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SC2612ESTRT 参数 Datasheet PDF下载

SC2612ESTRT图片预览
型号: SC2612ESTRT
PDF下载: 下载PDF文件 查看货源
内容描述: 为500kHz降压型DC / DC转换器 [500kHz Step-Down DC/DC Converter]
分类和应用: 转换器稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
文件页数/大小: 11 页 / 212 K
品牌: SEMTECH [ SEMTECH CORPORATION ]
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SC2612E
POWER MANAGEMENT
Layout Guidelines
Careful attention to layout requirements are necessary
for successful implementation of the SC2612E PWM con-
troller. High currents switching at high frequency are
present in the application and their effect on ground plane
voltage differentials must be understood and minimized.
1). The high power parts of the circuit should be laid out
first. A ground plane should be used, the number and
position of ground plane interruptions should be such as
to not unnecessarily compromise ground plane integrity.
Isolated or semi-isolated areas of the ground plane may
be deliberately introduced to constrain ground currents
to particular areas, for example the input capacitor and
bottom FET ground.
2). The loop formed by the Input Capacitor(s) (Cin), the
Top FET (Q1) and the Bottom FET (Q2) must be kept as
small as possible. This loop contains all the high current,
fast transition switching. Connections should be as wide
and as short as possible to minimize loop inductance.
Minimizing this loop area will a) reduce EMI, b) lower
ground injection currents, resulting in electrically “cleaner”
grounds for the rest of the system and c) minimize source
ringing, resulting in more reliable gate switching signals.
3). The connection between the junction of Q1, Q2 and
the output inductor should be a wide trace or copper
region. It should be as short as practical. Since this con-
nection has fast voltage transitions, keeping this con-
nection short will minimize EMI. The connection between
the output inductor and the output capacitors should be
a wide trace or copper area, there are no fast voltage or
current transitions in this connection and length is not
so important, however adding unnecessary impedance
will reduce efficiency.
12V IN
Vin
10
U1
2
7
8
0.1uF
4
VCC
COMP
SS/EN
GND
BST
DH
DL
FB
3
1
Q2
Cin
L
Cout
Vout
6
5
Q1
10uF
SC2612E
GND
2004 Semtech Corp.
8
www.semtech.com