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UC2854A Fiches technique(PDF) 5 Page - Texas Instruments |
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UC2854A Fiches technique(HTML) 5 Page - Texas Instruments |
5 / 7 page offset of the UC1854A/B guarantees that the PWM circuit will not drive the MOSFET if the current command is zero (both Current amplifier inputs zero.).Previous designs required an external offset cancellation network to implement this key feature. The bandwidth of the Current Amplifier has been improved as well to 5mHz typical. While this is not generally an issue at 50 or 60Hz inputs, it is essential for 400Hz input avionics applications. MISCELLANEOUS Several other important enhancements have been implemented in the UC1854A/B. A VCC supply voltage clamp at 20V allows the controller to be current fed if desired. The lower startup supply current (250 µA typical), substantially reduces the power requirements of an offline startup resistor. The 10.5/10V UVLO option (UC1854B) enables the controller to be powered off of an auxiliary 12V supply. The VREF "GOOD" comparator guarantees that the MOSFET driver output remains low if the supply or the 7.5V reference are not yet up. This improvement eliminates the need for external Schottky diodes on the PKL and CA+ pins that some UC1854 designs require. The propagation delay of the disable feature has been improved to 300ns typical. This delay was proportional to FUNCTIONAL DESCRIPTION (cont.) UC1854A/B UC2854A/B UC3854A/B TYPICAL CHARACTERISTICS at TA = TJ = 25°C Load Capacitance, µF ns 0 100 200 300 400 500 600 700 0 0.01 0.02 0.03 0.04 0.05 Rise Time Fall Time Gate Drive Rise and Fall Time RSET, k Ω Duty Cycle 70% 75% 80% 85% 90% 95% 100% 1 10 100 Gate Drive Maximum Duty Cycle 0 50 100 150 200 250 0.8 0.84 0.88 0.92 0.96 1 1.04 1.08 1.12 1.16 1.2 K IAC Current ( µA) VRMS= 1.5V VRMS= 3.0V VRMS= 5.0V UC1854A/B Multiplier Linearity VAOUT = 3.5V 0 50 100 150 200 250 0.8 0.84 0.88 0.92 0.96 1 1.04 1.08 1.12 1.16 1.2 K IAC Current ( µA) VRMS= 3.0V VRMS= 1.5V VRMS= 5.0V UC1854A/B Multiplier Linearity VAOUT = 5V 5 |
Numéro de pièce similaire - UC2854A |
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Description similaire - UC2854A |
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