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BD3512MUV Datenblatt(PDF) 7 Page - Rohm |
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BD3512MUV Datenblatt(HTML) 7 Page - Rohm |
7 / 17 page 7/16 ●Operation of Each Block ・AMP This is an error amp compares the reference voltage (0.65V) with VO to drive the output Nch FET (Ron=50mΩ). Frequency optimization helps to realize rapid transient response, and to support the use of ceramic capacitors on the output. AMP input voltage ranges from GND to 2.7V, while the AMP output ranges from GND to VCC. When EN is OFF, or when UVLO is active, output goes LOW and the output of the NchFET switches OFF. ・EN The EN block controls the regulator’s ON/OFF state via the EN logic input pin. In the OFF position, circuit voltage is maintained at 0μA, thus minimizing current consumption at standby. The FET is switched ON to enable discharge of the NRCS pin VO, thereby draining the excess charge and preventing the IC on the load side from malfunctioning. Since no electrical connection is required (e.g. between the VCC pin and the ESD prevention diode), module operation is independent of the input sequence. ・UVLO To prevent malfunctions that can occur during a momentary decrease in VCC, the UVLO circuit switches the output OFF, and (like the EN block) discharges NRCS and VO. Once the UVLO threshold voltage (TYP3.80V) is reached, the power-on reset is triggered and output continues. ・CURRENT LIMIT When output is ON, the current limit function monitors the internal IC output current against the parameter value. When current exceeds this level, the current limit module lowers the output current to protect the load IC. When the overcurrent state is eliminated, output voltage is restored to the parameter value. ・NRCS (Non Rush Current on Start-up) The soft start function enabled by connecting an external capacitor between the NRCS pin and ground. Output ramp-up can be set for any period up to the time the NRCS pin reaches VFB (0.65V). During startup, the NRCS pin serves as a 20μ A (TYP) constant current source to charge the external capacitor. Capacitors with low susceptibility (0.001μF~1μF) to temperature are recommended, in order to assure a stable soft-start time. ・TSD (Thermal Shut down) The shutdown (TSD) circuit automatically is latched OFF when the chip temperature exceeds the threshold temperature after the programmed time period elapses, thus serving to protect the IC against “thermal runaway” and heat damage. Because the TSD circuit is intended to shut down the IC only in the presence of extreme heat, it is crucial that the Tj (max) parameter not be exceeded in the thermal design, in order to avoid potential problems with the TSD. ・VIN The VIN line acts as the major current supply line, and is connected to the output NchFET drain. Since no electrical connection (such as between the VCC pin and the ESD protection diode) is necessary, VIN operates independent of the input sequence. However, since an output NchFET body diode exists between VIN and VO, a VIN-VO electric (diode) connection is present. Note, therefore, that when output is switched ON or OFF, reverse current may flow to VIN from VO. ・PGOOD It outputs the status of the output voltage. This is open drain pin and connects to VCC pin through the pull-up resistance (100kΩ or so). When the output voltage range is VO×0.9 to VO×1.1(TYP), the status is high. |
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Ähnliche Beschreibung - BD3512MUV |
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