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参数资料
| 型号： | LTC2928CUHF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 19/32页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY SEQUENCER 38-QFN |
| 标准包装： | 2,500 |
| 类型： | 序列发生器 |
| 监视电压数目： | 4 |
| 复位： | 低有效 |
| 复位超时： | 最小为 5 ms |
| 电压 - 阀值： | 可调节/可选择 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 38-WFQFN 裸露焊盘 |
| 供应商设备封装： | 38-QFN（5x7） |
| 包装： | 带卷 (TR) |
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LTC2928
APPLICATIO S I FOR ATIO
+
V CC
RT1
V 1
CorrectingforIRDrops
Sense feedback is common in high current applications.
Parasitic resistance coupled with high currents causes volt-
age drops. The sense pin of a power module is designed
to help regulate the voltage at a point in the distribution
circuitry beyond the voltage drops. The output of the power
module is raised until the desired voltage is achieved at
the sense point. During startup with sense feedback,
large inrush currents may cause the output of the power
module to exceed its maximum output. This may cause
the module to shutdown.
The LTC2928 is easily configured to enable a sense tran-
sistor after a power supply has been sequenced on and
inrush currents have diminished (Figure 7). The sense
transistor feeds the sequenced supply voltage back to the
sense line of the power module. The power module will
raise its output to compensate for voltage drops across
the sequencing transistor and other parasitics.
Discharging Load Capacitance
It is often necessary to discharge load capacitance quickly.
Use the pull-down strength of the LTC2928 enable outputs
to achieve faster turn-off times. Sequence the enable
outputs in the same time position (RT resistors are iden-
tical). With the connections shown in Figure 8, EN1 is
used to discharge the load capacitance through its 100 ?
on resistance. If shorter discharge time is required, use
external inverters as shown in Figure 9.
POWER V OUT
MODULE
SD LOAD
EN2
EN1
LTC2928
RT2 V 2
2928 F08
V CC
+
Duringthesequence-downphase,thesensetransistorwill
be disconnected before the supply sequencing transistor.
If the supply transistor were to be disconnected first, the
power module would sense the voltage drop and may
attempt to drive higher in order to compensate.
Figure 8. Load Capacitance Discharge
POWER V OUT
MODULE
SD
LOAD
V CC
RT1
RT2
EN2
LTC2928
EN1
V 1
V 2
IRF530
2N7002
POWER
MODULE
OUT +
I OUT
PARASITIC
R DS(ON) RESISTANCE
V OUT
2928 F09
V CC
SENSE+
100 100
EN2 V2 EN1
LTC2928
RT1 V 1
RT2
2928 F07
Figure 7. Correcting for IR drops
(RT1 > RT2)
Figure 9. Fast Load Capacitance Discharge
Using the Power Module Voltages to Gate the
Sequenced Supplies
The application shown in Figure 10 demonstrates how the
power module outputs can be enabled and monitored for
compliance, and then passed to various loads. Sequencing
up and down is controlled by the level of the 12V sup-
ply. Sequencing up begins at 10.76V. If the application is
disconnected from the 12V supply, an orderly shutdown
will commence when the 12V supply drops to 10.43V.
The blocking diode (D1) allows the 470 μ F capacitor (C1)
to retain enough energy to complete the sequence down
process.
2928f
19
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| LTC2928IG#TRPBF | 功能描述:IC PWR SUPPLY SEQUENCER 36SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
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| LTC2928IUHF#PBF | 功能描述:IC PWR SUPPLY SEQUENCER 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 其它有关文件:STM6905 View All Specifications 标准包装:1 系列:- 类型:多压监控器 监视电压数目:5 输出:开路漏极或开路集电极 复位:低有效 复位超时:最小为 140 ms 电压 - 阀值:2.188V，2.955V，可调，可调，可调 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-TSSOP 包装:Digi-Reel® 产品目录页面:1197 (CN2011-ZH PDF) 其它名称:497-8728-6 |
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