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參數(shù)資料
| 型號： | LT1316CS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Micropower DC/DC Converter with Programmable Peak Current Limit |
| 中文描述： | 0.75 A SWITCHING REGULATOR, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SOP-8 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大小： | 344K |
| 代理商： | LT1316CS8 |
7
LT1316
APPLICATIO
S I
N
FOR
ATIO
U
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 +
V
IN
/L(turn-off delay)
W
U
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:
DC =
V
OUT
– V
IN
+ V
D
V
OUT
– V
SAT
+ V
D
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
duty cycle of 0.73, the converter cannot operate in con-
tinuous conduction mode and must be designed for
discontinuous mode operation.
Inductor Selection and Peak Current Limit for
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:
I
PEAK
=2(I
OUT
)
1 – DC
(1)
Inductance can now be calculated using the peak current:
L =
(t
OFF
)
V
OUT
– V
IN
+ V
D
0.4(I
PEAK
)
(2)
where t
OFF
= 2
μ
s and V
D
= 0.4V.
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.
Figure 5. Minimum Inductance vs Peak Current
for Continuous Mode Operation
PEAK CURRENT (mA)
10
10
M
C
μ
H
100
1000
100
1000
1316 F05
5V TO 18V
5V TO 12V
2V TO 5V
2
μ
s/DIV
Figure 4. Discontinuous Mode Operation
1316 F04
SW PIN
5V/DIV
0mA
INDUCTOR
CURRENT
100mA/DIV
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相關(guān)代理商/技術(shù)參數(shù) |
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| LT1316CS8#PBF | 功能描述:IC REG BST FLYBK ADJ 0.5A 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LT1316CS8#TR | 功能描述:IC REG BST FLYBK ADJ 0.5A 8SOIC 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(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 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:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LT1316CS8#TRPBF | 功能描述:IC REG BST FLYBK ADJ 0.5A 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 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:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LT1316CS8PBF | 制造商:Linear Technology 功能描述:LT1316CS8PBF |
| LT1316IS8 | 功能描述:IC REG BST FLYBK ADJ 0.5A 8SOIC 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(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 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:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
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