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LTC2925IGN bảng dữ liệu(PDF) 15 Page - Linear Technology

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Giải thích chi tiết về linh kiện  Multiple Power Supply Tracking Controller with Power Good Timeout
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LTC2925IGN bảng dữ liệu(HTML) 15 Page - Linear Technology

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LTC2925
15
2925f
Offset Tracking Example
Converting the circuit in the coincident tracking example
to the offset tracking shown in Figure 15 is relatively simple.
Here the 1.8V slave 1 supply ramps up 1V below the mas-
ter. The ramp rate remains the same (100V/s), so there are
no changes necessary to steps 1 and 2 of the 3-step design
procedure. Only step 3 must be considered. Be sure to
verify that the chosen voltage offsets will allow the slave
supplies to ramp up completely. In this example, if the
voltage offset were 2V, the slave supply would only ramp
up to 3.3V – 2V = 1.3V.
3.
Choose RTA to obtain the desired delay.
First, convert the desired voltage offset, VOS, to a delay, tD,
using the ramp rate:
t
V
S
V
Vs
ms
D
OS
S
==
=
1
100
10
6
()
APPLICATIO S I FOR ATIO
From Equation 4:
R
Vk
ms
V s
k
TA
″ ==
0 8
16 5
1
100
13 2
.•
.
•
.
From Equation 5:
Rk
k
k
TA =≈
13 1
132
665
.||
.
.
Figure 15. Offset Tracking from Figure 16
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
16.5k
RTB2
88.7k
RFA2
41.2k
2.5V
SLAVE2
MASTER
RFB2
88.7k
RTA2
31.6k
RTB3
86.6k
RTA3
31.6k
RTA1
6.65k
RONA
100k
RAMPBUF
TRACK1
TRACK2
TRACK3
FB2
GATE
LTC2925
PGTMR
CSDTMR
0.082
µF
SDTMR
CSCTMR
0.41
µF
SCTMR
GND
2925 F16
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 16. Offset Tracking Example
10ms/DIV
2925 F15b
10ms/DIV
2925 F15a
1V/DIV
1V/DIV



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