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LM34917A Arkusz danych(PDF) 2 Page - Texas Instruments |
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LM34917A Arkusz danych(HTML) 2 Page - Texas Instruments |
2 / 22 page D3 D2 D1 C3 C2 C1 B3 B2 B1 A3 A2 A1 SW VIN RON RTN BST VCC SS FB SW VIN ISEN SGND D1 D2 D3 C1 C2 C3 B1 B2 B3 A1 A2 A3 LM34917A SNOSAX7D – DECEMBER 2007 – REVISED MARCH 2013 www.ti.com Connection Diagram Figure 1. Bump Side Figure 2. Top View Package Number YZR0012UNA Package Number YZR0012UNA PIN DESCRIPTIONS Pin Number Name Description Application Information A1 SGND Sense Ground Re-circulating current flows into this pin to the current sense resistor. A2 RTN Circuit Ground Ground for all internal circuitry other than the current limit detection. A3 FB Feedback input from the regulated Internally connected to the regulation and over-voltage output comparators. The regulation level is 2.5V. B1 ISEN Current sense The re-circulating current flows out of this pin to the free- wheeling diode. B2 RON/SD On-time control and shutdown An external resistor from VIN to this pin sets the buck switch on-time. Grounding this pin shuts down the regulator. B3 SS Softstart An internal current source charges an external capacitor to 2.5V, providing the softstart function. C1,C2 VIN Input supply voltage Operating input range is 8.0V to 33V, with over-voltage shutdown internally set at ≊35V. Transient capability is 50V. C3 VCC Output from the startup regulator Nominally regulated at 7.0V. Connect a 0.1 µF capacitor from this pin to RTN. An external voltage (8V to 14V) can be applied to this pin to reduce internal dissipation. An internal diode connects VCC to VIN. D1,D2 SW Switching Node Internally connected to the buck switch source. Connect to the inductor, diode, and bootstrap capacitor. D3 BST Boost pin for bootstrap capacitor Connect a 0.022 µF capacitor from SW to this pin. The capacitor is charged each off-time via an internal diode. These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. 2 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Product Folder Links: LM34917A |
Podobny numer części - LM34917A_15 |
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Podobny opis - LM34917A_15 |
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