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LM34910 Arkusz danych(PDF) 3 Page - National Semiconductor (TI) |
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LM34910 Arkusz danych(HTML) 3 Page - National Semiconductor (TI) |
3 / 11 page Pin Description PIN NAME DESCRIPTION APPLICATION INFORMATION 1 SW Switching Node Internally connected to the buck switch source. Connect to the external inductor, diode, and boost capacitor. 2 BST Boost pin for boot-strap capacitor Connect a 0.022 µF capacitor from SW to this pin. An internal diode charges the capacitor during the off-time. 3I SEN Current sense input Internally the current sense resistor connects from this pin to S GND. Re-circulating current flows out of this pin to the free-wheeling diode. Current limit is set at 1.25A. 4S GND Sense Ground Re-circulating current flows into this pin to the current sense resistor. 5 RTN Circuit Ground Ground for all internal circuitry other than the current limit detection. 6 FB Feedback Internally connected to the regulation and over-voltage comparators. The regulation level is 2.5V. 7 SS Softstart An internal 11.5 µA current source charges an external capacitor to 2.5V to provide the softstart function. 8R ON/SD On-time Control and Shutdown An external resistor from V IN to this pin sets the buck switch on-time. Grounding this pin shuts down the regulator. 9V CC Output from the start-up regulator Nominally regulated to 7.0V. An external voltage (8V-14V) can be connected to this pin to reduce internal dissipation. An internal diode connects V CC to V IN. 10 V IN Input supply voltage Nominal input range is 8.0V to 36V. www.national.com 3 |
Podobny numer części - LM34910 |
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Podobny opis - LM34910 |
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