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參數(shù)資料
| 型號： | LTC2925 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Octal Bus Transceiver With 3-State Outputs 20-TSSOP -40 to 85 |
| 中文描述： | 四路電源排序器 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 190K |
| 代理商： | LTC2925 |
LTC2924
8
2924f
logic, which starts the charge pump and enables OUT1 to
turn on the first power supply. The power good timer
circuit is also enabled by turning off the switch that is
shorting the external capacitor to ground and enabling a
5
μ
A current source to charge the C
PGT
capacitor.
The output circuit responds by opening a switch, which is
shorting the OUT1 pin to ground and enabling a 10
μ
A
current source, which is connected to the charge pump.
The OUT1 pin can be connected to either the shutdown pin
of a power supply or the gate of a N-channel MOSFET that
is in series with the output of the sequenced power supply.
As the power supply turns on, the resistive divider con-
nected to the IN1 pin starts to drive up the voltage at the
IN1 pin. When the voltage at this pin exceeds 0.61V, the
comparator signals the logic that the first power supply is
on. At this time a current is sourced out of the IN1 pin
which serves as the hysteresis current for the input
comparator. This allows the application to choose a lower
Power Off voltage sense during the Power Off sequence.
The power good timer (PGT) circuit is signaled and resets
the PGT capacitor. The timer circuit is enabled and the
cycle repeats until the last power supply has turned on.
When the last power supply has turned on, the DONE pin
pull-down switch is turned on to signal that the Power On
sequence has completed.
If a power supply fails to turn on after it is enabled and the
voltage at the PGT pin exceeds 1V, the LTC2924 will
disable all power supplies by pulling all OUT pins to
ground. A fault condition will be indicated by the FAULT pin
pulling low.
The hysteresis current sourced at the ON pin and each IN
pin is set at the HYS/CFG pin. The current is determined
OPERATIOU
ON
TMR
OUT4
0.61V
0.61V
OUT3
OUT2
OUT1
IN4
IN3
IN2
IN1
DONE
0.61V
0.61V
0.61V
2924 F03
Figure 3. 4-Power Supply Power Off Sequence
by an external resistor nominally pulled to ground. The
hysteresis current is 0.5V/R
HYS
.
The Power Off sequence is initiated by pulling the ON pin
below 0.61V after a Power On sequence has completed
(see Figure 3). The Power Off sequence turns off the power
supplies in the reverse order of the Power On sequence.
OUT4 is turned off first. The timer function is used between
each supply being sequenced down. The PGT is not used.
The end of the Power Off sequence is indicated by the
LTC2924 floating the DONE pin.
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