Datenblatt-Suchmaschine für elektronische Bauteile |
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CS51221EN16 Datenblatt(PDF) 11 Page - Cherry Semiconductor Corporation |
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CS51221EN16 Datenblatt(HTML) 11 Page - Cherry Semiconductor Corporation |
11 / 12 page Application Information: continued Figure 10. The design of feedback voltage divider has to consider the error amplifier input current. Design voltage dividers for OV and UV detection In Fig.11, the voltage divider uses three resistors in series to set OV and UV threshold seen from the input voltage. The values of the resistors can be calculated from the fol- lowing three equations, where the third equation is derived from OV hysteresis requirement. VIN(LOW) × = 1V (A) VIN(HIGH) × = 2V (B) 12.5µA × (R1 + R2) = VHYST (C) where VLINE(LOW), VLINE(HIGH) = input voltage OV and UV threshold VHYST = OV hysteresis seen at VIN It is self-evident from equation A and B that to use this design, VIN(HIGH) has to be two times greater than VIN(LOW). Otherwise, two voltage dividers have to be used to program OV and UV separately. Figure 11. OV/UV Monitor Divider. VIN VUV VOV R3 R2 R1 ) R3 R2 + R3 + R1 ( ) R2 + R3 R2 + R3 + R1 ( COMP Ier 1.27 FB R2 R1 VOUT Ri 11 |
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