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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： | 6/16页 |
| 文件大小： | 264K |
| 代理商： | LTC2927CDDB#TRM |
LTC2927
14
2927fb
Start-Up Delays
Often power supplies do not start-up immediately when
their input supplies are applied. If the LTC2927 tries to
ramp-up these power supplies as soon as the input sup-
ply is present, the start-up of the outputs may be delayed,
defeating the tracking circuit (Figure 18). Often this delay is
intentionally congured by a soft-start capacitor. This can
be remedied either by reducing the soft-start capacitor on
the slave supply or by including a capacitor in the ON pin’s
resistive divider to delay the ramp up. See Figure 19.
Figure 20. Layout Considerations
Layout Considerations
Be sure to place a 0.1μF bypass capacitor as near as pos-
sible to the supply pin of the LTC2927.
To minimize the noise on the slave supply’s output, keep
the trace connecting the FB pin of the LTC2927 and the
feedback node of the slave supply as short as possible.
In addition, do not route this trace next to signals with
fast transition times. In some circumstances it might be
advantageous to add a resistor near the feedback node of
the slave supply in series with the FB pin of the LTC2927.
This resistor must not exceed:
R
VV
I
V
RR
SERIES
FB
MAX
FB
FA
FB
=
=
()
15
1
..
This resistor is most effective if there is already a ca-
pacitor at the feedback node of the slave supply (often a
compensation component). Increasing the capacitance on
a slave supply’s feedback node will further improve the
noise immunity, but could affect the stability and transient
response of the supply.
VCC
2927 F20
LTC2927
FB
GND
DC/DC
FB
OUT
0.1μF
MINIMIZE
TRACE
LENGTH
RFB
RFA
RSERIES
APPLICATIO S I FOR ATIO
WU
U
Figure 18. Power Supply Start-Up Delayed
Figure 19. ON Pin Delayed
2927 F18
1V/DIV
20ms/DIV
MASTER
SLAVE
ON
2927 F19
1V/DIV
5ms/DIV
MASTER
SLAVE
ON
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 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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