YB1303 datasheet(7/8 Pages) YOBON

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YB1303

Low Dropout LED Driver

YB1303 Rev.1.0

www.yobon.com.tw

Example 3:

Drive white, blue, red, amber LEDs

string

Assuming boost circuit, or existing voltage

bus, the YB1303 can be used to drive a

whole

string

LEDs

and

flexible

brightness control – whether using analog

or PWM (Notes).

-VDROP < 0.3V

-VIN_MIN = N×VF + VDROP

- VIN_MAX = N×VF + 6V

-VIN (@5mA typical) ~3.3V

Where VIN = Existing Bus / Boost Voltage

Key advantages:

No need for current matching resistors

and discrete transistor for brightness

control.

Notes:

1. Whether using analog or PWM signal, please

notice to avoid from exceeding the absolute

maximum rating claimed in this document.

2. EN must be turned on prior to VIN (delivered by

boost circuit or existing bus) and avoid from

VIN > 6V when EN is off.

LED Brightness Control

The YB1303 LED drivers feature analog

and PWM controls to give designers

flexible brightness control. These control

methods can be applied to the circuit in two

different ways which provide flexible

solution. To determine the value of RSET,

use the “ISET vs. VCTR” graph under the

“typical characteristics” section.

Scenario 1 - Analog

Set VCONTROL and RSET for LED current

ILED=200×(VCONTROL-VCTR)/RSET

Scenario 2 – PWM - 1

ILED=200×(VCONTROL-VCTR)/RSET

VCONTROL = PWM

Amplitude sets maximum LED current

Pulse width controls between 0 and

maximum

Scenario 3 – PWM - 2

ILED ~ 200×ISET

VEN = PWM

Amplitude has no effect on current

Pulse width controls between 0 and

maximum

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