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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： | 16/16页 |
| 文件大小： | 264K |
| 代理商： | LTC2927CDDB#TRM |
LTC2927
9
2927fb
Figure 9. Coincident Tracking (from Figure 10)
A typical application is shown in Figure 10. The master
signal is a 3.3V ramp generated by the LTC2927. The
slave 1 supply is a 1.8V switching power supply and the
slave 2 supply is a 2.5V switching power supply. Both
slave supplies track coincidently with the 3.3V ramping
master signal. The ramp rate of the supplies is 100V/s.
The 3-step design procedure detailed previously can be
used to determine component values. Only the slave 1
supply is considered here as the procedure is the same
for the slave 2 supply.
1. Set the ramp rate of the master signal.
From Equation 1:
C
A
Vs
F
RAMP
==
μ
10
100
01
μ
/
.
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
16 5
.
/
.
ΩΩ
From Equation 3:
R
V
k
V
k
V
k
TA
′ =
+
≈
08
1 235
16 5
1 235
35 7
08
16 5
13
.
ΩΩ
Ω
3. Choose RTA to obtain desired delay.
Since no delay is desired, RTA = RTA’
In this example, the supply remains low while the ON pin
is held below 1.23V. When the ON pin rises above 1.23V,
10μA pulls up the master signal on CRAMP at 100V/s.
The master signal is buffered from the RAMP pin to the
RAMPBUF pin. As this output and the RAMPBUF pin rise,
the current from the TRACK pin is reduced. Consequently,
the voltage at the slave supply’s output is increased, and
the slave supply tracks the master signal. When the ON
pin is again pulled below 1.23V, 10μA will pull down CRAMP
at 100V/s. If the loads on the outputs are sufcient, all
outputs will track down coincidently at 100V/s.
Figure 10. Coincident Tracking Example
1V/DIV
10ms/DIV
MASTER
SLAVE1
SLAVE2
2927 F09
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
13k
ON
RAMP
SLAVE2
2.5V
2927 F10
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
412k
Coincident Tracking Example
APPLICATIO S I FOR ATIO
WU
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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) |
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