LED5000 datasheet(32/52 Pages) STMICROELECTRONICS

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Application notes - buck conversion

LED5000

32/51

Doc ID 023951 Rev 1

Equation 49

R1 must be dimensioned to limit the D1 rated power so it is an inexpensive small signal

Zener diode.

The overvoltage limits the output voltage in case of LED disconnection so protecting LEDs

when the string is reconnected with the device enabled. In case the OVP is not

implemented, a large amount of non-controlled current could flow through the LEDs during

the output capacitor discharging phase, thereby damaging the devices.

Table 9.

Component list

Reference

Part number

Description

Manufacturer

C1,C2

C3225X7S1H106M

μF 50 V (size 1210)

TDK

C3,C6

100 nF 50 V (size 0805)

470 pF 50 V (size 00603)

22 pF 50 V (size 0603)

C3216X7R1H105K

μF 50 V (size 1206)

TDK

Not mounted

STPS3L60U

3 A 60 V

BZX384-C4V7

BZX384-C39

MSS7341-473MLD

μH

ISAT=1.0 A (30% drop)

IRMS=1.85 A (40 ° C rise)

(size 7.3 x 7.3 x 4.1 mm)

Coilcraft

ERJ14BSFR27U

0.27

Ω 1%

(size 1206)

Panasonic

10 k

Ω 1% (size 0603)

Not mounted

24.9 k

Ω 1% (size 0603)

47 k

Ω 1% (size 0603)

OUT

ZENER_DIODE

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