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| 型号： | LT1316CS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BST FLYBK ADJ 0.5A 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 升压，反激式 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.23 V ~ 30 V |
| 输入电压： | 1.5 V ~ 12 V |
| 电流 - 输出： | 500mA |
| 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
LT1316
APPLICATIO N S I N FOR M ATIO N
V OUT – V IN + V D
then adding in the amount of overshoot that will occur due
to turn-off delay of the power transistor. This turn-off
delay is approximately 300ns.
Peak switch current = DC current limit from graph +
L= (t OFF )
0.4(I PEAK )
where t OFF = 2 μ s and V D = 0.4V.
(2)
V IN /L(turn-off delay)
Example:
Set peak switch current to 100mA for: V IN = 2V,
L = 33 μ H
Overshoot = V IN /L(turn-off delay) = (2/33 μ H)(300ns)
= 18.2mA
Refer to R SET graph and locate
(100mA – 18.2mA) ≈ 82mA
R SET ≈ 33k
Calculating Duty Cycle
For a boost converter running in continuous conduction
mode, duty cycle is constrained by V IN and V OUT according
to the equation:
As a result of equations 1 and 2, ripple current during
switching will be 40% of the peak current (see Figure 2).
Using these equations at the specified I OUT , the part is
delivering approximately 60% of its maximum output
power. In other words, the part is operating on a 40%
reserve. This is a safe margin to use and can be decreased
if input voltage and output current are tightly controlled.
For some applications, this recommended inductor size
may be too large. Inductance can be reduced but available
output power will decrease. Also, ripple current during
switching will increase and may cause discontinuous
operation. Discontinuous operation occurs when
inductor current ramps down to zero at the end of each
switch cycle (see Figure 4). Shown in Figure 5 is minimum
inductance vs peak current for the part to remain in
continuous mode.
DC =
V OUT – V IN + V D
V OUT – V SAT + V D
0mA
INDUCTOR
CURRENT
100mA/DIV
where V D = diode voltage drop ≈ 0.4V and V SAT = switch
saturation voltage ≈ 0.2V.
If the duty cycle exceeds the LT1316’s minimum specified
SW PIN
5V/DIV
duty cycle of 0.73, the converter cannot operate in con-
tinuous conduction mode and must be designed for
2 μ s/DIV
1316 F04
discontinuous mode operation.
Inductor Selection and Peak Current Limit for
Figure 4. Discontinuous Mode Operation
1000
Continuous Conduction Mode
Peak current and inductance determine available output
power. Both must be chosen properly. If peak current or
inductance is increased, output power increases. Once
output power or current and duty cycle are known, peak
current can be set by the following equation, assuming
continuous mode operation:
100
5V TO 12V
2V TO 5V
5V TO 18V
I PEAK =
2(I OUT )
1 – DC
(1)
10
10
100
PEAK CURRENT (mA)
1000
1316 F05
Inductance can now be calculated using the peak current:
Figure 5. Minimum Inductance vs Peak Current
for Continuous Mode Operation
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1316IS8 | 功能描述:IC REG BST FLYBK ADJ 0.5A 8SOIC 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 |
| LT1316IS8#PBF | 功能描述:IC REG BST FLYBK ADJ 0.5A 8SOIC RoHS:是 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 |
| LT1316IS8#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BOOST, 500mA, SOIC-8 |
| LT1316IS8#TR | 功能描述:IC REG BST FLYBK ADJ 0.5A 8SOIC 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 |
| LT1316IS8#TRPBF | 功能描述:IC REG BST FLYBK ADJ 0.5A 8SOIC RoHS:是 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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