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UC2849DW データシート(PDF) 10 Page - Texas Instruments |
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UC2849DW データシート(HTML) 10 Page - Texas Instruments |
10 / 21 page www.ti.com Grounds, Voltage Sensing and Current Sensing 100pF 100pF 100pF 100pF CLKSYN CLKSYN CLKSYN CLKSYN 20 20 20 20 OSC1 OSC2 OSC3 OSC10 C L K S Y N B U S 10kW UC2849 UC3849 SLUS360C – JULY 1995 – REVISED AUGUST 2007 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 amplifier 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 current. 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 amplifier's common mode input voltage range to include VEE which is approximately –0.7 V below ground. The resistor RADJ is used for load sharing. The unit which is the master will force VADJ to 1.0 V. Therefore, the regulated voltage being sensed is actually: Figure 5. Oscillator Synchronization Connection Diagram Figure 6. Voltage and Current Sense VEE Tied to GND 10 Submit Documentation Feedback |
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