VIPER319LDTR datasheet(7/39 Pages) STMICROELECTRONICS

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Table 7. Controller section

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

E/A

VFB_REF

Reference voltage

1.175

1.2

1.225

VFB_DIS

E/A disable voltage

150

180

210

IFB_PULL UP

Pull-up current

0.9

1.1

µA

Trans conductance

VCOMP = 1.5 V, VFB > VFB_REF

400

550

700

µA/V

ICOMP1

Max. source current

VCOMP = 1.5 V, VFB = 0.5 V

100

125

µA

ICOMP2

Max. sink current

VFB= 2 V, VCOMP = 1.5 V

100

125

µA

RCOMP(DYN)

Dynamic resistance

VCOMP = 2.7 V, FB = GND

kΩ

VCOMPH

Current limitation threshold

2.75

3.1

3.45

VCOMPL

PFM threshold

0.6

0.8

HCOMP

ΔVCOMP/ΔIDRAIN

VIPER317*

3.8

4.2

4,6

VIPER318*

3.2

3.5

3.8

V/A

VIPER319*

2.9

3.2

3.5

OLP and timing

IDLIM

Drain current limitation

TJ = 25°C , VIPER317*

675

710

745

TJ = 25°C , VIPER318*

810

850

890

TJ = 25°C , VIPER319*

940

990

1040

VIPER317*(1)

639

710

781

VIPER318*(1)

765

850

935

VIPER319*(1)

891

990

1089

I2f

Power coefficient

IDLIM_TYP2 x FOSC_TYP

VIPER317L

-10%

30.2

+10%

A2·kHz

VIPER317H

66.5

VIPER318X

21.7

VIPER318L

43.4

VIPER318H

95.4

VIPER319X

29.4

VIPER319L

58.8

VIPER319H

129.4

IDlim_PFM

Drain current limitation at light load

TJ=25°C, VCOMP=VCOMPL(2)

VIPER317* (1)

110

140

TJ = 25°C, VCOMP= VCOMPL(2)

VIPER318*(1)

100

130

160

TJ = 25°C, VCOMP= VCOMPL(2)

VIPER319*(1)

120

150

180

TJ = 25°C, VCOMP = VCOMPL(2)

VIPER319*C(1)

190

270

tOVL

Overload delay time

tOVL_max

Max. overload delay time

When in pulse skipping

100

VIPER31

Electrical and thermal ratings

DS13285 - Rev 6

page 7/39

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