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TPS40131RHBRG4 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS40131RHBRG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 46 page www.ti.com Startup Sequence UDG−04031 EN/SYNC BP5 VIN5 0.7V 1.0V VOUT PGOOD SSWAIT SS EN_SSWAIT Differential Amplifier (U7) 4 3 GSNS DIFFO VOUT + Differential Amplifier TPS40131 5 20 k Ω 20 k Ω 20 k Ω 20 k Ω UDG−04081 TPS40131 SLVS635 – FEBRUARY 2007 FUNCTIONAL DESCRIPTION (continued) Figure 1 shows a typical start up with the VIN5 and BP5 applied to the controller and then the EN/SYNC being enabled. Shut down occurs when the VIN5 is removed Figure 1. Startup and Shutdown Sequence The unity gain differential amplifier with high bandwidth allows improved regulation at a user-defined point and eases layout constraints. The output voltage is sensed between the VOUT and GSNS pins. The output voltage programming divider is connected to the output of the amplifier (DIFFO). If there is no need for a differential amplifer, the differential amplifier can be disabled by connecting the GSNS pin to the BP5 pin and leaving VOUT and DIFFO open. The voltage programming divider in this case should be connected directly to the output of the converter. Figure 2. Differential Amplifier Configuration Because of the resistor configuration of the differential amplifier, the input impedance must be kept very low or there will be error in setting the output voltage. 10 Submit Documentation Feedback |
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