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TOP221YN Datasheet(PDF) 3 Page - Power Integrations, Inc. |
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TOP221YN Datasheet(HTML) 3 Page - Power Integrations, Inc. |
3 / 21 page TOP221-227 D 7/01 3 TOPSwitch-II 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 process 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 duty cycle of the internal output MOSFET decreases linearly 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 to Figure 6 for timing and voltage waveforms of the TOPSwitch integrated circuit. PI-2040-050197 DMAX DMIN IC (mA) 2.0 6.0 Slope = PWM Gain IB ICD1 Auto-restart Figure 4. Relationship of Duty Cycle to CONTROL Pin Current. 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-1956-092496 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 Figure 5. Start-up Waveforms for (a) Normal Operation and (b) Auto-restart. |
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