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LMZ10505EXT bảng dữ liệu(PDF) 11 Page - Texas Instruments |
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LMZ10505EXT bảng dữ liệu(HTML) 11 Page - Texas Instruments |
11 / 36 page SS C nF / ms 2.5 = CSS = tSS x ISS VREF VIN EN GND VOUT Renb Rent VIN Cin1 Master Power Supply VOUT1 VOUT2 CO1 LMZ10505EXT VIN EN GND LMZ10505EXT Renb Rent VIN Cin1 LMZ10505EXT www.ti.com SNVS669H – JUNE 2010 – REVISED SEPTEMBER 2015 Feature Description (continued) Figure 16. Setting Enable and UVLO Alternatively, the EN pin can be driven from another voltage source to cater to system sequencing requirements commonly found in FPGA and other multi-rail applications. The following schematic shows an LMZ10505EXT that is sequenced to start based on the voltage level of a master system rail (VOUT1). Figure 17. Setting Enable and UVLO Using External Power Supply 7.3.3 Soft-Start The LMZ10505EXT begins to operate when both the VIN and EN, voltages exceed the rising UVLO and enable thresholds, respectively. A controlled soft-start eliminates inrush currents during start-up and allows the user more control and flexibility when sequencing the LMZ10505EXT with other power supplies. In the event of either VIN or EN decreasing below the falling UVLO or enable threshold respectively, the voltage on the soft-start pin is collapsed by discharging the soft-start capacitor by a 14-µA (typical) current sink to ground. 7.3.4 Soft-Start Capacitor Determine the soft-start capacitance with the following relationship: where • VFB is the internal reference voltage (nominally 0.8 V), • ISS is the soft-start charging current (nominally 2 µA) • and CSS is the external soft-start capacitance. (2) Thus, the required soft-start capacitor per unit output voltage startup time is given by (3) For example, a 4-ms soft-start time will yield a 10-nF capacitance. The minimum soft-start capacitance is 680 pF. Copyright © 2010–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LMZ10505EXT |
Số phần tương tự - LMZ10505EXT_15 |
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Mô tả tương tự - LMZ10505EXT_15 |
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