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CS5165AGDWR16G Datasheet(PDF) 11 Page - ON Semiconductor |
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CS5165AGDWR16G Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 18 page CS5165A http://onsemi.com 11 Figure 17. Output Voltage Transient Response to a 14 A Load Turn−Off, VOUT = +2.84 V (DAC = 10111) Trace 1− GATE(H) (10 V/div.) Trace 2− Inductor Switching Node (5.0 V/div.) Trace 3− Load Current (5.0 A/div) Trace 4− VOUT (100 mV/div.) PROTECTION AND MONITORING FEATURES Short Circuit Protection A lossless hiccup mode short circuit protection feature is provided, requiring only the Soft−Start capacitor to implement. If a short circuit condition occurs the VFB low comparator sets the FAULT latch. This causes the top FET to shut off, disconnecting the regulator from it’s input voltage. The Soft−Start capacitor is then slowly discharged by a 2.0 mA current source until it reaches it’s lower 0.7 V threshold. The regulator will then attempt to restart normally, operating in it’s extended off time mode with a 50% duty cycle, while the Soft−Start capacitor is charged with a 60 mA charge current. If the short circuit condition persists, the regulator output will not achieve the 1.0 V low VFB comparator threshold before the Soft−Start capacitor is charged to it’s upper 2.5 V threshold. If this happens the cycle will repeat itself until the short is removed. The Soft−Start charge/discharge current ratio sets the duty cycle for the pulses (2.0 mA/60 mA = 3.3%), while actual duty cycle is half that due to the extended off time mode (1.65%). This protection feature results in less stress to the regulator components, input power supply, and PC board traces than occurs with constant current limit protection (see Figures 18 and 19). If the short circuit condition is removed, output voltage will rise above the 1.0 V level, preventing the FAULT latch from being set, allowing normal operation to resume. Figure 18. Demonstration Board Hiccup Mode Short Circuit Protection. Gate Pulses are Delivered While the Soft−Start Capacitor Charges, and Cease During Discharge M 25.0 ms Trace 3− Soft−Start Timing Capacitor (1.0 V/div.) Trace 4− 5.0 V Supply Voltage (2.0 V/div.) Trace 2− Inductor Switching Node (2.0 V/div.) Figure 19. Demonstration Board Startup with Regulator Output Shorted To Ground M 50.0 ms Trace 4− 5.0 V from PC Power Supply (2.0 V/div.) Trace 2− Inductor Switching Node (2.0 V/div.) Overvoltage Protection Overvoltage protection (OVP) is provided as result of the normal operation of the V2 control topology and requires no additional external components. The control loop responds to an overvoltage condition within 100 ns, causing the top MOSFET to shut off, disconnecting the regulator from it’s input voltage. The bottom MOSFET is then activated, resulting in a “crowbar” action to clamp the output voltage and prevent damage to the load (see Figures 20 and 21 ). The regulator will |
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