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For type C (DNXXX0A0XXXX C), the simultaneous tracking can be accomplished by putting R1 equal
to 30.1K Ω through Vo
PS1
to the TRACK pin of PS2. Figure 12 shows the circuit diagram of
Simultaneous start-up when Vo
PS2
tracks the Vo
PS1
(only for type C).
R1
R2
TRACK
Vo
PS1
PS2
Vo
PS2
PS1
Vin
Vin
ENABLE
ENABLE
To Tracking
circuit
20K
30.1K
Figure 12. PS1 and PS2 track output voltage Simultaneous start-up for type C
Figure 13. Simultaneous Power up Figure 14. Simultaneous Power down
Table 5. : Vref definition
Voset,ps2
Vref
0.7525
0.3
1.2
0.48
1.5
0.6
1.8
0.72
2.5
1.0
3.3
1.32
5.0
2.0
PS1
PS2
PS1
PS2