Switching Converters, Regulators & Controllers VIPer28 Rugged 800V Fixed freq 115 kHz

VIPER28HE

Manufacturer Part NumberVIPER28HE
DescriptionSwitching Converters, Regulators & Controllers VIPer28 Rugged 800V Fixed freq 115 kHz
ManufacturerSTMicroelectronics
VIPER28HE datasheet
 

Specifications of VIPER28HE

Output Voltage800 VOutput Current3 A
Output Power20 WInput Voltage8.5 V to 23.5 V
Switching Frequency115 KHzOperating Temperature Range- 40 C to + 150 C
Mounting StyleThrough HolePackage / CaseSDIP-10
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
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Operation descriptions
7.9
About CONT pin
Referring to the
Figure
1.
Current limit set point
2.
Overvoltage protection on the converter output voltage
The
Table 9 on page 20
activate one or plus of the CONT pin functions.
Figure 23. CONT pin configuration
R OV P
Daux
Auxiliary
winding
Table 9.
CONT pin configurations
Function / component
I
Dlim
I
reduction + OVP
Dlim
1. R
has to be fixed before of R
LIM
7.10
Feed-back and overload protection (OLP)
The
is a current mode converter: the feedback pin controls the PWM operation,
VIPER28
controls the burst mode and actives the overload protection.
Figure 29
show the internal current mode structure.
With the feedback pin voltage between
current is sensed and converted in voltage that is applied to the non inverting pin of the
PWM comparator. See
This voltage is compared with the one on the feedback pin through a voltage divider on
cycle by cycle basis. When these two voltages are equal, the PWM logic orders the switch
off of the power MOSFET. The drain current is always limited to I
In case of overload the feedback pin increases in reaction to this event and when it goes
higher than
V
FBlin
the OCP comparator,
20/32
27, through the CONT pin, the below features can be implemented:
referring to the
Figure
SOFT
START
CONT
OVP
R LIM
LOGIC
OVP
R
LIM
reduction
See
Figure 16
≥ 80 kΩ
OVP
See
Figure 16
OVP
and
V
FBbm
Figure 2 on page
3.
, the PWM comparator is disabled and the drain current is limited to I
seeFigure 2 on page
3.
Doc ID 15028 Rev 4
27, lists the external components needed to
OCP
-
BLOCK
+
From R SENSE
(1)
R
OVP
No
See
Equation 4
See
Equation 4
Figure 28 on page 22
, (see
Table 8 on page
V
FBlin
value.
Dlim
VIPER28
OCP
to GATE driver
D
AUX
No
Yes
Yes
and
7) the drain
by
Dlim