Datasheet

:
=
:
=
k9.49R
k98.6R
2UV
1UV
=
V1.10
k98.6 :
( )k9.49k98.6V24.1 :+:x
V
ONTURN
=
-
V
ONTURN
=
-
V24.1 ( )RR
2UV1UV
+x
R
1UV
LM3409, LM3409HV, LM3409-Q1
www.ti.com SNVS602J –MARCH 2009–REVISED MAY 2013
The closest 1% tolerance resistor is 6.98 kΩ therefore V
TURN-ON
is:
(107)
The chosen components from step 8 are:
(108)
9. IADJ CONNECTION METHOD
The IADJ pin is connected to an external voltage source and varied from 0 – 1.24V to dim. An RC filter (R
F2
= 1
kΩ and C
F2
= 0.1µF) is used as recommended.
10. PWM DIMMING METHOD
No PWM dimming is necessary.
Design #2 Bill of Materials
Qty Part ID Part Value Manufacturer Part Number
1 LM3409/LM3409Q Buck controller TI LM3409MY/LM3409QMY
2 C
IN1
4.7µF X7R 10% 50V MURATA GRM55ER71H475MA01L
1 C
F
1.0µF X7R 10% 16V TDK C1608X7R1C105K
1 C
F2
0.1µF X7R 10% 16V TDK C1608X7R1C104K
1 C
OFF
470pF X7R 10% 50V TDK C1608X7R1H471K
1 C
O
2.2µF X7R 10% 50V MURATA GRM43ER71H225MA01L
1 Q1 PMOS 70V 5.7A ZETEX ZXMP7A17KTC
1 D1 Schottky 60V 5A COMCHIP CDBC560-G
1 L1 22 µH 20% 4.2A TDK SLF12575T-220M4R0
1 R
F2
1.0kΩ 1% VISHAY CRCW06031K00FKEA
1 R
OFF
15.4kΩ 1% VISHAY CRCW060315K4FKEA
1 R
UV1
6.98kΩ 1% VISHAY CRCW06036K98FKEA
1 R
UV2
49.9kΩ 1% VISHAY CRCW060349K9FKEA
1 R
SNS
0.2Ω 1% 1W VISHAY WSL2512R2000FEA
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