MIC3263 datasheet(27/32 Pages) MICREL

Part #	MIC3263

Description	Six-Channel WLED Driver for Backlighting Applications with Flicker-Free Dimming

PDF	32 Pages

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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27 / 32 page

Micrel, Inc.

MIC3263

January 2010

M9999-012110

he b

shee

SNUBBER ≈ 2Ω ½ W and CSNUBBER ≈ 470pF to 100

a snubber is used, the power dissipation in the R

is:

SNUBBER

OUT

PSNUBBER = 470pF × 34V

2 × 1MHz = 0.54W

Tabl

e powe

s in the Design

Exam

The explanation of the method to find t

snubber is beyond the scope of this data

est R

t. Use

0pF. If

SNUBBER

= C

× V

2 × F

e 2 illustrates th

r losse

ple.

Description

Value

Power Loss in the L

0.069W

iode

ower Loss in the Schottky D

0.09W

MIC3263 Power Loss

1.46W

Maximum Total Losses

1.62W

Minimum Efficiency

80%

Table 2. Major Power Losses

ge that the OVP will trigger is set

according to Equation 19. Using the values for this

example gives a max output voltage of:

RSLP

To find RSLP use Equation 1 (which is repeated here):

Use the minimum VIN and the maximum VOUT.

OVP

The output volta

Equation 19:

VOVP= 2.4× (R2+R2)/R1=40V

OUT(MAX)

IN(MIN)

V- L × F

RSLP =

-6

8.64 × 10

× V

In this example:

34 - 22μH × 1Mhz

RSLP =

= 174kΩ

-6

8.64 ×10

× 8

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