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LD9162KGS Datasheet(PDF) 13 Page - Leadtrend Technology |
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LD9162KGS Datasheet(HTML) 13 Page - Leadtrend Technology |
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13 / 17 page  LD9162K 03/10/2021 13 Leadtrend Technology Corporation www.leadtrend.com.tw LD9162K-DS-00 March 2021 Fig. 18 OVP (Over Voltage Protection) on VCC – Auto Recovery LD9162K is implemented with OVP function over VCC. As the VCC voltage rises over the OVP threshold voltage, the output drive circuit will be shutdown simultaneously to stop the switching of the power MOS until the next UVLO (on) arrives. The VCC OVP function of LD9162K is an auto-recovery type protection. The Fig. 19 shows its operation. On the other hand, if the OVP condition is removed, the VCC level will get back to normal level and the output will automatically return to the normal operation. Fig. 19 Brown-In/ Brown-Out Protection (BNI/BNO) and Bulk Cap OVP – Auto Recovery The LD9162K integrates the brown in, brownout protection and valley detection into FB pin. The auxiliary voltage reflects a proportional bulk voltage during the on time. Fix the internal current at the BNI, BNO and BULK_OVP, the BNI level could be set by modulating the FB divided resistors and auxiliary voltage, as shown in Fig. 13. For preventing the abnormal condition of line voltage to causing damage, BNO function is implemented, while turns off the gate signal after de-bounce time 70ms as BNO occurring, as shown in Fig. 20. The BULK_OVP is implemented as shown in Fig. 21. The gate signal will be turned off after de-bounce time 450ms, while IBULK_OVP is tripped. If VBULK over VDC_BULK_OVP before start up then de-bounce time is 5ms. The relationship of input voltage and BNI/BNO and BULK_OVP is as follows. VDC_BNI = NP Na ∙ IBNI ∙ Ra VDC_BNO = NP Na ∙ IBNO ∙ Ra VDC_BULK_OVP = NP Na ∙ IBULK_OVP ∙ Ra VCC UVLO(on) UVLO(off) t t VCS OLP t Drain OLP delay time Switching Switching Non-Switching OLP trip Level UVLO(off) OLP Reset VCC UVLO(on) UVLO(off) t OVP Tripped t Drain Switching Switching Non-Switching OVP Level |
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