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UCC28950PWTR Datasheet(PDF) 3 Page - Texas Instruments |
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UCC28950PWTR Datasheet(HTML) 3 Page - Texas Instruments |
3 / 42 page UCC28950 www.ti.com SLUSA16 – MARCH 2010 RECOMMENDED OPERATING CONDITIONS over operating free-air temperature range (unless otherwise noted) MIN TYP MAX UNIT Supply voltage range, VDD 8 12 17 V Operating junction temperature range -40 125 °C Converter switching frequency setting range, FSW(nom) 50 1000 kHz Programmable delay range between OUTA, OUTB and OUTC, OUTD set by 30 1400 resistors DELAB and DELCD and parameter KA (1) ns Programmable delay range between OUTA, OUTF and OUTB, OUTE set by 30 1400 resistor DELEF, and parameter KEF (1) Programmable DCM range as percentage of voltage at CS(1) 5% 30% Programmable TMIN range 100 800 ns (1) Verified during characterization only. ELECTRICAL CHARACTERISTICS (1) 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, RMIN = 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 the Typical Application Diagram. PARAMETER TEST CONDITION MIN TYP MAX UNITS Under Voltage Lockout (UVLO) UVLO_R Start threshold 6.75 7.3 7.9 TH UVLO_F Minimum operating voltage 6.15 6.7 7.2 V TH after start UVLO_H Hysteresis 0.53 0.6 0.75 YST 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 k Ω between RT and GND; Input pulses PHSYNC Total range 85 90 95 °PH 200 kHz, D = 0.5 at SYNC RT = 59 k Ω 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 Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Link(s): UCC28950 |
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