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参数资料
| 型号： | DC1029A |
| 厂商： | Linear Technology |
| 文件页数： | 14/32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
OPERATIO
good timer starts with the first enable output pulling low
and is cleared when the last supply monitor input crosses
its sequence-down threshold. A sequence-down fault pulls
FLT and all enable outputs low. Use a single capacitor from
PTMR to ground to select the power good time. To disable
the power good timer, tie PTMR to ground.
All comparator outputs pull low at the start of the
sequence-down phase (ON low). If a sequence-down fault
occurs, use the fault report capability to determine which
Table 1. Input Polarity Selection
supply failed to meet threshold (or other source of fault).
Force all supplies down in an un-sequenced manner by
pulling FLT low (external fault). For more details refer to
the Applications Information and discussion on system
faults later in this document.
After the system has clocked through “time position 1”,
the last LTC2928 (defined by a 2.4k to 5.1k pull-up resis-
tor on DONE ) releases the pull down on DONE and DONE
pulls high.
V1
+ ADJ (0.5V)
– ADJ (0V)
V2
+ ADJ (0.5V)
+ ADJ (0.5V)
V3
+ ADJ (0.5V)
+ ADJ (0.5V)
V4
+ ADJ (0.5V)
+ ADJ (0.5V)
VSEL
GND
V CC
Table 2. Master/Slave Configuration Pin s
Master
Slave
First Not First
Cascade Position Cascade Position
RST Pulls FLT
RST Does not
Pull FLT
No Shutdown
Debug Mode*
MS1
MS2
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
GND
GND
GND
Open
Open
Open
GND
Open
V CC
GND
Open
V CC
●
●
●
●
●
●
●
●
●
●
●
●
V CC
V CC
V CC
GND
Open
V CC
* No shutdown debug mode. In this mode, any internal or external fault will halt the system with full fault reporting but all enabled supplies remain enabled.
Table 3. Sequence Time Position Resistors (1%)
Table 4. Sequencing Threshold Selection
(% of 0.5V for ADJ, % of REF for –ADJ)
Position Number
1
2
3
4
5
6
7
8
RT (k ? )
95.3
42.2
24.3
15.0
9.53
6.04
3.40
1.50
Sequence-Up (%)
100
100
100
100
67
67
67
67
33
Sequence-Down (%)
100
67
33
10
100
67
33
10
100
SQT1
V CC
Open
Open
Open
V CC
GND
GND
GND
V CC
SQT2
V CC
V CC
Open
GND
Open
V CC
Open
GND
GND
2928f
14
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