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LM2794 데이터시트(PDF) 2 Page - Texas Instruments |
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LM2794 데이터시트(HTML) 2 Page - Texas Instruments |
2 / 24 page A1 B2 C1 D2 E1 E3 E5 E7 D6 C7 B6 A7 A5 A3 LM2794, LM2795 SNVS168L – JANUARY 2002 – REVISED MAY 2013 www.ti.com DESCRIPTION (CONTINUED) Brightness can be controlled by both linear and PWM techniques. A voltage between 0V and 3.0V may be applied to the BRGT pin to linearly vary the LED current. Alternatively, a PWM signal can be applied to the SD pin to vary the perceived brightness of the LED. The SD pin reduces the operating current to 2.3µA (typ.) The LM2794 is shut down when the SD pin is low, and the LM2795 is shut down when the SD pin is high. The LM2794/95 is available in a DSBGA CSP package. Connection Diagram Figure 1. DSBGA Package Bottom View PIN DESCRIPTION Pin(1) Name Function A1 C1+ Positive terminal of C1 B2 C1 − Negative terminal of C1 C1 VIN Power supply voltage input D2 GND Power supply ground input E1 C2 − Negative terminal of C2 E3,E5,E7,D6 D1 −4 Current source outputs. Connect directly to LED C7 ISET Current Sense Input. Connect 1% resistor to ground to set constant current through LED B6 BRGT Variable voltage input controls output current A7 SD The LM2794 has an active-low shutdown pin (LOW = shutdown, HIGH = operating). The LM2795 has an active-high shutdown pin (HIGH = shutdown, LOW = operating) that has a pull-up to VIN. A5 C2+ Positive terminal of C2 A3 POUT Charge pump output (1) Note that the pin numbering scheme for the DSBGA package was revised in April, 2002 to conform to JEDEC standard. Only the pin numbers were revised. No changes to the physical location of the inputs/outputs were made. For reference purpose, the obsolete numbering had C1+ as pin 1, C1- as pin 2, VIN as pin 3, GND as pin 4, C2- as pin 5, D1-D4 as pin 6,7,8 & 9, Iset as pin 10, BRGT as pin 11, SD as pin 12, C2+ as pin 13, Pout as pin 14 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 © 2002–2013, Texas Instruments Incorporated Product Folder Links: LM2794 LM2795 |
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