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參數資料
| 型號： | AN-14 |
| 英文描述： | TOPSwitch Tips. Techniques & Troubleshooting Guide |
| 中文描述： | TOPSwitch的提示。技術 |
| 文件頁數： | 11/28頁 |
| 文件大?。?/td> | 246K |
| 代理商： | AN-14 |
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AN-14
11
4. PC Layout
4.1 Single Point Ground/Kelvin Source Pin Connections
Figure 4 shows how auto-restart/compensation capacitor C5
must be connected to the Source pin using a single point ground
or Kelvin connection. Proper layout prevents shutdown at turn
on or instability due to high Source pin switching currents. High
voltage return to input capacitor C1 must be connected directly
to the Source pad with a separate trace
and must not share the
Figure 4. Recommended TOPSwitch Layout.
C5 trace
. Bias/feedback return should also be connected
directly to the Source pad with a separate trace as shown.
The Source pin must be kept as short as possible
.
Do not
bend or extend the Source pin
. Insert
TOPSwitch
fully into
the PC board as shown. Extend and bend the Drain pin if
additional creepage distance on the PC board is necessary.
4.2 Ideal Component Placement
Figure 5 shows ideal component placement and single sided
PC trace connections for all critical power and EMI components
with the ST204A schematic (Figure 3) used for reference.
PI-1697-120195
PC Board
Kelvin-connected
bypass capacitor
and/or compensation network
Bias/Feedback Input
Bias/Feedback Return
High-voltage Return
Bend DRAIN pin
forward if needed
for creepage
D
S
C
Do not bend SOURCE pin
Keep it short
High Voltage
Return
Bias Winding
Return
Bypass
Capacitor
D
S
C
TOP VIEW
Bias/Feedback
Input
C5
To C1
Insert fully into PC board
A checklist is provided on the next page which is useful for
uncovering potential PC layout related problems in any
TOPSwitch
power supply.
Figure 5. Ideal Placement for Critical Components.
+
-
PI-1334-012695
-
C1
C
R
U
C
C
T1
L1
C
D
C7
Y1
+
-
+
-
+
-
Output
Connector
V
D2
U
+
{
Loop Length
Not Critical
Jumper
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PDF描述 |
|---|---|
| AN-21 | TOPSwitch-II Flyback Quick Selection Curves |
| AN-26 | TOPSwitch-FX Flyback Quick Selection Curves |
| AN-35 | LinkSwitch Design Guide |
| AN002M4-78 | SP4T RF Absorptive Switch |
| AN002R2-29 | SPDT RF Reflective Switch |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AN1405D | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:3.3V / 5V ECL 2-Input Differential XOR/XNOR |
| AN1406 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:DESIGNING WITH PECL (ECL AT + 5.0) |
| AN1406/D | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:DESIGNING WITH PECL (ECL AT + 5.0) |
| AN1406D | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:3.3V / 5V ECL 2-Input Differential XOR/XNOR |
| AN14-17A | 制造商:AN# - MILITARY 功能描述: |
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