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UCC28250RGPT Datasheet(PDF) 25 Page - Texas Instruments |
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UCC28250RGPT Datasheet(HTML) 25 Page - Texas Instruments |
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25 / 53 page  VREF OVP UCC28250 + 0.7 V 11 mA R3 R1 PTC 4 NTC1 0.7 V R R 3.3 V 0.7 V = ´ - VREF OVP UCC28250 + 0.7 V 11 mA R3 R1 R2 VIN or VOUT NTC R4 UCC28250 www.ti.com SLUSA29C – APRIL 2010 – REVISED JULY 2011 Figure 18. Over Temperature Protection Figure 19 shows an external configuration using the OVP/OTP pin to achieve both over-voltage and over temperature protection. Follow the same design procedure for the OVP setting to choose R1, R2, and R3. Choose an NTC value at protection temperature much smaller than R1 and with the resistance at protection temperature as RNTC1, and recover temperature as RNTC2. The R4 value can be calculated as: (22) Because of the interaction between the two voltage dividers, over temperature protection thresholds move slightly with the different input voltages. Figure 19. Over Voltage and Over Temperature Protection With Single OVP Pin OUTA (9/16) and OUTB (8/15) OUTA and OUTB are the primary-side switch control signals. With the 0.2-A peak current capability, an external gate driver is required. SRA (7/14) and SRB (6/13) SRA and SRB are the synchronous rectifier control signals. With the 0.2A peak current capability, an external gate driver is required. GND (4/11) GND pin is the ground reference for the whole device. Tie all the signal returns to this pin. Copyright © 2010–2011, Texas Instruments Incorporated Submit Documentation Feedback 25 Product Folder Link(s): UCC28250 |
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