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| 型号： | SP6121CN-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8NSOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 560kHz |
| 占空比： | 100% |
| 电源电压： | 3 V ~ 5.5 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 ~ 70°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
LAYOUT GUIDELINE
PCB layout plays a critical role in proper func-
tion of the converters and EMI control. In switch
mode power supplies, loops carrying high di/dt
give rise to EMI and ground bounces. The goal
of layout optimization is to identify these loops
and minimize them. It is also crucial on how to
connect the controller ground such that its op-
eration is not affected by noise. The following
guideline should be followed to ensure proper
operation.
1. A ground plane is recommended for minimiz-
ing noises, copper losses and maximizing heat
dissipation.
2. Begin the layout by placing the power compo-
nents first. Orient the power circuitry to achieve
a clean power flow path. If possible make all the
connections on one side of the PCB with wide,
copper filled areas.
3. Connect the ground of feedback divider and
compensation components directly to the GND
pin of the IC using a dedicated ground trace.
Then connect this pin as close as possible to the
ground of the output capacitor.
4. The V CC bypass capacitor should be right next
to the V CC and GND pins.
5. The trace connecting the feedback resistors to
the output should be short, direct and far away
from the switch node, and switching compo-
nents.
6. Minimize the trace between PDRV/NDRV
and the gates of the MOSFETs to reduce the
impedance driving the MOSFETs. This is espe-
cially important for the bottom MOSFET that
tends to turn on through its Miller capacitor
when the switch node swings high.
7. Minimize the loop composed of input capaci-
tors, top/bottom MOSFETs and Schottky diode.
This loop carries high di/dt current. Also in-
crease the trace width to reduce copper losses.
8. Maximize the trace width of the loop connect-
ing the inductor, output capacitors, Schottky
diode and bottom MOSFET.
9. I SET and I SENSE connections to Q1 for current
limiting must be make using Kelvin connec-
tions.
Date: 11/29/04
SP6121 Low Voltage, Synchronous Step Down PWM Controller
14
? Copyright 2004 Sipex Corporation
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| 2727-03J | INDUCTOR TOROID 15UH SHIELD RADL |
| SP6123ACN-L/TR | IC REG CTRLR BUCK PWM VM 8NSOIC |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6121EB | 功能描述:电压模式 PWM 控制器 Low Voltage, 8 Pin Sync Buck Controller 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 |
| SP6122 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Voltage, Micro 8, PFET, Buck Controller Ideal for 1A to 5A, Small Footprint, DC-DC Power Converters |
| SP6122_04 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Voltage, Micro 8, PFET, Buck Controller Ideal for 1A to 5A, Small Footprint, DC-DC Power Converters |
| SP6122ACU | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP6122ACU/TR | 制造商:Exar Corporation 功能描述: |
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