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參數(shù)資料
| 型號(hào)： | LTC1709EG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | CHOKE COIL 6.8UH 620MA SMD |
| 中文描述： | 3 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO36 |
| 封裝： | 0.209 INCH, PLASTIC, SSOP-36 |
| 文件頁(yè)數(shù)： | 24/28頁(yè) |
| 文件大?。?/td> | 319K |
| 代理商： | LTC1709EG |
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24
LTC1709-7
APPLICATIU
A 1.5
μ
H inductor will produce 27% ripple current. The
peak inductor current will be the maximum DC value plus
one half the ripple current, or 11.5A. The minimum on-
time occurs at maximum V
IN
:
W
U
U
t
V
V f
V
V
kHz
s
ON MIN
OUT
)
=
=
(
)(
)
=
μ
1 8
.
5 5
.
300
1 1
.
The R
SENSE
resistors value can be calculated by using the
maximum current sense voltage specification with some
accomodation for tolerances:
R
mV
.
A
SENSE
=
≈
50
11 5
0 004
.
The power dissipation on the topside MOSFET can be
easily estimated. Using a Siliconix Si4420DY for example;
R
DS(ON)
= 0.013
, C
RSS
= 300pF. At maximum input
voltage with T
J
(estimated) = 110
°
C at an elevated ambient
temperature:
P
V
V
C
C
V
A
pF
kHz
W
MAIN
=
( )
+
(
(
0 65
.
)
°
)(
°
(
)
[
]
+
)
=
) (
)
(
1 8
5 5
.
10
1
0 005 110
.
25
0.
1 7 5 5
.
10
300
300
2
2
.
.
The worst-case power disipated by the synchronous
MOSFET under normal operating conditions at elevated
ambient temperature and estimated 50
°
C junction tem-
perature rise is:
P
V
5 5
.
V
V
A
W
SYNC
=
(
) (
)
(
)
=
5 5
.
1 8
.
10
1 48 0 013
.
1 29
.
2
.
A short-circuit to ground will result in a folded back current
of about:
I
mV
ns
V
H
A
SC
=
+
(
μ
)
25
0 004
.
1
2
200
5 5
.
1 5
.
7
The worst-case power disipated by the synchronous
MOSFET under short-circuit conditions at elevated ambi-
ent temperature and estimated 50
°
C junction temperature
rise is:
P
V
5 5
.
V
V
A
mW
SYNC
=
( ) (
)
(
)
=
5 5
.
1 8
.
7
1 48 0 013
.
630
2
.
which is less than normal, full-load conditions. Inciden-
tally, since the load no longer dissipates power in the
shorted condition, total system power dissipation is de-
creased by over 99%.
The duty factor for this application is:
DF
V
V
V
V
O
IN
=
=
=
1 8
5
0 36
.
.
Using Figure 4, the RMS ripple current will be:
I
INRMS
= (20A)(0.23) = 4.6A
RMS
An input capacitor(s) with a 4.6A
RMS
ripple current rating
is required.
The output capacitor ripple current is calculated by using
the inductor ripple already calculated for each inductor
and multiplying by the factor obtained from Figure3
along with the calculated duty factor. The output ripple in
con
tinuous mode will be highest at the maximum input
voltage since the duty factor is <50%. The maximum
output current ripple is:
I
V
fL
at
DF
I
V
(
kHz
H
A
m
V
A
mV
COUT
OUT
COUTMAX
RMS
OUTRIPPLE
RMS
RMS
=
( )
=
(
=
=
)
μ
)
)
=
0 3
.
33
1.
300
1 5
.
0 3
.
1 2
20
1 2
.
24
%
.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1709EG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC1709EG#TR | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1709EG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC1709EG7 | 制造商:Linear Technology 功能描述: |
| LTC1709EG-7 | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無(wú) 升壓:是 回掃:是 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
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