LM3409HVEVAL National Semiconductor, LM3409HVEVAL Datasheet - Page 9

• Manufacturer Part Number: LM3409HVEVAL
• Description: BOARD EVALUATION FOR LM3409HV
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM3409HVEVAL

• Current - Output / Channel: 1.5A
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 42V
• Features: Dimmable
• Voltage - Input: 6 ~ 75 V
• Utilized Ic / Part: LM3409HV
• Kit Contents: Board, Datasheet
• Svhc: No SVHC (15-Dec-2010)
• Kit Features: Drives 12 LEDs At Maximum Average LED Current 1.5A From DC Input Voltage 48V
• Mcu Supported Families: LM3409HV
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Alternate Designs
Alternate designs with the LM3409HV evaluation board are
possible with very few changes to the existing hardware. The
evaluation board FETs and diodes are already rated higher
than necessary for design flexibility. The input UVLO can re-
main the same and the input capacitance is sufficient for most
designs, though the input voltage ripple will change. Other
designs can evaluated by changing R6, R9, L1, and C8.
Specification /
Component
Dimming Method
V
V
f
I
Δi
R6
R9
L1
C8
SW
LED
IN
O
LED
Design 1
PWM
24V
14V
500 kHz
1A
450 mA
15.4 kΩ
0.2Ω
22 µH
None
Design 2
PWM
36V
24V
450 kHz
700 mA
250 mA
25.5 kΩ
0.3Ω
68 µH
None
Design 3
Analog
48V
35V
300 kHz
2A
70 mA
46.4 kΩ
0.12Ω
150 µH
2.2 µF
9
The table below gives the main specifications for five different
designs and the corresponding values for R6, R9, L1 and C8.
The RMS current rating of L1 should be at least 50% higher
than the specified I
analog dimming range, while designs 1, 2, and 4 are opti-
mized for best PWM dimming range. These are just exam-
ples, however any combination of specifications can be
achieved by following the Design Procedure in the
LM3409/09HV datasheet.
Design 4
PWM
65V
56V
350 kHz
3A
1A
24.9 kΩ
0.07Ω
15 µH
None
LED
. Designs 3 and 5 are optimized for best
Design 5
Analog
75V
42V
300 kHz
1.5A
80 mA
95.3 kΩ
0.15Ω
330 µH
2.2 µF
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