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| 型號(hào)： | SSL4101DB01 |
| 廠商： | NXP Semiconductors N.V. |
| 中文描述： | Demoboard description Demobox content SSL4101DB01 Reference design, CD with documentation |
| 文件頁(yè)數(shù)： | 8/11頁(yè) |
| 文件大小： | 103K |
| 代理商： | SSL4101DB01 |
AN10580_1
NXP B.V. 2008. All rights reserved.
Application note
Rev. 01 — 19 March 2008
8 of 11
NXP Semiconductors
AN10580
GreenChip TEA1761 SR and feedback controller
shielding. The phase of the injected current is opposite to the phase of the common mode
current through the flyback transformer and will reduce the common mode current through
the input and output cables by compensation. The exact number of turns of the shield
winding should be determined experimentally. With the powered shield a significant
reduction of the Y-cap value and thus leakage current is possible. In some cases the
Y-capacitor even can be omitted.
5.2 The powered Y-cap
Figure 5
shows the powered Y-cap which is an alternative to the powered shield solution.
This solution needs an additional winding on the transformer and sometimes it also
requires an additional Y-cap, to meet the ESD surge and fast transient tests. The extra
winding at the primary side, injects current through a Y-cap into the secondary ground.
The phase of the injected current is opposite to the phase of the common mode current
through the flyback transformer and this will, by compensation, reduce the common mode
current through the input and output cables. The exact required number of turns in the
extra winding and the Y-cap value should be determined experimentally. Eight winding
turns and a Y-cap with a value of 100 pF would be recommended as a good starting point.
Fig 4.
Powered shield
TEA1761
secondary
ground
V DC
prim
primary
ground
sec
014aaa054
Y-cap
shield
V OUT
Fig 5.
Powered Y cap
TEA1761
secondary
ground
V DC
prim
primary
ground
sec
014aaa091
Y-cap 2
Y-cap 1
V OUT
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| SSTB | SURFACE MOUNT SUPER FAST RECTIFIERS |
| SSTD | SURFACE MOUNT SUPER FAST RECTIFIERS |
| SSTE | SURFACE MOUNT SUPER FAST RECTIFIERS |
| SSTG | SURFACE MOUNT SUPER FAST RECTIFIERS |
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