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| 型号： | LT1871IMS-7 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | PLASTIC, MSOP-10 |
| 文件页数： | 17/32页 |
| 文件大小： | 461K |
| 代理商： | LT1871IMS-7 |
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LTC1871-7
24
18717fc
APPLICATIONS INFORMATION
9. For applications with multiple switching power convert-
ers connected to the same input supply, make sure that
the input lter capacitor for the LTC1871-7 is not shared
with other converters. AC input current from another
converter could cause substantial input voltage ripple, and
this could interfere with the operation of the LTC1871-7.
A few inches of PC trace or wire (L ≈ 100nH) between the
CIN of the LTC1871-7 and the actual source VIN should be
sufcient to prevent current sharing problems.
SEPIC Converter Applications
The LTC1871-7 is also well suited to SEPIC (single-ended
primary inductance converter) converter applications. The
SEPIC converter shown in Figure 20 uses two inductors.
The advantage of the SEPIC converter is the input voltage
may be higher or lower than the output voltage, and the
output is short-circuit protected.
The rst inductor, L1, together with the main switch,
resembles a boost converter. The second inductor, L2,
together with the output diode D1, resembles a yback or
buck-boost converter. The two inductors L1 and L2 can be
independent but can also be wound on the same core since
identical voltages are applied to L1 and L2 throughout the
switching cycle. By making L1 = L2 and winding them on
the same core the input ripple is reduced along with cost
and size. All of the SEPIC applications information that
follows assumes L1 = L2 = L.
SEPIC Converter: Duty Cycle Considerations
For a SEPIC converter operating in a continuous conduction
mode (CCM), the duty cycle of the main switch is:
D=
VO + VD
VIN + VO + VD
where VD is the forward voltage of the diode. For convert-
ers where the input voltage is close to the output voltage
the duty cycle is near 50%.
Figure 20. SEPIC Topolgy and Current Flow
Figure 21. SEPIC Converter Switching Waveforms
+
SW
L2
COUT
RL
VOUT
VIN
C1
D1
L1
20a. SEPIC Topology
+
RL
VOUT
18717 F20
VIN
D1
20c. Current Flow During Switch Off-Time
+
RL
VOUT
VIN
20b. Current Flow During Switch On-Time
21a. Input Inductor Current
IIN
IL1
SW
ON
SW
OFF
21b. Output Inductor Current
IO
IL2
21c. DC Coupling Capacitor Current
IO
IIN
IC1
21e. Output Ripple Voltage
VOUT
(AC)
ΔVESR
RINGING DUE TO
TOTAL INDUCTANCE
(BOARD + CAP)
ΔVCOUT
21d. Diode Current
IO
18717 F21
ID1
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PDF描述 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1871IMS-7-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Input Voltage,Current Mode Boost, Flyback and SEPIC Controller |
| LT1871IMS-7-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Input Voltage,Current Mode Boost, Flyback and SEPIC Controller |
| LT1871IMS-7-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Input Voltage,Current Mode Boost, Flyback and SEPIC Controller |
| LT1873-41 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Optoelectronic |
| LT1873-41UR | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Optoelectronic |
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