 English |
|
|
|
|
|
|
|
| TLE8386-2EL Datasheet, PDF (21/32 Pages) Infineon Technologies AG – Basic Smart Boost Controller | |||
| |||
| ◁ |
TLE8386-2EL
Application Information
10.1.1 Principle:
The TLE8386-2EL can be configured as a boost converter, where the desired output voltage VBO is always higher
than the input voltage VIN. A boost convertor is not short-circuit protected. If the output voltage VBO is shorted, the
output current will only be limited by the input voltage VIN capability.
A typical boost converter application is shown in Figure 8, the elements and abbreviations and their meanings are:
⢠LBOOST = boost inductor
⢠LINPUT = input filter inductor, recommended to reduce electromagnetic emissions
⢠CIN1 = input filter capacitor
⢠CIN2 = additional input filter capacitor, recommended to reduce electromagnetic emissions
⢠COUT = output filter capacitor
⢠DBOOST = output diode
⢠VIN = input voltage
⢠VINMIN = minimum input voltage
⢠VBO = boost output voltage
⢠RCS = current sense resistor
⢠RFBH = boost output voltage resistor divider, highside resistor
⢠RFBL = boost output voltage resistor divider, lowside resistor
⢠RCOMP, CCOMP = compensation network elements
⢠RFREQ = frequency setting resistor
⢠CSST = softstart setting capacitor
⢠CIVCC = capacitor for internal LDO
⢠D = duty cycle
⢠DMAX = maximum duty cycle
⢠fFREQ = Switching Frequency
⢠IIN = input current
⢠IBO = output current
⢠IBOMAX = maximum output current
The ratio between input voltage VIN and output voltage VBO in continuos conduction mode (CCM) is:
V-----B---O--
VIN
=
------1------
1âD
â
D
=
V-----B---O-----â-----V----I--N--
VBO
In discontinous conduction mode (DCM) the conversion ratio at a fixed frequency is higher, the switching current
increases and efficiency is reduced. The maximum duty cycle DMAX occurs for minimum input voltage VINMIN.
Data Sheet
19
Rev. 1.0, 2010-10-25
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese