(China (Mainland))
Product Summary
The UC2845N is a high performance fixed frequency current mode controller. It is specifically designed for Off–Line and dc–to–dc converter applications offering the designer a cost effective solution with minimal external components. These integrated circuits of UC2845N feature 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
UC2845N absolute maximum ratings: (1)Total Power Supply and Zener Current: 30 mA; (2)Output Current, Source or Sink: 1.0 A; (3)Output Energy (Capacitive Load per Cycle): 5.0 mJ; (4)Current Sense and Voltage Feedback Inputs: – 0.3 to + 5.5 V; (5)Error Amp Output Sink Current: 10 mA; (6)Power Dissipation and Thermal Characteristics: D Suffix, Plastic Package, Case 751A, Maximum Power Dissipation @ TA = 25℃: 862 mW, N Suffix, Plastic Package, Case 626, Maximum Power Dissipation @ TA = 25℃: 1.25 W; (7)Operating Junction Temperature: + 150 ℃; (8)Operating Ambient Temperature: 0 to + 70 ℃; (9)Storage Temperature Range: – 65 to + 150 ℃.
Features
UC2845N 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 Cycle-By-Cycle 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 Motorola SENSEFET Products.
Diagrams
| Image | Part No | Mfg | Description |  |
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 UC2845NG4 |
Texas Instruments |
Current Mode PWM Controllers Current-Mode PWM Controller |
Data Sheet |
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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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UC2845N |
Texas Instruments |
Current Mode PWM Controllers Current Mode |
Data Sheet |
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