RDK-239 Power Integrations, Inc., RDK-239 Datasheet - Page 8

• Manufacturer Part Number: RDK-239
• Description: Specifications: Family: Eval Boards - DC/DC & AC/DC (Off-Line) SMPS ; Series: HiperLCS™ ; Main Purpose: DC/DC, Step Down ; Outputs and Type: 1, Isolated ; Power - Output: 150W ; Voltage - Output: 24V ; Current - Output: 6.25A ; Voltage - Input:
• Manufacturer: Power Integrations, Inc.

Rev. B 062011
Small Signal Bypass Capacitors
Please refer to Figure 5 Note the location of the small signal
bypass capacitors (highlighted) for the FEEDBACK, DT/BF, IS,
VREF, OV/UV and VCC pins, which allow short traces to their
pin connections and to the GROUND pin. Note that there is no
connection between the GROUND pin and the SOURCE pin or
the B- bus on the printed circuit board.
8
LCS700-708
Figure 7.
Figure 8.
Preferred Routing of Optocoupler and Traces to FEEDBACK Pin.
Placement of VCCH Capacitor.
VCCH Bypass Capacitor
Please refer to Figure 8. Note the location of the VCCH
capacitor (highlighted) which allows short connections to the
HB pin and the VCCH pin.
Drain to Source High-Voltage Bypass Capacitor
Please refer to Figure 9. Note the location of the B+ to B- high-
voltage bypass capacitors (highlighted) placed at the IC, minimizing
the PCB trace length to the D and S pins.
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