ADM8843EB-EVALZ Ver la hoja de datos (PDF) - Analog Devices

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ADM8843EB-EVALZ

Four White LED Backlight Driver

Analog Devices 

ADM8843

Data Sheet

USING SMALLER CAPACITOR VALUES

The ADM8843 can be operated with the smaller capacitor values described here to reduce capacitor footprint sizes.

Option 1

Option 2

Input and output ripple plots for 1× and 1.5× modes of operation

are shown with C1, C2 = 0.22 μF; C3 = 0.47 μF; and C4 = 1 μF.

Input and output ripple plots for 1× and 1.5× modes of operation

are shown with C1, C2 = 0.22 μF; C3 = 0.47 μF; and C4 = 4.7 μF.

VCC 2

VCC 2

VOUT 3

CH2 10.0mV BW M 400ns CH3

CH3 10.0mV BW

–33mV

Figure 26. 1× Mode Operation, Four LEDs with 20 mA/LED at VCC = 5.0 V,

with a 1 μF VCC Decoupling Capacitor

VOUT 3

CH2 10.0mV BW M 1.00s CH3

CH3 10.0mV

B

W

–33mV

Figure 28. 1× Mode Operation, Four LEDs with 20 mA/LED at VCC = 5.0 V,

with a 4.7 μF VCC Decoupling Capacitor

VCC 2

VCC 2

VOUT 3

CH2 20.0mV BW M 400ns CH3

CH3 50.0mV BW

–33mV

Figure 27. 1.5× Mode Operation, Four LEDs with 20 mA/LED at VCC = 3.6 V,

with a 1 μF VCC Decoupling Capacitor

VOUT 3

CH2 20.0mV BW M 400ns CH3

CH3 50.0mV BW

–33mV

Figure 29. 1.5× Mode Operation, Four LEDs with 20 mA/LED at VCC = 3.6 V,

with a 4.7 μF VCC Decoupling Capacitor

Rev. E | Page 14 of 16

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