BL8501 datasheet(3/10 Pages) BELLING

3 / 10 page

http://www.belling.com.cn

- 3-

8/8/2006

Total 10 Pages

BL8501

ABSOLUTE MAXMUM RATINGS

Symbol

Item

Rating

Unit

VIN

VIN Supply Voltage

VEXT

EXT Pin Output Voltage

-0.3 ~ VIN +0.3

VCE

CE Pin Input Voltage

-0.3 ~ VIN +0.3

VFB

VFB Pin Input Voltage

-0.3 ~ VIN +0.3

IEXT

EXT Pin Inductor Drive Output Current

Power Dissipation

100

Topt

Operating Temperature Range

-20 ~ +85

Tstg

Storage Temperature Range

-55 ~ +125

ELECTRICAL CHARACTERISTICS

Symbol

Item

Conditions

Min.

Typ.

Max.

Unit

VIN

Operating Input Voltage

3.5

VFB

Feedback Voltage

VIN=VCE=8V,

IFB=-100mA

0.98

1.00

1.02

VFB/

Feedback Voltage

Temperature Coefficient

-20

Topt

100

ppm/

fosc

Oscillator Frequency

VIN=VCE=8V,

IFB=-100mA

400

500

600

KHz

fOSC/

Oscillator Frequency

Temperature Coefficient

-20

Topt

0.2

IDD1

Supply Current 1

VIN = VCE = VFB =8.0V

Istb

Standby Current

VIN=8.0V,

VCE

=VFB

=0V

IEXTH

EXT “H” Output Current

VIN = 8V, VEXT = 7.9V,

VCE =0, VFB =8V

-7.8

IEXTL

EXT “L” Output Current

VIN = 8V, VEXT = 0.1V,

VCE = 8V, VFB = 0V

6.1

ICEH

CE “H” Input Current

VIN = VCE = VFB =8.0V

0.5

ICEL

CE “L” Input Current

VIN = VFB =8.0V, VCE =

-0.5

VCEH

CE “H” Input Voltage

VIN = 8V, VFB = 0V

1.5

VCEL

CE “L” Input Voltage

VIN = 8V, VFB = 0V

0.3

Maxdty

Oscillator Maximum Duty

Cycle

100

Tstart

Delay Time by Soft-start

function

VIN = 8V, IFB = -10mA

VCE = 0

>8V

Tprot

Delay Time for protection

circuit

VIN = VCE = 8V

VFB = 2.5V

>0V

150

200

250

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