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SEN012 Datasheet(PDF) 4 Page - Power Integrations, Inc. |
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SEN012 Datasheet(HTML) 4 Page - Power Integrations, Inc. |
4 / 8 page Rev. B 11/05/10 4 SEN012-013 www.powerint.com Application Example SENZero in PFC Bus Voltage Feedback Network Commercial PFC IC’s typically has a pin dedicated for sensing the output voltage of the PFC Stage. The information on this pin is typically used by the PFC IC for various major functions. 1. Output regulation – input to the non-inverting input of the error amplifier 2. OVP detection - input to the OVP comparator 3. Open loop protection – used to detect open loop conditions The last 2 functions were used for protecting the bus from overvoltage condition. Figure 10. PFC Bus Voltage Sense Network. The SENZero objective is to eliminate the losses associated with the sense resistors without affecting the functionality of the circuit. To keep the operation of the PFC IC unaffected, SENZero and PFC on and off event must follow the required timing sequence during power-up, power-down, remote-on, and remote-off event. PI-6203-102510 Error Amplifier OLP R1 R2 R3 RFB CBULK PFC VOUT OVP FB PFC IC SENZero Switch ON ON OFF OFF OFF OFF VCC SENZero PFC PI-6205-102510 ON ON ON OFF OFF OFF OFF OFF OFF PS(ON) SENZero PFC PI-6206-102510 Figure 11. Timing between PFC IC and SENZzero during Power-up and Power-Down. In case of shared VCC Connection, it must be ensure that SENZero have a lower turn-on and turn-off threshold voltage compared to the PFC IC. Figure 12. Timing between PFC IC and SENZero with PS (ON) Signal. From off-state to on-state, SENZero must turn-on ahead of the PFC. From on-state to off-state, PFC must shutdown ahead of the SENZero. This is to ensure that whenever PFC is operating (switching), SENZero is invincible to the PFC. SENZero only disconnects the sense resistors when PFC is in off-condition and thus eliminates its associated losses during standby condition. |
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