参数资料
| 型号： | LT1931AIS5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG INV 1A TSOT23-5 |
| 标准包装： | 2,500 |
| 类型： | 反相 |
| 输出数： | 1 |
| 输入电压： | 2.45 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2.2MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-5 |
LT1931/LT1931A
APPLICATIO S I FOR ATIO
V OUT
20mV/DIV
AC COUPLED
I L1A + I L1B
0.5A/DIV
AC COUPLED
V OUT
2V/DIV
I IN
0.5A/DIV
AC COUPLED
LOAD 200mA
CURRENT 100mA
100 μ s/DIV
1931 F04
V SHDN 5V
0V
500 μ s/DIV
1931 F06
Figure 4. Transient Response of Inverting Converter
with 220pF Phase Lead Capacitor
V OUT
0.1V/DIV
AC COUPLED
I L1A + I L1B
0.5A/DIV
AC COUPLED
LOAD 200mA
CURRENT 100mA
Figure 6. Start-Up Waveforms for 5V to – 5V Application
(Figure 1). No Soft-Start Circuit. V OUT Reaches – 5V in
500 μ s; Input Current Peaks at 800mA
regulator tries to charge up the output capacitor as quickly
as possible, which results in a large inrush current. Fig-
ure 6 shows a typical oscillograph of the start-up wave-
form for the application of Figure 1 starting into a load of
33 ? . The lower waveform shows SHDN being pulsed
from 0V to 5V. The middle waveform shows the input
50 μ s/DIV
1931 F05
current, which reaches as high as 0.8A. The total time
Figure 5. Transient Response of Inverting Converter with 22 μ F
Tantalum Output Capacitor and No Phase Lead Capacitor
START-UP/SOFT-START
For most LT1931/LT1931A applications, the start-up in-
rush current can be high. This is an inherent feature of
switching regulators in general since the feedback loop is
saturated due to V OUT being far from its final value. The
required for the output to reach its final value is approxi-
mately 500 μ s. For some applications, this initial inrush
current may not be acceptable. If a longer start-up time is
acceptable, a soft-start circuit consisting of R SS and C SS ,
as shown in Figure 7, can be used to limit inrush current
to a lower value. Figure 8 shows the relevant waveforms
with R SS = 15k and C SS = 33nF. Input current, measured
at V IN , is limited to a peak value of 0.5A as the time required
to reach final value increases to 1ms. In Figure 9, C SS is
V IN
CURRENT
PROBE
L1A
10 μ H
C2
1 μ F
L1B
10 μ H
5V
V SS
R SS
15k
+
C1
4.7 μ F
V IN
LT1931
SHDN
GND
SW
NFB
R1
29.4k
R2
C4
220pF
D1
V OUT
–5V
C3
22 μ F
D2
1N4148
10k
C SS
33nF/68nF
V OUT
C1: TAIYO YUDEN X5R JMK212BJ475MG
C2: TAIYO YUDEN X5R LMK212BJ105MG
C3: TAIYO YUDEN XR5 JMK325BJ226MM
1931 F07
D1: ON SEMICONDUCTOR MBR0520
L1: SUMIDA CLS62-100
Figure 7. R SS and C SS at SHDN Pin Provide Soft-Start to LT1931 Inverting Converter
1931fa
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1931ES5 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
| LT1931ES5#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Inv 2.45V to 16V 5-Pin TSOT-23 制造商:Linear Technology 功能描述:IC SEMICONDUCTOR ((NS)) 制造商:Linear Technology 功能描述:IC, DC/DC CONVERTER, 5-TSOT-23; Primary Input Voltage:16V; No. of Outputs:1; Output Voltage:-12V; Output Current:350mA; No. of Pins:5; Operating Temperature Min:-40C; Operating Temperature Max:85C; MSL:MSL 1 - Unlimited ;RoHS Compliant: Yes |
| LT1931ES5#PBF | 制造商:Linear Technology 功能描述:IC |
| LT1931ES5#TR | 功能描述:IC REG INV 1A TSOT23-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LT1931ES5#TRM | 功能描述:IC REG INV 1A TSOT23-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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