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NCP81147MNTXG Datasheet(PDF) 8 Page - ON Semiconductor |
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NCP81147MNTXG Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 12 page NCP81147 www.onsemi.com 8 VSEN VTH LG BUFFER VPU Figure 4. PreOVP circuit Vin Detection During the soft start after the VSEN pin exceeds 80% Vref, UV protection will be enabled; If a UV fault is triggered in the softstart, it will restart SS after a fixed delay. The UV protection is to avoid IC to startup without Vin or with insufficient Vin voltage. Overcurrent Protection NCP81147 measures the differential current sensing signal through CSP and CSN/VO pin. There are two current protection levels: OCP1 and OCP2. If the differential voltage across pin CSP and CSN/VO is over 20 mV (but below 30 mV) for four consecutive cycles, OCP1 will be tripped. Both UG and LG will be forced to low to turn off the high side and low side FETs, it is a latched condition; If the differential voltage across pin CSP and CSN is over 30 mV, OCP2 will be tripped, the UG and LG will be pulled low and latched immediately. Toggling VCC power or EN will reset the Overcurrent protection. The current sensing R/C network should be selected to match the inductor time constant as below, (RCS1 RCS2) @ C + L DCR (Notes: the actual RC network time constant may be slightly higher) Thus, OCP1 and OCP2 levels can be configured as, OCP1 + 20 mV DCR @ RCS1 ) RCS2 RCS2 OCP2 + 30 mV DCR @ RCS1 ) RCS2 RCS2 |
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