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UCC28056CDBVT Datasheet(PDF) 32 Page - Texas Instruments

Part # UCC28056CDBVT
Description  UCC28056 6-Pin Single-Phase Transition-Mode PFC Controller
PDF  55 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

UCC28056CDBVT Datasheet(HTML) 32 Page - Texas Instruments

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OutMax
InRMSMin
MosRMSMax
InRMSMin
Out
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P
32
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UCC28056
SLUSD37E – OCTOBER 2017 – REVISED NOVEMBER 2019
www.ti.com
Product Folder Links: UCC28056
Submit Documentation Feedback
Copyright © 2017–2019, Texas Instruments Incorporated
(28)
Equation 29 describes the duty cycle of switch conduction for ideal transition mode (CrM) operation.
(29)
The switch ON time is constant across the Line cycle but the OFF time varies according to the position in the
Line cycle. Volt-second balance across the Boost inductor, within each switching cycle, requires that.
(30)
Equation 31 calculates the duty cycle of switch conduction.
(31)
Equation 32 describes the RMS switch current across a complete Line half-cycle.
(32)
Maximum RMS current in the switch occurs at maximum load and minimum Line.
(33)
Use the following guidelines for MOSFET selection for the Boost switch.
•
The voltage rating must be greater than the maximum output voltage. Under transient or Line surge testing
the output voltage may exceed the normal regulation level. For this design example, the MOSFET voltage
rating is 650 V supports a regulated output voltage of 390 V.
•
Based upon an acceptable level of conduction loss in the MOSFET, the required on-resistance (rDS(on)) value
can be calculated from the maximum RMS current. For this example design an STF24N60DM2 MOSFET,
from STMicrolelectronics was selected with an on-resistance of 0.37 Ω, when TJ = 125°C which allows
maximum conduction power loss (less than 1.7 W) in the MOSFET.
•
For best efficiency, use a MOSFET that incorporates a fast body diode. Operation using discontinuous
inductor current (DCM) from a low input voltage incurs additional switching power loss if a MOSFET with slow
body diode is used.



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