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LTC2926IGN 数据表(PDF) 22 Page - Linear Technology

部件名 LTC2926IGN
功能描述  MOSFET-Controlled Power Supply Tracker
PDF  28 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC2926IGN 数据表(HTML) 22 Page - Linear Technology

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LTC2926
22
2926fa
APPLICATIO S I FOR ATIO
Supply Sequencing Example
In Figure 19, the two slave supplies are sequenced using a
master ramp signal. As in the ratiometric tracking example,
the master signal ramps up at 100V/s, and the minimum
slave loads are the same as the coincident example, so
steps 1 and 2 remain 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
starts 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.
3. Solve for the tracking resistors that set the desired ramp
rate and voltage offset or time delay of the slave supply.
From Equation 4:
Rk
Vs
Vs
k
TB =•
⎛
⎝⎜
⎞
⎠⎟
=
15 0
100
1000
15
..
ΩΩ
Choose RTB = 1.50kΩ.
Since a delay is required, Equation 5b applies:
ΔV = 100V/s • 10ms = 1V
From Equation 6:
R
V
V
k
V
k
V
k
V
TA =
+−+
08
08
15 0
08
953
08
150
1
.
.
.
.
.
.
.
ΩΩΩ 1150
296
.
.
k
k
Ω
Ω
=
Choose RTA = 2.94kΩ.
Note that the values of RFA2 and RFB2 are larger than those
of the Coincident Tracking Example. Larger feedback resis-
tor values resulted in larger tracking resistor values for
RTA2 and RTB2, which limits the maximum TRACK2 pin
current to <1mA; see Final Sanity Checks.
Figure 19. Supply Sequencing Waveforms from Figure 20 Circuit
500mV/DIV
SLAVE2
SLAVE1
5ms/DIV
2926 F19
500mV/DIV
5ms/DIV
Figure 20. Supply Sequencing Example
NC
RTB1
1.50k
RTA1
2.94k
2926 F20
LTC2926
S1
FB1
RAMPBUF
TRACK1
TRACK2
GND
PGTMR
VIN
RTB2
2.49k
RTA2
1.33k
FAULT
10k
CPGTMR
1
µF
CMGATE
0.1
µF
MGATE
0.1
µF
VCC
RAMP
VIN
STATUS
STATUS/PGI
ON
ON/OFF
RSGATE
10k
3.3V
VIN
SGATE2
10
Ω
Q2
IRF7413Z
SGATE1
10
Ω
D1
RFB1
15.0k
RFA1
9.53k
S2
FB2
D2
RFB2
24.9k
RFA2
9.53k
FAULT
OUT
IN
SENSE
RX1
100
Ω
1.8V MODULE
3.3V
Q1
IRF7413Z
1.8V
SLAVE1
OUT
IN
SENSE
RX2
100
Ω
2.5V MODULE
3.3V
2.5V
SLAVE2



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