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ISL6123IRZA датащи(PDF) 9 Page - Intersil Corporation

номер детали ISL6123IRZA
подробное описание детали  Single Supply Integrated Current Limiting Controller
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производитель  INTERSIL [Intersil Corporation]
домашняя страница  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL6123IRZA датащи(HTML) 9 Page - Intersil Corporation

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9
FN9005.4
June 10, 2005
1. Using the ISL6123IR or ISL6124IR
2. The four supplies being sequenced are 5V (IN_A), 3.3V
(IN_B), 2.5V (IN_C) and 1.5V (IN_D), the UVLO levels
are ~ 80% of nominal voltages. Resistors chosen such
that the total resistance of each divider is ~ 10K using
standard value resistors to approximate 80% of
nominal = 0.63V on UVLO input.
3. The desired order turn-on sequence is first both 5V and
3.3V supplies together and then the 2.5V supply about
75ms later and lastly the 1.5V supply about 45ms later.
4. The desired turn-off sequence is first both 1.5V and 3.3V
supplies at the same time then the 2.5V supply about
50ms later and lastly the 5V supply about 72ms after that.
All scope shots taken from ISL612xSEQEVAL1 board.
Figures 7 and 8 illustrate the desired turn-on and turn-off
sequences respectively. The sequencing order and delay
between voltages sequencing is set by external capacitance
values so other than illustrated can be accomplished.
Figures 9 and 10 illustrate the timing relationships between
the EN input, RESET#, DLY and GATE outputs and the
VOUT voltage for a single channel being turned on and off
respectively. RESET# is not shown in Figure 9 as it asserts
160ms after the last GATE goes high.
All IC family variants share similar function for DLY_X
capacitor charging, GATE and RESET# operation. Figures
11 through 14 illustrate the principal feature and functional
differences for each of the ISL6125, ISL6126, ISL6127 and
ISL6128 variants, each is described below.
Figure 11 features the 6125 open drain outputs being
sequenced on and off along with RESET# relatiionship
which is similar to all other family variants.
Figure 12 illustrates the independent input feature of the
ISL6126 which allows once the EN# is low for each UVLO to
be individually satisfied and for its associated GATE to turn-
on. Only when the last variable VIN is satisfied as shown
does the RESET# release to signal all input voltages are
valid.
Figure 13 shows the ISL6127 pre programmed ABCD on
DCBA off order of sequencing with minimal non adjustable
delay between each.
Figure 14 demonstrates the independence of the redundant
two rail sequencer. It shows that either one of the two groups
can be turned off and the ABCD order of restart with
capacitor programmable delay once both EN inputs are
pulled low.
Typical Performance Waveforms
FIGURE 7. ISL6124 SEQUENCED TURN-ON
FIGURE 8. ISL6124 SEQUENCED TURN-OFF
1V/DIV
40ms/DIV
5VOUT
3.3VOUT
2.5VOUT
RESET#
ENABLE#
1.5VOUT
1V/DIV
20ms/DIV
5VOUT
3.3VOUTPUT
2.5VOUT
1.5VOUT
ENABLE#
ISL6123, ISL6124, ISL6125, ISL6126, ISL6127, ISL6128


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