LM3409EVAL National Semiconductor, LM3409EVAL Datasheet - Page 23

• Manufacturer Part Number: LM3409EVAL
• Description: BOARD EVALUATION FOR LM3409
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM3409EVAL

• Current - Output / Channel: 1A
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 15V
• Features: Dimmable
• Voltage - Input: 6 ~ 42 V
• Utilized Ic / Part: LM3409
• Kit Contents: Board, Datasheet
• Svhc: No SVHC (15-Dec-2010)
• Kit Features: Drives 4 LEDs At Maximum Average LED Current 1A From DC Input Voltage 24V
• Mcu Supported Families: LM3409
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
LM3409/LM3409Q
:
:
Part ID
R
C
R
R
R
C
C
R
C
Q1
D1
C
L1
OFF
OFF
SNS
UV1
UV2
IN1
F2
F2
F
O
470pF X7R 10% 50V
4.7µF X7R 10% 50V
1.0µF X7R 10% 16V
0.1µF X7R 10% 16V
2.2µF X7R 10% 50V
Schottky 60V 5A
PMOS 70V 5.7A
22 µH 20% 4.2A
Buck controller
0.2Ω 1% 1W
15.4kΩ 1%
6.98kΩ 1%
49.9kΩ 1%
Part Value
1.0kΩ 1%
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
COMCHIP
MURATA
MURATA
VISHAY
VISHAY
VISHAY
VISHAY
VISHAY
ZETEX
NSC
TDK
TDK
TDK
TDK
GRM55ER71H475MA01L
GRM43ER71H225MA01L
LM3409MY/LM3409QMY
CRCW06031K00FKEA
CRCW060315K4FKEA
CRCW06036K98FKEA
CRCW060349K9FKEA
SLF12575T-220M4R0
WSL2512R2000FEA
C1608X7R1C105K
C1608X7R1C104K
C1608X7R1H471K
ZXMP7A17KTC
Part Number
CDBC560-G
F2
www.national.com
= 1 kΩ and
TURN-