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UCC2570 Datasheet(PDF) 3 Page - Texas Instruments |
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UCC2570 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 9 page 3 UCC1570 UCC2570 UCC3570 ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = 0 to 70°C for the UCC3570, TA= –40 to 85°C for the UCC2570, TA=–55 to 125°C for the UCC1570, RISET=100k, RSLOPE=121k, CFREQ=180pF, CRAMP=150pF, VCC=11V and TA=TJ. PARAMETER TEST CONDITIONS Min Typ Max Units Line Sense Vth High Line Comparator 3.9 4 4.1 V Vth Low Line Comparator 0.96 1 1.04 V lib (VFWD) 0 ±100 nA Oscillator Frequency 90 100 110 kHz Ramp Generator IRAMP/ISLOPE 9 10 11 A/A –IRAMP/IISET 9 10 11 A/A Peak Ramp Voltage 3.8 4 4.2 V Valley Ramp Voltage 0.95 1 1.05 V ISET Voltage Level 0.95 1 1.05 V Soft Start Saturation VCC = 11V, VCC Comparator Off 25 100 mV ISOFTST/IISET 0.8 1 1.2 A/A Pulse Width Modulator lib(FEEDBK) 0 ±100 n A FEEDBK Zero Duty Cycle 0.9 1 1.1 V Maximum Duty Cycle, (Note 1) 3.8 4 4.2 V Current Limit lib(CURLIM) 0 ±100 nA Vth Current Limit 180 200 220 mV Vth Shutdown 500 600 700 mV Fault Counter Vth 3.8 4 4.2 V Vsat 0 100 mV ICOUNT/IISET 0.8 1 1.2 A/A Output Driver Vsat High IOUT = –100mA 0.4 1 V Vsat Low IOUT = 100mA 0.4 1 V Rise/Fall Time COUT = 1nF, (Note 1) 20 100 ns Note 1: This parameter guaranteed by design but not 100% tested in production. VCC: Chip supply voltage pin. Bypass to PGND with a low ESL/ESR 0.1 µF capacitor plus a capacitor for gate charge storage. Lead lengths must be minimum. PGND: Ground pin for the output driver. Keep connec- tions less than 2cm. Carefully maintain low impedance path for high current return. OUT: Gate drive output pin. Connect to the gate of a power MOSFET with a resistor greater than 2 Ω. Keep connection lengths under 2cm. VFWD: Voltage Feed Forward and Line Sense pin. Con- nect to input DC line using a resistive divider. SLOPE: Program the charging current for RAMP with a resistor from this pin to GND. This pin will follow VFWD. FEEDBK: Input to the pulse width modulator comparator. Drive this pin with an optocoupler to GND and a resistor to VREF. Modulation input range is from 1V to 4V. ISET: A resistor from this pin to GND programs RAMP discharge current, FREQ current, SOFTST current, and COUNT current. PIN DESCRIPTIONS |
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