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CS5150HGDR16 Datasheet(PDF) 9 Page - Cherry Semiconductor Corporation |
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CS5150HGDR16 Datasheet(HTML) 9 Page - Cherry Semiconductor Corporation |
9 / 14 page Applications Information: continued 9 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 10 and 11). If the short circuit condition is removed, output voltage will rise above the 1V level, preventing the FAULT latch from being set, allowing normal operation to resume. Figure 10: CS5150H demonstration board hiccup mode short circuit pro- tection. Gate pulses are delivered while the soft start capacitor charges, and cease during discharge. Figure 11: Startup with regulator output shorted. 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 100ns, causing the top MOSFET to shut off, disconnecting the regulator from its input voltage. The bottom MOSFET is then activat- ed, resulting in a “crowbar” action to clamp the output voltage and prevent damage to the load (see Figures 12 and 13). The regulator will remain in this state until the over- voltage condition ceases or the input voltage is pulled low. The bottom FET and board trace must be properly designed to implement the OVP function. Figure 12: OVP response to an input-to-output short circuit by immedi- ately providing 0% duty cycle, crow-barring the input voltage to ground. Figure 13: OVP response to an input-to-output short circuit by pulling the input voltage to ground. External Output Enable Circuit On/off control of the regulator can be implemented through the addition of two additional discrete compo- nents (see Figure 14). This circuit operates by pulling the soft start pin high, and the VFFB pin low, emulating a short circuit condition. Trace 4 = 5V from PC Power Supply (2V/div.) Trace 1 = Regulator Output Voltage (1V/div.) Trace 4 = 5V from PC Power Supply (5V/div.) Trace1 = Regulator Output Voltage (1V/div.) Trace 2 = Inductor Switching Node (5V/div.) Trace 4 = 5V from PC Power Supply (2V/div.) Trace 2 = Inductor Switching Node (2V/div.) Trace 4 - 5V Supply Voltage (2V/div.) Trace 3 - Soft Start Timing Capacitor (1V/div.) Trace 2 - Inductor Switching Node (2V/div.) |
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