LM3429MHX National Semiconductor, LM3429MHX Datasheet - Page 23
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LM3429MHX
Manufacturer Part Number
LM3429MHX
Description
LM3429 N-Channel Controller for Constant Current LED Drivers; Package: TSSOP EXP PAD; No of Pins: 14; Qty per Container: 2500/Reel
Manufacturer
National Semiconductor
Datasheet
1.LM3429MHX.pdf
(34 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LM3429MHX/NOPB
Manufacturer:
NS/TI
Quantity:
360
Part Number:
LM3429MHX/NOPB
Manufacturer:
TI/德州仪器
Quantity:
20 000
3. AVERAGE LED CURRENT
Solve for R
Assume R
The closest standard resistor for R
R
The chosen components from step 3 are:
4. INDUCTOR RIPPLE CURRENT
Solve for L1:
The closest standard inductor is 33 µH therefore the actual
Δi
Determine minimum allowable RMS current rating:
The chosen component from step 4 is:
HSP
L-PP
is actually 1 kΩ therefore I
is:
CSH
SNS
:
= 12.4 kΩ and solve for R
LED
SNS
is:
is actually 0.1Ω and for
HSP
:
23
5. OUTPUT CAPACITANCE
Solve for C
The closest standard capacitor is 6.8 µF therefore the actual
Δi
Determine minimum allowable RMS current rating:
The chosen components from step 5 are:
6. PEAK CURRENT LIMIT
Solve for R
The closest standard resistor is 0.04 Ω therefore I
The chosen component from step 6 is:
7. LOOP COMPENSATION
ω
ω
P1
Z1
LED-PP
is approximated:
is approximated:
is:
O
LIM
:
:
www.national.com
LIM
is: