UCC28251_15 Datasheet, PDF (39/55 Pages) Texas Instruments – UCC28251 Advanced PWM Controller With Prebias Operation

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UCC28251
SLUSBD8E – FEBRUARY 2013 – REVISED DECEMBER 2014
R
3
=
0.7 V
´ (V_R
-
V
F
)
-
11mA
´
R
2
11mA
´
V
r
´ (V_R
-
0.7 V)
=
0.7 V ´ (73 V - 72 V)- 11mA ´ 866 W ´ (73 V - 0.7 V)
=
= 14 W Þ R14 = 14 W
11mA ´ 73 V
(40)
9.2.1.2.8 Step 3-7: Select Capacitance for VDD and VREF
As recommended by the datasheet, select C6 = C4 = 1.0 µF. The final design is shown in Figure 46.
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39