參數(shù)資料
型號： LT1613
廠商： Linear Technology Corporation
英文描述： 1.4MHz, Single Cell DC/DC Converter in 5-Lead SOT-23
中文描述： 1.4MHz的，單細胞的DC / DC轉(zhuǎn)換器在5引腳SOT - 23
文件頁數(shù)： 9/12頁
文件大?。?/td> 257K
代理商： LT1613
9
LT1613
START-UP/SOFT-START
When the LT1613 SHDN pin voltage goes high, the device
rapidly increases the switch current until internal current
limit is reached. Input current stays at this level until the
output capacitor is charged to final output voltage. Switch
current can exceed 1A. Figure 16’s oscillograph details
start-up waveforms of Figure 17’s SEPIC into a 50
load
without any soft-start. The output voltage reaches final
value in approximately 200
μ
s, while input current reaches
400mA. Switch current in a SEPIC is 2x the input current,
so the switch is conducting approximately 800mA peak.
Soft-start reduces the inrush current by taking more time
to reach final output voltage. A soft-start circuit consisting
of Q1, R
S1
, R
S2
and C
S1
as shown in Figure 17 can be used
to limit inrush current to a lower value. Figure 18 pictures
V
OUT
and input current with R
S2
of 33k
and C
S
of 10nF.
Input current is limited to a peak value of 200mA as the
OPERATIOU
V
IN
V
OUT
5V
1613 F17
SW
L1
22
μ
H
L2
22
μ
H
C
330pF
D1
GND
LT1613
C1: AVX TAJB226M006
C2: TAIYO YUDEN LMK325BJ106MN
C3: TAIYO YUDEN LMK212BJ105MG
R2
12.1k
R
LOAD
Q1
2N3904
R1
37.4k
R3
10k
R
S1
33k
C3
1
μ
F
FB
V
S
SOFT-START COMPONENTS
C1
22
μ
F
V
IN
4V
C2
10
μ
F
SHDN
+
R
S2
33k
C
S
10nF/
33nF
D1: MOTOROLA MBR0520
L1, L2: MURATA LQH3C220
time required to reach final value increases to 1.7ms. In
Figure 19, C
S
is increased to 33nF. Input current does not
exceed the steady-state current the device uses to supply
power to the 50
load. Start-up time increases to 4.3ms.
C
S
can be increased further for an even slower ramp, if
desired.
V
OUT
2V/DIV
200
μ
s/DIV
1613 F16
Figure 16. Start-Up Waveforms of
Figure 17’s SEPIC Into 50
Load
I
IN
200mA/DIV
V
SHDN
5V/DIV
V
OUT
2V/DIV
500
μ
s/DIV
1613 F18
Figure 18. Soft-Start Components in Figure 17’s SEPIC
Reduces Inrush Current. C
SS
= 10nF, R
LOAD
= 50
I
IN
200mA/DIV
V
S
5V/DIV
V
OUT
2V/DIV
1ms/DIV
1613 F18
Figure 19. Increasing C
S
to 33nF Further
Reduces Inrush Current. R
LOAD
= 50
I
IN
200mA/DIV
V
S
5V/DIV
Figure 17. 5V SEPIC with Soft-Start Components
相關(guān)PDF資料
PDF描述
LT1613CS5 1.4MHz, Single Cell DC/DC Converter in 5-Lead SOT-23
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1613CS5 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 0.9V to 10V 5-Pin TSOT-23
LT1613CS5#PBF 制造商:Linear Technology 功能描述:1 34V 1.1V to 10V TSOT-23-5 制造商:Linear Technology 功能描述:DC/DC 1.1VIN MIN 1.4MHZ 34V 5SOT23 制造商:Linear Technology 功能描述:DC/DC, 1.1VIN MIN, 1.4MHZ, 34V, 5SOT23 制造商:Linear Technology 功能描述:IC, DC/DC CONVERTER, 5-SOT-23; Primary Input Voltage:10V; No. of Outputs:1; Output Voltage:34V; Output Current:200mA; No. of Pins:5; Operating Temperature Min:0C; Operating Temperature Max:70C; MSL:MSL 1 - Unlimited ;RoHS Compliant: Yes
LT1613CS5#PBF 制造商:Linear Technology 功能描述:IC DC/DC CONVERTER 5-SOT-23 制造商:Linear Technology 功能描述:IC, DC/DC CONVERTER, 5-SOT-23
LT1613CS5#TR 功能描述:IC REG BST FLYBACK SEPIC TSOT23 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:500 系列:- 類型:切換式電容器（充電泵），反相 輸出類型:固定 輸出數(shù):1 輸出電壓:-3V 輸入電壓:2.3 V ~ 5.5 V PWM 型:Burst Mode? 頻率 - 開關(guān):900kHz 電流 - 輸出:100mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 細型，TSOT-23-6 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:TSOT-23-6 其它名稱:LTC1983ES6-3#TRMTR
LT1613-CS5#TR 制造商:Linear Technology 功能描述:
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