LM3424 Datasheet, PDF(33/50 Page) National Semiconductor (TI) – Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs

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LM3424 Datasheet, PDF (33/50 Pages) National Semiconductor (TI) – Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs

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15. SOFT-START

Solve for tSU:

If tSU is less than tTSU, solve for tSU-SS-BASE:

Solve for CSS:

The chosen component from step 15 is:

DESIGN #1 Bill of Materials

Qty

Part ID

LM3424

CBYP

CCMP, CNTC

CFS

CIN

COV

CREF, CSS

RBIAS

RCSH

RFS

RGAIN

RHSP, RHSN

RLIM

ROV1

ROV2

RREF1, RREF2

RSLP

RSNS

RUV1

RUV2

NTC

Part Value

Boost controller

2.2 ÂµF X7R 10% 16V

0.33 ÂµF X7R 10% 25V

0.27 ÂµF X7R 10% 25V

4.7 ÂµF X7R 10% 100V

10 ÂµF X7R 10% 50V

47 pF COG/NPO 5% 50V

1 ÂµF X7R 10% 25V

Schottky 100V 12A

33 ÂµH 20% 6.3A

NMOS 100V 32A

PNP 150V 600 mA

24.3 kâ¦ 1%

12.4 kâ¦ 1%

10â¦ 1%

6.81 kâ¦ 1%

1.0 kâ¦ 1%

0.04â¦ 1% 1W

15.8 kâ¦ 1%

499 kâ¦ 1%

49.9 kâ¦ 1%

16.5 kâ¦ 1%

0.1â¦ 1% 1W

14.3 kâ¦ 1%

21 kâ¦ 1%

150 kâ¦ 1%

Thermistor 100 kâ¦ 5%

Manufacturer

NSC

MURATA

TDK

AVX

MURATA

VISHAY

COILCRAFT

FAIRCHILD

VISHAY

TDK

Part Number

LM3424MH

GRM21BR71C225KA12L

GRM21BR71E334KA01L

GRM21BR71E274KA01L

C5750X7R2A475K

C4532X7R1H106K

08055A470JAT2A

GRM21BR71E105KA01L

12CWQ10FNPBF

MSS1278-333MLB

FDD3682

MMBT5401

CRCW080524K3FKEA

CRCW080512K4FKEA

CRCW080510R0FKEA

CRCW08056K81FKEA

CRCW08051K00FKEA

WSL2512R0400FEA

CRCW080515K8FKEA

CRCW0805499KFKEA

CRCW080549K9FKEA

CRCW080516K5FKEA

WSL2512R1000FEA

CRCW080514K3FKEA

CRCW080521K0FKEA

CRCW0805150KFKEA

NTCG204H154J

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