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UC2849DW Fiches technique(PDF) 10 Page - Texas Instruments

No de pièce UC2849DW
Description  SECONDARY SIDE AVERAGE CURRENT MODE CONTROLLER
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
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UC2849DW Fiches technique(HTML) 10 Page - Texas Instruments

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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
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