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参数资料
| 型号： | IR3629AMTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 17/23页 |
| 文件大小： | 0K |
| 描述： | IC CTLR PWM SYNC BUCK 12-MLPD |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 1 |
| 应用： | 控制器，DDR |
| 输入电压： | 4.5 V ~ 14 V |
| 输出数： | 1 |
| 输出电压： | 可调至 0.6V |
| 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 |
| 供应商设备封装： | 12-MLPD |
| 包装： | 标准包装 |
| 产品目录页面： | 1383 (CN2011-ZH PDF) |
| 其它名称： | IR3629AMTRPBFDKR |
IR3629/IR3629A MPbF
Programming the Current-Limit
The Current-Limit threshold can be set by
connecting a resistor (R SET ) from the drain of the
low-side MOSFET to the OCSet pin. The
resistor can be calculated by using equation (3).
The R DS(on) has a positive temperature
coefficient and it should be considered for the
worst case operation. This resistor must be
placed close to the IC, place a small ceramic
capacitor from this pin to ground for noise
rejection purposes.
Layout Consideration
The layout is very important when designing high
frequency switching converters. Poor layout will
affect noise pickup and can cause a good design
to perform with less than expected results.
Start to place the power components, making all
the connection in the top layer with wide, copper
filled areas. The inductor, output capacitors and
the MOSFETS should be as close to each other
as possible. This helps to reduce the EMI
radiated by the power traces due to the high
switching currents through them. Place input
I SET = I L ( critical ) =
R OCSet ? I OCSet
R DS ( on )
--( 3 )
capacitor very close to the drain of the high-side
MOSFET, to reduce the ESR replace the single
input capacitor with two parallel units.
R DS ( on ) = 1 . 3 m Ω * 1 . 5 = 1 . 95 m Ω
I SET ? I o ( LIM ) = 25 A * 1 . 5 = 37 . 5 A
(50% over nominal output current)
R OCSet = 3 . 65 K Ω Select R 7 = 3 . 65 K Ω
Setting the Power Good Threshold
Power Good threshold can be programmed by
using two external resistors (R1, R2 in figure 16).
The following formulas can be used to set the
threshold:
The feedback part of the system should be kept
away from the inductor and other noise sources.
The critical bypass components such as
capacitors for Vcc and Vc should be close to the
respective pins. It is important to place the
feedback components including feedback
resistors and compensation components close to
Fb and Comp pins.
In a multilayer PCB use one layer as a power
ground plane and have a control circuit ground
(analog ground), to which all signals are
referenced. The goal is to localize the high
current path to a separate loop that does not
interfere with the more sensitive analog control
R 2 =
0 . 38 V
0 . 9 *V out ? 0 . 38 V
*R 1
--( 18 )
function. These two grounds must be connected
together on the PC board layout at a single point.
The MLPD is a thermally enhanced package.
Where;
0.38V is reference of the internal comparator
0.9*Vout is selectable threshold for power good,
for this design it is 1.62V.
Select R 1 =10KOhm
Using (18): R 2 =3.06KOhm
Select R 2 =3.09K
Use a pull up resistor (4.99K) from PGood pin to
Vcc.
11/29/2007
Based on thermal performance it is
recommended to use 4-layers PCB. To
effectively remove heat from the device the
exposed pad should be connected to ground
plane using vias.
17
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| IR3629MPBF | 功能描述:IC CTLR PWM BUCK SYNC 12-MLPD RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| IR3629MTRPBF | 功能描述:电压模式 PWM 控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 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 |
| IR3637ASPBF | 功能描述:IC REG CTRLR BUCK PWM VM 8-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) |
| IR3637ASTRPBF | 功能描述:开关变换器、稳压器与控制器 High Volt Sych PWM 600kHz 5V PWM 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 |
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