LM3409MY-NOPB Datasheet, PDF (31/43 Pages) Texas Instruments – PFET Buck Controller for High Power LED Drivers

LM3409, LM3409HV, LM3409-Q1
www.ti.com
The closest 1% tolerance resistor is 6.98 kΩ therefore V_TURN-ON is:
( ) _VTURN-ON
=
1.24V x
R_UV1 + R_UV2
R_UV1
1.24V x (6.98 k: + 49.9 k:)
V_{TURN-ON =}
6.98 k:
= ^10.1V
The chosen components from step 8 are:
R_UV1 = 6.98k:
R_UV2 = 49.9 k:
SNVS602J – MARCH 2009 – REVISED MAY 2013
(107)
(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
1
LM3409/LM3409Q
2
C_IN1
1
C_F
1
C_F2
1
C_OFF
1
C_O
1
Q1
1
D1
1
L1
1
R_F2
1
R_OFF
1
R_UV1
1
R_UV2
1
R_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
Manufacturer
TI
MURATA
TDK
TDK
TDK
MURATA
ZETEX
COMCHIP
TDK
VISHAY
VISHAY
VISHAY
VISHAY
VISHAY
Part Number
LM3409MY/LM3409QMY
GRM55ER71H475MA01L
C1608X7R1C105K
C1608X7R1C104K
C1608X7R1H471K
GRM43ER71H225MA01L
ZXMP7A17KTC
CDBC560-G
SLF12575T-220M4R0
CRCW06031K00FKEA
CRCW060315K4FKEA
CRCW06036K98FKEA
CRCW060349K9FKEA
WSL2512R2000FEA
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