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NCP1595AMNTWG Datasheet(PDF) 10 Page - ON Semiconductor |
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NCP1595AMNTWG Datasheet(HTML) 10 Page - ON Semiconductor |
10 / 13 page NCP1595, NCP1595A, NCP1595C http://onsemi.com 10 PROTECTIONS Undervoltage Lockout (UVLO) The under voltage lockout feature prevents the controller from switching when the input voltage is too low to power the internal power supplies and reference. Hysteresis must be incorporated in the UVLO comparator to prevent IxR drops in the wiring or PCB traces from causing ON/OFF cycling of the controller during heavy loading at power up or power down. Overcurrent Protection (OCP) NCP1595/A/C detects high side switch current and then compares to a voltage level representing the overcurrent threshold limit. If the current through the high side FET exceeds the overcurrent threshold limit for seven consecutive switching cycles, overcurrent protection is triggered. Once the overcurrent protection occurs, hiccup mode engages. First, hiccup mode, turns off both FETs and discharges the internal compensation network at the output of the OTA. Next, the IC waits typically 2 ms and then resets the overcurrent counter. After this reset, the circuit attempts another normal soft−start. During soft−start, the overcurrent protection threshold is increased to prevent false overcurrent detection while charging the output capacitors. Hiccup mode reduces input supply current and power dissipation during a short circuit. It also allows for much improved system up−time, allowing auto−restart upon removal of a temporary short−circuit. Power Save Mode If the load current decreases, the converter can skip switching and operate with reduced frequency. This minimizes the quiescent current and maintains high efficiency. NCP1595C disables this feature. Pre−Bias Startup In some applications the controller will be required to start switching when it’s output capacitors are charged anywhere from slightly above 0 V to just below the regulation voltage. This situation occurs for a number of reasons: the converter’s output capacitors may have residual charge on them or the converter’s output may be held up by a low current standby power supply. NCP1595/A/C supports pre−bias start up by holding switching off until the soft−start ramp reaches the FB Pin voltage. Thermal Shutdown The NCP1595/A/C protects itself from over heating with an internal thermal monitoring circuit. If the junction temperature exceeds the thermal shutdown threshold both the upper and lower MOSFETs will be shut OFF. |
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