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DS_DNM04SMD10_07162008
12
FEATURE DESCRIPTIONS (CON.)
Sequential Start-up
Sequential start-up (Figure 40) is implemented by placing
an On/Off control circuit between Vo
PS1
and the On/Off pin
of PS2.
Simultaneous
Simultaneous tracking (Figure 41) is implemented by
using the TRACK pin. The objective is to minimize the
voltage difference between the power supply outputs
during power up and down.
The simultaneous tracking can be accomplished by
connecting Vo
PS1
to the TRACK pin of PS2. Please note
the voltage apply to TRACK pin needs to always higher
than the Vo
PS2
set point voltage.
R1
R2
Vo
PS1
PS1
Vin
On/Off
On/Off
PS2
Vo
PS2
Vin
C1
Q1
R3
TRACK
Vo
PS1
PS2
Vo
PS2
PS1
Vin
Vin
On/Off
On/Off