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UC2845A Fiches technique(PDF) 2 Page - STMicroelectronics |
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UC2845A Fiches technique(HTML) 2 Page - STMicroelectronics |
2 / 15 page * All voltages are with respect to pin 5, all currents arepositive 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 UC2842AD1; UC3842AD1 UC2843AD1; UC3843AD1 UC2844AD1; UC3844AD1 UC2845AD1; UC3845AD1 UC2842AN; UC3842AN UC2843AN; UC3843AN UC2844AN; UC3844AN UC2845AN; UC3845AN ABSOLUTE MAXIMUM RATINGS Symbol Parameter Valu e Un it 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 TJ Junction Operating Temperature – 40 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. UC2842A/3A/4A/5A - UC3842A/3A/4A/5A 2/15 |
Numéro de pièce similaire - UC2845A |
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Description similaire - UC2845A |
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