参数资料
| 型号： | LT1613CS5#TRM |
| 厂商： | Linear Technology |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BST FLYBACK SEPIC TSOT23 |
| 标准包装： | 1 |
| 类型： | 升压（升压），回扫，Sepic |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.23 V ~ 36 V |
| 输入电压： | 1.1 V ~ 10 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.4MHz |
| 电流 - 输出： | 300mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 包装： | 剪切带 (CT) |
| 供应商设备封装： | TSOT-23-5 |
| 其它名称： | LT1613CS5 LT1613CS5#TRMCT LT1613CS5-ND |
LT1613
OPERATIO
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
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
I IN
200mA/DIV
V S
of Q1, R S1 , R S2 and C S1 as shown in Figure 17 can be used
5V/DIV
500 μ s/DIV
1613 F18
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
V OUT
2V/DIV
I IN
200mA/DIV
V SHDN
Figure 18. Soft-Start Components in Figure 17’s SEPIC
Reduces Inrush Current. C SS = 10nF, R LOAD = 50 ?
V OUT
2V/DIV
I IN
200mA/DIV
V S
5V/DIV
200 μ s/DIV
1613 F16
5V/DIV
1ms/DIV
1613 F18
Figure 16. Start-Up Waveforms of
Figure 17’s SEPIC Into 50 ? Load
Figure 19. Increasing C S to 33nF Further
Reduces Inrush Current. R LOAD = 50 ?
V IN
L1
22 μ H
C3
1 μ F
4V
SOFT-START COMPONENTS
C1
22 μ F
+
V IN
SW
L2
22 μ H
C PL
330pF
D1
R S1
LT1613
R3
V S
C S
10nF/
33nF
33k
R S2
33k
Q1
2N3904
SHDN
GND
FB
10k
R2
12.1k
R1
37.4k
C2
10 μ F
R LOAD
V OUT
5V
1613 F17
C1: AVX TAJB226M006
C2: TAIYO YUDEN LMK325BJ106MN
D1: MOTOROLA MBR0520
L1, L2: MURATA LQH3C220
C3: TAIYO YUDEN LMK212BJ105MG
Figure 17. 5V SEPIC with Soft-Start Components
9
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