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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LD9535T датащи(PDF) 13 Page - Leadtrend Technology |
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LD9535T датащи(HTML) 13 Page - Leadtrend Technology |
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13 / 16 page  LD9535T 04/08/2021 13 Leadtrend Technology Corporation www.leadtrend.com.tw LD9535T-DS-00 April 2021 Fig. 17 Over Voltage Protection on FB Pin (FB OVP) – Auto Recovery An output overvoltage protection is implemented in the LD9535T. The auxiliary winding voltage can be reflected from secondary winding, in which the FB pin voltage is proportional to output voltage during the gate off time. OVP is worked by sensing the auxiliary voltage via the divided resistors R2, refereeing to Fig. 18. The equation of FB OVP is shown as follows. R2 R1 ∙VFB_OVP Va VFB_OVP Va Na NS VO VF VFB_OVP is the FB pin OVP trip voltage level. Va is the auxiliary winding voltage which reflects from the forward voltage VF of Schottky diode and output voltage VO. NS is turns ration of secondary-side winding. If VFB overs the FB OVP trip level, the internal counter starts counting 8 cycles, and then LD9535T goes to auto-recovery protection mode till the FB OVP status is defused. Fig. 18 Under Voltage Protection 1 on FB Pin (FB UVP 1) – Auto Recovery The FB UVP 1 function can prevent the damage from output short circuit. Once the output is shorted, Vo drop immediately. According to the close loop control, COMP voltage will pull high in the meanwhile. Therefore, as VFB is lower than FB UVP trip level during gate off region and VCOMP pulls higher than 2.8V over 8 cycles, then the FB UVP 1 will be activated to stop the switching of the power MOSFET until the next UVLO(on). The Fig. 19 shows its operation. Fig. 19 |
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