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VIPER28HDTR Datasheet(PDF) 7 Page - STMicroelectronics

Part # VIPER28HDTR
Description  Off-line high voltage converters
PDF  32 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER28HDTR Datasheet(HTML) 7 Page - STMicroelectronics

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VIPER28
Electrical data
Doc ID 15028 Rev 5
7/32
Table 8.
Controller section
Symbol
Parameter
Test condition
Min
Typ
Max
Unit
Feed-back pin
VFBolp
Over-load shut down 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
Feed-back sourced current
VFB = 0.3 V
-150
-200
-280
uA
3.3 V < VFB < 4.8 V
-3
uA
RFB(DYN)
Dynamic resistance
VFB < 3.3 V
14
20
k
Ω
HFB
ΔV
FB / ΔID
26
V/A
CONT pin
VCONT_l
Low level clamp voltage
ICONT = -100 µA
0.5
V
VCONT_h
High level clamp voltage
ICONT = 1mA
5
5.5
6
V
Current limitation
IDlim
Max drain current limitation
VFB = 4 V, ICONT = -10 µA
TJ = 25 °C
0.75
0.80
0.85
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
VIPER28L
VDD = operating voltage
range, VFB = 1 V
54
60
66
kHz
VIPER28H
103
115
127
kHz
FD
Modulation depth
VIPER28L±4
kHz
VIPER28H
±8
kHz
FM
Modulation frequency
250
Hz
DMAX
Maximum duty cycle
70
80
%



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