(China (Mainland))
Product Summary
The UC3843B is a control IC which provides thenecessary features to implement off-line or DC to DC fixed frequencycurrent mode control schemes with a minimal external parts count. Internally implemented circuits includea trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5mA,a precision reference trimmed for accuracy at the error amp input,logicto insurelatchedoperation,a PWM comparatorwhich alsoprovidescurrentlimit control, and a totem pole output stage designed to source or sink high peakcurrent.Theoutputstage,suitable for driving N-Channel MOSFETs, is low in the offstate.
Parametrics
UC3843B absolute maximum ratings: (1)Supply Voltage (low impedance source): 30 V; (2)Output Current: ±1 A; (3)EO Output Energy (capacitive load): 5μJ; (4)Analog Inputs (pins 2, 3): – 0.3 to 5.5 V; (5)Amplifier Output Sink Current: 10 mA; (6)Storage Temperature Range: – 65 to 150℃; (7)Junction Operating Temperature: – 40 to 150℃; (8)Lead Temperature (soldering 10s): 300℃.
Features
UC3843B features: trimmed oscillator for precise frequency control; (2)oscillator frequency guaranteed at 250kHz; (3)current mode operation to 500kHz; (4)automatic feed forward compensation; (5)latching PWM for cycle-by-cycle current limiting; (6)low start-up and operating current.
Diagrams
| Image | Part No | Mfg | Description |  |
Pricing (USD) |
Quantity | ||||||||||||
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 UC3843BD1R2G |
ON Semiconductor |
Current Mode PWM Controllers 52kHz 1A Current PWM w/96% Duty Cycle Max |
Data Sheet |
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UC3843BDG |
ON Semiconductor |
Current Mode PWM Controllers ANA SMPS PWM CNTRL |
Data Sheet |
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UC3843BVD |
ON Semiconductor |
Current Mode PWM Controllers 52kHz 1A Current PWM |
Data Sheet |
Negotiable |
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UC3843BVD1 |
ON Semiconductor |
Current Mode PWM Controllers 52kHz 1A Current PWM |
Data Sheet |
Negotiable |
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UC3843BVD1R2 |
ON Semiconductor |
Current Mode PWM Controllers 52kHz 1A Current PWM |
Data Sheet |
Negotiable |
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UC3843BVD1R2G |
ON Semiconductor |
Current Mode PWM Controllers 52kHz 1A Current PWM w/96% Duty Cycle Max |
Data Sheet |
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UC3843BVDG |
ON Semiconductor |
Current Mode PWM Controllers ANA SMPS PWM CNTRLLR |
Data Sheet |
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UC3843BVD1G |
ON Semiconductor |
Current Mode PWM Controllers 52kHz 1A Current PWM w/96% Duty Cycle Max |
Data Sheet |
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