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MC33025PG Fiches technique(PDF) 10 Page - ON Semiconductor |
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MC33025PG Fiches technique(HTML) 10 Page - ON Semiconductor |
10 / 20 page MC34025, MC33025 http://onsemi.com 10 PIN FUNCTION DESCRIPTION Pin No. Function Description DIP/SOIC 1 Error Amp Inverting Input This pin is usually used for feedback from the output of the power supply. 2 Error Amp Noninverting Input This pin is used to provide a reference in which an error signal can be produced on the output of the error amp. Usually this is connected to Vref, however an external reference can also be used. 3 Error Amp Output This pin is provided for compensating the error amp for poles and zeros encountered in the power supply system, mostly the output LC filter. 4 Clock This is a bidirectional pin used for synchronization. 5 RT The value of RT sets the charge current through timing Capacitor, CT. 6 CT In conjunction with RT, the timing Capacitor sets the switching frequency. Because this part is a push−pull output, each output runs at one−half the frequency set at this pin. 7 Ramp Input For voltage mode operation this pin is connected to CT. For current mode operation this pin is connected through a filter to the current sensing element. 8 Soft−Start A capacitor at this pin sets the Soft−Start time. 9 Current Limit/Shutdown This pin has two functions. First, it provides cycle−by−cycle current limiting. Second, if the current is excessive, this pin will reinitiate a Soft−Start cycle. 10 Ground This pin is the ground for the control circuitry. 11 Output A This is a high current totem pole output. 12 Power Ground This 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. 13 VC This is a separate power source connection for the outputs that is connected back to the power source input. With a separate power source connection, it can reduce the effects of switching transient noise on the control circuitry. 14 Output B This is a high current totem pole output. 15 VCC This pin is the positive supply of the control IC. 16 Vref This is a 5.1 V reference. It is usually connected to the noninverting input of the error amplifier. Output Voltage Feedback Input 2 1 3 7 6 5 4 1.25 V Oscillator Vref CT Figure 22. Voltage Mode Operation In voltage mode operation, the control range on the output of the Error Amplifier from 0% to 90% duty cycle is from 2.25 V to 4.05 V. Output Voltage Feedback Input 2 1 3 7 6 5 4 1.25 V Oscillator Vref CT From Current Sense Element Figure 23. Current Mode Operation In current mode control, an RC filter should be placed at the ramp input to filter the leading edge spike caused by turn−on of a power MOSFET. |
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