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CS5165GDWR16 Datasheet(PDF) 10 Page - Cherry Semiconductor Corporation |
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CS5165GDWR16 Datasheet(HTML) 10 Page - Cherry Semiconductor Corporation |
10 / 19 page Figure 8: Output Voltage Transient Response to a 14A load step, VOUT = +2.84V(DAC = 10111). Figure 9: Output Voltage Transient Response to a 14A load turn-off, VOUT = +2.84V (DAC = 10111). Short Circuit Protection A lossless hiccup mode short circuit protection feature is provided, requiring only the Soft Start capacitor to imple- ment. If a short circuit condition occurs the VFB low com- parator sets the FAULT latch. This causes the top FET to shut off, disconnecting the regulator from its input voltage. The Soft Start capacitor is then slowly discharged by a 2µA current source until it reaches its lower 0.7V threshold. The regulator will then attempt to restart normally, operating in its extended off time mode with a 50% duty cycle, while the Soft Start capacitor is charged with a 60µA charge cur- rent. If the short circuit condition persists, the regulator output will not achieve the 1V low VFB comparator threshold before the Soft Start capacitor is charged to its upper 2.5V threshold. If this happens the cycle will repeat itself until the short is removed. The Soft Start charge/discharge cur- rent ratio sets the duty cycle for the pulses (2µA/60µA = 3.3%), while actual duty cycle is half that due to the extend- ed 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 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: Demonstration board hiccup mode short circuit protection. Gate pulses are delivered while the Soft Start capacitor charges, and cease during discharge. Figure 11: Demonstration board Start up with regulator output shorted to ground. 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.) Protection and Monitoring Features Trace 1 - GATE(H) (10V/div) Trace 2 - Inductor Switching Node (5V/div) Trace 3 -Load Current (5A/div) Trace 4 - VOUT(100mV/div) Trace 1 - GATE(H) (10V/div) Trace 2 - Inductor Switching Node (5V/div) Trace 3 -Load Current (5A/div) Trace 4 - VOUT (100mV/div) 10 Application Information: continued |
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