LM3429MH National Semiconductor, LM3429MH Datasheet - Page 23

• Manufacturer Part Number: LM3429MH
• Description: IC, LED DRIVER, CNTRL, 14TSSOP
• Manufacturer: National Semiconductor

Specifications of LM3429MH

• Led Driver Application: Automotive, General Illumination
• No. Of Outputs: 1
• Output Current: 1A
• Input Voltage: 4.5V To 75V
• Dimming Control Type: Analogue / PWM
• Topology: Boost, Buck, Buck-Boost, SEPIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
:
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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: