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NX2A4WP_SDS Datasheet(PDF) 8 Page - NXP Semiconductors |
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NX2A4WP_SDS Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 44 page NX2A4WP_SDS All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved. Product short data sheet Rev. 3 — 4 August 2015 8 of 44 NXP Semiconductors NX2A4WP High frequency wireless charging receiver front end 7.1.2 Automatic over-voltage protection Sudden jumps in the voltage or energy transmitted to a receiver can occur when other receivers are switched in and out of the common radiation field of a single transmitter. There are two alternative mechanisms available for over-voltage protection of the AC-input pins (AC1 and AC2). The automatic frequency over-power protection method is described above in Section 7.1.1, and the other option, the AC-clamp, is described in this section. For details see Figure 3, Figure 6 and Figure 7. The automatic over-voltage protection shorts both AC-input pins directly to ground when the rectifier output voltage (VO(rect)) exceeds the over-voltage protection limit (Vovp(en)). When the over-voltage takes place, the energy stays in the resonator circuit. In this way, the rectifier voltage stops from rising any further. When the rectifier voltage drops below the over-voltage protection limit (Vovp(dis)) the shorts are removed and the rectifier returns to normal operation. Fig 6. Flow diagram of automatic over-power protection RESET OVD = ‘0’ OVDIE = ‘0’ GPIO1 = ‘1’ GPIO2 = ‘1’ VO(rect) > Vovd(en) GPIO1 = ‘0’ GPIO2 = ‘0’ OVD = ‘1’ N N N Y Y Positive Edge GPIO1 = ‘1’ GPIO2 = ‘1’ Y VO(rect) < Vovd(dis) aaa-018657 OVD = over-power protection flag bit (ASYN SET TO ‘1’) OVDIE = interrupt enable bit GPIO1 = GPIO1 OPEN-DRAIN PIN GPIO2 = GPIO2 OPEN-DRAIN PIN VO(rect) = voltage on pin LDRECT |
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