Datasheet

VIPER27 Electrical data
Doc ID 15133 Rev 5 7/31
Table 8. Controller section
Symbol Parameter Test condition Min Typ Max Unit
Feed-back pin
V
FBolp
Over load shutdown threshold 4.5 4.8 5.2 V
V
FBlin
Linear dynamics upper limit 3.2 3.5 3.7 V
V
FBbm
Burst mode threshold Voltage falling 0.6 V
V
FBbmhys
Burst mode hysteresis Voltage rising 100 mV
I
FB
Feed-back sourced current
V
FB
= 0.3 V -150 -200 -280 μA
3.3 V < V
FB
< 4.8 V -3 μA
R
FB(DYN)
Dynamic resistance V
FB
< 3.3 V 14 21 kΩ
H
FB
ΔV
FB
/ ΔI
D
26V/A
CONT pin
VCONT_l Low level clamp voltage I
CONT
= -100 µA 0.5 V
Current limitation
I
Dlim
Max drain current limitation
V
FB
= 4 V,
I
CONT
= -10 µA
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 220 400 480 ns
td Propagation delay 100 ns
t
LEB
Leading edge blanking 300 ns
I
D_BM
Peak drain current during burst mode V
FB
= 0.6 V 160 mA
Oscillator section
F
OSC
VIPER27L
V
DD
= operating voltage range,
V
FB
= 1 V
54 60 66 kHz
VIPER27H 103 115 127 kHz
FD Modulation depth
VIPER27L ±4 kHz
VIPER27H ±8 kHz
FM Modulation frequency 250 Hz
D
MAX
Maximum duty cycle 70 80 %
Over current protection (2
nd
OCP)
I
DMAX
Second over current threshold 1 A
Overvoltage protection
V
OVP
Overvoltage protection threshold 2.7 3 3.3 V
T
STROBE
Overvoltage protection strobe time 2.2 us