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UC2855BDWTR Folha de dados(PDF) 4 Page - Texas Instruments |
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UC2855BDWTR Folha de dados(HTML) 4 Page - Texas Instruments |
4 / 17 page 4 UC2855A/B UC3855A/B ELECTRICAL CHARACTERISTICS:Unless otherwise specified: VCC = 18V, RVS = 23k, CT = 470pF, CI = 150pF, VRMS = 1.5V, IAC = 100 µA, ISENSE = 0V, CAO = 4V, VAOUT= 3.5V, VSENSE = 3V. –40°C to 85°C (UC2855A/B), 0°Cto70°C (UC3855A/B). PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Gate Driver Output Output High Voltage lOUT = −200mA, VCC = 15V 12 12.8 V Output Low Voltage lOUT = 200mA 1 2.2 V Output Low Voltage lOUT = 10mA 300 500 mV Output Low (UVLO) lOUT = 50mA, VCC = 0V 0.9 1.5 V Output RISE/FALL Time CLOAD = 1nF 35 ns Output Peak Current CLOAD = 10nF 0.5 1.5 A ZVT ZVS Threshold 2.3 2.6 2.9 V Input Bias Current V = 2.5V, VCT =0 6 20 µA Propagation Delay Measured at ZVTOUT 100 ns Maximum Pulse Width 400 ns Output High Voltage lOUT = −100mA, VCC = 15V 12 12.8 V Output Low Voltage lOUT = 100mA 1 2.2 V lOUT = 10mA 300 900 mV Output Low (UVLO) lOUT = 50mA, VCC = 0V 0.9 1.5 V Output RISE/FALL Time CLOAD = 1nF 35 ns Output Peak Current CLOAD = 10nF 0.25 0.75 A Current Synthesizer ION to CS Offset VION = 0V 30 50 mV Cl Discharge Current IAC = 50 µA 105 118 140 µA IAC = 500 µA5 µA IAC Offset Voltage 0.3 0.65 1.1 V ION Buffer Slew Rate 10 V/ µs ION Input Bias Current VION =2V 2 15 µA RVS Output Voltage 23k from RVS to GND 2.87 3 3.13 V Note 1: Gain constant (K) = IAC VA V VIMO OUT RMS • • (– . ) () 15 2 at VRMS = 1.5V, VAOUT = 5.5V. PIN DESCRIPTIONS CA This is the inverting input to the current amplifier. Connect the required compensation components be- tween this pin and CAOUT. The common mode operating range for this input is between −0.3V and 5V. CAO: This is the output of the wide bandwidth current amplifier and one of the inputs to the PWM duty cycle comparator. The output signal generated by this amplifier commands the PWM to force the correct input current. The output can swing from 0.1V to 7.5V. CI: The level shifted current sense signal is impressed upon a capacitor connected between this pin and GND. The buffered current sense transformer signal charges the capacitor when the boost switch is on. When the switch is off, the current synthesizer discharges the ca- pacitor at a rate proportional to the dI/dt of the boost in- ductor current. In this way, the discharge current is approximately equal to 3 4 V RRVS IAC – . Discharging the CI capacitor in this fashion, a “recon- structed” version of the inductor current is generated us- ing only one current sense transformer. |
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