LM3429BKBSTEVAL National Semiconductor, LM3429BKBSTEVAL Datasheet - Page 24
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LM3429BKBSTEVAL
Manufacturer Part Number
LM3429BKBSTEVAL
Description
BOARD, EVALUATION, FOR LM3429
Manufacturer
National Semiconductor
Datasheet
1.LM3429MHNOPB.pdf
(34 pages)
Specifications of LM3429BKBSTEVAL
Kit Contents
LM3429 Assembled Evaluation Board, Application Note, LM3429 Datasheet
Svhc
No SVHC (15-Dec-2010)
Kit Features
Drives 4 To 8 LED At Max Average LED Current 1A, Overvoltage Protection,
www.national.com
T
To ensure stability, calculate ω
Solve for C
To attenuate switching noise, calculate ω
Assume R
The chosen components from step 7 are:
8. INPUT CAPACITANCE
Solve for the minimum C
To minimize power supply interaction a 200% larger capaci-
tance of approximately 14 µF is used, therefore the actual
Δv
selection is limited, three 4.7 µF X7R capacitors are chosen.
Determine minimum allowable RMS current rating:
The chosen components from step 8 are:
U0
IN-PP
is approximated:
is much lower. Since high voltage ceramic capacitor
FS
CMP
= 10Ω and solve for C
:
IN
:
P2
:
FS
:
P3
:
24
9. NFET
Determine minimum Q1 voltage rating and current rating:
A 100V NFET is chosen with a current rating of 32A due to
the low R
The chosen component from step 9 is:
10. DIODE
Determine minimum D1 voltage rating and current rating:
A 100V diode is chosen with a current rating of 12A and V
600 mV. Determine P
The chosen component from step 10 is:
11. INPUT UVLO
Solve for R
The closest standard resistor is 150 kΩ therefore V
Solve for R
DS-ON
UV2
UV1
:
:
= 50 mΩ. Determine I
D
:
T-RMS
and P
T
:
HYS
is:
D
=