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參數(shù)資料
| 型號： | LTC4214-1IMS#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 18/32頁 |
| 文件大?。?/td> | 277K |
| 描述： | IC CTRLR HOTSWAP NEGVOLT 10MSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 熱交換控制器 |
| 應(yīng)用： | 通用 |
| 內(nèi)部開關(guān)： | 無 |
| 電源電壓： | 6 V ~ 16 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-MSOP |
| 包裝： | 帶卷 (TR) |
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LTC4214-1/LTC4214-2
18
421412f
for C
T
is calculated based on the maximum time it takes the
load capacitor to charge. That time is given by:
t
C V
I
C V
I
CL CHARGE
L SUPPLY MAX
INRUSH MIN
(
)
( )
( )
"
"
=
=
(11)
The maximum current flowing in the DRAIN pin is given
by:
I
V
V
R
DRN MAX
SUPPLY MAX
DRNCL
D
( )
( )
=
(12)
Approximating a linear charging rate as I
DRN
drops from
I
DRN(MAX)
to zero, the I
DRN
component in Equation (3) can
be approximated with 0.5 " I
DRN(MAX)
. Rearranging equa-
tion, TIMER capacitor C
T
is given by:
C
t
A
I
V
T
CL CHARGE
DRN MAX
=
?nbsp +
(
)
(
)
(
)
"
"
40
4
3
(13)
Returning to Equation (3), the TIMER period is calculated
and used in conjunction with V
SUPPLY(MAX)
and
I
SHORTCIRCUIT(MAX)
to check the SOA curves of a prospec-
tive MOSFET.
As a numerical design example, consider a 10W load,
which requires 1.1A input current at 10.8V. If
V
SUPPLY(MAX)
= 13.2V and C
L
= 100礔, R
D
= 475k, Equa-
tion (8) gives R
S
= 40m&; Equation (13) gives C
T
= 34nF.
To account for errors in R
S
, C
T
, TIMER current (40礎(chǔ)),
TIMER threshold (3V), R
D
, DRAIN current multiplier and
DRAIN voltage clamp (V
DRNCL
), the calculated value should
be multiplied by 1.5, giving the nearest standard value of
C
T
= 56nF.
If a short-circuit occurs, a current of up to 80mV/
40m& = 2A will flow in the MOSFET for 0.9ms as dictated
by C
T
= 56nF in Equation (3). The MOSFET must be
selected based on this criterion. The IRF7413 can handle
20V and 2A for 9ms and is safe to use in this application.
Computing the maximum soft-start capacitor value during
soft-start to a load short is complicated by the nonlinear
MOSFETs SOA characteristics and the R
SS
C
SS
response.
An overly conservative but simple approach begins with
the maximum circuit breaker current, given by:
I
mV
R
CB MAX
S
(
)
=
56
(14)
From the SOA curves of a prospective MOSFET, determine
the time allowed, t
SOA(MAX)
. C
SS
is given by:
C
t
R
SS
SOA MAX
SS
=
(
)
. "
1 61
(15)
In the above example, 56mV/40m& gives 1.4A. t
SOA(MAX)
for the IRF7413 is 8ms for 1.4A at 30V. From Equation
(15), C
SS
= 68nF. Actual board evaluation showed that
C
SS
= 33nF was appropriate. The ratio (R
SS
" C
SS
) to
t
CL(CHARGE)
is a good gauge as a large ratio may result in
the time-out period expiring. This gauge is determined
empirically with board level evaluation.
SUMMARY OF DESIGN FLOW
To summarize the design flow, consider the application
shown in Figure 2. It was designed for 12W for a 10V to
14V supply.
Calculate the maximum load current: 12W/10V = 1.2A;
allowing for 75% converter efficiency, I
IN(MAX)
= 1.6A.
Calculate R
S
: from Equation (8) R
S
= 25m&.
Calculate I
SHORTCIRCUIT(MAX)
: from Equation (10)
I
SHORTCIRCUIT(MAX)
= 3.2A.
Select a MOSFET that can handle 3.2A at 14V: IRF7413.
Calculate C
T
: from Equation (13) C
T
= 24nF. Select
C
T
= 47nF, which gives the circuit breaker time-out period
t
MAX
= 0.7ms.
Consult MOSFET SOA curves: the IRF7413 can handle
3.2A at 20V for 3.5ms, so it is safe to use in this
application.
Calculate C
SS
: using Equations (14) and (15) select
C
SS
= 22nF.
FREQUENCY COMPENSATION
The LTC4214 typical frequency compensation network for
the analog current limit loop is a series R
C
(10&) and C
C
connected to V
EE
. Figure 6 depicts the relationship be-
APPLICATIO S I FOR ATIO
U
U
U
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| LTC4214-2CMS | 功能描述:IC CTRLR HOTSWAP NEGVOLT 10MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| LTC4214-2CMS#PBF | 功能描述:IC CTRLR HOTSWAP NEGVOLT 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| LTC4214-2CMS#TR | 功能描述:IC CONTROLLER HOTSWAP NEG 10MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| LTC4214-2CMS#TRPBF | 功能描述:IC CTRLR HOTSWAP NEGVOLT 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 類型:熱插拔開關(guān) 應(yīng)用:通用 內(nèi)部開關(guān):是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件 |
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