Datasheet

VIPER26 Electrical data
Doc ID 17736 Rev 2 7/25
Table 8. Controller section
Symbol Parameter Test condition Min Typ Max Unit
Error amplifier
V
REF_FB
FB reference voltage 3.2 3.3 3.4 V
I
FB_PULL UP
Current pull up -1 µA
G
M
Trans conductance 2 mA/V
Current setting (LIM) pin
V
LIM_LOW
Low level clamp voltage I
LIM
= -100 µA0.5V
Compensation (COMP) pin
V
COMPH
Upper saturation limit T
J
= 25 °C 3 V
V
COMPL
Burst mode threshold T
J
= 25 °C 1 1.1 1.2 V
V
COMPL_HYS
Burst mode hysteresis T
J
= 25 °C 40 mV
H
COMP
∆V
COMP
/ ∆I
DRAIN
3V/A
R
COMP(DYN)
Dynamic resistance V
FB
= GND 15 kΩ
I
COMP
Source / sink current V
FB
> 100 mV 150 µA
Max source current V
COMP
= GND, V
FB
= GND 220 µA
Current limitation
I
Dlim
Drain current limitation I
LIM
= -10 µA, V
COMP
= 3.3 V, T
J
= 25 °C 0.66 0.7 0.74 A
t
SS
Soft-start time 8.5 ms
T
ON_MIN
Minimum turn ON time 480 ns
I
Dlim_bm
Burst mode current limitation V
COMP
= V
COMPL
145 mA
Overload
t
OVL
Overload time 50 ms
t
RESTART
Restart time after fault 1 s
Oscillator section
F
OSC
Switching frequency
VIPER26L 54 60 66 kHz
VIPER26H 103 115 127 kHz
F
D
Modulation depth
F
OSC
= 60 kHz ±4 kHz
F
OSC
= 115 kHz ±8 kHz
F
M
Modulation frequency 230 Hz
D
MAX
Maximum duty cycle 70 80 %
Thermal shutdown
T
SD
Thermal shutdown temperature 150 160 °C
T
HYST
Thermal shutdown hysteresis 30 °C