UC3843D1

Operating Supply Voltage :
Operating Supply Current :
Number of Outputs : 1
Mounting Style : SMD/SMT
Fall Time : 35 ns
Switching Frequency : 500 KHz
Duty Cycle (Max) : 100 %
Maximum Operating Temperature : + 70 C
Rise Time : 45 ns
Package / Case : SOP-8


Description

The UC3843D1 is designed as fixed frequencycurrent-mode PWM controller. They are specially designed for Off-Line and DC to DC converter applications with minimum external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control. A temperature compensated reference, high gain error amplifier, current sensing comparator and a high current totempole output for driving a power MOSFET.

UC3843D1 has four features. (1) Low start up current. (2) Maximum duty clamp. (3) UVLO with hysteresis. (4) Operating frequency up to 500KHz. That are all the main features.

Some absolute maximum ratings of UC3843D1 have been concluded into several points as follow. (1) Its supply voltage would be 30V. (2) Its output current would be ±1A. (3) Its analog inputs would be from -0.3 to 6.3V. (4) Its error amp output sink current would be 10mA. (5) Its power dissipation at Ta25°C (8DIP) would be 1200mW. (6) Its power dissipation at Ta25°C (8SOP) would be 460mW. (7) Its power dissipation at Ta25°C (14SOP) would be 680mW. (8) Its storage temperature range would be from -65 to +150°C. (9) Its lead temperature (soldering, 10sec) 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 about UC3843D1. (1) Its reference output voltage would be min 4.9V and typ 5.0V and max 5.1V. (2) Its line regulation would be typ 6mV and max 20mV. (3) Its load regulation would be typ 6mV and max 25mV. (4) Its short circuit output current would be typ -100mA and max -180mA. (5) Its oscillation frequency would be min 47kHz and typ 52kHz and max 57kHz. And so on. If you have any question or suggestion or want to know more information please contact us for details. Thank you!