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| 型号： | DEMOBOARD TLE 6368 |
| 厂商： | Infineon Technologies |
| 文件页数： | 53/59页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO FOR TLE 6368 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，LDO 步降 |
| 输入电压： | 5.5 ~ 60 V |
| 稳压器拓扑结构： | 降压 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | TLE6368 |
| 相关产品： | TLE6368R-ND - IC PS SYSTEM MULTI VOLT PDSO-36 TLE6368G1-ND - IC PS SYSTEM MULTI VOLT PDSO-36 |
| 其它名称： | DEMOBOARDTLE6368IN |
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TLE 6368 / SONIC
5.2.5
Bootstrap capacitor (C BTP )
The voltage at the Bootstrap capacitor does not exceed 15V, a ceramic type with a
minimum of 2% of the buck output capacitance and voltage class 16V would be
sufficient.
5.2.6
External charge pump capacitors (C FLY , C CCP )
Out of the feedback voltage the charge pump generates a voltage between 8 and 10V.
The fly capacitor connected between C+ and C- is charged with the feedback voltage
level and discharged to achieve the (almost) double voltage level at CCP. C FLY is chosen
to 100nF and C CCP to 220nF, both ceramic types.
The connection of CCP to a voltage source of e.g. 7V (take care of the maximum
ratings!) via a diode improves the start-up behavior at very low battery voltage. The diode
with the cathode on CCP has to be used in order to avoid any influence of the voltage
source to the device’s operation and vice versa.
5.2.7
Input filter components for reduced EME (C I1 , C I2 , C I3 , L I , R Slew )
At the input of Buck converters a square wave current is observed causing
electromagnetical interference on the battery line. The emission to the battery line
consists on one hand of components of the switching frequency (fundamental wave) and
its harmonics and on the other hand of the high frequency components derived from the
current slope. For proper attenuation of those interferers a π -type input filter structure is
recommended which is built up with inductive (L I ) and capacitive components (C I1 , C I2 ,
C I3 ). The inductance can be chosen up to the value of the Buck converter inductance,
higher values might not be necessary, C I1 and C I3 should be ceramic types and for C I2 an
input capacitance with very low ESR should be chosen and placed as close to the input
of the Buck converter as possible.
Inexpensive input filters show due to their parasitics a notch filter characteristic, which
means basically that the lowpass filter acts from a certain frequency as a highpass filter
and means further that the high frequency components are not attenuated properly. For
that reason the TLE 6368 G1 / SONIC offers the possibility of current slope adjustment.
The current transition time can be set by the external resistor (located on the SLEW pin)
to times between 20ns and 80ns by varying the resistor value between 0 ? (fastest
transition) and 20k ? (slowest transition).
5.2.8
Feedback circuit for minimum switching loss (R Boost , C Boost , D Boost )
To decrease the switching losses to a minimum the external components R Boost , C Boost
and D Boost are needed. The current though the feedback resistor R Boost is about a few mA
where the Diode D Boost and the capacitor C Boost run a part of the load current.
If this feature is not needed the three components are not needed and the Boost pin (33)
can be connected directly to the IN pins(32, 30).
Data Sheet
53
Rev. 2.2, 2006-12-01
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