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ISL6126IRZA Fiches technique(PDF) 9 Page - Intersil Corporation

No de pièce ISL6126IRZA
Description  Power Sequencing Controllers
Download  23 Pages
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Fabricant  INTERSIL [Intersil Corporation]
Site Internet  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL6126IRZA Fiches technique(HTML) 9 Page - Intersil Corporation

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ISL6123, ISL6124, ISL6125, ISL6126, ISL6127, ISL6128, ISL6130
9
FN9005.11
August 25, 2011
If some of the rails are sequenced together to reduce cost and
eliminate the effect of capacitor variance on the timing, a
common capacitor can be connected to two or more DLY_ON or
DLY_OFF pins. In this case, multiply the capacitor value by the
number of common DLY_X pins to obtain the desired timing.
Table 1 shows the nominal time delay on the DLY_X pins for
various capacitor values, from the start of charging to the 1.27V
reference. This table does not include the 10ms of ENABLE
lockout delay during a start-up sequence, but it does represent
the time from the end of the ENABLE lockout delay to the start
of GATE transition. There is no ENABLE lockout delay for a
sequence-off, so this table illustrates the delay to GATE
transition from a disable signal.
Figure 4 shows the turn-on and Figure 5 shows the nominal
turn-off timing diagram of the ISL6123 and ISL6124.
The ISL6125 is similar to the ISL6124 except that, instead of
charge pumped GATE outputs, there are sequenced open-drain
outputs that can be pulled up to a maximum of VDD.
Delay and flexible sequencing possibilities include multiple series,
parallel, or adjustable capacitors that can be used to easily
fine-tune timing over that offered by standard value capacitors.
TABLE 1. NOMINAL DELAY TO SEQUENCING THRESHOLD
DLY PIN CAPACITANCE
TIME(s)
Open
0.00006
100pF
0.00013
1000pF
0.0013
0.01µF
0.013
0.1µF
0.13
1µF
1.3
10µF
13
NOTE: Nom. TDEL_SEQ = Capacitor (µF)*1.3MΩ.
FIGURE 4. ISL6123, ISL6124 TURN-ON AND GLITCH RESPONSE TIMING DIAGRAM
UVLO_B
UVLO_C
UVLO_D
ENABLE (ISL6123)
RESET
DLYON_A
DLYON_B
DLYON_C
DLYON_D
GATE_A
GATE_B
GATE_C
GATE_D
UVLO_A
VEN
DLY_Vth
DLY_Vth
DLY_Vth
DLY_Vth
VQPUMP
VQPUMP
VQPUMP
ENABLE (ISL6124)
VUVLOVth
VUVLOVth
VUVLOVth
VUVLOVth
tRSTdel
tUVLOdel
VQPUMP-1V
VQPUMP
<tFIL


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