FAN5038 Datasheet, PDF (13/15 Pages) Fairchild Semiconductor – Dual Voltage Controller for DSP Power

FAN5038
PRODUCT SPECIFICATION
A 12V power supply is used to bias the VCCP. A 47Ω resis-
tor is used to limit the transient current into VCCP. A 1uF
capacitor filter is used to filter the VCCP supply and source
the transient current required to charge the MOSFET gate
capacitance. This method provides sufficiently high gate
bias voltage to the MOSFET (VGS), and therefore reduces
RDS(ON) of the MOSFET and its power loss.
Figure 4 provides about 5V of gate bias which works well
when using typical logic-level MOSFETs.
Layout Gerber File and Silk Screen
A reference design for motherboard implementation of the
FAN5038 along with the Layout Gerber File and the Silk
Screen is available. Please call Fairchild Electronics Semi-
conductor Division’s Marketing Departmentat to obtain this
information.
FAN5038 Evaluation Board
Fairchild Electronics Semiconductor Division provides an
evaluation board for verifying the system level performance
of the FAN5038. The evaluation board provides a guide as
to what can be expected in performance with the supplied
external components and PCB layout. Please call your local
Sales Office or Fairchild Electronics Semiconductor
Division for an evaluation board.
13
REV. 1.0.2 7/6/00