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参数资料
| 型号： | LTC2927CDDB#TRM |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | 3 X 2 MM, PLASTIC, MO-229WECD-1, DFN-8 |
| 文件页数： | 3/16页 |
| 文件大小： | 264K |
| 代理商： | LTC2927CDDB#TRM |
LTC2927
11
2927fb
Converting the circuit in the coincident tracking example
to the offset tracking shown in Figure 13 is relatively
simple. Here the 1.8V slave 1 supply ramps up 1V below
the master. 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 offset will allow
the slave supply to ramp up completely. In this example,
if the voltage offset were 2V, the slave supply would only
ramp to 3.3V – 2V = 1.3V.
3. Choose RTA to obtain 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
/
()
From Equation 4:
R
Vk
ms
V s
k
TA
″ =
=
0 8
16 5
10
100
13 2
..
/
.
Ω
From Equation 5:
Rk
k
TA
=≈
13 1
132
665
..
.
ΩΩ
Ω
Figure 13. Offset Tracking (from Figure 14)
1V/DIV
10ms/DIV
MASTER
SLAVE1
SLAVE2
2927 F13
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
16.5k
RFB1
16.5k
RFA1
35.7k
RTA1
6.65k
ON
RAMP
SLAVE2
2.5V
2927 F14
VCC
3.3V
EARLY
3.3V
LTC2927
GND
SDO
RUN/SS
FB
IN
DC/DC
FB = 0.8V
OUT
RAMPBUF
TRACK
0.1μF
RTB2
887k
RFB2
887k
RFA2
412k
RTA2
316k
Offset Tracking Example
APPLICATIO S I FOR ATIO
WU
U
Figure 14. Offset Tracking Example
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| 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 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
| LTC2927CTS8#TRM | 功能描述:IC POWER SUPPLY CTRLR TSOT23-8 RoHS:否 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
| LTC2927CTS8#TRMPBF | 功能描述:IC POWER SUPPLY CTRLR TSOT23-8 RoHS:是 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
| LTC2927CTS8#TRPBF | 功能描述:IC POWER SUPPLY CTRLR TSOT23-8 RoHS:是 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
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