LM3409EVAL National Semiconductor, LM3409EVAL Datasheet - Page 20

• 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

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8. INPUT UVLO
Solve for R
The closest 1% tolerance resistor is 49.9 kΩ therefore V
is:
Solve for R
Design #1 Bill of Materials
Qty
1
2
1
1
1
1
1
1
1
1
1
UV2
UV1
:
:
Part ID
LM3409HV/
LM3409QHV
C
C
C
Q1
D1
L1
R
R
R
R
IN1
F
OFF
OFF
UV1
UV2
SNS
, C
IN2
Part Value
Buck controller
2.2µF X7R 10% 100V
1.0µF X7R 10% 16V
470pF X7R 10% 50V
PMOS 100V 3.8A
Schottky 100V 3A
15 µH 20% 4.2A
24.9kΩ 1%
6.98kΩ 1%
49.9kΩ 1%
0.1Ω 1% 1W
HYS
20
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 left open forcing V
10. PWM DIMMING METHOD
PWM dimming signal pair is applied to the EN pin and GND
at f
is:
DIM
= 1 kHz.
Manufacturer
NSC
MURATA
TDK
TDK
ZETEX
VISHAY
TDK
VISHAY
VISHAY
VISHAY
VISHAY
ADJ
Part Number
LM3409HVMY/
LM3409QHVMY
GRM43ER72A225KA01
L
C1608X7R1C105K
C1608X7R1H471K
ZXMP10A18KTC
SS3H10-E3/57T
SLF12565T-150M4R2
CRCW060324K9FKEA
CRCW06036K98FKEA
CRCW060349K9FKEA
WSL2512R1000FEA
= 1.24V.
TURN-