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NCP1654BD133R2G Arkusz danych(PDF) 20 Page - ON Semiconductor |
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NCP1654BD133R2G Arkusz danych(HTML) 20 Page - ON Semiconductor |
20 / 23 page NCP1654 http://onsemi.com 20 Figure 45. Brown−Out Protection + - BO 4 RboL RboU CBO Vbo Vin + Vac + − IN VboH / VboL VboH = 1.3 V, VboL = 0.7 V After Device Operates Before Device Operates Hence a larger hysteresis of the brown out comparator is needed, which is 0.7 V typical in this device. When Vbo goes below than VBOL (0.7 V typical), the device turns off the Drive output and keeps it off till Vbo exceeds VBOH (1.3 V typical). When the device awakes after an off−state (Undervoltage lockout or shutdown), the default threshold is VBOH. Overpower Limitation (OPL) This is a second OCP with a threshold that is line dependent. Sense current Ics represents the inductor current IL and hence represents the input current approximately. Input voltage signal Vbo represents the rms input voltage. The product (Ics ⋅ Vbo) represents an approximated input power (IL ⋅ Vac). It is illustrated in Figure 46. Figure 46. Over−Power Limitation Current Mirror >200 mVA? OPL + RCS ICS CS Vbo 4 3 RSENSE Vin IL ICS + IL RSENSE RCS When the product (Ics ⋅ Vbo) is greater than a permissible level 200 mVA, the device turns off the drive output so that the input power is limited. The OPL is automatically deactivated when the product (Ics ⋅ Vbo) is lower than the 200 mVA level. This 200 mVA level corresponds to the approximated input power (IL ⋅ Vac) to be smaller than the particular expression in (Equation 23). (eq. 23) IcsVbo t 200 mVA IL RSENSE RCS @ 22 KBO p @ Vac t 200 mVA IL @ Vac t RCS @ p RSENSE @ KBO @ 50 2 mVA Bias the Controller It is recommended to add a typical 1 nF to 100 nF decoupling capacitor next to the Vcc pin for proper operation. When the NCP1654 operates in follower boost mode, the PFC output voltage is not always regulated at a particular level under all application range of input voltage and load power. It is not recommended to make a low−voltage bias supply voltage by adding an auxiliary winding on the PFC boost inductor. Alternatively, it is recommended to get the Vcc biasing supply from the 2nd−stage power conversion stage. |
Podobny numer części - NCP1654BD133R2G |
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Podobny opis - NCP1654BD133R2G |
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