LM3429_14 Datasheet, PDF (35/50 Pages) Texas Instruments – LM3429Q1 N-Channel Controller for Constant Current LED Drivers

LM3429
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Solve for R_OV1:
R_OV1 =
1.24Vx R_OV2
V_TURN-OFF - 0.62V
=
1.24V x 499 k:
40V - 0.62V
= 15.7 k:
The closest standard resistor is 15.8 kΩ making V_TURN-OFF:
1.24V x (0.5 x R_OV1 + R_OV2)
V_TURN-OFF =
R_OV1
V_TURN-OFF
=
1.24V
x
(0.5 x 15.8 k:
15.8 k:
+
499
k:)
=
39.8V
The chosen components from step 12 are:
R_OV1 = 15.8 k:
R_OV2 = 499 k:
SNVS616F – APRIL 2009 – REVISED JANUARY 2010
(139)
(140)
(141)
Design #1 Bill of Materials
Qty
Part ID
Part Value
Manufacturer Part Number
1
LM3429
Boost controller
NSC
LM3429MH
1
C_CMP
0.22 µF X7R 10% 25V
MURATA
GRM21BR71E224KA01L
1
C_F
2.2 µF X7R 10% 16V
MURATA
GRM21BR71C225KA12L
1
C_FS
0.1 µF X7R 10% 25V
MURATA
GRM21BR71E104KA01L
3
C_IN
4.7 µF X7R 10% 100V
TDK
C5750X7R2A475K
1
C_O
6.8 µF X7R 10% 50V
TDK
C4532X7R1H685K
1
C_OV
47 pF COG/NPO 5% 50V
AVX
08055A470JAT2A
1
C_T
1000 pF COG/NPO 5% 50V MURATA
GRM2165C1H102JA01D
1
D1
Schottky 100V 12A
VISHAY
12CWQ10FNPBF
1
L1
33 µH 20% 6.3A
COILCRAFT
MSS1278-333MLB
1
Q1
NMOS 100V 32A
FAIRCHILD
FDD3682
1
Q2
PNP 150V 600 mA
FAIRCHILD
MMBT5401
1
R_CSH
12.4 kΩ 1%
VISHAY
CRCW080512K4FKEA
1
R_FS
10Ω 1%
VISHAY
CRCW080510R0FKEA
2
R_HSP, R_HSN
1.0kΩ 1%
VISHAY
CRCW08051K00FKEA
1
R_LIM
0.04Ω 1% 1W
VISHAY
WSL2512R0400FEA
1
R_OV1
15.8 kΩ 1%
VISHAY
CRCW080515K8FKEA
1
R_OV2
499 kΩ 1%
VISHAY
CRCW0805499KFKEA
1
R_SNS
0.1Ω 1% 1W
VISHAY
WSL2512R1000FEA
1
R_T
35.7 kΩ 1%
VISHAY
CRCW080535K7FKEA
1
R_UV1
21 kΩ 1%
VISHAY
CRCW080521K0FKEA
1
R_UV2
150 kΩ 1%
VISHAY
CRCW0805150KFKEA
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