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LM21212-2 데이터시트(PDF) 11 Page - Texas Instruments |
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LM21212-2 데이터시트(HTML) 11 Page - Texas Instruments |
11 / 32 page SHORT-CIRCUIT Iclf Iclr VSS VFB VOUT VSW IL CURRENT LIMIT SHORT-CIRCUIT REMOVED 100 mV LM21212-2 www.ti.com SNVS715A – MARCH 2011 – REVISED MARCH 2013 Figure 23. Current Limit Conditions THERMAL PROTECTION Internal thermal shutdown circuitry is provided to protect the integrated circuit in the event that the maximum junction temperature is exceeded. When activated, typically at 165°C, the LM21212-2 tri-states the power FETs and resets soft start. After the junction cools to approximately 155°C, the device starts up using the normal start up routine. This feature is provided to prevent catastrophic failures from accidental device overheating. Note that thermal limit will not stop the die from operating above the specified operating maximum temperature,125°C. The die should be kept under 125°C to ensure correct operation. POWERGOOD FLAG The PGOOD pin provides the user with a way to monitor the status of the LM21212-2. In order to use the PGOOD pin, the application must provide a pull-up resistor to a desired DC voltage (i.e. Vin). PGOOD will respond to a fault condition by pulling the PGOOD pin low with the open-drain output. PGOOD will pull low on the following conditions – 1) VFB moves above or below the VOVP or VUVP, respectively 2) The enable pin is brought below the enable threshold 3) The device enters a pre-biased output condition (VFB>VSS). Figure 24 shows the conditions that will cause PGOOD to fall. Copyright © 2011–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM21212-2 |
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