VIPER35 datasheet(11/44 Pages) STMICROELECTRONICS

Part #	VIPER35

Description	Quasi-resonant high performance off line high voltage converter

PDF	44 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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11 / 44 page

DocID026980 Rev 4

11/44

VIPer35

Electrical ratings

ZCD pin

VZCDCLh

Upper clamp voltage

IZCD = 1 mA

5.5

VZCDAth

Arming voltage

threshold

Positive-going edge

0.75

0.8

0.85

VZCDTth

Triggering voltage

threshold

Negative-going edge

0.55

0.6

0.65

IZCD

Internal pull-up

VFB < VFBlin

-7.5

-10

-12.5

µA

tDELAY

Turn-on delay after

ZCD trigger

300

tBLANK

Turn-on inhibit time

after MOSFET turn-

off

VZCD < 1 V

6.3

µs

VZCD >1 V

2.5

µs

Current limitation

IDlim

Drain current

limitation

VFB = 4 V

IZCD = -10 µA

TJ = 25 °C

0.9511.05

VFB = 4 V

IZCD = - 55 µA

TJ = 25 °C

0.68

0.8

0.92

VFB = 4 V

IZCD = - 105 µA

TJ = 25 °C

0.55

0.65

0.75

tSS

Soft-start time

VIPER35L

3.5

VIPER35H

4.2

tSU

Start-up time

VIPER35L

7.5

VIPER35H

9.5

tON_MIN

Minimum turn-on

time

220

400

480

Propagation delay

(1)

100

tLEB

Leading edge

blanking

(1)

300

ID_BM

Peak drain current

during burst mode

VFB = 0.6 V

120

170

220

Table 7. Controller section (continued)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

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