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VIPER25HD Datasheet(PDF) 8 Page - STMicroelectronics

Part No. VIPER25HD
Description  Off-line high voltage converters
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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VIPER25HD Datasheet(HTML) 8 Page - STMicroelectronics

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Electrical data
VIPER25
8/40
Doc ID 15585 Rev 4
Table 8.
Controller section
Symbol
Parameter
Test condition
Min.
Typ.
Max. Unit
Feedback pin
VFBolp
Over load shutdown threshold
4.5
4.8
5.2
V
VFBlin
Linear dynamics upper limit
3.2
3.3
3.4
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
uA
3.3 V < VFB < 4.8 V
-3
uA
RFB(DYN)
Dynamic resistance
VFB < 3.3 V
14
19
k
Ω
HFB
ΔV
FB / ΔID
26
V/A
ZCD pin
VZCDCLh
Upper clamp voltage
IZCD = 1 mA
5
5.5
6
V
VZCDAth
Arming voltage threshold
Positive-going edge
0.8
V
VZCDTth
Triggering voltage threshold
Negative-going edge
0.6
V
IZCD
Internal pull-up
-10
µA
TBLANK
Turn-on inhibit time after
MOSFET’s turn-off
VZCD < 1 V
6.3
µs
VZCD >1 V
2.5
µs
Current limitation
IDlim
Max drain current limitation
VFB = 4 V,
IZCD = -10 µA
TJ = 25 °C
0.66
0.7
0.74
A
tSS
Soft start time
VIPER25L
3.5
ms
VIPER25H
4.2
ms
tSU
Start up time
VIPER25L
7.5
15
ms
VIPER25H
9.5
18
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
Overcurrent protection (2nd OCP)
IDMAX
Second overcurrent threshold
1.2
A
Overvoltage protection
VOVP
Overvoltage protection
threshold
3.8
4.2
4.6
V
TSTROBE
Overvoltage protection strobe
time
2.2
μs


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