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UC2849 Fiches technique(PDF) 7 Page - Texas Instruments |
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UC2849 Fiches technique(HTML) 7 Page - Texas Instruments |
7 / 11 page 7 current discharge and subsequent charge cycles whether or not other units on the CLKSYN bus are still synchro- nizing. This requires the frequency of all free running oscillators to be within 40% of each other to guarantee synchronization. Grounds, Voltage Sensing and Current Sensing: The voltage is sensed directly at the load. Proper load sharing requires the same sensed voltage for each power supply connected in parallel. Referring to Figure 6, the positive sense voltage (VSP) connects to the voltage error ampli- fier inverting terminal (VA-), the return lead for the on- chip reference is used as the negative sense (VSM). The current is sensed across the shunt resistor, RS. Figure 6 shows one recommended voltage and current sensing scheme when VEE is connected to GND. The signal ground is the negative sense point for the output voltage and the positive sense point for the output cur- rent. The voltage offset on the current sense amplifier is not needed if VEE is separated from GND. VEE is the negative supply for the current sense amplifier. When it is separated from GND, it extends the current sense ampli- fier’s common mode input voltage range to include VEE which is approximately −0.7V below ground. The resistor RADJ is used for load sharing. The unit which is the mas- ter will force VADJ to 1.0V. Therefore, the regulated volt- age being sensed is actually RADJ R1 + RADJ VSM = 0V, VADJ = 1V (master), VREF = 5V RADJ R1 + RADJ Ω Figure 3. Output Frequency Figure 4. Maximum Duty Cycle Figure 5. Oscillator Synchronization Connection Diagram UDG-94113 Figure 6. Voltage and Current Sense VEE Tied to GND UDG-94114 VSP − VSM = (VREF − VADJ) · () + VADJ VSP = 4 · () + 1V UC1849 UC2849 UC3849 CIRCUIT BLOCK DESCRIPTION (cont.) |
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Description similaire - UC2849 |
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