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UCC28950 Datasheet(PDF) 6 Page - Texas Instruments |
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UCC28950 Datasheet(HTML) 6 Page - Texas Instruments |
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6 / 74 page  UCC28950 SLUSA16C – MARCH 2010 – REVISED NOVEMBER 2015 www.ti.com 6.4 Thermal Information UCC28950 THERMAL METRIC(1) PW (TSSOP) UNIT 24 PINS RθJA Junction-to-ambient thermal resistance 93.3 °C/W RθJC(top) Junction-to-case (top) thermal resistance 24.2 °C/W RθJB Junction-to-board thermal resistance 47.9 °C/W ψJT Junction-to-top characterization parameter 0.7 °C/W ψJB Junction-to-board characterization parameter 47.4 °C/W RθJC(bot) Junction-to-case (bottom) thermal resistance n/a °C/W (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953. 6.5 Electrical Characteristics VDD = 12 V, TA = TJ = –40°C to +125°C, CVDD = 1 µF, CREF = 1 µF, RAB = 22.6 kΩ, RCD = 22.6 kΩ , REF = 13.3 kΩ, RSUM = 124 k Ω, RTMIN = 88.7 kΩ, RT = 59 kΩ connected between RT pin and 5-V voltage supply to set FSW = 100 kHz (FOSC = 200 kHz) (unless otherwise noted). All component designations are from Figure 48. PARAMETER TEST CONDITIONS MIN TYP(1) MAX UNIT UNDERVOLTAGE LOCKOUT (UVLO) UVLO_RTH Start threshold 6.75 7.3 7.9 V Minimum operating voltage UVLO_FTH 6.15 6.7 7.2 V after start UVLO_HYST Hysteresis 0.53 0.6 0.75 V SUPPLY CURRENTS IDD(off) Startup current VDD is 5.2 V 150 270 µA IDD Operating supply current 5 10 mA VREF OUTPUT VOLTAGE VREF VREF total output range 0 ≤ IR ≤ 20 mA; VDD = from 8 V to 17 V 4.925 5 5.075 V ISCC Short circuit current VREF = 0 V –53 –23 mA SWITCHING FREQUENCY (½ OF INTERNAL OSCILLATOR FREQUENCY FOSC) FSW(nom) Total range 92 100 108 kHz DMAX Maximum duty cycle 95% 97% SYNCHRONIZATION RT = 59 kΩ between RT and GND; Input pulses PHSYNC Total range 85 90 95 °PH 200 kHz, D = 0.5 at SYNC RT = 59 kΩ between RT and 5 V; –40 °C ≤ TJ ≤ FSYNC Total range 180 200 220 kHz +125°C TPW Pulse width 2.2 2.5 2.8 µs (1) Typical values for TA = 25°C 6 Submit Documentation Feedback Copyright © 2010–2015, Texas Instruments Incorporated Product Folder Links: UCC28950 |
Similar Part No. - UCC28950_15 |
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