(China (Mainland))
Product Summary
The UC2845NG is a high performance fixed frequency current mode controller. The UC2845NG is specifically designed for OffLine and DCtoDC converter applications offering the designer a costeffective solution with minimal external components. The UC2845NG features an oscillator, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET.
Parametrics
UC2845NG absolute maximum ratings: (1) Total Power Supply and Zener Current (Icc+IZ) : 30mA; (2) Output Current, Source or Sink IO: 1A; (3) Output Energy (Capacitive Load per Cycle) : 5μJ; (4) Current Sense and Voltage Feedback Inputs Vin: -0.3 to +5.5V; (5) Error Amp Output Sink Current Io: 10mA; (6) Power Dissipation and Thermal Characteristics PD: 862mW; (7) Operating Junction Temperature Tj: +150°C; (8) Operating Ambient Temperature TA: -25 to +85°C; (9) Storage Temperature Range Tstg: -65 to +150°C.
Features
UC2845NG features: (1) Current Mode Operation to 500 kHz Output Switching Frequency; (2) Output Deadtime Adjustable from 50% to 70%; (3) Automatic Feed Forward Compensation; (4) Latching PWM for CycleByCycle Current Limiting; (5) Internally Trimmed Reference with Undervoltage Lockout; (6) High Current Totem Pole Output; (7) Input Undervoltage Lockout with Hysteresis; (8) Low Startup and Operating Current; (9) Direct Interface with ON Semiconductor SENSEFET Products; (10) PbFree Packages are Available.
Diagrams
| Image | Part No | Mfg | Description |  |
Pricing (USD) |
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 UC2845NG |
ON Semiconductor |
Other Power Management 52kHz 1A Current PWM w/48% Duty Cycle Max |
Data Sheet |
Negotiable |
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UC2845NG4 |
Texas Instruments |
Current Mode PWM Controllers Current-Mode PWM Controller |
Data Sheet |
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