Datasheet

IADJ
EN
CSN
LM3409
UVLO
V
IN
= 24V
I
LED
= 1A
VCC
COFF
GND
CSP
C
F
R
OFF
PGATE
C
OFF
R
UV2
R
UV1
DAP
VIN
V
O
= 14V
R
SNS
1
2
3
4
5 6
7
8
9
10
V
ADJ
C
IN1
C
O
D1
L1
Q1
R
F2
C
F2
LM3409, LM3409HV, LM3409-Q1
www.ti.com SNVS602J –MARCH 2009–REVISED MAY 2013
Design #1 Bill of Materials
Qty Part ID Part Value Manufacturer Part Number
1 LM3409HV/LM3409QHV Buck controller TI LM3409HVMY/LM3409QHVMY
2 C
IN1
, C
IN2
2.2µF X7R 10% 100V MURATA GRM43ER72A225KA01L
1 C
F
1.0µF X7R 10% 16V TDK C1608X7R1C105K
1 C
OFF
470pF X7R 10% 50V TDK C1608X7R1H471K
1 Q1 PMOS 100V 3.8A ZETEX ZXMP10A18KTC
1 D1 Schottky 100V 3A VISHAY SS3H10-E3/57T
1 L1 15 µH 20% 4.2A TDK SLF12565T-150M4R2
1 R
OFF
24.9kΩ 1% VISHAY CRCW060324K9FKEA
1 R
UV1
6.98kΩ 1% VISHAY CRCW06036K98FKEA
1 R
UV2
49.9kΩ 1% VISHAY CRCW060349K9FKEA
1 R
SNS
0.1Ω 1% 1W VISHAY WSL2512R1000FEA
Design Example #2
ANALOG DIMMING APPLICATION FOR 4 LEDS
SPECIFICATIONS
f
SW
= 500kHz
V
IN
= 24V; V
IN-MAX
= 42V
V
O
= 14V
I
LED
= 1A
Δi
L-PP
= 450mA; Δi
LED-PP
= 50mA
Δv
IN-PP
= 1V
V
TURN-ON
= 10V; V
HYS
= 1.1V
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