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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VIPER28
7.11
Burst-mode operation at no load or very light load
When the load decrease the feedback loop reacts lowering the feedback pin voltage. If it
falls down the burst mode threshold, V
switched on. After the MOSFET stops, as a result of the feedback reaction to the energy
delivery stop, the feedback pin voltage increases and exceeding the level, V
V
, the power MOSFET starts switching again. The burst mode thresholds are
FBbmhys
reported on
Table 8
where power MOSFET is switching to period of time where power MOSFET is not switching;
this device working mode is the burst mode. The power delivered to output during switching
periods exceeds the load power demands; the excess of power is balanced from not
switching period where no power is processed. The advantage of burst mode operation is
an average switching frequency much lower then the normal operation working frequency,
up to some hundred of hertz, minimizing all frequency related losses. During the burst-mode
the drain current peak is clamped to the level, I
Figure 26. Burst mode timing diagram, light load management
V
COMP
V
+V
FBbm
FBbmhys
V
FBbm
I
DD
I
DD1
I
DD0
I
DRAIN
I
D_BM
, the power MOSFET is not more allowed to be
FBbm
and
Figure 30
shows this behavior. Systems alternates period of time
D_BM
Burst Mode
Doc ID 15028 Rev 4
Operation descriptions
+
FBbm
, reported on
Table 8
.
time
time
time
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