LM3423MHBKBSTEV/NOPB National Semiconductor, LM3423MHBKBSTEV/NOPB Datasheet - Page 29

• Manufacturer Part Number: LM3423MHBKBSTEV/NOPB
• Description: BOARD EVAL BUCK BOOST LM3423
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM3423MHBKBSTEV/NOPB

• Current - Output / Channel: 1A
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 35V
• Features: Dimmable
• Voltage - Input: 4.5 ~ 35V
• Utilized Ic / Part: LM3423
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM3423MHBKBSTEV

1. OPERATING POINT
Solve for V
Solve for D, D', D
2. SWITCHING FREQUENCY
Assume C
The closest standard resistor is 49.9 kΩ therefore f
The chosen component from step 2 is:
3. AVERAGE LED CURRENT
Solve for R
Assume R
The closest standard resistor for R
R
The chosen components from step 3 are:
HSP
is actually 1 kΩ therefore I
T
CSH
O
SNS
= 1 nF and solve for R
and r
:
= 12.4 kΩ and solve for R
MAX
D
:
, and D
MIN
:
LED
SNS
T
:
is:
is actually 0.1Ω and for
HSP
:
SW
is:
29
4. INDUCTOR RIPPLE CURRENT
Solve for L1:
The closest standard inductor is 33 µH therefore Δi
Determine minimum allowable RMS current rating:
The chosen component from step 4 is:
5. OUTPUT CAPACITANCE
Solve for C
The closest capacitance totals 40 µF therefore Δi
Determine minimum allowable RMS current rating:
The chosen components from step 5 are:
O
:
www.national.com
LED-PP
L-PP
is:
is: