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| 型号： | IR3638STRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 13/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 14-SOIC |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 440kHz |
| 占空比： | 95% |
| 电源电压： | 5 V ~ 13.2 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 125°C |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 产品目录页面： | 1384 (CN2011-ZH PDF) |
| 其它名称： | IR3638STRPBFDKR |
IR3638SP b F
For this design we have:
Layout Consideration
The layout is very important when designing high
V in =5V
frequency switching converters. Layout will affect
V o =1.2V
noise pickup and can cause a good design to
V osc =1.25V
perform with less than expected results.
V p =1.0V
Start to place the power components, make all
g m =450umoh
the connection in the top layer with wide, copper
L o =1.0uH
filled areas.
C o =1x470uF, ESR=10mOhm
The inductor, output capacitor and the MOSFET
F s =400kHz
should be close to each other as possible. This
helps to reduce the EMI radiated by the power
These result to:
traces due to the high switching currents through
them. Place input capacitor directly to the drain of
F LC =7.3kHz
the high-side MOSFET, to reduce the ESR
F ESR =33.8kHz
replace the single input capacitor with two
F s/2 =200kHz
parallel units.
The feedback part of the system should be kept
Select crossover frequency:
away from the inductor and other noise sources.
The critical bypass components such as
Fo=40kHz
capacitors for Vcc and Vc should be close to
respective pins. It is important to place the
Since: F LC <F ESR <F o <F s/2 , typeII compensation is
feedback components include feedback resistors
selected to place the poles and zeros.
and compensation components close to Fb and
Comp pins.
Using equations 12, 13 and 15 will result to the
In multilayer PCB use one layer as power ground
following compensation values:
plane and have a control circuit ground (analog
ground), to which all signals are referenced. The
R 3 =
V osc * F o * F ESR * ( R 1 + R 2 )
2
V in * F LC * R 2 * g m
- - - (13)
goal is to localize the high current path to a
separate loop that does not interfere with the
more sensitive analog control function. These two
grounds must be connected together on the PC
R 3 = 16 . 76 K , Select R 3 = 16 . 2 K
board layout at a single point.
F z =
1
2 π * R 3 * C 4
- - - (12)
C 4 = 1 . 78 nF , Select C 4 = 1 . 8 nF
C POLE ?
1
π * R 3 * F s
- - - (15)
C POLE = 49 pF , Select C POLE ≤ 22 pF
3/19/07
13
相关PDF资料 |
PDF描述 |
|---|---|
| IR3640MPBF | IC REG CTRLR BUCK PWM VM 20-MLPQ |
| IR3651STRPBF | IC REG CTRLR BUCK PWM VM 14-SOIC |
| IR3710MTRPBF | IC REG CTRLR BUCK PWM 16-MLPQ |
| IR3720MTRPBF | IC POWER SUPPLY MONITOR 10-DFN |
| IR3721MTRPBF | IC POWER SUPPLY MONITOR 10-DFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3640MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 20-MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| IR3640MTRPBF | 功能描述:开关变换器、稳压器与控制器 HI FREQ SYNC PWM 4.5 to 5.5V 1.5MHz RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| IR3651 | 制造商:IRF 制造商全称:International Rectifier 功能描述: |
| IR3651SPBF | 功能描述:IC REG CTRLR BUCK PWM VM 14-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| IR3651STRPBF | 功能描述:电压模式 PWM 控制器 High Volt Sych PWM 100V 400Mhz 1.25 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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