- 您现在的位置：买卖IC网 > PDF目录14205 > MIC4723YML TR (Micrel Inc)IC REG BUCK ADJ 3A 12MLF PDF资料下载
参数资料
| 型号： | MIC4723YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 9/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 12MLF |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 1V |
| 输入电压： | 2.7 V ~ 5.5 V |
| 频率 - 开关： | 2MHz |
| 电流 - 输出： | 3A |
| 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： | 12-VFDFN 裸露焊盘，12-MLF? |
| 包装： | 标准包装 |
| 供应商设备封装： | 12-MLF?（4x4） |
| 产品目录页面： | 1093 (CN2011-ZH PDF) |
| 其它名称： | 576-1656-6 |
V OUT 2 ?
? ?
V IN ?
I OUT =
D =
T ON =
Micrel, Inc.
Application Information
The MIC4723 is a 3A PWM non-synchronous buck
regulator. By switching an input voltage supply, and
filtering the switched voltage through an Inductor and
capacitor, a regulated DC voltage is obtained. Figure 1
shows a simplified example of a non-synchronous buck
converter.
Figure 1. Example of non-synchronous buck converter
For a non-synchronous buck converter, there are two
modes of operation; continuous and discontinuous.
Continuous or discontinuous refer to the inductor
current. If current is continuously flowing through the
inductor throughout the switching cycle, it is in
continuous operation. If the inductor current drops to
zero during the off time, it is in discontinuous operation.
Critically continuous is the point where any decrease in
output current will cause it to enter discontinuous
operation. The critically continuous load current can be
calculated as follows;
?
? V OUT ? ?
?
2.0MHz × 2 × L
Continuous or discontinuous operation determines how
we calculate peak inductor current.
MIC4723
switch is turned on, current flows from the input supply
through the inductor and to the output. The inductor
current is:
Figure 3. On-Time
charged at the rate;
( V IN ? V OUT )
L
To determine the total on-time, or time at which the
inductor charges, the duty cycle needs to be calculated.
The duty cycle can be calculated as;
V OUT
V IN
and the On time is;
D
2.0MHz
Therefore, peak to peak ripple current is;
Continuous Operation
Figure 2 illustrates the switch voltage and inductor
current during continuous operation.
I pk ? pk =
( V IN ? V OUT ) × V OUT
V IN
2.0MHz × L
Since the average peak to peak current is equal to the
load current. The actual peak (or highest current the
inductor will see in a steady-state condition) is equal to
the output current plus ? the peak-to-peak current.
I pk = I OUT +
( V IN ? V OUT ) × V OUT
V IN
2 × 2.0MHz × L
Figure 2. Continuous Operation
The output voltage is regulated by pulse width
modulating (PWM) the switch voltage to the average
required output voltage. The switching can be broken up
into two cycles; On and Off.
During the on-time, Figure 3 illustrates the high side
Figure 4 demonstrates the off-time. During the off-time,
the high-side internal P-channel MOSFET turns off.
Since the current in the inductor has to discharge, the
current flows through the free-wheeling Schottky diode
to the output. In this case, the inductor discharge rate is
(where V D is the diode forward voltage);
June 2008
9
M9999-060308-E
相关PDF资料 |
PDF描述 |
|---|---|
| ECM28DSUS | CONN EDGECARD 56POS DIP .156 SLD |
| GBB22DHLR | CONN EDGECARD 44POS .050 DIP SLD |
| GBB25DHNT | CONN EDGECARD 50POS .050 DIP SLD |
| GCB25DHRT | CONN CARD EXTEND 50POS .050" SLD |
| GBB25DHHT | CONN EDGECARD 50POS .050 DIP SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC4723YMME | 功能描述:直流/直流开关调节器 3A 2MHz Buck Regulator in epad MSOP-10 Pkg RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC4723YMME TR | 功能描述:直流/直流开关调节器 3A 2MHz Buck Regulator in epad MSOP-10 Pkg RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC4723YMMEG11 | 制造商:Micrel 功能描述:The Micrel MIC4723YMMEG11 is a 3A Synchronous Buck Regulator. |
| MIC4724 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:3A 2MHz Integrated Switch Buck Regulator with 6Vmax Input |
| MIC4724YMME | 功能描述:直流/直流开关调节器 3A 2MHz Buck Regulator in Epad MSOP-10 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
发布紧急采购，3分钟左右您将得到回复。