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LTC2925IGN bảng dữ liệu(PDF) 16 Page - Linear Technology

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LTC2925IGN bảng dữ liệu(HTML) 16 Page - Linear Technology

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LTC2925
16
2925f
APPLICATIO S I FOR ATIO
Supply Sequencing Example
In Figure 17, the three slave supplies are sequenced in-
stead of tracking. As in the coincident tracking example,
the 3.3V master supply ramps up at 100V/s through an
external FET, so step 1 remains the same. The 1.8V slave
1 supply ramps up at 1000V/s beginning 10ms after the
master signal starts to ramp up. The 2.5V slave 2 supply
ramps up at 1000V/s beginning 20ms after the master
signal begins to ramp up. The 1.5V slave 3 supply ramps
up at 1000V/s beginning 25ms after the master signal
begins to ramp up. Note that not every combination of
ramp rates and delays is possible. Small delays and large
ratios of slave ramp rate to master ramp rate may result in
solutions that require negative resistors. In such cases,
either the delay must be increased or the ratio of slave
ramp rate to master ramp rate must be reduced. In this
example, solving for the slave 1 supply yields:
2.
Solve for the pair of resistors that provide the desired
slave supply behavior, assuming no delay.
From Equation 2:
Rk
Vs
Vs
k
TB =•
≈
16 5
100
1000
165
..
From Equation 3:
R
V
V
k
V
k
V
k
k
TA ′=
+
≈
08
1 235
16 5
1 235
35 7
08
165
213
.
.
.
.
.
–
.
.
–.
3.
Choose RTA to obtain the desired delay.
From Equation 4:
R
Vk
ms
V s
k
TA
″ ==
08
165
10
100
132
.• .
•
.
From Equation 5:
Rk
k
k
TA =≈
–.
|| .
.
213
1 32
348
Figure 17. Supply Sequencing from Figure 18
MASTER
SLAVE2
SLAVE1
SLAVE3
0.015
Ω
Q1
Si4412ADY
0.1
µF
CPGTMR
0.82
µF
10k
VCC SENSEP SENSEN
3.3V
VIN
3.3V
RONB
154k
3.3V VIN
RTB1
1.65k
RTB2
8.87k
RFA2
41.2k
2.5V
SLAVE2
MASTER
RFB2
88.7k
RTA2
4.87k
RTB3
8.66k
RTA3
3.74k
RTA1
3.48k
RONA
100k
RAMPBUF
TRACK1
TRACK2
TRACK3
FB2
GATE
LTC2925
PGTMR
CSDTMR
0.082
µF
SDTMR
CSCTMR
0.41
µF
SCTMR
GND
2925 F18
RAMP
RFA3
100k
1.5V
SLAVE3
RFB3
86.6k
DC/DC
IN
FB = 0.8V
OUT
DC/DC
IN
FB = 0.8V
RUN/SS
RUN/SS
OUT
FB3
3.3V
PGI
RFA1
35.7k
1.8V
SLAVE1
RFB1
16.5k
SUPPLY
MONITOR
DC/DC
IN
FB = 1.235V
RUN/SS
OUT
FB1
FAULT
ON
10k
VIN
STATUS
REMOTE
RST
SD3
SD2
SD1
CGATE
0.1
µF
10
Ω
Figure 18. Supply Sequencing Example
10ms/DIV
2925 F17b
10ms/DIV
2925 F17a
1V/DIV
1V/DIV



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