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参数资料
| 型号： | DC1029A |
| 厂商： | Linear Technology |
| 文件页数： | 18/32页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR LTC2928 |
| 设计资源： | DC1029A Design File DC1029A Schematic |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电源监控器/跟踪器/序列发生器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | LTC2928 |
| 主要属性： | 4 通道电源定序器 |
| 已供物品： | 板 |
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LTC2928
APPLICATIO S I FOR ATIO
I EN (10uA)
Anotherinterestingapplicationcombinestheusageofboth
the CAS pin connection and the DONE —ON communica-
tions link. Figure 4 shows a two dimensional configura-
tion of four LTC2928s that allows for 16 supplies to be
sequenced in up to 16 time positions.
16 SUPPLIES, 16 TIME POSITIONS
Using an Enable Line to Generate a Sequencing-Up Delay
LTC2928
V CC RT2 EN2
(MASTER/FIRST)
LTC2928
ON
(MASTER/NOT FIRST)
LTC2928
ON
V CC
V 2
C DEL
2928 F05
DONE
DONE
Figure 5. Adjustable Sequencing Delay
ON
CAS
CAS
STMR
V CC
ON
CAS
CAS
STMR
V CC
An arbitrary delay between enables may be added by
using an enable pull-up current (10 μ A) to charge a delay
capacitor (Figure 5). Position the delay using an RT resis-
tor. Assuming 100% sequencing thresholds (0.5V) and
a fully discharged delay capacitor (C DEL ), the added time
delay (T DEL ) is:
DONE
DONE
T DEL ( ms ) = 50 ? C DEL ( μ F )
LTC2928
(SLAVE/FIRST)
LTC2928
(SLAVE/FIRST)
Be sure to account for the extra delay when using the
power-good timer (PTMR).
Figure 4. Two-dimensional application.
2928 F04
Extending Sequencing Delay to Subsequent Supplies
In this application, both slave devices are clocked by the
masters through their CAS pins. Again, sequencing-up
begins with ON pulling high. Although the ON input is high
on the device in the lower right quadrant, sequencing-up
will not begin there until the first master (upper left), and
its slave are finished sequencing-up. At that time the
DONE pin will pull up the ON pin of the second master.
The second master and slave will then start sequencing
up their supplies.
Sequencing delays can be extended after certain events by
paralleling capacitance to the STMR pin. Figure 6 shows
one way to add capacitance after a particular enable output
pulls high.
V CC
LTC2928 RESISTOR LIMITS
GATE VOLTAGE
EN2
STMR
C STMR
C ADD
2928 F06
Figure 6. Adding STMR capacitance
2928f
18
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相关代理商/技术参数 |
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|---|---|
| DC1029A | 制造商:Linear Technology 功能描述:EVAL BOARD, LTC2928 QUAD POWER SUPPLY SE |
| DC102F2K | 制造商:U S SENSOR 功能描述:thermistor |
| DC102K | 制造商:RAYTHN 功能描述: |
| DC102R | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| DC-102R | 制造商:未知厂家 制造商全称:未知厂家 功能描述:1.8watt 24pins DIP/DIL |
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