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UC2902 Fiches technique(PDF) 3 Page - Texas Instruments |
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UC2902 Fiches technique(HTML) 3 Page - Texas Instruments |
3 / 6 page 3 UC1902 UC2902 UC3902 ELECTRICAL CHARACTERISTICS: Unless otherwise specified, TA = –55°C to +125°C for UC1902, –40°C to+85°C for UC2902, 0°C to 70°C for UC3902, VCC = 5V, RADJR = 1kΩ, VADJ = 5V, COMP = 5nF capacitor to GND, VSHARE– = 0V, TA = TJ. PARAMETERS TEST CONDITIONS MIN TYP MAX UNIT Share Sense Amplifier Input Impedance SHARE+ = 1V, SHARE– = 1V, SENSE = +10mV 10 15 k Ω 200 Ω resistor SHARE+ to GND, SHARE– = 1V, SENSE = +10mV 15 17 k Ω Threshold SENSE = 0V 41 70 100 mV CMRR SHARE 0 ≤ SHARE– ≤ 1V, SENSE = –2.5mV 50 60 dB AVOL from SHARE+ to ADJR SENSE = –2.5mV, 5nF capacitor COMP to GND, 1k resistor ADJR to GND 50 68 dB SENSE = –2.5mV, 5nF capacitor COMP to GND, 150 Ω resistor ADJR to GND 50 66 dB Slew Rate SHARE+ = Step of 0mV to 300mV through a 200 Ω resistor, RCOMP = 500 Ω resistor to 1.5V, SENSE = 10mV 0.4 0.7 1 V/ µs Error Amplifier Section Transconductance, SHARE+ to COMP 200 Ω resistor SHARE+ to GND 3.2 4.5 5.5 mS IOH COMP = 1.5V, SHARE+ ≥ +300mV, SENSE = +10mV –400 –325 –230 µA IOL 200 Ω resistor SHARE+ to GND, COMP = 1.5V, SENSE = +10mV 100 150 200 µA Input Offset Voltage 15 35 65 mV ∆ VIO/∆ VSENSE 1k Resistor, ADJR to GND, –2.5mV < SENSE < –25mV –6 0 6 mV/V ADJ Amplifier ADJR Low Voltage SENSE = +10mV, 200 Ω resistor SHARE+ to GND –1 0 1 mV ADJR High Voltage SENSE = +10mV, SHARE+ = 1V 1.4 1.8 2.1 V Current Gain ADJR to ADJ ADJR Current = –0.5mA, ADJ = 2.5V, SENSE = +10mV, SHARE+ = 1V 0.96 0.99 1 A/A ADJR Current = –0.5mA, ADJ = 20V, SENSE = +10mV, SHARE+ = 1V 0.96 0.99 1 A/A ADJR Current = –10mA, ADJ = 2.5V, SENSE = +10mV, SHARE+ = 1V 0.96 0.99 1 A/A ADJR Current = –10mA, ADJ = 20V, SENSE = +10mV, SHARE+ = 1V 0.96 0.99 1 A/A ADJ: Current output of adjust amplifier circuit (NPN collector). ADJR: Current adjust amplifier range set (NPN emitter). COMP: Output of error amplifier, input of adjust amplifier. This is where the compensation capacitor is connected. GND: Local power supply return and signal ground. SENSE: Inverting input of current sense amplifier. SHARE+: Positive input from share bus or drive to share bus. SHARE-: Reference for SHARE+. VCC: Local power supply (positive). PIN DESCRIPTIONS |
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Description similaire - UC2902 |
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