Texas Instruments 36V, 2A PowerWise® Adjustable Frequency Synchronous Buck Regulator Evaluation Module LM20242EVAL/NOPB LM20242EVAL/NOPB Datenbogen
Produktcode
LM20242EVAL/NOPB
D =
V
OUT
V
IN
C
IN
VIN
SW
AGND
FB
PGOOD
V
OUT
R
FB1
R
FB2
C
OUT
EN
SS/TRK
VCC
C
VCC
C
C1
COMP
R
C1
V
IN
LM20242
RT
R
RT
BOOT
GND
L
C
SS
C
BOOT
D1
D2
SNVS534E – OCTOBER 2007 – REVISED MARCH 2013
DESIGN GUIDE
This section walks the designer through the steps necessary to select the external components to build a fully
functional power supply. As with any DC-DC converter numerous trade-offs are possible to optimize the design
for efficiency, size, or performance. These will be taken into account and highlighted throughout this discussion.
To facilitate component selection discussions the circuit shown in
functional power supply. As with any DC-DC converter numerous trade-offs are possible to optimize the design
for efficiency, size, or performance. These will be taken into account and highlighted throughout this discussion.
To facilitate component selection discussions the circuit shown in
below may be used as a reference.
Unless otherwise indicated all formulas assume units of amps (A) for current, farads (F) for capacitance, henries
(H) for inductance and volts (V) for voltages.
(H) for inductance and volts (V) for voltages.
Figure 9. Typical Application Circuit
The first equation to calculate for any buck converter is duty-cycle. Ignoring conduction losses associated with
the FETs and parasitic resistances it can be approximated by:
the FETs and parasitic resistances it can be approximated by:
(2)
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