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UC2849DW Fiches technique(PDF) 11 Page - Texas Instruments

No de pièce UC2849DW
Description  SECONDARY SIDE AVERAGE CURRENT MODE CONTROLLER
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Site Internet  http://www.ti.com
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UC2849DW Fiches technique(HTML) 11 Page - Texas Instruments

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VSP * VSM + VREF * VADJ
R
ADJ
R1 ) RADJ
) VADJ
(4)
VSM + 0 V, VADJ + 1 V(master), VREF + 5 V
(5)
VSP + 4
R
ADJ
R1 ) RADJ
) 1 V
(6)
Phase
AVO
qm=50º
200
160
120
80
40
0
10
100
1k
10k
100k
1M
10M
100M
f-Frequency-Hz
Startup and Shutdown
UC2849
UC3849
SLUS360C – JULY 1995 – REVISED AUGUST 2007
The ADJ pin voltage on the slave chips will increase forcing their load currents to increase to match the master.
The ac frequency response of the voltage error amplifier is shown in Figure 7.
Figure 7. AC Frequency Response of the
Voltage Error Amplifier
Isolated power up can be accomplished using the UCC1889. Application Note U-149 is available for additional
information.
The UC3849 offers several features that enhance startup and shutdown. Soft start is accomplished by
connecting RUN to VA+ and a capacitor to ground. The resulting RC rise time on the VA+ pin initiates a soft
start. It can also be accomplished by connecting RUN to ILIM. When RUN is low it commands zero load current,
assuring a soft start. The undervoltage lockout (UVLO) is a logical AND of ENBL < 2.5 V, SEQ > 2.5 V, VCC >
8.4 V and VREF > 4.65 V. The block diagram shows that the thresholds are set by comparators. By placing an
RC divider on the SEQ pin, the enabling of multiple chips can be sequenced with different RC time constants.
Similarly, different RC time constants on the ENBL pins can sequence shutdown. The UVLO keeps the output
from switching; however the internal reference starts up with VCC less than 8.4 V. The KILL input shuts down
the switching of the chip. This can be used in conjunction with an overvoltage comparator for overvoltage
protection. In order to restart the chip after KILL has been initiated, the chip must be powered down and then
back up. A pulse on the ENBL pin also accomplishes this without actually removing voltage to the VCC pin.
11
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