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TOP201YN Datasheet(PDF) 5 Page - Power Integrations, Inc. |
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TOP201YN Datasheet(HTML) 5 Page - Power Integrations, Inc. |
5 / 16 page D 7/96 TOP200-4/14 5 PI-1119-110194 VIN VOUT 0 IOUT 0 1 2 1 4 3 DRAIN 0 VIN VC 0 ••• ••• 12 12 81 0 IC ••• ••• 12 8 81 2 8 1 VC(reset) 45 mA Shutdown/Auto-restart To minimize TOPSwitch power dissipation, the shutdown/auto-restart circuit turns the power supply on and off at a duty cycle of typically 5% if an out of regulation condition persists. Loss of regulation interrupts the external current into the CONTROL pin. V C regulation changes from shunt mode to the hysteretic auto-restart mode described above. When the fault condition is removed, the power supply output becomes regulated, V C regulation returns to shunt mode, and normal operation of the power supply resumes. Latching Shutdown The output overvoltage protection latch is activated by a high-current pulse into the CONTROL pin. When set, the latch turns off the TOPSwitch output. Activating the power-up reset circuit by removing and restoring input power, or momentarily pulling the CONTROL pin below the power-up reset threshold resets the latch and allows TOPSwitch to resume normal power supply operation. V C is regulated in hysteretic mode when the power supply is latched off. Overtemperature Protection Temperature protection is provided by a precision analog circuit that turns the output MOSFET off when the junction temperature exceeds the thermal shutdown temperature (typically 145 °C). Activating the power-up reset circuit by removing and restoring input power or momentarily pulling the CONTROL pin below the power-up reset threshold resets the latch and allows TOPSwitch to resume normal power supply operation. V C is regulated in hysteretic mode when the power supply is latched off. High-voltage Bias Current Source This current source biases TOPSwitch from the DRAIN pin and charges the CONTROL pin external capacitance (C T) during start-up or hysteretic operation. Hysteretic operation occurs during auto-restart and latched shutdown. The current source is switched on and off with an effective duty cycle of approximately 35%. This duty cycle is determined by the ratio of CONTROL pin charge (I C) and discharge currents (I CD1 and ICD2). This current source is turned off during normal operation when the output MOSFET is switching. Figure 6. Typical Waveforms for (1) Normal Operation, (2) Auto-restart, (3) Latching Shutdown, and (4) Power Down Reset. |
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