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UC2902DTR датащи(PDF) 6 Page - Texas Instruments |
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UC2902DTR датащи(HTML) 6 Page - Texas Instruments |
6 / 10 page UC2902 UC3902 SLUS232E − DECEMBER 19, 2002 − REVISED JULY 2011 6 www.ti.com APPLICATION INFORMATION The values of five passive components must be determined to configure the UC3902 load share controller. The output and return lines of each converter are connected together at the load, with current sense resistor RSENSE inserted in each negative return line. Another resistor, RADJ, is also inserted in each positive remote sense line. The differential share bus terminals (SHARE+ and SHARE−) of each UC3902 are connected together respectively, and the SHARE− node is also connected to the system ground. A typical application is illustrated in Figure 1. The load share controller design can be executed by following the next few steps: Step 1. RSENSE + VSHARE(max) ACSA IO(max) D where ACSA is 40, the gain of the current sense amplifier At full load, the voltage drop across the RSENSE resistor is IO(max) × RSENSE. Taking into account the gain of the current sense amplifier, the voltage at full load on the current share bus, VSHARE(max) + ACSA IO(max) RSENSE This voltage must stay 1.5-V below VCC or below 10 V whichever is smaller. VSHARE represents an upper limit but the designer should select the full scale share bus voltage keeping in mind that every volt on the load share bus increases the master controller’s supply current by approximately 100 μA times the number of slave units connected parallel. Step 2. RG + VADJ(max) IADJ(max) Care must be taken to ensure that IADJ(max) is low enough so that both the drive current and power dissipation are within the device’s capability. For most applications, an IADJ(max) current between 5 mA and 10 mA is acceptable. In a typical application, a 360-Ω RG resistor from the ADJR pin to ground sets IADJ(max) to approximately 5 mA. Step 3. RADJ + DVO(max) * IO(max) RSENSE IADJ(max) RADJ must be low enough to not affect the normal operation of the converter’s voltage feedback loop. Typical RADJ values are between 20 Ω to100 Ω depending on VO, ΔVO(max) and the selected IADJ(max) value. Step 4. CC + gM 2p fC RADJ RG RSENSE RLOAD ACSA APWR fC (1) (2) (3) (4) (5) |
Аналогичный номер детали - UC2902DTR |
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Аналогичное описание - UC2902DTR |
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