LM3429BKBSTEVAL National Semiconductor, LM3429BKBSTEVAL Datasheet - Page 22
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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
Design Example #1
BUCK-BOOST APPLICATION - 6 LEDs at 1A
SPECIFICATIONS
N = 6
V
r
V
V
V
f
V
I
Δi
Δi
Δv
I
V
V
V
V
1. OPERATING POINT
Solve for V
SW
LED
LIM
LED
LED
IN
IN-MIN
IN-MAX
SNS
TURN-ON
HYS
TURN-OFF
HYSO
L-PP
LED-PP
IN-PP
= 24V
= 700 kHz
= 6A
= 1A
= 325 mΩ
= 3.5V
= 100 mV
= 3V
= 500 mA
= 10V
= 10V
= 1V
= 70V
= 50 mA
= 10V
= 40V
O
and r
D
:
22
Solve for D, D', D
2. SWITCHING FREQUENCY
Assume C
The closest standard resistor is actually 35.7 kΩ therefore the
f
The chosen components from step 2 are:
SW
is:
T
= 1 nF and solve for R
MAX
, and D
MIN
:
T
:
300944i1