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UC284xBDR2G Fiches technique(PDF) 6 Page - ON Semiconductor |
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UC284xBDR2G Fiches technique(HTML) 6 Page - ON Semiconductor |
6 / 19 page ![]() UC3844B, UC3845B, UC2844B, UC2845B http://onsemi.com 6 Sink Saturation (Load to VCC) RT = 10 k CT = 3.3 nF VFB = 0 V ISense = 0 V TA = 25°C 0 0 VCC, SUPPLY VOLTAGE (V) 10 20 30 40 5 10 15 20 25 Figure 12. Output Saturation Voltage versus Load Current Figure 13. Output Waveform TA = 25°C TA = -55°C VCC VCC = 15 V 80 ms Pulsed Load 120 Hz Rate TA = -55°C TA = 25°C 0 800 0 I O, OUTPUT LOAD CURRENT (mA) 200 400 600 1.0 2.0 3.0 -2.0 -1.0 0 Source Saturation (Load to Ground) GND 50 ns/DIV 90 % 10 % VCC = 15 V CL = 1.0 nF TA = 25°C 100 ns/DIV VCC = 30 V CL = 15 pF TA = 25°C Figure 14. Output Cross Conduction Figure 15. Supply Current versus Supply Voltage PIN FUNCTION DESCRIPTION Pin Function Description 8−Pin 14−Pin 1 1 Compensation This pin is the Error Amplifier output and is made available for loop compensation. 2 3 Voltage Feedback This is the inverting input of the Error Amplifier. It is normally connected to the switching power supply output through a resistor divider. 3 5 Current Sense A voltage proportional to inductor current is connected to this input. The PWM uses this information to terminate the output switch conduction. 4 7 RT/CT The Oscillator frequency and maximum Output duty cycle are programmed by connecting resistor RT to Vref and capacitor CT to ground. Oscillator operation to 1.0 kHz is possible. 5 GND This pin is the combined control circuitry and power ground. 6 10 Output This output directly drives the gate of a power MOSFET. Peak currents up to 1.0 A are sourced and sunk by this pin. The output switches at one−half the oscillator frequency. 7 12 VCC This pin is the positive supply of the control IC. 8 14 Vref This is the reference output. It provides charging current for capacitor CT through resistor RT. 8 Power Ground This pin is a separate power ground return that is connected back to the power source. It is used to reduce the effects of switching transient noise on the control circuitry. 11 VC The Output high state (VOH) is set by the voltage applied to this pin. With a separate power source connection, it can reduce the effects of switching transient noise on the control circuitry. 9 GND This pin is the control circuitry ground return and is connected back to the powersource ground. 2,4,6,13 NC No connection. These pins are not internally connected. |
Numéro de pièce similaire - UC284xBDR2G |
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Description similaire - UC284xBDR2G |
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