(China (Mainland))
Product Summary
The UC3842BN is a control IC. The UC3842BN provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockoutfeaturingstart-upcurrent less than 0.5mA, a precision reference trimmed for accuracy at the error ampinput, logicto insurelatchedoperation, a PWM comparatorwhich alsoprovidescurrent limit control, and a totempole output stage designed to source or sink high peakcurrent.The UC3842BN outputstage, suitable for driving N-Channel MOSFETs, is low in the offstate.
Parametrics
UC3842BN absolute maximum ratings: (1)Vi, Supply Voltage (low impedance source): 30 V; (2)Vi, Supply Voltage (Ii < 30mA): Self Limiting; (3)IO, Output Current: ±1 A; (4)EO, Output Energy (capacitive load): 5 mJ; (5)Analog Inputs (pins 2, 3): – 0.3 to 5.5 V; (6)Error Amplifier Output Sink Current: 10 mA; (7)Ptot, Power Dissipation at Tamb 3 25 ℃ (Minidip): 1.25 W; (8)Ptot, Power Dissipation at Tamb 3 25 ℃ (SO8): 800 mW; (9)Tstg, Storage Temperature Range: – 65 to 150 ℃; (10)TJ, Junction Operating Temperature: – 40 to 150 ℃; (11)TL, Lead Temperature (soldering 10s): 300 ℃.
Features
UC3842BN features: (1)trimmed oscillator for precise fre-quency control oscillator frequency guaranteed at 250kHz; (2)current mode operation to 500kHz; (3)automatic feed forward compensation latching pwm for cycle-by-cycle current limiting; (4)internally trimmed reference with undervoltage lockout; (5)high current totempoleoutput undervoltage lockout with hysteresis low start up and operating current.
Diagrams
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 UC3842BN |
STMicroelectronics |
Current Mode PWM Controllers 0.5mA Current Mode |
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UC3842BNG |
ON Semiconductor |
Current Mode PWM Controllers 52kHz 1A Current PWM w/96% Duty Cycle Max |
Data Sheet |
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