ADP5350ACBZ-1-R7 datasheet(32/63 Pages) AD

32 / 63 page

ADP5350

Data Sheet

Rev. B | Page 32 of 63

LEDs in Parallel

Different configurations, for example, LEDs in series or LEDs in

parallel, can be supported by ADP5350.

Figure 52. Thee LEDs in Parallel for Grouped Backlight and One LED Strip or

Indicator

Figure 52 shows three LEDs in parallel (15 mA each), in

grouped backlight configuration, connected to D1, D2, and D3,

and one additional LED indicator (2 mA) connected to D5.

1. Configure the boost regulator as follows:

a. Set BST_MODE = 0 to configure the boost regulator

in LED operation mode.

b. Set BST_BL = 0 to configure the boost regulator to

provide the bias voltage to all current sink channels.

c. Set BST_OVP = 1 to configure the boost OVP

threshold = 5.6 V.

2. Configure the grouped backlight as follows:

a. Set BL_LED2 = 1 and BL_LED3 = 1 to configure D1

to D3 as the grouped backlight.

b. Set IBL[5:0] = 15 mA for the LED grouped backlight

current.

c. Set the BL_FI and BL_FO code for the fade in and

fade out timer (if required).

d. Set FOVR = 1 to enable the fading overwritten feature

(if required).

3. Configure the individual current sink as follows:

a. Set ILED5 = 2 mA for the D5 sink current.

b. Set the LED5_ON and LED5_OFF code for the

blinking timer (if required).

4. Set EN_BL = 1 to enable the LED backlight.

5. Set EN_LED5 = 1 to enable the LED indicator.

Figure 53. Two LEDs in Parallel (30 mA each) for Grouped Backlight and One

LED Strip or Indicator (2 mA)

Figure 53 shows two LEDs in parallel (30 mA each), in grouped

backlight configuration, connected from D1 to D4, and one

additional LED indicator (2 mA) connected to D5.

1. Configure the boost regulator as follows:

a. Set BST_MODE = 0 to configure the boost regulator

in LED operation mode.

b. Set BST_BL = 0 to configure the boost regulator to

provide the bias voltage to all current sink channels.

c. Set BST_OVP = 1 to configure the boost OVP

threshold = 5.6 V. Set EN_BL bit = 1 to enable the

LED backlight.

2. Configure the grouped backlight as follows:

a. Set BL_LED2 = 1, BL_LED3 = 1, and BL_LED4 = 1 to

configure D1 to D4 as the grouped backlight.

b. Set IBL[5:0] = 15 mA for the LED grouped backlight

current (two channels in parallel with 30 mA for each

LED current).

c. Set the BL_FI and BL_FO code for the fade in and

fade out timer (if required).

d. Set FOVR = 1 to enable the fading overwritten feature

(if required).

3. Configure the individual current sink as follows:

a. Set ILED5 = 2 mA for the D5 sink current.

b. Set the LED5_ON and LED5_OFF code for the

blinking timer (if required).

4. Set EN_BL = 1 to enable the LED backlight.

5. Set EN_LED5 = 1 to enable the LED indicator.

FB4

C10

4.7µF

ADP5350

VOUT4 (UP TO 5.6V)

AGND

PGND4

VOUT4

BOOST

VISOS

4.7µH

4.7µF

SW4

BACKLIGHT

LED STRIP

OR INDICATOR

15mA

LED

DRIVER

15mA

2mA

FB4

C10

4.7µF

ADP5350

VOUT4 (UP TO 5.6V)

AGND

PGND4

VOUT4

BOOST

VISOS

4.7µH

4.7µF

SW4

BACKLIGHT

LED STRIP

OR INDICATOR

30mA

15mA

LED

DRIVER

15mA

30mA

2mA

15mA

ADP5350ACBZ-1-R7 Datenblatt(PDF) 32 Page - Analog Devices

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