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UC3842A-BW Fiches technique(PDF) 1 Page - First Components International |
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UC3842A-BW Fiches technique(HTML) 1 Page - First Components International |
1 / 10 page 1 PIN CONNECTION (TOP VIEW) DESCRIPTION The UC3842A-BW/43A-BW/44A-BW/45A-BW are fixed frequency current mode PWM controller. They are specially designed for OFF −Line and DC to DC converter applications with a minimal external components. Internally implemented circuits include a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totempole output ideally suited for driving a power MOSFET. Protection circuitry includes built undervoltage lockout and current limiting. The UC3842A-BW and UC3844A-BW have UVLO thresholds of 16 V (on) and 10 V (off). The corresponding thresholds for the UC3843A-BW/45A-BW are 8.4V (on) and 7.6V (off). The UC3842A-BW and UC3843A-BW can operate within 100% duty cycle. The UC3844A-BW and UC3845A-BW can operate within 50% duty cycle. The UC384XA-BW has Start-Up Current 0.17mA (typ). The UC384XA-BW are revised UC384XAM and differ by higher Unity Gain bandwidth of Error Amplifier. FEATURES • Low Start-Up and Operating Current • High Current Totem Pole Output • Undervoltage Lockout With Hysteresis • Operating Frequency Up To 500KHz BLOCK DIAGRAM (toggle flip flop used only in UC3844, UC3845) Absolute Maximum Ratings Characteristic Symbol Value Unit Supply Voltage (low impedance source) VCC 30 V Output Current IO ±1 A Input Voltage (Analog Inputs pins 2,3) VI −0.3 to 5.5 V Error Amp Output Sink Current ISINK (E.A) 10 mA Power Dissipation (TA=250C) PO 1 W Storage Temperature Range Tstg -65 to150 oC Lead Temperature (soldering 5 sec.) TL 260 oC UC384XA-BW Current Mode PWM Controller (UC3842A-BW/43A-BW/44A-BW/45A-BW) |
Numéro de pièce similaire - UC3842A-BW |
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Description similaire - UC3842A-BW |
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