YB1520 datasheet(3/10 Pages) YOBON

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YB1520

Step-up DC-DC Converter, White LED Driver

YB1520 Rev.1.4

www.yobon.com.tw

Absolute Maximum Ratings

VIN..........................................................10V

SW Voltage .............................................32V

FB Voltage ................................................5V

CTRL Voltage............................................5V

Maximum Junction Temp, TJ............... 150°C

Lead Temperature (Soldering 10 sec).......300°C

Recommended Operating Conditions

Operating Temperature.........-40°C to 85°C

Supply Voltage........................... 2.7V to 7V

SW Voltage...........................................20V

Electrical Characteristics

Table 2

(VIN = 3.3V, CIN = 1uF, COUT = 4.7μF, TA=25°C, unless otherwise noted.)

Description

Symbol

Test Conditions

MIN

TYP

MAX

Units

Input Voltage Range

VIN

2.7

Not Switching

VFB = 0.3V

1.2

1.5

1.7

Shutdown

ISD

CTRL = 0V

0.3

Feedback Voltage

VFB

IOUT = 20mA,VOUT = 12.5V

Circuit of Figure 1

180

200

220

ICL

100% duty cycle

420

450

Switch Current Limit

ILIM

40% duty cycle

250

FB Pin Bias Current

VFB = 200mV

Switching Frequency

FSW

680

700

720

KHz

Maximum Duty Cycle

DMAX

Minimum Duty Cycle

DMIN

Switch Vcesat

VSAT

At ISW = 200mA

120

Switch Leakage Current

ILKG

CTRL = 0.3V

μA

Full On

1.7

1.8

VCTRL for Full LED Current

VCTL

Full Off

0.2

0.3

CTRL Pin Bias Current

ICTL

CTRL = 2V

μA

Over Voltage Protection

OVP

Over Thermal Protection

OTP

160

°C

Thermal Resistance

θJA

220

°C/W

Note :

Absolute maximum ratings are limits beyond which damage to the device may occur.

The maximum allowable power dissipation is a function of maximum function temperature, TJ(MAX), the junction

to ambient thermal resistance, θJA , and the ambient temperature. The maximum allowable, power dissipation

at any ambient temperature is calculated using: PD(MAX)= [TJ(MAX)-TA]/θJA . Exceeding the maximum allowable

power dissipation will cause excessive die temperature. All limits at temperature extremes are guaranteed via

correlation using standard statistical methods.

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