UC1823B

The UC1823B is designed as one kind of high speed PWM control ICs. Performance enhancements have been made to several of the circuit blocks. Error amplifier gain bandwidth product is 12MHz while input offset voltage is 2mV. Current limit threshold is guaranteed to a tolerance of 5%.

UC1823B has nine features. (1)Improved versions of the UC3823/UC3825 PWMs. (2)Compatible with voltage or current-mode topologies. (3)Practical operation at switching frequencies to 1MHz. (4)50ns propagation delay to output. (5)High current dual totem pole outputs (2A peak). (6)Trimmed oscillator discharge current. (7)Low 100mA startup current. (8)Pulse-by-pulse current limiting comparator. (9)Latched overcurrent comparator with full cycle restart. Those are all the main features.

Some absolute maximum ratings of UC1823B have been concluded into several points as follow. (1)Its supply voltage would be 22V. (2)Its output current, source or sink (pins OUTA, OUTB) would be 0.5A for DC and would be 2.2A for pulse 0.5us. (3)Its power ground PGND would be +/-0.2V. (4)Its analog inputs would be from -0.3V to 7V for INV, NI, RAMP and would be from -0.3V to 6V for ILIM, SS. (5)Its clock output current (CLK/LEB) would be -5mA. (6)Its error amplifier output current would be 5mA. (7)Its soft start sink current would be 20mA. (8)Oscillator charging current would be -5mA. (9)Its power dissipation would be 1W at Ta=60°C. (10)Its storage temperature range would be from -65°C to 150°C. (11)Its junction temperature range would be from -55°C to 150°C. (12)Its lead temperature (soldering 10 seconds) would be 300°C. It should be noted that stresses above those listed in absolute maximum ratings may cause permanent damage to device.

Also some electrical characteristics of UC1823B are concluded as follow. (1)Its output voltage would be min 5.05V and typ 5.1V and max 5.15V. (2)Its line regulation would be typ 2mV and max 15mV. (3)Its load regulation would be typ 5mV and max 20mV. And so on. If you have any question or suggestion or want to know more information please contact us for details. Thank you!