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CS5151HGD16 数据表(PDF) 10 Page - ON Semiconductor |
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CS5151HGD16 数据表(HTML) 10 Page - ON Semiconductor |
10 / 16 page CS5151H http://onsemi.com 10 Figure 11. CS5151H Demonstration Board Response to 13 A Load Turn Off (Output Set for 2.8 V). V2 Control Topology Immediately Connects Inductor to Ground, Providing 0% Duty Cycle. Regulation is Achieved in Less Than 10 ms Trace 3− Output Current (13 to 0,5 Amps) (20 mV/div.) Trace 2− Inductor Switching Node (5.0 V/div.) Trace 1− Regulator Output Voltage (1.0 V/div.) PROTECTION AND MONITORING FEATURES VCC1 Monitor To maintain predictable startup and shutdown characteristics an internal VCC1 monitor circuit is used to prevent the part from operating below 3.75 V minimum startup. The VCC1 monitor comparator provides hysteresis and guarantees a 3.70 V minimum shutdown threshold. 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 (VFFB < 1.0 V), the VFFB low comparator sets the FAULT latch. This causes the MOSFET to shut off, disconnecting the regulator from it’s input voltage. The Soft Start capacitor is then slowly discharged by a 2.0 μA 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 μA charge current. If the short circuit condition persists, the regulator output will not achieve the 1.0 V low VFFB 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 μA/60 μA = 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 12 and 13). 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 12. CS5151H 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 13. Startup with Regulator Output Shorted M 50.0 μs 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 MOSFET to shut off, disconnecting the regulator from it’s input voltage. External Output Enable Circuit On/off control of the regulator can be implemented through two additional discrete components (see Figure 14). |
类似零件编号 - CS5151HGD16 |
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类似说明 - CS5151HGD16 |
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