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TPS53851 Datasheet(PDF) 19 Page - Texas Instruments |
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TPS53851 Datasheet(HTML) 19 Page - Texas Instruments |
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19 / 64 page  + VOUT GSNS DIFFO 30 kW 30 kW 30 kW 30 kW − COMP + 0.7 V VOUT RBIAS VFB R1 TPS53851 www.ti.com SLUS985 – DECEMBER 2009 5.6 TRACK FUNCTION IN CONFIGURING A SLAVE CHANNEL The TRACKx pin is internally clamped to 2.4 V. To configure a channel as a slave, the TRACKx pin is pulled up externally to 5 V. This configures the output of the error amplifier, COMPx, for that channel to be a high impedance, allowing the master COMP signal to control the slave channel. 5.7 DIFFERENTIAL AMPLIFER, U9 The unity gain differential amplifier has high bandwidth to achieve improved regulation at user defined point of load and ease layout constrains. The output voltage is sensed between the VOUT and GSNS pins. The output voltage programming divider is connected to the output of the amplifier, the DIFFO pin. Figure 5-4. Differential Amplifier Configuration DESIGN HINT: Because of the resistor configuration of the differential amplifier, the input impedance must be kept very low or errors result in setting the output voltage. 5.8 POWER GOOD The PGOOD1, PGOOD2 pins indicate when the inputs and output are within their specified ranges of operation. Also monitored are the UVLO_CE1, UVLO_CE2 and TRK1 and TRK2 pins. The PGOOD has a high impedance when indicating inputs and outputs are within specified limits and is pulled low to indicate an out of limits condition. The PGOOD signal is held low until the respective TRK1 or TRK2 pin voltages exceed 1.4 V, then the undervoltage, overcurrent or overtemperature controls the state of PGOOD. 5.9 SETTING THE OUTPUT VOLTAGE Two resistors, R1 and RBIAS sets the output voltage as shown in Figure 5-5. Figure 5-5. Setting the Output Voltage with RBIAS RBIAS is calculated in Equation 4. Copyright © 2009, Texas Instruments Incorporated APPLICATION INFORMATION 19 Submit Documentation Feedback Product Folder Link(s): TPS53851 |
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