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參數(shù)資料
| 型號： | M30218MC-AXXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | PLASTIC, QFP-100 |
| 文件頁數(shù)： | 9/19頁 |
| 文件大?。?/td> | 2576K |
| 代理商： | M30218MC-AXXXFP |
F
S
Q0
765RS
—
Green-Mo
de
F
airchild
P
o
wer
Sw
itch
(FPS)
for
Qu
asi-Re
sonant
Operation
2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSQ0765RS Rev. 1.0.0
17
PCB Layout Guide
Due to the combined scheme, FPS shows better noise
immunity than a conventional PWM controller and
MOSFET discrete solution. Furthermore, internal drain
current sense eliminates noise generation caused by a
sensing resistor. There are some recommendations for
PCB layout to enhance noise immunity and suppress the
noise inevitable in power-handling components.
There are typically two grounds in the conventional
SMPS: power ground and signal ground. The power
power, while the signal ground is the ground for PWM
controller. In FPS, those two grounds share the same
pin, GND. Normally the separate grounds do not share
the same trace and meet only at one point, the GND pin.
Moreover, wider patterns for both grounds decrease
resistance for large currents.
Capacitors at the VCC and FB pins should be as close as
possible to the corresponding pins to avoid noise from
the switching device. Sometimes Mylar or ceramic
capacitors with electrolytic for VCC are better for smooth
operation. The ground of these capacitors needs to
connect to the signal ground (not power ground).
The cathode of the snubber diode should be close to the
drain pin to minimize stray inductance. The Y-capacitor
between primary and secondary should be directly
connected to the power ground of DC link to maximize
surge immunity.
Because the voltage range of feedback and sync line is
small, it is affected by the noise of the drain pin. Those
traces should not draw across or close to the drain line.
When the heat sink is connected to the ground, it should
be connected to the power ground. If possible, avoid
using jumper wires for power ground and drain.
Mylar is a registered trademark of DuPont Teijin Films.
Figure 36. Recommended PCB Layout
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| M3021E8F2-AXXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
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