参数资料
型号: SC493ULTRT
厂商: Semtech
文件页数: 20/28页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM MLPQ-20
标准包装: 1
系列: EcoSpeed®, SmartDrive™
PWM 型: 控制器
输出数: 1
频率 - 最大: 1MHz
电源电压: 3 V ~ 5.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 20-MLPQ
包装: 标准包装
其它名称: SC493ULTRTDKR
SC493
Applications Information (continued)
Layout Guidelines
The switching converter can be an EMI source if the cir-
cuitry is not properly laid out on the PCB. The suggested
layout guidelines are shown in Figure 7. The following are
several simple rules that should be followed to prevent
EMI issues.
2. Both the high side loop and low side loop should use
short traces. The high side loop includes the input
capacitors, the high side MOSFET, the inductor, and the
output capacitors. The low side loop includes the low
side MOSFET, the inductor, and the output capacitors.
3. The LX trace should be short, since it is the main
noise source of the circuit. All sensitive analog signals
1.
The ground connection between the input capacitor,
the output capacitor, and the MOSFET ground should
use a short and wide trace. This can reduce the
resistive losses and high frequency ringing due to stray
should be routed away from the LX trace.
4. Standard techniques such as snubbers can also be
used to remove the high frequency ringing at the
phase node.
inductance.
COUT
CLDO3
VOUT
AGND
VOUT
FB
PGOOD
PVDD
RPGOOD
VDD
SDA
SCL
SC493
PGND
DL
NC
PGND
RILIM
CBST
LX
PGND
VIN
MOSFETs
CIN
Figure 7 — Suggested Layout Guidelines
20
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