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VIPER37LE Datasheet(PDF) 9 Page - STMicroelectronics

Part # VIPER37LE
Description  VIPerPlus family: fixed frequency offline converter
PDF  35 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER37LE Datasheet(HTML) 9 Page - STMicroelectronics

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VIPER37
Electrical data
Doc ID 022218 Rev 1
9/35
Table 8.
Controller section
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
Feedback pin
VFBolp
Overload shutdown
threshold
4.5
4.8
5.2
V
VFBlin
Linear dynamics upper limit
3.2
3.5
3.7
V
VFBbm
Burst mode threshold
Voltage falling
0.6
V
VFBbmhys
Burst mode hysteresis
Voltage rising
100
mV
IFB
Feedback sourced current
VFB = 0.3 V
-150
-200
-280
µA
3.3 V < VFB < 4.8 V
-3
µA
RFB(DYN)
Dynamic resistance
VFB < 3.3 V
14
21
k
Ω
HFB
∆V
FB / ∆ID
26
V/A
CONT pin
VCONT_l
Low level clamp voltage
ICONT = -100 µA
0.5
V
VCONT_h
High level clamp voltage
ICONT = 1 mA
5
5.5
6
V
Current limitation
IDlim
Max. drain current limitation
VFB = 4 V,
ICONT = -10 µA
TJ = 25 °C
0.95
1
1.05
A
tSS
Soft-start time
8.5
ms
TON_MIN
Minimum turn-on time
220
400
480
ns
td
Propagation delay
100
ns
tLEB
Leading edge blanking
300
ns
ID_BM
Peak drain current during
burst mode
VFB = 0.6 V
160
mA
Oscillator section
FOSC
VIPER37L
VDD = operating
voltage range,
VFB = 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
DMAX
Maximum duty cycle
70
80
%



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