(China (Mainland))
Product Summary
The UC3845D is a high performance fixed frequency current mode controller. The device is specifically designed for Off–Line and dc–to–dc converter applications offering the designer a cost effective solution with minimal external components. The UC3845D 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
UC3845D absolute maximum ratings: (1)Total Power Supply and Zener Current, (ICC + IZ): 30 mA; (2)Output Current, Source or Sink (Note 1), IO: 1.0 A; (3)Output Energy (Capacitive Load per Cycle), W: 5.0 mJ; (4)Current Sense and Voltage Feedback Inputs, Vin: -0.3 to + 5.5 V; (5)Error Amp Output Sink Current, IO: 10 mA; (6)Operating Junction Temperature, TJ: + 150℃; (7)Operating Ambient Temperature, TA: 0 to + 70℃; (8)Storage Temperature Range, Tstg: -65 to + 150℃.
Features
UC3845D 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 |  |
Pricing (USD) |
Quantity | ||||||||||||
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 UC3845D |
Texas Instruments |
Current Mode PWM Controllers Current Mode |
Data Sheet |
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UC3845D1X |
Fairchild Semiconductor |
Current Mode PWM Controllers Current Mode PWM Control IC |
Data Sheet |
Negotiable |
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UC3845D8 |
Texas Instruments |
Current Mode PWM Controllers Current Mode |
Data Sheet |
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UC3845D8G4 |
Texas Instruments |
Current Mode PWM Controllers Current Mode |
Data Sheet |
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UC3845DG |
ON Semiconductor |
Other Power Management 52kHz 1A Current PWM w/48% Duty Cycle Max |
Data Sheet |
Negotiable |
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UC3845DG4 |
Texas Instruments |
Current Mode PWM Controllers Current-Mode PWM Controller |
Data Sheet |
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UC3845DR2 |
ON Semiconductor |
Other Power Management 52kHz 1A Current PWM |
Data Sheet |
Negotiable |
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UC3845DTRG4 |
Texas Instruments |
Current Mode PWM Controllers Current-Mode PWM Controller |
Data Sheet |
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