VIPER26 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

VIPER26

Fixed frequency VIPer™ plus family

STMicroelectronics 

VIPER26

Electrical data

Table 8. Controller section

Symbol

Parameter

Test condition

Min Typ Max Unit

Error amplifier

VREF_FB FB reference voltage

IFB_PULL UP Current pull up

GM

Trans conductance

Current setting (LIM) pin

3.2 3.3 3.4 V

-1

µA

2

mA/V

VLIM_LOW Low level clamp voltage

Compensation (COMP) pin

ILIM = -100 µA

0.5

V

VCOMPH Upper saturation limit

VCOMPL Burst mode threshold

VCOMPL_HYS Burst mode hysteresis

HCOMP ∆VCOMP / ∆IDRAIN

RCOMP(DYN) Dynamic resistance

ICOMP

Source / sink current

Max source current

Current limitation

TJ = 25 °C

TJ = 25 °C

TJ = 25 °C

VFB = GND

VFB > 100 mV

VCOMP = GND, VFB = GND

3

V

1 1.1 1.2 V

40

mV

3

V/A

15

kΩ

150

µA

220

µA

IDlim

tSS

TON_MIN

IDlim_bm

Overload

Drain current limitation

Soft-start time

Minimum turn ON time

Burst mode current limitation

ILIM = -10 µA, VCOMP = 3.3 V, TJ = 25 °C 0.66 0.7 0.74 A

8.5

ms

480 ns

VCOMP = VCOMPL

145

mA

tOVL

tRESTART

Overload time

Restart time after fault

Oscillator section

50

ms

1

s

FOSC Switching frequency

FD

Modulation depth

FM

DMAX

Modulation frequency

Maximum duty cycle

Thermal shutdown

VIPER26L

VIPER26H

FOSC = 60 kHz

FOSC = 115 kHz

54 60 66 kHz

103 115 127 kHz

±4

kHz

±8

kHz

230

Hz

70

80 %

TSD

THYST

Thermal shutdown temperature

Thermal shutdown hysteresis

150 160

°C

30

°C

Doc ID 17736 Rev 2

7/25

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