參數(shù)資料
型號(hào)： LTC2924IGN
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： Quad Power Supply Sequencer
中文描述： 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
封裝： 0.150 INCH, PLASTIC, SSOP-16
文件頁(yè)數(shù)： 11/16頁(yè)
文件大小： 190K
代理商： LTC2924IGN
LTC2924
11
2924f
Details of Resistor Calculations
In this example, the voltage at the IN pins is 0.61V when
the LTC2924 detects that the power supply is On during a
Power On sequence or Off during a Power Off sequence.
The delta voltage,
V, represents the difference:
V = 2.2V – 1V = 1.2V
This delta voltage on R
B
will be equal to the hysteresis
current I
HYS
. Therefore:
V
I
A
HYS
μ
50
The current I
RB
at the Power On voltage of 2.2V is:
R
V
k
B
=
=
=
1 2
.
24
I
V
V
k
A
RB
=
=
μ
2 2
.
–0 61
24
66
During the Power On sequence, I
HYS
= 0, so I
FB
is equal to
I
RB
and R
A
is:
R
A
k
A
=
μ
=
0 61
66
9 2
.
.
V
OFF
Precaution
Use caution if designs call for V
OFF
voltages less than
~0.8V. Many loads stop using significant current below
this level, and the power supply may take a long time to go
below this voltage. If V
OFF
voltages at or less than this
voltage are necessary, consider adding an extra resistive
load at the output of the power supply to ensure it
discharges in a reasonable amount of time.
Selecting the Timing Capacitor
During the Power On sequence, the timer is used to
create a delay between the time one supply reaches the
On threshold and the next supply is enabled. During the
Power Off sequence, the timer is used to create a delay
between the time one supply reaches the Off threshold
and the next supply is disabled. Select the timing capaci-
tor with the following equation:
C
TMR
(F) = t
DELAY
5000
–3
F/s
Leaving the TMR pin unconnected will generate the mini-
mum delay. The accuracy of the time delay will be affected
by the capacitor leakage (the nominal charge current is
5
μ
A) and capacitor tolerance. A low leakage ceramic
capacitor is recommended.
Selecting the Power Good Timer (PGT) Capacitor
During the Power On sequence, the PGT can be used to
detect the failure of a power supply to reach the desired On
voltage. The PGT is enabled each time a power supply is
enabled by the OUT1-OUT4 pins. The PGT is reset each
time an IN1-IN4 pin detects that a power supply is at the
desired On voltage. Select the PGT timeout capacitor with
the following equation:
C
PGT
(F) = t
PGT
5000
–3
F/s
If no PGT is desired, the PGT pin must be shorted to
ground. The accuracy of the PGT timeout will be affected
by the capacitor leakage (the nominal charge current is
5
μ
A) and capacitor tolerance. A low leakage ceramic
capacitor is recommended.
Cascading Multiple LTC2924s
Two or more LTC2924s may be cascaded to fully se-
quence 8,12 or more power supplies. Figures 7 and 8
show how to configure the LTC2924 to sequence 8 and 12
power supplies. To sequence more power supplies, use
the circuit in Figure 8 and add more LTC2924s in the
middle.
Notice that the lastLTC2924 in the cascade string must
have a pull-up resistor on the DONE pin. Any LTC2924 that
is not the firstin the cascade string should have the
hysteresis current setting resistor, R
HYS
, pulled to V
CC
instead of ground. The value of the R
HYS
resistor remains
unchanged. The FAULT pins should all be connected
together and pulled up with a single 10k resistor.
All V
CC
pins for the LTC2924s in the cascade chain must
be connected to the same power supply.
APPLICATIU
W
U
U
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC2924IGN#PBF 功能描述:IC POWER SUPPLY SEQUENCER 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LTC2924IGN#TRPBF 功能描述:IC POWER SUPPLY SEQUENCER 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LTC2925CGN 功能描述:IC PWR SUPPLY CONTROLLER 24SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LTC2925CGN#PBF 功能描述:IC PWR SUPPLY CONTROLLER 24SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LTC2925CGN#TR 功能描述:IC PWR SUPPLY CONTROLLER 24SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
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