- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377763 > LTC1735IS (LINEAR TECHNOLOGY CORP) RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS PDF資料下載
參數(shù)資料
| 型號： | LTC1735IS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 3 A SWITCHING CONTROLLER, 335 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SO-16 |
| 文件頁數(shù)： | 23/32頁 |
| 文件大?。?/td> | 373K |
| 代理商： | LTC1735IS |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁當(dāng)前第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁
23
LTC1735
At full load current:
V
A
A
V A
/
V
V
ITH MAX
(
P P
2
)
0 084
.
.
=
+
1 77
+
=
15
5
0 3
At minimum load current:
V
A
A
V A
/
V
V
ITH MIN
(
P P
2
)
.
0 084
.
.
=
+
0 40
+
=
0 2
2
0 3
In this circuit, V
ITH
changes from 0.40V at light load to
1.77V at full load, a 1.37V change. Notice that
I
L
, the
peak-to-peak inductor current, changes from light load to
full load. Increasing the DC inductor current decreases the
permeability of the inductor core material, which de-
creases the inductance and increases
I
L
. The amount of
inductance change is a function of the inductor design.
To create the
±
30mV input offset, the gain of the error
amplifier must be limited. The desired gain is:
A
V
InputOffsetError
Connecting a resistor to the output of the transconductance
error amplifier will limit the voltage gain. The value of this
resistor is:
A
Error Amplifier g
m
V
V
V
ITH
=
=
=
1 37
2 0 03
( .
22 8
.
)
.
R
ms
k
ITH
V
=
=
=
22 8
1 3
.
17 54
.
.
To center the output voltage variation, V
ITH
must be
centered so that no I
TH
pin current flows when the output
voltage is nominal. V
ITH(NOM)
is the average voltage be-
tween V
ITH
at maximum output current and minimum
output current:
V
V
V
V
V
V
V
V
ITH NOM
(
ITH MAX
(
ITH MIN
(
ITH MIN
(
)
)
)
)
–
2
.
–0 40
2
.
.
=
+
=
+
=
1 77
0 40
1 085
APPLICATIU
W
U
U
The Thevenin equivalent of the gain limiting resistance
value of 17.54k is made up of a resistor R4 that sources
current into the I
TH
pin and resistor R1 that sinks current
to SGND.
To calculate the resistor values, first determine the ratio
between them:
k
V
V
V
V
1 085
V
V
INTVCC
ITH NOM
(
ITH NOM
(
=
=
=
–
.
–1 085
.
.
)
)
5 2
3 79
V
INTVCC
is equal to V
EXTVCC
or 5.2V if EXTV
CC
is not used.
Resistor R4 is:
R
k
R
k
ITH
4
1
(3 79 1 17 54
84 0
=
+
=
=
(
)
)
.
.
Resistor R1 is:
R
k
R
k
k
k
ITH
1
1
3 79
.
22 17
.
=
+
=
=
(
)
(3 79 1 17 54
)
.
Unfortunately, PCB noise can add to the voltage developed
across the sense resistor, R5, causing the I
TH
pin voltage
to be slightly higher than calculated for a given output
current. The amount of noise is proportional to the output
current level. This PCB noise does not present a serious
problem but it does change the effective value of R5 so the
calculated values of R1 and R4 may need to be adjusted to
achieve the required results. Since PCB noise is a function
of the layout, it will be the same on all boards with the same
layout.
Figures 9 and 10 show the transient response before and
after active voltage positioning is implemented. Notice
that active voltage positioning reduced the transient re-
sponse from almost 200mV
P-P
to a little over 100mV
P-P
.
Refer to Design Solutions 10 for more information about
active voltage positioning.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1735C-1 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC1735CS-1 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC1735IS-1 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC1735-1 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC1735C | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1735IS#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| LTC1735IS#TR | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC 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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC1735IS#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC 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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC1735IS-1 | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC 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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC1735IS-1#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC 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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。