(China (Mainland))
Product Summary
TheUC3842/3/4/5family of controlICs providesthe necessary features to implement off-line or DC to DC fixed frequency current mode control schemes witha minimalexternalparts count.Internallyimplementedcircuitsincludeundervoltagelockoutfeaturing start-up current less than 1 mA, a precisionreference trimmed for accuracy at the erroramp input,logic to insure latched operation, a PWM comparatorwhichalsoprovidescurrentlimit control,anda totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-ChannelMOSFETs, islow in theoff-state. Differencesbetweenmembers of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC3842 and UC3844 have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresholds for the UC3843 and UC3845 are 8.5 V and 7.9 V. The UC3842 and UC3843 can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC3844 and UC3845by the additionof aninternaltoggleflip flop which blanks the output off every other clock cycle.
| Image | Part No | Mfg | Description |  |
Pricing (USD) |
Quantity | ||||||||||||
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 UC2843 |
Other |
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Data Sheet |
Negotiable |
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UC2843A |
Other |
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Data Sheet |
Negotiable |
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UC2843AD1R2G |
ON Semiconductor |
Other Power Management 52kHz 1A Current PWM w/96% Duty Cycle Max |
Data Sheet |
Negotiable |
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UC2843AD8G4 |
Texas Instruments |
Current Mode PWM Controllers Current-Mode PWM Controller |
Data Sheet |
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UC2843AD8TR |
Texas Instruments |
Current Mode PWM Controllers Current-Mode PWM Controller |
Data Sheet |
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UC2843ADG |
ON Semiconductor |
Other Power Management 52kHz 1A Current PWM w/96% Duty Cycle Max |
Data Sheet |
Negotiable |
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UC2843ADG4 |
Texas Instruments |
Current Mode PWM Controllers Current-Mode PWM Controller |
Data Sheet |
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UC2843ADTR |
Texas Instruments |
Current Mode PWM Controllers Current-Mode PWM Controller |
Data Sheet |
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