參數(shù)資料
型號(hào)： LTC4260CSW
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： Positive High Voltage Hot Swap Controller with I2C Compatible Monitoring
中文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24
封裝： 0.300 INCH, PLASTIC, SO-24
文件頁(yè)數(shù)： 16/28頁(yè)
文件大?。?/td> 266K
代理商： LTC4260CSW
LTC4260
16
4260f
The SOA (safe operating area) curves of candidate FETs
must be evaluated to ensure that the heat capacity of the
package can stand 24W for 16ms. The SOA curves of the
Fairchild FDB3632 provide for 1A at 50V (50W) for 10ms,
satisfying the requirement.
The inrush current is set to 1A using C1:
C
C
I
I
mF
A
A
nF
L
GATE UP
INRUSH
1
0 33
.
18
1
5 9
.
=
=
μ
=
(
)
Default values of R5 = 10
and R6 = 100k are chosen as
discussed previously.
The power dissipated in the FET during overcurrent must
be limited. The active current limit uses a timer to prevent
excessive energy dissipation in the FET. The worst-case
power occurs when the voltage versus current profile of
the foldback current limit is at the maximum. This occurs
when the current is 5A and the voltage is 1/2 of the 48V or
24V. See the Current Limit Sense Voltage vs FB Voltage in
the Typical Performance curves to view this profile. In
order to survive 120W, the FET SOA curve dictates the
maximum time at this power level. This particular FET
allows 300W at 1ms or less. Therefore, it is acceptable to
set the current limit timeout using C
T
to be 0.81ms:
C
ms
/
ms F
[
nF
T
=
]
=
0 81
12
68
.
Note the minimum value for C
T
is 0.1nF.
Choose R1, R2, R3, R7 and R8 for the UV, OV and PG
threshold voltages:
V
OVRISING
= 71.2V, V
OVFALLING
= 69.44V (using V
OV(TH)
=
3.5V rising and 3.41V falling)
V
UVRISING
= 43V, V
UVFALLING
= 38.5V, (using V
UV(TH)
=
3.5V rising and 3.12V falling)
V
PGRISING
= 46.14V, V
PGFALLING
= 45V, (using V
FB
= 3.5V
rising and 3.411V falling)
In addition a 0.1
μ
F ceramic bypass capacitor is placed on
the INTV
CC
pin. The complete circuit is shown in Figure 1.
Layout Considerations
To achieve accurate current sensing, a Kelvin connection
is recommended. The minimum trace width for 1oz cop-
per foil is 0.02" per amp to make sure the trace stays at a
reasonable temperature. Using 0.03" per amp or wider is
recommended. Note that 1oz copper exhibits a sheet
resistance of about 530
μ
/ . Small resistances add up
quickly in high current applications. To improve noise
immunity, put the resistive divider to the UV, OV and FB
pins close to the device and keep traces to V
DD
and GND
short. It is also important to put C3, the bypass capacitor
for the INTV
CC
pin, as close as possible between INTV
CC
and GND. A 0.1
μ
F capacitor from the UV pin (and OV pin
through resistor R2) to GND also helps reject supply
noise. Figure 5 shows a layout that addresses these
issues. Note that a surge suppressor, Z1, is placed be-
tween supply and ground using wide traces.
APPLICATIOU
W
U
U
SENSE
LTC4260
V
DD
UV
R1
SENSE RESISTOR R
S
I
LOAD
V
IN
GND
I
LOAD
R2
R3
R
8
C3
4260 F05
C
F
OV
GND
INTV
CC
FB
Z1
Figure 5. Recommended Layout for
R1, R2, R3, R8, C
F
, C3, Z1 and R
S
相關(guān)PDF資料
PDF描述
LTC4260CUH Positive High Voltage Hot Swap Controller with I2C Compatible Monitoring
LTC4260IGN Positive High Voltage Hot Swap Controller with I2C Compatible Monitoring
LTC4260ISW Positive High Voltage Hot Swap Controller with I2C Compatible Monitoring
LTC4260IUH Positive High Voltage Hot Swap Controller with I2C Compatible Monitoring
LTC4300A-1 Hot Swappable 2-Wire Bus Buffers
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4260CSW#PBF 功能描述:IC CTLR HOT SWAP I2C 24-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無(wú) 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁(yè)面:1423 (CN2011-ZH PDF)
LTC4260CSW#TRPBF 功能描述:IC HOT SWAP CNTRL I2C 24-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無(wú) 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁(yè)面:1423 (CN2011-ZH PDF)
LTC4260CUH 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH 80V 32-Pin QFN EP
LTC4260CUH#PBF 功能描述:IC CTLR HOT SWAP I2C 32-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無(wú) 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁(yè)面:1423 (CN2011-ZH PDF)
LTC4260CUH#TRPBF 功能描述:IC HOT SWAP CNTRL I2C 32-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無(wú) 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁(yè)面:1423 (CN2011-ZH PDF)
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