The Max1917 Provides Pre Biased Soft Start for Redundant Power Supplies

Pre biased soft start has become an important function of redundant power system, parallel power module, battery backup voltage bus and other systems that require multiple power supplies to supply power to a single node. Especially during the soft start of DC / DC converter, the pre bias soft start can ensure that the output capacitor does not discharge. The discharge of the output capacitor may cause start-up oscillation during cold start or high voltage interference on the output voltage bus during hot plug. Preventing the discharge of output capacitor has become a conventional requirement in the design of load point power supply. Pre biased soft start has become an important function of redundant power system, parallel power module, battery backup voltage bus and other systems that require multiple power supplies to supply power to a single node. Especially during the soft start of DC / DC power converter, the pre bias soft start can ensure that the output capacitor does not discharge. The discharge of output capacitor may cause start oscillation during cold start or high voltage interference on the output voltage bus during hot plug. Preventing the discharge of output capacitor has become a conventional requirement in the design of load point power supply. The max1917 was originally designed for voltage tracking termination of dual data rate (DDR) memory. When the reference voltage acts on refin, in order to avoid large input surge current, max1917 increases the output inductance current to the preset output current threshold through five stages. By directly increasing the inductance current instead of feedback the reference voltage, the output inductance current always charges the output capacitor until the output voltage reaches the regulated value. Therefore, no negative inductive current will be generated during soft start, and no output capacitor discharge will occur. Although max1917 is designed for DDR memory termination power supply, its excellent transient response and small package size make it a better choice for load point power supply. Figure 1 shows the schematic diagram of max1917 for 2.5V load point power supply, table 1 gives the material list, and Figure 2 shows the soft start waveform of output voltage and output inductance current. As can be seen from these figures, there is no output voltage discharge during soft start, while the output inductor current remains a constant current source. Figure 1. Max1917 realizes 2.5V power output table 1. 2.5v/15a design material list

The Max1917 Provides Pre Biased Soft Start for Redundant Power Supplies 1

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