Texas Instruments UCC28742EVM-001, Руководство пользователя

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1
2
6
Np/2
Np/2
4
3
Na1
Na2
5
Nc1 Nc2
Ns1 Ns2
FL1
FL2
Flying Leads (FL)
Transformer Details
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12 SLUUBU4B – March 2018 – Revised June 2018
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Using the UCC28742EVM-001 10-W Converter
7 Transformer Details
Wurth Elektronik transformer part number 750315841 is used on this design and wound on an RM6 core.
Figure 22. Transformer Schematic
Table 4. Transformer Specifications
PARAMETER PINS/LEADS TEST CONDITIONS VALUE
D.C. resistance 1 – 2 At 20ºC 0.56
Ω
, ±10%
D.C. resistance 3 – 4 At 20ºC 0.157 Ω , ±10%
D.C. resistance FL1 – FL2 At 20ºC 0.012 Ω , ±20%
D.C. resistance 3 – 5 At 20ºC 0.142 Ω , ±10%
D.C. resistance 2 – 6 At 20ºC 0.845 Ω , ±10%
Inductance 1 – 6 10 kHz, 100 mV, Ls 750 µH, ±10%
Saturation current 1 – 6 20% rolloff from initial 800 mA
Leakage inductance 1 – 6 tie (FL1 + FL2, 3 + 4 + 5),100
kHz, 100 mV, Ls
4.0 µH typical, 6.0 µH
maximum
Dielectric 6vFL1 tie (5 + 6), 3750 V
AC
, 1 second
Turns ratio (1 – 6):(FL1 – FL2) 13:1, ±1%
Turns ratio (1 – 6):(3 – 4) 4:1, ±1%
Turns ratio (1 – 6):(5 – 3) 5.78:1, ±1%
Turns ratio (1 – 2):(2 – 6) 1:1, ±1%