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UCC28250RGPR Datasheet(PDF) 4 Page - Texas Instruments |
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UCC28250RGPR Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 50 page  UCC28250 SLUSA29B – APRIL 2010 – REVISED OCTOBER 2010 www.ti.com ELECTRICAL CHARACTERISTICS (1) (continued) VDD = 12 V, 1-µF capacitor from VDD and VREF to GND, TA = TJ = -40°C to 125°C, RT = 75 kΩ connected to ground to set FSW = 200 kHz (unless otherwise noted). PARAMETER TEST CONDITION MIN TYP MAX UNITS Oscillator Nominal switching frequency FSW(nom) at OUTA or OUTB set by RT RT/SYNC = 75 k Ω, RSP = 20 kΩ 185 200 215 resistor kHz Minimum switching frequency FSW(min_sync) at OUTA or OUTB set by fRT/SYNC = 100 kHz 85 external sync frequency Maximum switching frequency at OUTA or OUTB FSW(max_sync) fRT/SYNC = 2.5 MHz 1.15 MHz set by external sync frequency External synchronization 1 signal high V External synchronization 0.2 signal low Voltage Reference VDD = from 7 V to 17 V, IVREF = 2 mA 3.22 3.30 3.38 VVREF Output voltage V 0 < IREF < 10 mA 3.22 3.30 3.38 Short circuit current VREF = 3 V, TJ = 25°C 12 25 40 mA Current Sense, Cycle-by-Cycle Current Limit With Hiccup VILIM ILIM cycle-by-cycle threshold 0.495 0.502 0.509 V Propagation delay from ILIM TPDILIM Exclude leading edge blanking 15 25 36 ns to OUTA and OUTB outputs TBLANK leading edge blanking 40 60 90 ns Current limit shutdown delay Measured at HICC pin 55 75 95 timing program current µA Hiccup timing program Measured at HICC pin 2 2.7 3.5 current Current limit shutdown delay VHICC_SD 0.55 0.60 0.65 timer threshold at HICC VHICC_PU HICC pull-up threshold 2.3 2.4 2.5 V VHICC_RST Hiccup restart threshold 0.25 0.30 0.35 10-V ramp charging voltage source with 40-k Ω VCS(max) RAMP/CS clamp voltage 3.5 4.0 4.5 current limiting resistor 4 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): UCC28250 |
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