AS3820 datasheet(8/52 Pages) DIALOG

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AS3820

16-Channel White LED Controller for LCD Backlight

Rev. 1.1

Datasheet

www.dialog-semiconductor.com

8 of 52

05-Feb-2019

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Current Outputs (cont’d)

LED Current Accuracy Over VDAC

I800_ALL

DACref = 800mV,

VDAC = 200mV - 800mV,

TJ = 25°C

(excluding error of external Rset)

-1.5

+1.5

LED Current Accuracy Over VDAC and

Temperature

I800_TEMP

DACref = 800mV,

VDAC = 200mV - 800mV,

TJ = -20°C to 115°C

(excluding error of external Rset)

-2

Output current pin Gx

IGX

Output resistor pin Gx

RGX

1.0

1.3

Output voltage pin Gx

Vgx

Igx = 0mA

VDD

Feedback Circuit, Fault Detectors

Feedback Current Maximum

IFBMAX

VFB_X > 0.25V

255

Step Size of FB Counter (LSB)

FB_IDAC_LSB

Overtemperature Limit

TOVTEMP

130

140

150

°C

Overtemperature Hysteresis

THYST

°C

Minimum Time to Detect Short

tSHORT_MIN

300

PWM Generators

Internal Clock for PWM

fOSC

400

500

600

kHz

HSYNC Frequency

fHSYNC

100

2000

kHz

VSYNC Frequency

fVSYNC

480

Digital Pins

High Level Input Voltage

VIH

1.3

V3_2

+ 0.3

Low Level Input Voltage

VIL

-0.3

0.8

High Level Output Voltage

VOH

I = 2mA

V3_2

- 0.3

Low Level Output Voltage

VOL

I = 2mA

0.3

Low Level Output Voltage Open Drain

Outputs

VOL_PD

I = 2mA

0.3

Input Resistance Pullup Inputs

R_PU

300

kΩ

Input Resistance Pulldown Inputs

R_PD

300

kΩ

VCC = 12V, -40°C ≤ TA ≤ 85°C, unless otherwise specified

Electrical Characteristics (cont.)

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