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| 型号： | LTC1624CS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST FLYBK INV 8SOIC |
| 标准包装： | 100 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 225kHz |
| 占空比： | 95% |
| 电源电压： | 3.5 V ~ 36 V |
| 降压： | 是 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 是 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1333 (CN2011-ZH PDF) |
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LTC1624
APPLICATIO N S I N FOR M ATIO N
10 μ H inductance is obtained with a current rating of 4A.
Splitting the two windings creates two 10 μ H inductors
with a current rating of 2A each. Therefore substitute
(2)(10 μ H) = 20 μ H for L in the equations.
Specify the maximum inductor current to safely handle
I L(PEAK) . Make sure the inductor’s saturation current rat-
ing (current when inductance begins to fall) exceeds the
output ripple voltage. The input capacitor needs to be sized
to handle the ripple current safely.
Since the output capacitor’s ESR affects efficiency, use
low ESR capacitors for best performance. SEPIC regula-
tors, like step-down regulators, have a triangular current
waveform but have maximum ripple at V IN(MAX) . The input
capacitor ripple current is:
( )
maximum current rating set by R SENSE .
SEPIC Converter: R SENSE Selection for Maximum
Output Current
I RIPPLE RMS =
? I L
12
( )
R SENSE is chosen based on the required output current.
Remember the LTC1624 current comparator has a maxi-
mum threshold of 160mV/R SENSE . The current compara-
tor threshold sets the peak of the inductor current, yielding
a maximum average output current I OUT(MAX) equal to
I L1(PEAK) less half the peak-to-peak ripple current, ? I L ,
divided by the output-input voltage ratio (see equation for
I L1(PEAK) ) .
Allowing a margin for variations in the LTC1624 (without
considering variation in R SENSE ), assuming 30% ripple
current in the inductor, yields:
The output capacitor ripple current is:
I RIPPLE RMS = I OUT V OUT
V IN
The output capacitor ripple voltage (RMS) is:
V OUT(RIPPLE) = 2( ? I L )(ESR)
The input capacitor can see a very high surge current when
a battery is suddenly connected, and solid tantalum
capacitors can fail under this condition. Be sure to specify
surge tested capacitors.
( )
( )
I OUT MAX ? V OUT + V D ?
R SENSE =
100 mV ? V IN MIN ?
? ?
? ?
SEPIC Converter: Coupling Capacitor (C1)
The coupling capacitor C1 in Figure 7 sees a nearly
rectangular current waveform. During the off-time the
current through C1 is I OUT (V OUT /V IN ) while approximately
+ V
(
)
( )
I D 1 PEAK OUT MAX ?
+ 1 ? + ? I L
= I
( )
? V IN MIN ?
? ?
?
?
? V C 1 = ?
? ?
(
)( )
SEPIC Converter: Output Diode
The output diode conducts current only during the switch
off-time. Peak reverse voltage for SEPIC converters is
equal to V OUT + V IN . Average forward current in normal
operation is equal to output current. Peak current is:
? ?
V OUT D
? ?
Schottky diodes such as MBR130LT3 are recommended.
– I OUT flows though C1 during the on-time. This current
waveform creates a triangular ripple voltage on C1:
I OUT V OUT
? ? ?
? 200 kHz C 1 ? ? V IN + V OUT + V D ?
The maximum voltage on C1 is then:
V C1(MAX) = V IN + ? V C1 /2 (typically close to V IN(MAX) ).
The ripple current though C1 is:
( )
SEPIC Converter: Input and Output Capacitors
The output capacitor is normally chosen by its effective
I RIPPLE C 1 = I OUT
V OUT
V IN
series resistance (ESR), because this is what determines
The maximum ripple current occurs at I OUT(MAX) and
V IN(MIN) . The capacitance of C1 should be large enough so
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1624IS8 | 功能描述:IC REG CTRLR BST FLYBK INV 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC1624IS8#PBF | 功能描述:IC REG CTRLR BST FLYBK INV 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC1624IS8#PBF | 制造商:Linear Technology 功能描述:DC/DC Converter IC |
| LTC1624IS8#TR | 功能描述:IC REG CTRLR BST FLYBK INV 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC1624IS8#TRPBF | 功能描述:IC REG CTRLR BST FLYBK INV 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
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