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UC2879 Fiches technique(PDF) 3 Page - Texas Instruments |
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UC2879 Fiches technique(HTML) 3 Page - Texas Instruments |
3 / 7 page 3 UC1879 UC2879 UC3879 ELECTRICAL CHARACTERISTICS Unless specified; VC = VIN = VUVSEL =12V, CT = 470pF, RT = 9.53k, RDELSETA-B = RDELSEC-D = 4.8k, CDELSETA-B =CDELSETC-D = 0.01µF, TA =TJ. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Undervoltage Lockout Start Threshold VUVSEL = VIN 9 10.75 12.5 V VUVSEL = Open 12.5 15.25 16.5 V UVLO Hysteresis VUVSEL = VIN 1.15 1.75 2.15 V VUVSEL = Open 5.2 6 7.4 V Input Bias, UVSEL Pin VUVSEL =VIN=8V 30 µA Supply Current IVIN Startup VIN = VUVSEL = 8V, VC = 18V, IDELSETA-B = IDELSETC-D =0 150 600 µA IVC Startup VIN = VUVSEL = 8V, VC = 18V, IDELSETA-B = IDELSETC-D =0 10 100 µA IVIN Operating UC3879, UC2879 23 33 mA UC1879 23 36 mA IVC Operating 48 mA Voltage Reference Output Voltage TJ = +25°C 4.92 5 5.08 V Line Regulation 11V < VIN < 18V 1 10 mV Load Regulation IVREF = –10mA 5 20 mV Total Variation Line, Load, Temperature 4.875 5.125 V Short Circuit Current VREF = 0V, TJ =25°C –60 –15 mA Error Amplifier Error Amplifier Input Voltage 2.4 2.5 2.6 V Input Bias Current 0.6 3 µA AVOL 1V < VCOMP <4V 60 90 dB PSRR 11V < VIN < 18V 85 100 dB Output Sink Current VCOMP = 1V 1 2.5 mA Output Source Current VCOMP =4V −1.3 −0.5 mA Output Voltage High ICOMP = –0.5mA 4 4.7 5 V Output Voltage Low ICOMP = 1mA 0 0.5 1 V Slew Rate TA = +25°C 6 11 V/ µs PWM Comparator RAMP Offset Voltage TJ =25°C, Note 3 1.1 1.25 1.4 V PWM Phase Shift, VCOMP >VRAMPpeak +VRAMPoffset 98 99.7 102 % TDELSETA-B, TDELSETC-D = 0, Note 1 VCOMP < Zero Phase Shift Voltage 0 0.3 2 % Output Skew, VCOMP >VRAMPpeak +VRAMPoffset 10 ns TDELSETA-B, TDELSETC-D = 0, Note 1 VCOMP < Zero Phase Shift Voltage 10 ns Ramp to Output Delay, TDELSETA-B =0, TDELSETC-D =0 UC3879, UC2879 115 250 ns UC1879 115 300 ns Oscillator Initial Accuracy TA =25°C 180 200 220 kHz Voltage Stability 11V < VIN < 18V 1 2 % Total Variation Line, Temperature 160 200 240 kHz CLKSYNC Threshold 2.3 2.5 2.7 V Clock Out High 2.8 4 V Clock Out Low 0.5 1 1.5 V Clock Out Pulse Width 400 600 ns Ramp Valley Voltage 0.2 0.4 V |
Numéro de pièce similaire - UC2879 |
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Description similaire - UC2879 |
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