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TOP201YAI Datasheet(PDF) 3 Page - Power Integrations, Inc. |
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TOP201YAI Datasheet(HTML) 3 Page - Power Integrations, Inc. |
3 / 16 page D 7/96 TOP200-4/14 3 TOPSwitch Family Functional Description TOPSwitch is a self biased and protected linear control current-to-duty cycle converter with an open drain output. High efficiency is achieved through the use of CMOS and integration of the maximum number of functions possible. CMOS significantly reduces bias currents as compared to bipolar or discrete solutions. Integration eliminates external power resistors used for current sensing and/or supplying initial start-up bias current. During normal operation, the internal output MOSFET duty cycle linearly decreases with increasing CONTROL pin current as shown in Figure 4. To implement all the required control, bias, and protection functions, the DRAIN and CONTROL pins each perform several functions as described below. Refer to Figure 2 for a block diagram and Figure 6 for timing and voltage waveforms of the TOPSwitch integrated circuit. Control Voltage Supply CONTROL pin voltage V C is the supply or bias voltage for the controller and driver circuitry. An external bypass capacitor closely connected between the CONTROL and SOURCE pins is required to supply the gate drive current. The total amount of capacitance connected to this pin (C T) also sets the auto-restart timing as well as control loop compensation. V C is regulated in either of two modes of operation. Hysteretic regulation is used for initial start-up and overload operation. Shunt regulation is used to separate the duty cycle error signal from the control circuit supply current. During start-up, V C current is supplied from a high-voltage switched current source connected internally between the DRAIN and CONTROL pins. The current source provides sufficient current to supply the control circuitry as well as charge the total external capacitance (C T). PI-1691-112895 DMAX DMIN ICD1 IC (mA) 2.5 6.5 45 Slope = PWM Gain -16%/mA IB Auto-restart Figure 4. Relationship of Duty Cycle to CONTROL Pin Current. Figure 5. Start-up Waveforms for (a) Normal Operation and (b) Auto-restart. DRAIN 0 VIN VC 0 4.7 V 5.7 V 8 Cycles 95% 5% Off Switching Switching Off IC Charging CT ICD1 Discharging CT ICD2 Discharging CT IC Charging CT Off PI-1124A-060694 DRAIN 0 VIN VC 0 4.7 V 5.7 V Off Switching (b) (a) CT is the total external capacitance connected to the CONTROL pin |
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