參數(shù)資料
型號(hào)： LTC2927CDDB#TRM
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
封裝： 3 X 2 MM, PLASTIC, MO-229WECD-1, DFN-8
文件頁(yè)數(shù)： 2/16頁(yè)
文件大小： 264K
代理商： LTC2927CDDB#TRM
LTC2927
10
2927fb
This example converts the coincident tracking example to
the ratiometric tracking prole shown in Figure 11. The
ramp rate of the master signal remains unchanged (Step
1) and there is no delay in ratiometric tracking (Step 3),
so only the result of step 2 in the 3-step design procedure
needs to be considered. In this example, the ramp rate of the
1.8V slave 1 supply ramps up at 60V/s and the 2.5V slave 2
supply ramps up at 85V/s. Always verify that the chosen
ramp rate will allow the supplies to ramp-up completely
before RAMPBUF reaches VCC. If the 1.8V supply were
to ramp-up at 50V/s it would only reach 1.65V because
the RAMPBUF signal would reach its nal value of VCC =
3.3V before the slave supply reached 1.8V.
2. Solve for the pair of resistors that provide the desired
slave supply behavior, assuming no delay.
From Equation 2:
Rk
Vs
k
TB
=
16 5
100
60
27 4
.
/
.
ΩΩ
From Equation 3:
R
V
k
V
k
V
k
TA
′ =
+
≈
08
1 235
16 5
1 235
35 7
08
27 4
10
.
ΩΩ
Ω
Step 3 is unnecessary because there is no delay, so
RTA = RTA’
Figure 11. Ratiometric Tracking (from Figure 12)
1V/DIV
10ms/DIV
SLAVE1
MASTER
SLAVE2
2927 F11
10ms/DIV
1V/DIV
MASTER
3.3V
RONB
138k
RONA
100k
ON
RAMP
SLAVE1
1.8V
VCC
3.3V
EARLY VIN
3.3V
LTC2927
GND
SDO
RUN/SS
FB
IN
DC/DC
FB = 1.235V
OUT
RAMPBUF
TRACK
0.1μF
RTB1
27.4k
RFB1
16.5k
RFA1
35.7k
RTA1
10k
ON
RAMP
SLAVE2
2.5V
2927 F12
VCC
3.3V
EARLY
3.3V
LTC2927
GND
SDO
RUN/SS
FB
IN
DC/DC
FB = 0.8V
OUT
RAMPBUF
TRACK
0.1μF
RTB2
1M
RFB2
887k
RFA2
412k
RTA2
383k
Ratiometric Tracking Example
APPLICATIO S I FOR ATIO
WU
U
Figure 12. Ratiometric Tracking Example
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參數(shù)描述
LTC2927CTS8#PBF 制造商:Linear Technology 功能描述:Power Supply 8-Pin TSOT-23 制造商:Linear Technology 功能描述:MS-System Monitor/Other, Cut Tape Single Power Supply Tracking Controller
LTC2927CTS8#TR 功能描述:IC POWER SUPPLY CTRLR TSOT23-8 RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LTC2927CTS8#TRM 功能描述:IC POWER SUPPLY CTRLR TSOT23-8 RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LTC2927CTS8#TRMPBF 功能描述:IC POWER SUPPLY CTRLR TSOT23-8 RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LTC2927CTS8#TRPBF 功能描述:IC POWER SUPPLY CTRLR TSOT23-8 RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
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