(Hong Kong)
Product Summary
The UC3842B series are high performance fixed frequency current mode controllers. They are specifically designed for Off-Line and DC-DC converter applications offering the designer a cost-effective solution with minimal external components. Theseintegrated circuits feature a trimmed oscillator for precise duty cyclecontrol, a temperature compensated reference, high gain erroramplifier, current sensing comparator, and a high current totem poleoutput ideally suited for driving a power MOSFET.
The UCX842B has UVLO thresholds of 16 V (on) and 10 V (off),ideally suited for off-line converters.
Parametrics
The absolute maximum ratings of UC2843BD1G are
(1)Bias and Driver Voltages (Zero Series Impedance, see also Total Device spec)VCC, VC:30V;
(2)Total Power Supply and Zener Current(ICC + IZ):30mA;
(3)Output Current, Source or SinkIO:1.0A;
(4)Output Energy (Capacitive Load per Cycle)W:5.0mJ;
(5)Current Sense and Voltage Feedback InputsVin :0.3 to + 5.5V;
(6)Error Amp Output Sink CurrentIO:10mA
Features
The features of UC2843BD1G can be summarized as
(1)Trimmed Oscillator for Precise Frequency Control;
(2)Oscillator Frequency Guaranteed at 250 kHz;
(3)Current Mode Operation to 500 kHz;
(4)Automatic Feed Forward Compensation;
(5)Latching PWM for Cycle-By-Cycle Current Limiting;
(6)Internally Trimmed Reference with Undervoltage Lockout;
(7)High Current Totem Pole Output;
(8)Undervoltage Lockout with Hysteresis;
(9)Low Startup and Operating Current;
(10)Pb-Free Packages are Available
Diagrams
<DIV><IMG alt="UC2843BD1G Pin Configuration" src="http://www.seekic.com/uploadfile/ic-mfg/2012711203340321.jpg" border=0></DIV>
| Image | Part No | Mfg | Description |  |
Pricing (USD) |
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 UC2843BD1G |
ON Semiconductor |
Current Mode PWM Controllers 52kHz 1A Current PWM w/96% Duty Cycle Max |
Data Sheet |
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