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LTC2926IGN 数据表(PDF) 21 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) 21 Page - Linear Technology

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LTC2926
21
2926fa
Offset Tracking Example
Converting the circuit in the coincident tracking example to
the offset tracking profile shown in Figure 17 is relatively
simple. Here the 1.8V slave supply ramps up 1V below the
master, and the 2.5V slave supply ramps up 0.5V below
the master. The ramp rate remains the same (100V/s), as
do the slave supplies’ minimum load resistances, so there
are no changes necessary to steps 1 or 2 of the three-step
APPLICATIO S I FOR ATIO
Figure 17. Offset Tracking Waveforms from Figure 18 Circuit
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 on the 1.8V supply were 2V, it could
ramp up only to 3.3V – 2V = 1.3V.
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
100
15
.
ΩΩ
Choose RTB = 15.0kΩ.
Since offset is required, Equation 5a applies:
ΔV = 1.0V
From Equation 6:
R
V
V
k
V
k
V
k
TA =
+−+
08
08
15 0
08
953
08
15 0
1
.
.
.
.
.
.
.
.
ΩΩΩ
0
0
15 0
531
V
k
k
.
.
Ω
Ω
=
Choose RTA = 5.36kΩ.
500mV/DIV
MASTER
SLAVE2
SLAVE1
5ms/DIV
2926 F17
500mV/DIV
5ms/DIV
Figure 18. Offset Tracking Example
RTB1
15.0k
RTA1
5.36k
2926 F18
LTC2926
S1
FB1
RAMPBUF
TRACK1
TRACK2
GND
PGTMR
VIN
RTB2
15.0k
RTA2
4.64k
FAULT
10k
CPGTMR
1
µF
CMGATE
0.1
µF
MGATE
0.1
µF
10
Ω
VCC
RAMP
VIN
STATUS
STATUS/PGI
ON
ON/OFF
NC
RSGATE
10k
3.3V VIN
Q0
IRF7413Z
SGATE2
10
Ω
Q2
IRF7413Z
SGATE1
10
Ω
3.3V
MASTER
D1
RFB1
15.0k
RFA1
9.53k
S2
FB2
D2
RFB2
15.0k
RFA2
5.76k
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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