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LM2677SD-ADJ Datasheet(PDF) 11 Page - Texas Instruments |
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LM2677SD-ADJ Datasheet(HTML) 11 Page - Texas Instruments |
11 / 34 page LM2677 www.ti.com SNVS077I – MAY 2004 – REVISED JUNE 2012 FEEDBACK This is the input to a two-stage high gain amplifier, which drives the PWM controller. It is necessary to connect pin 6 to the actual output of the power supply to set the dc output voltage. For the fixed output devices (3.3V, 5V and 12V outputs), a direct wire connection to the output is all that is required as internal gain setting resistors are provided inside the LM2677. For the adjustable output version two external resistors are required to set the dc output voltage. For stable operation of the power supply it is important to prevent coupling of any inductor flux to the feedback input. ON/OFF This input provides an electrical ON/OFF control of the power supply. Connecting this pin to ground or to any voltage less than 0.8V will completely turn OFF the regulator. The current drain from the input supply when OFF is only 50 μA. Pin 7 has an internal pull-up current source of approximately 20μA and a protection clamp zener diode of 7V to ground. When electrically driving the ON/OFF pin the high voltage level for the ON condition should not exceed the 6V absolute maximum limit. When ON/OFF control is not required pin 7 should be left open circuited. DAP (VSON PACKAGE) The Die Attach Pad (DAP) can and should be connected to PCB Ground plane/island. For CAD and assembly guidelines refer to Application Note AN-1187 (SNOA401). DESIGN CONSIDERATIONS Figure 19. Basic circuit for fixed output voltage applications. Figure 20. Basic circuit for adjustable output voltage applications Copyright © 2004–2012, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM2677 |
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