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參數(shù)資料
| 型號(hào)： | AN-14 |
| 英文描述： | TOPSwitch Tips. Techniques & Troubleshooting Guide |
| 中文描述： | TOPSwitch的提示。技術(shù) |
| 文件頁數(shù)： | 12/28頁 |
| 文件大?。?/td> | 246K |
| 代理商： | AN-14 |
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AN-14
12
B
6/96
1)
TOPSwitch
(U1), C1, and Transformer T1 primary pins
should be very close together to minimize PC trace length
and loop area. The traces connecting these components
have fast switching currents which cause common mode
EMI emissions. Note
TOPSwitch
alignment and right
angle heat sink.
2) D1, VR1, and Transformer T1 primary pins should be
very close together to minimize PC trace length and loop
area. Traces connecting these components have fast
switching currents which cause common mode EMI
emissions.
3)
TOPSwitch
Drain connection to T1 primary pins and
clamp diode D1 must be very short because, in addition
to fast switching currents, this trace also has high switching
voltage which causes additional common mode EMI
emissions.
4)
TOPSwitch
Source pin should connect directly to C1
with no other traces connected to this trace segment.
5) Y1-capacitor C7 should connect directly to the transformer
T1 primary bias winding return and secondary output
winding return pins with short, wide traces.
6) Transformer T1 primary bias winding return should be
connected directly to
TOPSwitch
Source pin. No other
components should be connected to this trace segment
because lightning surge test voltages induce noise voltage
drops.
7) Bias diode D3 should be as close as possible to transformer
T1 bias winding pins. This placement minimizes anode
trace length (which has high switching voltages) and
maximizes length of the relatively quiet cathode trace.
8) Cathode of D3 should connect directly to C4. No other
components should be connected to this trace segment
because lightning surge voltages and rectification current
will induce noise voltage drops. C4 should then be
connected through a PC trace and top side wire jumper to
optocoupler U2.
9) Capacitor C4 should be connected directly to
TOPSwitch
Source pin with no other traces connected to this trace
segment. No other components should be connected to
this trace segment because lightning surge test voltages
will induce noise voltage drops.
10) Capacitor C5 should be connected directly to
TOPSwitch
Source pin with no other traces connected to this trace
segment. No other components should be connected to
this trace segment because lightning surge test voltages
will induce noise voltage drops.
11) Output rectifier D2, C2, and Transformer secondary pins
should be very close together to minimize PC trace length
and loop area. Traces connecting these components have
fast switching currents which cause common mode EMI
emissions. PC traces should be wide because peak
currents are much higher than DC load current.
12) C3 should be close to the output connector and directly
across the traces connecting to the output connector to
minimize output switching noise. Note that the PC traces
run right through the capacitor lead pads and that no
additional PC traces have been placed in series with C3.
Note also that PC traces in series with L1 and the PC trace
connecting C2 and C3 can be narrower and longer because
current flow is essentially DC.
13) Heat sinks should be either connected only to
TOPSwitch
tab or completely isolated from both
TOPSwitch
tab and
circuit. If the heat sink is connected elsewhere in circuit
but isolated from
TOPSwitch
tab, capacitance between
TOPSwitch
tab and heat sink can resonate with circuit
inductance causing high frequency ringing currents
which may trigger
TOPSwitch
shutdown latch.
4.3 PC Layout Checklist:
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| 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 |
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| 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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