VIPER50B datasheet(5/20 Pages) STMICROELECTRONICS

Part #	VIPER50B

Description	SMPS PRIMARY I.C.

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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5 / 20 page

ELECTRICAL CHARACTERISTICS (continued)

OSCILLATOR SECTION

Symb ol

Parameter

T est Con ditio ns

Mi n.

Typ .

Max.

Un it

FSW

Oscillator F requency

Total Variation

RT = 8.2 K

Ω

CT =2.4 nF

VDD = 9 to15 V

with RT

± 1%

CT

± 5%

(see fig. 6 and fig.9)

90

100

110

KHz

VOSCih

Oscillator Peak Volt age

7.1

V

VOSCil

Oscillator Valley Voltage

3.7

V

ERROR AMPLIFIER SECTION

Symb ol

Parameter

Test Cond ition s

Mi n.

Typ .

Max.

Un it

VDDreg

VDD Regulat ion Point

ICOMP = 0 mA

(see f ig.1)

12. 6

13

13.4

V

∆VDDreg

Total Variation

TJ = 0 to 100

oC2

%

GBW

Unity Gain Bandwidt h

From Input = VDD t o O utput = VCOMP

CO MP pin is open (see fig. 10)

150

KHz

AVOL

Open Loop Voltage

Gain

CO MP pin is open (see fig. 10)

45

52

dB

Gm

DC T ransconduct ance

VCOMP = 2.5 V

(see f ig. 1)

1. 1

1.5

1.9

mA/V

VCOMPL O

Output Low Level

ICOMP =-400

µAVDD =14 V

0.2

V

VCOMPHI

Output High Level

ICOMP = 400

µAVDD =12 V

4.5

V

ICOMPLO

Output Low Current

Capability

VCOMP =2.5 V

VDD = 14 V

-600

µA

ICOMPHI

Output High Current

Capability

VCOMP =2.5 V

VDD = 12 V

600

µA

PWM COMPARATOR SECTION

Symb ol

Parameter

Test Cond ition s

Mi n.

Typ .

Max.

Un it

HID

∆VCOMP/∆IDpeak

VCOMP = 1 to 3 V

0. 7

1

1.3

V/A

VCOMPoff

VCOMP off set

IDp eak =10 mA

0.5

V

IDpeak

Peak Current Limitat ion VDD = 12V

COMP pinopen

3

4

5.4

A

td

Current Sense Delay

to turn-off

ID = 0.5 A

250

ns

tb

Blanking Time

250

360

ns

ton(min)

Minimum on T ime

350

ns

SHUTDOWN AND OVERTEMPERATURE SECTION

Symb ol

Parameter

Test Cond ition s

Mi n.

Typ .

Max.

Un it

VCOMPth

Restart threshold

(see f ig. 4)

0.5

V

tDISsu

Disable Set Up Time

(see f ig. 4)

1.7

5

µs

Ttsd

Thermal Shutdown

Temperat ure

(see f ig. 8)

140

170

oC

Thyst

Thermal Shutdown

Hysteresis

(see f ig. 8)

40

oC

VIPER50B/BSP

5/20

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