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LTM4628
APPLICATIONS INFORMATION
INTV CC
C10
4.7μF
R2
10k
PGOOD
5V TO 16V INTERMEDIATE BUS
MODE_PLLIN
CLKOUT INTV CC EXTV CC
PGOOD1
R1
10k
C3
22μF
25V
C2
22μF
25V
C1
22μF
25V
R6
120k
V IN
TEMP
RUN1
RUN2
V OUT1
V OUTS1
SW1
V FB1
C6
100μF
6.3V
1.5V AT 8A
C8
470μF
6.3V
R TB
60.4k
R FB
60.4k
D1 MASTER
5.1V ZENER
C SS
0.1μF
1.5V
RAMP TIME
t SOFTSTART = (C SS /1.3μA) ? 0.6V
R TA
60.4k
R4
100k
TRACK1
TRACK2
f SET
PHASMD
SGND
GND
LTM4628
DIFFP
DIFFN
V FB2
COMP1
COMP2
V OUTS2
V OUT2
SW2
PGOOD2
DIFFOUT
SLAVE
PGOOD C4
INTV CC
R9
10k
40.2k
100μF
6.3V
1.2V AT 8A
C7
470μF
6.3V
4628 F06
Figure 6. Example of Output Tracking Application Circuit
Output Voltage Tracking
Output voltage tracking can be programmed externally
using the TRACK pins. The output can be tracked up
and down with another regulator. The master regulator’s
output is divided down with an external resistor divider
that is the same as the slave regulator’s feedback divider
to implement coincident tracking. The LTM4628 uses an
accurate 60.4k resistor internally for the top feedback
resistor for each channel. Figure 6 shows an example of
coincident tracking. Equations:
MASTER OUTPUT
SLAVE OUTPUT
V OUT _ SLAVE = ? 1 +
60.4k ?
? ? V TRACK
?
?
R TA ?
TIME
4628 F07
Figure 7. Output Coincident Tracking Waveform
V TRACK is the track ramp applied to the slave’s track pin.
V TRACK has a control range of 0V to 0.6V, or the internal
reference voltage. When the master’s output is divided
down with the same resistor values used to set the slave’s
output, then the slave will coincident track with the master
until it reaches its final value. The master will continue to
its final value from the slave’s regulation point. Voltage
tracking is disabled when V TRACK is more than 0.6V. R TA
in Figure 6 will be equal to the R FB for coincident tracking.
Figure 7 shows the coincident tracking waveforms.
The TRACK pin of the master can be controlled by a capaci-
tor placed on the master regulator TRACK pin to ground.
A 1.3μA current source will charge the TRACK pin up to
the reference voltage and then proceed up to INTV CC . After
the 0.6V ramp, the TRACK pin will no longer be in con-
trol, and the internal voltage reference will control output
regulation from the feedback divider. Foldback current
limit is disabled during this sequence of turn-on during
tracking or soft-starting. The TRACK pins are pulled low
4628fe
16
For more information www.linear.com/LTM4628
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