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LCS705HG Datasheet(PDF) 9 Page - Power Integrations, Inc. |
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LCS705HG Datasheet(HTML) 9 Page - Power Integrations, Inc. |
9 / 26 page Rev. B 062011 9 LCS700-708 www.powerint.com Bootstrap Circuit and HB Node Layout Please refer to Figure 10. Note the location of the bootstrap diode, capacitor, resistor, and the HB trace routing. The objective is to keep them away from the small signal components and traces, such as the feedback optocoupler. Do not unnecessarily increase the area of the PCB traces on this node, because it will increase the dv/dt (capacitive) coupling to low-voltage circuits. Heat Sink Grounding The exposed metal in the back of the HiperLCS package is internally connected to the GROUND pin. If the HiperLCS has a dedicated heat sink and there is no electrical insulator between the device and the heat sink, the heat sink should be floating and not electrically connected anywhere else. If the heat sink is shared with other devices in the system, and the heat sink requires grounding to minimize EMI, a thin insulator is strongly recommended under the HiperLCS, for improved noise, surge, and system-level ESD immunity. The resulting increase in thermal resistance must be considered in the thermal design. Transformer Secondary The transformer secondary pins, output diodes, and main output capacitors should be positioned close together and routed with short thick traces. This is critical for secondary current symmetry and to minimize output diode inverse voltage stress. The use of ceramic capacitors allows placement between the transformer secondary pins and the output rectifier, producing a very tight layout. See Figure 11. The secondary winding halves should be inter-twined together before they are wound on the bobbin. This minimizes the leakage inductance between them and greatly improves current symmetry and minimizes output diode inverse voltage stress. For a 2-output design the half-windings of a given output need to be intertwined. Figure 9. Placement of B+ and B- High-Voltage Bypass Capacitors. SOURCE DRAIN |
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