LM3429MH National Semiconductor, LM3429MH Datasheet - Page 22
LM3429MH
Manufacturer Part Number
LM3429MH
Description
IC, LED DRIVER, CNTRL, 14TSSOP
Manufacturer
National Semiconductor
Datasheet
1.LM3429MHNOPB.pdf
(34 pages)
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
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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM3429MH
Manufacturer:
NS/国半
Quantity:
20 000
Company:
Part Number:
LM3429MHX/NOPB
Manufacturer:
NS/TI
Quantity:
360
Part Number:
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Manufacturer:
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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