PRINCIPLES OF OPERATION AND TYPICAL CHARACTERISTICS

Output Saturation Characteristics

For single ended supplies, the driver outputs are

grounded. The VC terminal is switched to ground by the

totem-pole source transistors on alternate oscillator cycles.

In conventional push-pull bipolar designs, forward base

drive is controlled by R1-R3. Rapid turn-off times for the

power devices are acheived with speed-up capacitors C,

and C2.

Output Circuit (½ Circuit Shown)

The low source impedance of the output drivers provides

rapid charging of power FET input capacitance while

minimizing external components.

Low power transformers can be driven directly by the

UC1525B. Automatic reset occurs during dead time, when

both ends of the primary winding are switched to ground.

UC1525B-SP

6

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