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MB3759 Datasheet(PDF) 16 Page - Fujitsu Component Limited. |
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MB3759 Datasheet(HTML) 16 Page - Fujitsu Component Limited. |
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16 / 27 page  MB3759 16 • Initial limit current IL1 As the diode is reverse biased VIO is the input offset voltage to the op-amp (-10 mV ≤ VIO ≤ +10 mV) and this causes the variation in IL. Accordingly, if for example the variation in IL is to be limited to ±10 %, using equation (1) and only considering the variation in the offset voltage gives the following: This indicates a setting of 100 mV or more is required. • Polarity change point IL2 As this is the point where the diode becomes forward biased, it can be calculated by substituting [R4/(R3+R4) VREF - VD] for VO in equation (where VD is the forward voltage of the diode). • Final limit current IL3 The limit current for VO = 0 when R2 >> R1 is the point where the voltages on either side of RS and on either side of R5 are biased. R3//R4 is the resistance formed by R3 and R4 in parallel (R3R4/(R3 + R4)). When R3//R4 << R5, equation (2) becomes: In addition to determining the limit current IL3 for VO = 0, R3, R4, R5, and diode D also operate as a starter when the power is turned on. • Starter circuit The figure below shows the case when the starter circuit formed by R3, R4, R5, and D is not present. The output current IO after the operation of the current limiting circuit is: When VO = 0 such as when the power is turned on, the output current IO = -VI O / RS and, if the offset voltage VIO is positive, the output current is limited to being negative and therefore the output voltage does not rise. Accordingly, if using a fallback system with a detection resistor inserted in the output, always include a starter circuit, expect in the cases described later. VO > R3 + R4 R4 VREF The condition for VO is: RS IL1 = R1 + R2 R1 VO –VIO ∴IL1 = R1 + R2 R1 RS VO RS VIO – Eq. (1) (where R2 >> R1) R1 + R2 R1 ( VO + VEE ) − ( R2 >> R1 ) IO = RS 1 RS VIO RS VIO IL2 = R1 + R2 R1 RS R4 / (R3 + R4) · VREF – VD – RS IL3 = R3R4 + R3R5 + R4R5 R4R5 VREF − R3R5 VD − R4R5 VD − V IO (2) RS VIO ∴IL3 = RS 1 ( R3 + R4 R4 VREF − VD ) − 1 + (R 3 // R 4) / R5 1 Eq. RS VIO IL3 C = RS 1 ( R3 + R4 R4 VREF – VD) – IO = R1 + R2 R1 RS VO RS VIO − |
Similar Part No. - MB3759 |
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Similar Description - MB3759 |
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