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PT8104 Datasheet(PDF) 10 Page - Texas Instruments |
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PT8104 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 14 page Application Notes For technical support and more information, see inside back cover or visit www.ti.com 10 Pin-Coded Output Voltage Programming of the 40-A Rated PT8100 Series Regulators The PT8100 series of Excalibur® ISRs incorporate a pin-coded programmable output voltage. In each case the desired output voltage must be selected from a preset range defined by the regulator model. Programming is achieved by selectively connecting the control inputs, “VID0–VID4” (“VID 25mV–VID3” for PT8104), pins 1–5, to the “VID Common,” pin 11. 1 The programming code and pinout information for each model is provided in the PT8100 specifications. Some of the program codes are compatible with the “Voltage ID” codes defined by the Intel® VRM specifications. Figure 1 shows the pin-strap connections for selecting 1.5V output voltage from a PT8101. Notes: 1. The programming convention is as follows:- Logic 0: Connect to pin 11 (VID Common). Logic 1: Open circuit/open drain (See notes 2, & 4) 2. The output voltage range of the PT8101 is limited to 2.7V maximum. Above this voltage, the performance of the module is not guaranteed. Although the module will appear to function above this voltage, VID 4 (pin 5) should not be used to set the output voltage higher than 2.7V. 3. Do not connect pull-up resistors to the voltage programming pins. 4. To minimize output voltage error, use pin 11 (VID Common) as the logic “0” reference. However if the regulator is used to power a VRM compatible Figure 1 microprocessor this may not be possible. In this case either connect pin 11 to pins 17–22, or the ground plane close to the regulator. This will allow the microprocessor to use the common ground as a VID control reference. 4. If active devices are used to ground the voltage control pins, low-level open-drain MOSFETs should be used over bipolar transistors. The inherent Vce(sat) in bipolar devices introduces errors in the device’s internal voltage control circuit. Discrete transistors such as the BSS138, 2N7002, IRLML2402, are examples of appropriate devices. Active Voltage Programming: Special precautions should be taken when making changes to the voltage control progam code while the output is active. It is recommended that the ISR be powered down or placed in standby. Changes made to the program code while Vout is active can induce high current transients through the device. This is the result of the electrolytic output capacitors being either charged or discharged to the new output voltage set-point. The transient current can be minimized by making only incremental changes to the binary code, i.e. one LSB at a time. A minimum of 100µs settling time between each program state is also recom- mended. Making non-incremental changes to VID3 and VID4 with the output enabled is discouraged. The tran- sients induced may activate the module’s over-current protection. When using active devices to program the output voltage, their state should be asserted prior to input power being applied. If this is not possible, pull STBY* (pin 6) to GND during the application of power, assert the program code, then release pin 6. The release of pin 6 will then to allow the device to initiate a soft- start power-up to the program voltage. PT8100 Series L O A D C OUT + C IN + V IN V O =1.5V GND V O SENSE L in 1µH GND VID0 VID1 VID2 VID3 VID4 PT8101 4321 31 23–30 617–22 12–16 5 11 VID4 – VID0 Sense V IN V OUT STBY GND VID Common Q1 BSS138 1 =OFF |
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