LM3409HVMYX National Semiconductor, LM3409HVMYX Datasheet - Page 23

• Manufacturer Part Number: LM3409HVMYX
• Description: LM3409 LM3409HV PFET Buck Controller for High Power LED Drives; Package: MINI SOIC EXP PAD; No of Pins: 10; Qty per Container: 3500/Reel
• Manufacturer: National Semiconductor

8. INPUT UVLO
Solve for R
The closest 1% tolerance resistor is 49.9 kΩ therefore V
is:
Solve for R
Design #2 Bill of Materials
Qty
1
2
1
1
1
1
1
1
1
1
1
1
1
1
UV2
UV1
:
:
Part ID
LM3409
C
C
C
C
C
Q1
D1
L1
R
R
R
R
R
IN1
F
F2
OFF
O
F2
OFF
UV1
UV2
SNS
Part Value
Buck controller
4.7µF X7R 10% 50V
1.0µF X7R 10% 16V
0.1µF X7R 10% 16V
470pF X7R 10% 50V
2.2µF X7R 10% 50V
PMOS 70V 5.7A
Schottky 60V 5A
22 µH 20% 4.2A
1.0kΩ 1%
15.4kΩ 1%
6.98kΩ 1%
49.9kΩ 1%
0.2Ω 1% 1W
HYS
23
The closest 1% tolerance resistor is 6.98 kΩ therefore V
ON
The chosen components from step 8 are:
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
C
10. PWM DIMMING METHOD
No PWM dimming is necessary.
F2
is:
= 0.1µF) is used as recommended.
Manufacturer
NSC
MURATA
TDK
TDK
TDK
MURATA
ZETEX
COMCHIP
TDK
VISHAY
VISHAY
VISHAY
VISHAY
VISHAY
Part Number
LM3409MY
GRM55ER71H475MA0
1L
C1608X7R1C105K
C1608X7R1C104K
C1608X7R1H471K
GRM43ER71H225MA0
1L
ZXMP7A17KTC
CDBC560-G
SLF12575T-220M4R0
CRCW06031K00FKEA
CRCW060315K4FKEA
CRCW06036K98FKEA
CRCW060349K9FKEA
WSL2512R2000FEA
F2
www.national.com
= 1 kΩ and
TURN-