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PTB78520WAD Datasheet(PDF) 10 Page - Texas Instruments |
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PTB78520WAD Datasheet(HTML) 10 Page - Texas Instruments |
10 / 15 page Application Notes For technical support and further information visit http://power.ti.com PTH03050W 15 6 3 4 2 Track VIN VO GND Inhibit Adjust PTH03050W 15 6 3 4 2 Track VIN VO GND Inhibit Adjust R1 887 C3 100 µF C4 100 µF R2 2.21 k R3 5.49 k C1 100 µF Vo Seq (3.3 V) VPOL1 (2.5 V) VPOL2 (1.8 V) +VI –VI C2 100 µF PTB78520W VO Bus VO Seq +VI –VI +Sense VO Adjust –Sense VO COM VO Enable Track 1 2 3 4 8 10 9 7 6 5 U1 U2 U3 Figure 2-2; Power-Up Sequencing Circuit With PTB78520W & Non-Isolated POL Modules V Bus (1 V/Div) o V Seq (1 V/Div) o V 1 (1 V/Div) POL V 2 (1 V/Div) POL HORIZ SCALE: 20 ms/Div t =20 ms d Figure 2-3; PTB78520 Power-Up Waveforms with POL Modules Typical Power-Up Sequencing Configuration Figure 2-2 shows how the PTB78520W (U1) can be configured to provide two 3.3 V sources, that allow it to both power and sequence with one or more non-isolated POL modules. The example shows two PTH03050W modules (U2 & U3), each rated for up 6 A of output current. Additional voltages, as well as modules with a higher output current capability can also be specified to meet a specific application. The number of downstream modules, their respective output voltage and load current rating is only limited by the amount of current available at the ‘VO Bus’ output. This is 20 A, less the current allocated to the load circuit via the ‘VO Seq’ output. The output voltage adjust range of the PTB78520W is 1.8 V to 3.6 V, which is compatible with the 3.3-V input non-isolated POL modules. In these applications, the PTB78520W output voltage must always be set to 3.3 V (R1 =887Ω). Note that this sets the output voltage of both the ‘VO Bus’ and ‘VO Seq’ outputs. The 3.3-V input non-isolated modules, U2 and U3, can be set to any volt- age over the range, 0.8 V to 2.5 V. In this example they are set to 2.5 V (R2 =2.21 kΩ) and 1.8 V (R3 =5.49 kΩ) respectively. Figure 2-3 shows the power-up waveforms from Figure 2-2 when the Track control input to all three modules are simply connected together. The PTB78520W provides input power to the down- stream non-isolated modules via the ‘Vo Bus’ output. This is the output that rises first to allow the down- PTB78520W stream modules to complete their power-up initialization. ‘VO Seq’ (3.3 V), and the outputs VPOL1 (2.5 V) and VPOL2 (1.8 V), supply the load circuit. These three outputs are controlled by the track control voltage, which the PTB78520W holds at ground potential for 20 ms after the ‘VO Bus’ output is in regulation. When the track control voltage is finally allowed to rise, the three outputs rise simultaneously to their respective set-point voltages. Not Recommended for New Designs |
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