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PTB48560A, PTB48560B
PTB48560C
SLTS236A – MARCH 2005 – REVISED OCTOBER 2005
V O Bus
To
Internal
Smart Sense
+Sense
Error Amplifier
V O Seq
R (TRK)
24.9 k W
Track
Supply
Supervisor
20-mS
Delay
C (TRK)
1 m F
V O Com
Note: The shaded functions are only available with the PTB48560B (3.3-V output).
Figure 18. Block Diagram of Auto-Track Features
Notes:
1. Auto-Track compatible modules incorporate a Track input that can take direct control of the output voltage
during power-up transistions. The control relationship is on a volt-for-volt basis and is active between the 0 V
and the module set-point voltage. Once the Track input is above the set-point voltage, the module remains at
its set-point. Connecting the Track input of a number of such modules together allows their outputs to follow
a common control voltage during power up.
2. When +Sense is connected to the V O Seq output of the PTB48560B, the V O Seq output is tightly regulated to
the set-point voltage. In this configuration, the voltage at the V O Bus output is up to 100 mV higher.
3. The V O Seq output on the PTB48560B cannot sink load current. This constraint does not allow the module to
coordinate a sequenced power down.
4. The slew rate for the Track input signal must be between 0.1 V/ms and 1 V/ms. Above this range, the V O Seq
output may no longer accurately follow the Track input voltage. A slew rate below this range may thermally
stress the converter. These slew rate limits are automatically met whenever the Track voltage is controlled by
the internal R-C time constant of the modules being sequenced.
5. If an external voltage is used to control the Track terminal, the source current must be limited. A resistance
value of 2.74-k ? is recommended for this purpose. This is necessary to protect the internal transistor to the
converter. This transistor holds the track control voltage at ground potential for 20 ms after the V O Bus output
is in regulation.
17
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