- 您现在的位置：买卖IC网 > PDF目录17253 > IRDC3629 (International Rectifier)BOARD EVAL SYNC BUCK CONTROLLER PDF资料下载
参数资料
| 型号： | IRDC3629 |
| 厂商： | International Rectifier |
| 文件页数： | 17/23页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL SYNC BUCK CONTROLLER |
| 标准包装： | 1 |
| 系列： | * |
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
相关PDF资料 |
PDF描述 |
|---|---|
| CGRM4001-HF | RECTIFIER 50V 1A SOD-123 |
| HK1608R39J-T | INDUCTOR HI FREQ 390NH 5% 0603 |
| CBC2012T470K | INDUCTOR 47UH 10% 0805 SMD |
| HK16083N3S-T | INDUCTOR HI FREQ 3.3+/-0.3NH |
| CBC2012T220K | INDUCTOR 22UH 10% 0805 SMD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IRDC3629A | 功能描述:电源管理IC开发工具 IR3629A Eval BRD 300kHz Controller RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3637 | 功能描述:电源管理IC开发工具 250kHz to 9MHz IR350B Xphase IC RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3637EVAL | 制造商:IRF 制造商全称:International Rectifier 功能描述:IR3637 EVALUATION BOARD USER GUIDE |
| IRDC3640 | 功能描述:电源管理IC开发工具 IR3640 12V PWM 1.5MHz Controller RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3651 | 功能描述:电源管理IC开发工具 IR3651 EVAL BRD 400kHz RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
发布紧急采购，3分钟左右您将得到回复。