(China (Mainland))
Product Summary
The UC3842BN is a controller which 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 lockout featuring start-up current less than 0.5mA, a precision reference trimmed for accuracy at the erroramp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the offstate.
Parametrics
UC3842BN absolute maximum ratings: (1)Supply Voltage (low impedance source): 30 V; (2)Output Current: ±1 A; (3)Output Energy (capacitive load): 5 μJ; (4)Analog Inputs (pins 2, 3): -0.3 to 5.5 V; (5)Error Amplifier Output Sink Current: 10 mA; (6)Power Dissipation: 1.25 W; (7)Power Dissipation: 800 mW; (8)Storage Temperature Range: -65 to 150℃; (9)Junction Operating Temperature: -40 to 150℃; (10)Lead Temperature (soldering 10s): 300℃.
Features
UC3842BN features: (1)trimmed oscillator for precise frequency control; (2)oscilator frequency guaranteed at 250kHz; (3)current mode operation to 500kHz; (4)automatic feed forward compensation; (5)high current totem pole output; (6)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 |
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