Datasheet

VIPER37 Electrical data
Doc ID 022218 Rev 1 9/35
Table 8. Controller section
Symbol Parameter Test condition Min. Typ. Max. Unit
Feedback pin
V
FBolp
Overload 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
Feedback 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
∆V
FB
/ ∆I
D
26V/A
CONT pin
V
CONT_l
Low level clamp voltage I
CONT
= -100 µA 0.5 V
V
CONT_h
High level clamp voltage I
CONT
= 1 mA 5 5.5 6 V
Current limitation
I
Dlim
Max. drain current limitation
V
FB
= 4 V,
I
CONT
= -10 µA
T
J
= 25 °C
0.95 1 1.05 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
VIPER37L V
DD
= operating
voltage range,
V
FB
= 1 V
54 60 66 kHz
VIPER37H 103 115 127 kHz
FD Modulation depth
VIPER37L ±4 kHz
VIPER37H ±8 kHz
FM Modulation frequency 250 Hz
D
MAX
Maximum duty cycle 70 80 %