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YB1303SC76A

Low Dropout LED Driver

YOBON TECHNOLOGIES,INC. 

YB1303

Low Dropout LED Driver

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 of LEDs and flexible

brightness control – whether using analog

or PWM (Notes).

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.

-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:

y No need for current matching resistors

and discrete transistor for brightness

control.

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

y Amplitude sets maximum LED current

y Pulse width controls between 0 and

maximum

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.

Scenario 3 – PWM - 2

ILED ~ 200×ISET

VEN = PWM

y Amplitude has no effect on current

y Pulse width controls between 0 and

maximum

YB1303 Rev.1.0

www.yobon.com.tw

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