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LM2715MTX-ADJ Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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LM2715MTX-ADJ Datasheet(HTML) 3 Page - National Semiconductor (TI) |
3 / 20 page Pin Functions Vcom+(Pin 1): Positive input terminal of Vcom amplifier. Vcom−(Pin 2): Negative input terminal of Vcom amplifier. Vcom(Pin 3): Output terminal of Vcom amplifier. AGND(Pin 4): Analog ground connection for LM2715. Con- nect all sensitive circuitry, ie. feedback resistors, delay ca- pacitor, and compensation network to its own dedicated AGND plane which connects directly to this pin. Delay(Pin 5): PMOS switch delay control pin. See Operation section for setting the delay time. The delay time begins when the output voltage of the DC/DC switching regulator reaches 85% of its true output voltage. This corresponds to a FB voltage of about 1.1V. The PMOS switch is controlled with both the delay time and the switch control pin, SWC. If no Cdelay capacitor is used, the PMOS switch is controlled solely with the SWC pin. V C(Pin 6): Compensation Network for Boost switching regu- lator. Connect resistor/capacitor network between V C pin and AGND for boost switching regulator AC compensation. FB(Pin 7): Feedback pin. Set the output voltage by selecting values of R1 and R2 using: Connect the ground of the feedback network to the AGND plane, which should be tied directly to the PGND pin. PGND(Pin 8):Connect all power ground components to a PGND plane which should also connect directly to this pin. Use a trace or via to connect the AGND plane to the PGND plane. Please see Layout Considerations under the Opera- tion section for more details on layout suggestions. SW(Pin 9): This is the drain of the internal NMOS power switch. Minimize the metal trace area connected to this pin to minimize EMI. V IN(Pin 10): Input Supply Pin. Bypass this pin with a capaci- tor as close to the device as possible. The capacitor should connect between V IN and PGND. SWI(Pin 11): PMOS switch input. Source connection of PMOS device. SWO(Pin 12): PMOS switch output. Drain connection of PMOS device. SWC(Pin13): PMOS switch control pin. This pin creates an AND function with the delay time after the output of the switching regulator has reached 85% of its nominal value. To ensure the PMOS switch is in the correct state, apply a voltage above 1.5V to this pin to turn on the PMOS switch and apply a voltage below 0.7V to turn off the PMOS switch. AV IN(Pin 14): Supply pin for the Vcom opamp and the Gamma buffer. Bypass this pin with a capacitor as close to the device as possible, about 100nF, if connected directly to the output of the boost DC/DC switching regulator. The capacitor should connect between AV IN and PGND. GMA(Pin 15): Gamma Buffer output pin. GMA+(Pin 16): Gamma Buffer input pin. Ordering Information Order Number Package Type NSC Package Drawing Supplied As LM2715MT-ADJ TSSOP-16 MTC16 73 Units, Rail LM2715MTX-ADJ TSSOP-16 MTC16 2500 Units, Tape and Reel www.national.com 3 |
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