yb1518 YOBON TECHNOLOGIES,INC., yb1518 Datasheet

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yb1518

Manufacturer Part Number

yb1518

Description

Step-up Dc-dc Converter White Led Driver

Manufacturer

YOBON TECHNOLOGIES,INC.

Datasheet

1.YB1518.pdf (12 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Meier Automation Equipment Co., Limited

Part Number:

yb1518ST25

Manufacturer:

YOBON

Quantity:

20 000

Company:

Meier Automation Equipment Co., Limited

Meier Automation Equipment Co., Limited

Part Number:

yb1518ST26

Manufacturer:

YOBON

Quantity:

20 000

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Description

The YB1518 is a step-up DC-DC converter;

operates as current source to drive up to 6

white LEDs(VIN at 3.0V) or 8 LEDs(VIN at

3.5V) or 9 LEDs(VIN at 3.5V) in series.

Series connecting of the LEDs provides

identical LED currents resulting in uniform

brightness and eliminating the need for

ballast resistors. The light intensity of these

LEDs is proportional to the current passing

through them. The YB1518 switches at a

fixed frequency of ~930KHz, allowing the

use of tiny, low profile inductors and

capacitors to minimize footprint and cost in

space

cellular phone backlighting or other hand

held equipment.

The YB1518 can drive up to 9 white LEDs

from a single Li-Ion battery. The wide input

voltage range from 2.7V to 7V is ideal for

portable

conversion efficiency. To control LED

brightness, the LED current can be pulsed

by applying a PWM (pulse width modulated)

signal with a frequency range of 100Hz to

1KHz to the CTRL pin.

YB1518 has integrated Latched Over

Voltage Protection that prevents damage to

the device in case of a high impedance

output due to faulty LED or open circuit

caused by abnormal conditions.

Typical Application Circuit

YB1518 Rev.1.3

consideration

applications

applications

Figure 1: Typical Application Circuit

with

www.yobon.com.tw

Step-up DC-DC Converter White LED Driver

higher

for

Features

Applications

Built-in internal switch

2.7V to 7V input range

<1uA shutdown current

PWM dimming control 100Hz to 1KHz

Analog dimming control

Internal Soft Start

Drives up to 9 white LEDs(VIN at 3.5V)

Over voltage protection 34V

Small 5-Lead SOT-23 package

100mV Low Reference Voltage

LCD Display Module

White LED Backlighting

PDAs, GPS terminals

Digital Cameras

Cellular Phone

Electronic Books

Portable Applications

YB1518

1

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