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UCC28089D Datasheet(PDF) 8 Page - Texas Instruments |
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UCC28089D Datasheet(HTML) 8 Page - Texas Instruments |
8 / 19 page UCC28089 SLUS623 − SEPTEMBER 2004 8 www.ti.com APPLICATION INFORMATION Using the UCC28089 as the Primary-Side start-up Controller in a Cascaded Push-Pull Buck Two-Stage Converter The cascaded push-pull topology is ideal for converting from moderate bus voltages, such as 48-V telecom buses, to sub 2-V output voltages. The general topology is shown in Figure 2 using the UCC28089 as the primary-side start-up controller and the UCC2540 as the secondary-side regulator [3]. UDG-04100 CT RB RA 10 V CR1 CR2 VIN = 48 V VO 1.2 V 2 1 4 3 7 8 5 6 UCC28089 SYNC DIS CT CS VDD OUTA OUTB GND + − IN OUT COM L.REG 2 1 4 3 19 20 17 18 UCC2540 ISET/SD REF G2C SYNCIN SWS BST G1 SW 6 5 8 7 RAMP GND VEA− CEA− 10 9 COMP TR 15 16 13 14 VDD PGND G2 VDRV 11 12 G2S SS + − Figure 2. Cascaded Push-Pull Buck Two-Stage Converter |
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