN |
V OUT = V REF
currentreachesthisvalue,theSRlatchisresetregardless
of the state of the comparator A2 (A4). Also not shown
in the Block Diagram is the thermal shutdown circuit. If
the temperature of the part exceeds approximately 160°C,
APPLICATIONS INFORMATION
Duty Cycle
The typical maximum duty cycle of the LT3471 is 94%.
The duty cycle for a given application is given by:
DC =
| V OUT | + | V D | – | V CESAT |
Where V D is the diode forward voltage drop and V CESAT
is in the worst case 330mV (at 1.3A)
both latches are reset regardless of the state of compara-
tors A2 and A4. The current limit and thermal shutdown
circuits protect the power switch as well as the external
components connected to the LT3471.
For inverting topologies, V FBN is tied to ground and V FBP
is connected between R1 and R2. R2 is between V FBP
and V REF and R1 is between V FBP and V OUT (see the Ap-
plications section for examples). In this case:
R1
R2
Select values of R1 and R2 according to the following
equation:
The LT3471 can be used at higher duty cycles, but it must
be operated in the discontinuous conduction mode so that
the actual duty cycle is reduced.
R1 = R2
V OUT
V REF
Setting Output Voltage
Setting the output voltage depends on the topology used.
For normal noninverting boost regulator topologies:
A good value for R2 is 15k, which sets the current in the
resistor divider chain to 1.00V/15k = 67μA.
Switching Frequency and Inductor Selection
V OUT = V FBP 1 +
R1
R2
The LT3471 switches at 1.2 MHz, allowing for small valued
inductors to be used. 4.7μH or 10μH will usually suf ?ce.
where V FBN is connected between R1 and R2 (see the
Typical Applications section for examples).
Select values of R1 and R2 according to the following
equation:
Choose an inductor that can handle at least 1.4A without
saturating, and ensure that the inductor has a low DCR
(copper-wire resistance) to minimize I 2 R power losses.
Note that in some applications, the current handling
requirements of the inductor can be lower, such as in the
R1 = R2
V OUT
V REF
–1
SEPIC topology where each inductor only carries one half
of the total switch current. For better ef ?ciency, use similar
valued inductors with a larger volume. Many different sizes
A good value for R2 is 15k which sets the current in the
resistor divider chain to 1.00V/15k = 67μA.
and shapes are available from various manufacturers.
Choose a core material that has low losses at 1.2 MHz,
such as ferrite core.
V FBP is usually just tied to V REF = 1.00V, but V FBP can also
be tied to a divided down version of V REF or some other
voltage as long as the absolute maximum ratings for the
feedback pins are not exceeded (see Absolute Maximum
Ratings).
Table 1. Inductor Manufacturers
Sumida (847) 956-0666
TDK (847) 803-6100
Murata (714) 852-2001
www.sumida.com
www.tdk.com
www.murata.com
3471fb
6
相关PDF资料 |
PDF描述 |
|---|---|
| 2000-470-H-RC | INDUCTOR TOROID 47UH 15% HORZ |
| V24B48T150BG | CONVERTER MOD DC/DC 48V 150W |
| MXD1816UR23+T | IC MPU RESET CIRC 2.31V SOT23-3 |
| 381LQ561M180J012 | CAP ALUM 560UF 180V 20% SNAP |
| VI-J1Y-EX-F4 | CONVERTER MOD DC/DC 3.3V 49.5W |
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 |
发布紧急采购，3分钟左右您将得到回复。