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參數(shù)資料
| 型號(hào)： | LTC2927CDDB#TRM |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 3 X 2 MM, PLASTIC, MO-229WECD-1, DFN-8 |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 264K |
| 代理商： | LTC2927CDDB#TRM |
LTC2927
8
2927fb
RONB
138k
RONA
100k
ON
RAMP
MASTER
1.8V
2927 F07
VCC
VIN
EARLY
VIN
3.3V
LTC2927
GND
SDO
FB
RUN/SS
IN
DC/DC
FB = 1.235V
OUT
RAMPBUF
TRACK
0.1μF
CRAMP
10pF
RTB
16.5k
RFB
16.5k
RFA
35.7k
RTA
13k
Figure 7. SDO Shutdown Application
RONB
RONA
ON
RAMP
MASTER
SLAVE
2927 F08
VCC
VIN
EARLY
VIN
LTC2927
GND
FB
IN
DC/DC
FB
OUT
RAMPBUF
TRACK
0.1μF
CRAMP
RTB
RFB
RFA
RTA
Figure 8. Single Supply Application
SDO pulls low again when the ON pin is pulled below 1.23V
and the RAMP pin is below about 200mV.
3-Step Design Procedure
The following 3-step procedure allows one to complete
a design for any of the tracking or sequencing proles
shown in Figures 1 to 4. A basic single supply application
circuit is shown in Figure 8.
1. Set the ramp rate of the master signal.
Solve for the value of CRAMP, the capacitor on the RAMP
pin, based on the desired ramp rate (V/s) of the master
supply, SM.
C
I
S
where I
A
RAMP
M
RAMP
=≈ μ
10
1
()
2. Solve for the pair of resistors that provide the desired
ramp rate of the slave supply, assuming no delay.
Choose a ramp rate for the slave supply, SS. If the slave
supply ramps up coincident with the master signal or
with a xed voltage offset, then the ramp rate equals
the master supply’s ramp rate. Be sure to use a fast
enough ramp rate for the slave supply so that it will nish
ramping before the master signal has reached its nal
supply value. If not, the slave supply will be held below
the intended regulation value by the master signal. Use
the following formulas to determine the resistor values
for the desired ramp rate, where RFB and RFA are the
feedback resistors in the slave supply and VFB is the
feedback reference voltage of the slave supply:
RR
S
TB
FB
M
S
=
()
2
R
V
R
V
R
V
R
TA
TRACK
FB
FA
TRACK
TB
′ =
+
()
3
where VTRACK ≈ 0.8V.
Note that large ratios of slave ramp rate to master ramp
rate, SS/SM, may result in negative values for RTA’. If
sufciently large delay is used in step 3, RTA will be
positive, otherwise SS/SM must be reduced.
3. Choose RTA to obtain the desired delay.
If no delay is required, such as in coincident and ratio-
metric tracking, then simply set RTA = RTA’. If a delay
is desired, as in offset tracking and supply sequencing,
calculate RTA” to determine the value of RTA where tD
is the desired delay in seconds.
R
VR
tS
TA
TRACK
TB
DM
″ =
()
4
RR
R
TA
=
′″
||
( )
5
the parallel combination of RTA’ and RTA”.
Asnotedinstep2,smalldelaysandlargeratiosofslaveramp
rate to master ramp rate (usually only seen in sequencing)
may result in solutions with negative values for RTA. In such
cases, either the delay must be increased or the ratio of
slave ramp rate to master ramp rate must be reduced.
APPLICATIO S I FOR ATIO
WU
U
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| LTC2927CTS8#TR | 功能描述:IC POWER SUPPLY CTRLR TSOT23-8 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) |
| LTC2927CTS8#TRM | 功能描述:IC POWER SUPPLY CTRLR TSOT23-8 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) |
| LTC2927CTS8#TRMPBF | 功能描述:IC POWER SUPPLY CTRLR TSOT23-8 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) |
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