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UC3842T Arkusz danych(PDF) 2 Page - STMicroelectronics |
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UC3842T Arkusz danych(HTML) 2 Page - STMicroelectronics |
2 / 15 page * All voltages are with respect to pin 5, all currents are positive into the specified terminal. PIN CONNECTION (top view) COMP VFB ISENSE RT/CT GROUND OUTPUT Vi VREF 1 3 2 4 6 5 7 8 D95IN332 Minidip/SO8 ORDERING NUMBERS SO8 Minidip UC3842TD UC3843TD UC3844TD UC3845TD UC3842TN UC3843TN UC3844TN UC3845TN ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit Vi Supply Voltage (low impedance source) 30 V Vi Supply Voltage (Ii < 30mA) Self Limiting IO Output Current ±1 A EO Output Energy (capacitive load) 5 µJ Analog Inputs (pins 2, 3) – 0.3 to 5.5 V Error Amplifier Output Sink Current 10 mA Ptot Power Dissipation at Tamb ≤ 25 °C (Minidip) 1.25 W Ptot Power Dissipation at Tamb ≤ 25 °C (SO8) 800 mW Tstg Storage Temperature Range – 65 to 150 °C TL Lead Temperature (soldering 10s) 300 °C PIN FUNCTIONS No Function Description 1 COMP This pin is the Error Amplifier output and is made available for loop compensation. 2VFB This is the inverting input of the Error Amplifier. It is normally connected to the switching power supply output through a resistor divider. 3ISENSE A voltage proportional to inductor current is connected to this input. The PWM uses this information to terminate the output switch conduction. 4RT/CT The oscillator frequency and maximum Output duty cycle are programmed by connecting resistor RT to Vref and cpacitor CT to ground. Operation to 500kHz is possible. 5 GROUND This pin is the combined control circuitry and power ground. 6 OUTPUT This output directly drives the gate of a power MOSFET. Peak currents up to 1A are sourced and sunk by this pin. 7VCC This pin is the positive supply of the control IC. 8Vref This is the reference output. It provides charging current for capacitor CT through resistor RT. UC3842T - UC3843T - UC3844T - UC3845T 2/15 |
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Podobny opis - UC3842T |
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