VIPER319HCDTR datasheet(8/39 Pages) STMICROELECTRONICS

8 / 39 page

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

tSS

Soft-start time

tON_MIN

Minimum turn-on time

VCC = 9 V,

VCOMP = 1 V,

VFB = VFB_REF

250

300

350

tRESTART

Restart time after fault

0.625

1.375

UVP

VUVP_th

UVP threshold

VCC = 9 V,

VCOMP = 1 V,

VFB = VFB_REF

0.38

0.4

0.42

IUVP_pull- up

UVP pull-up current

-1

µA

tUVP_DEB

Debounce time before UVP tripping

18.75

41.25

tUVP_REST

Debounce time for restoring normal

operation from UVP

18.75

41.25

Iq_DIS

Quiescient current during UVP

Not switching, VFB> VFB_REF

0.25

0.35

OVP

VOVP_th

Overvoltage protection threshold

VCC = 9 V,

VCOMP = 1 V,

VFB = VFB_REF

3.85

4.15

tOVP_DEB

Debounce time before OVP tripping

156

250

344

µs

tOVP_REST

Restart time after overvoltage

protection tripping

312

500

688

Oscillator

FOSC

Switching frequency

TJ = 25ºC VIPER31*X

kHz

TJ = 25ºC, VIPER31*L

TJ = 25ºC, VIPER31*H

119

132

145

FOSC MIN

Min. switching frequency

TJ = 25ºC (3)

13.5

16.5

kHz

Modulation depth

(4)

±7·FOSC

Modulation frequency

(4)

200

DMAX

Max. duty cycle

(4)

Thermal shutdown protection

TSD

Thermal shutdown temperature

threshold

(4)

150

160

°C

1. Measured at Vin = 100 Vdc in Flyback topology, with 1.5 mH transformer primary inductance

2. See Section 4.10: Pulse frequency modulation

3. See Section 4.7: Pulse skipping

4. Parameter assured by design and characterization.

VIPER31

Electrical and thermal ratings

DS13285 - Rev 6

page 8/39

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