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NCP392CRFCCT1G Datasheet(PDF) 7 Page - ON Semiconductor |
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NCP392CRFCCT1G Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 10 page NCP392C www.onsemi.com 7 Figure 5. External Connection to GND of OVLO INPUT VREF SEL OVLO GND Fault & EN ACOK If OVLO pin is not grounded, and by adding external bridge resistor on OVLO pin, between IN and GND, overvoltage protection can be adjusted as following: Figure 6. External Connection to Resistor Bridge of OVLO INPUT VREF SEL OVLO GND Fault & EN ACOK NEW_OVLO TH + OVLO EXT R 1 ) R2 R 2 (eq. 1) With: OVLOEXT = 1.221 V Typical (OVLO External Reference) Example: NEW_OVLOTH target 12 V. R1 + R2 OVLO 1.221 * 1 + R2 12 1.221 * 1 + 8.828 R2 (eq. 2) Taking into account external input bridge doesn’t have excessive current consumption, and 1% is recommended: R2 arbitrarilly fixed at 1.05 M W. R1 = 9.269 M W (9.31 MW standard value) Obtained typical OVLO = 12.04 V C1 and C2 should be selected in such a way that the time constant R1C1 = R2C2. EN Input To enable normal operation, the EN pin has to be at low level. There is neither internal pull up, nor internal pull down connected to EN pin. If not externally driven, this pin and so NCP392C switch are undefined state. A high level on the pin, disconnects OUT pin from IN pin. Table 4. CONTROL LOGIC MODES OVP State NCP392Cx OVLO EXT Low High EN Low ON Tstart 15 ms OFF High OFF OFF |
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