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LM22673-Q1 Fiches technique(PDF) 11 Page - Texas Instruments |
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LM22673-Q1 Fiches technique(HTML) 11 Page - Texas Instruments |
11 / 29 page 0.0 0.2 0.4 0.6 0.8 1.0 1.2 5 10 15 20 25 30 35 40 45 SHORT CIRCUIT VOLTAGE (v) SAFE OPERATING AREA LM22673, LM22673-Q1 www.ti.com SNVS586O – SEPTEMBER 2008 – REVISED NOVEMBER 2014 Device Functional Modes (continued) Figure 11. SOA 7.4.2 Current-Limit Adjustment A key feature of the LM22673 is the ability to adjust the peak switch current limit. This can be useful when the full current capability of the regulator is not required for a given application. A smaller current limit may allow the use of power components with lower current ratings, thus saving space and reducing cost. A single resistor between the IADJ pin and ground controls the current limit in accordance with Figure 12. The current limit mode is set during start-up of the regulator. When VIN is applied, a weak pullup is connected to the IADJ pin and, after approximately 100 µs, the voltage on the pin is checked against a threshold of about 0.8V. With the IADJ pin open, the voltage floats above this threshold, and the current limit is set to the default value of 4.2A (typ). With a resistor present, an internal reference holds the pin voltage at 0.8 V; the resulting current sets the current limit. The accuracy of the adjusted current limit will be slightly worse than that of the default value, that is, +35% / –25% is to be expected. Resistor values should not exceed the limits shown in Figure 12. Figure 12. Current Limit vs IADJ Resistor 7.4.3 Thermal Protection Internal thermal shutdown circuitry protects the LM22673 should the maximum junction temperature be exceeded. This protection is activated at about 150°C, with the result that the regulator will shutdown until the temperature drops below about 135°C. Copyright © 2008–2014, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM22673 LM22673-Q1 |
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