Product Summary

The UC1842A/3A/4A/5A family of control ICs is a pin for pin compati-ble improved version of the UC3842/3/4/5 family. Supporting the necessary features to control current mode switched mode powersupplies, this family has the following improved features. Start up current is guaranteed to be less than 0.5mA. Oscillator discharge is trimmed to 8.3mA. During under voltage lockout, the output stagecan sink at least 10mA at less than 1.2V for VCC over 5V.

Parametrics

The absolute maximum ratings of UC2843AD8 are
(1)Supply Voltage (Low Impedance Source): 30V;
(2)Supply Voltage (ICC mA): Self Limiting;
(3)Output Current:.±1A;
(4)Output Energy (Capacitive Load):. 5μJ;
(5)Analog Inputs (Pins 2, 3):. -0.3V to +6.3V;
(6)Error Amp Output Sink Current: 10mA;
(7)Power Dissipation at TA≤ 25°C (DIL-8): 1W;
(8)Storage Temperature Range: -65°C to +150°C;
(9)Lead Temperature (Soldering, 10 Seconds): 300°C

Features

The features of UC2843AD8 can be summarized as
(1)Optimized for Off-line and DC to DC Converters;
(2)Low Start Up Current (<0.5mA);
(3)Trimmed Oscillator Discharge Current;
(4)Automatic Feed Forward Compensation;
(5)Pulse-by-Pulse Current Limiting;
(6)Enhanced Load Response Characteristics;
(7)Under-Voltage Lockout With Hysteresis;
(8)Double Pulse Suppression;
(9)High Current Totem Pole Output;
(10)Internally Trimmed Bandgap Reference;
(11)500kHz Operation;
(12)Low RO Error Amp

Diagrams

<DIV><IMG alt="UC2843AD8 Pin Configuration" src="http://www.seekic.com/uploadfile/ic-mfg/2012711204118214.jpg" border=0></DIV>

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
UC2843AD8
UC2843AD8
Texas Instruments
Current Mode PWM Controllers Current Mode
Data Sheet
0-1: $0.98
1-25: $0.85
25-100: $0.77
100-250: $0.68
UC2843AD8G4
UC2843AD8G4
Texas Instruments
Current Mode PWM Controllers Current-Mode PWM Controller
Data Sheet
0-1: $0.98
1-25: $0.85
25-100: $0.77
100-250: $0.68
UC2843AD8TR
UC2843AD8TR
Texas Instruments
Current Mode PWM Controllers Current-Mode PWM Controller
Data Sheet
0-1: $0.85
1-25: $0.76
25-100: $0.67
100-250: $0.59
UC2843AD8TRG4
UC2843AD8TRG4
Texas Instruments
Current Mode PWM Controllers Current-Mode PWM Controller
Data Sheet
0-1730: $0.40
1730-2000: $0.37
2000-2500: $0.37
2500-5000: $0.36