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参数资料
| 型号： | DC1029A |
| 厂商： | Linear Technology |
| 文件页数： | 16/32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
V CC
Shouldmultiplechannelsfaultsimultaneously,thereported
channel is given priority according to the channel number
(1,2,3,4).
In the event of an external fault, the LTC2928 fault manager
reports overvoltage channels to the fault channel outputs
(CMP3, CMP4). If no channel is overvoltage, the default
report is channel 4 (High, High). As such, in certain ap-
plications, a potential reporting ambiguity exists.
Operating without Pass Transistors
The LTC2928 enable outputs may directly drive the shut-
down/enable, run/soft-start or control inputs on DC/DC
converters. However, since the LTC2928 enable outputs
may drive to a relatively high voltage with low current
(10 μ A), care must be taken not to exceed the maximum
voltage rating on the DC/DC converter enable input. The
gate voltage available from the LTC2928 enable output
ranges between V CC + 4.5V to V CC + 6V. Use a resistor
to limit an enable output to an external supply voltage. A
resistor between 4.7k and 27k is recommended.
It is important not to corrupt these communication lines
with added passive or active loads.
CAS Connection: Supply Extension
When more than four supplies need to be synchronized
in time, use the CAS connection. Consider the application
in Figure 1. This application allows for 8 supplies in 8
distinct time positions, or all at once depending upon the
choice of RT resistors. The upper device is designated as
master and the lower device is the slave. Both LTC2928s
are configured as “FIRST” and “LAST” and the CAS pins
are tied together.
(MASTER/FIRST)
LTC2928
ON
V CC
RT1
RT2 DONE
RT3
RT4 STMR
CAS
Cascading Multiple LTC2928s
LTC2928s can be cascaded in two ways, simultaneously.
The first method, time extension, allows an unlimited
number of supplies to be sequenced in additional time
positions. The second method, supply extension, allows
additional supplies to be sequenced in the same time po-
sition. The examples below demonstrate how to achieve
time and supply extension.
V CC
CAS
ON
RT1
RT2 DONE
RT3
RT4
LTC2928
(SLAVE/FIRST)
V CC
2928 F01
Central to configuring a cascade application is the assign-
ment of LTC2928 properties such as master/slave and
first/not-first/last status. Master/Slave and first/not-first
designation is made with the MS1 and MS2 three-state
configuration inputs (see Table 2). An LTC2928 is con-
figured as “LAST” by pulling DONE to V CC with a 2.4k to
5.1k resistor.
Next, the appropriate connection of one or both bidirectional
communication lines must be made. To achieve supply
extension, the CAS pins between master and slave devices
are tied together (Figure 1). To achieve time extension, the
DONE pin of the preceding LTC2928 is connected to the
ON pin of the subsequent LTC2928 (Figure 2). Both con-
nections are allowed to exist within one system (Figure 4).
16
Figure 1. Using the CAS pin to
synchronize additional power supplies
(slave STMR is not used).
The master controls the sequencing. The time delay be-
tween adjacent positions is configured with a capacitor
on the master’s STMR pin and the slave STMR is ignored.
After application of the ON signal to start the sequence-up
phase, the CAS pin pulls low, enabling any supply config-
ured for time position 1. After supplies in time position 1
cross their sequence-up threshold, CAS is released and
pulled high. If no supplies are configured for a particular
time position, CAS pulls high after 25 μ s. CAS remains
high for one STMR period (100 μ s minimum) and then
pulls low again to enable supplies in time position 2. The
2928f
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