Product Summary
The UC3842BD is a high performance fixed frequency current mode controller. They are 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 feature a trimmed oscillator for precise duty cycle control, 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. The UC3842BD has UVLO thresholds of 16 V (on) and 10 V (off), ideally suited for off–line converters.
Parametrics
UC3842BD absolute maximum ratings: (1)Total Power Supply and Zener Current: 30 mA; (2)Output Current, Source or Sink (Note 1): 1.0 A; (3)Output Energy (Capacitive Load per Cycle): 5.0 μJ; (4)Current Sense and Voltage Feedback Inputs: -0.3 to + 5.5 V; (5)Error Amp Output Sink Current: 10 mA.
Features
UC3842BD features: (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.
Diagrams
Image | Part No | Mfg | Description | Pricing (USD) |
Quantity | |||||||||||||
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UC3842BD |
ON Semiconductor |
Current Mode PWM Controllers 52kHz 1A Current PWM |
Data Sheet |
Negotiable |
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UC3842BD1 |
STMicroelectronics |
Current Mode PWM Controllers PWM CONTROLLER |
Data Sheet |
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UC3842BD1013TR |
STMicroelectronics |
Current Mode PWM Controllers 0.5mA Current Mode |
Data Sheet |
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UC3842BD1G |
ON Semiconductor |
Current Mode PWM Controllers 52kHz 1A Current PWM w/96% Duty Cycle Max |
Data Sheet |
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UC3842BD1R2 |
ON Semiconductor |
Current Mode PWM Controllers 52kHz 1A Current PWM |
Data Sheet |
Negotiable |
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UC3842BD1R2G |
ON Semiconductor |
Current Mode PWM Controllers 52kHz 1A Current PWM w/96% Duty Cycle Max |
Data Sheet |
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UC3842BDG |
ON Semiconductor |
Current Mode PWM Controllers 52kHz 1A Current PWM w/96% Duty Cycle Max |
Data Sheet |
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UC3842BDR2 |
ON Semiconductor |
Current Mode PWM Controllers 52kHz 1A Current PWM |
Data Sheet |
Negotiable |
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