參數(shù)資料
型號： TPS62690YFFR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 0.5 A SWITCHING REGULATOR, 4400 kHz SWITCHING FREQ-MAX, BGA6
封裝： GREEN, DSBGA-6
文件頁數(shù)： 11/27頁
文件大小： 870K
代理商： TPS62690YFFR
DIL +
V
O
V
I
V
I *
V
O
L
sw
DIL(MAX) + IO(MAX) )
DIL
2
SLVS965
– MARCH 2011
APPLICATION INFORMATION
INDUCTOR SELECTION
The TPS6269x series of step-down converters have been optimized to operate with an effective inductance
value in the range of 0.5
μH to 1.8μH and with output capacitors in the range of 4.7μF to 10μF. The internal
compensation is optimized to operate with an output filter of L = 1
μH and CO = 4.7μF. Larger or smaller inductor
values can be used to optimize the performance of the device for specific operation conditions. For more details,
see the CHECKING LOOP STABILITY section.
The inductor value affects its peak-to-peak ripple current, the PWM-to-PFM transition point, the output voltage
ripple and the efficiency. The selected inductor has to be rated for its dc resistance and saturation current. The
inductor ripple current (
ΔIL) decreases with higher inductance and increases with higher VI or VO.
with: fSW = switching frequency (4 MHz typical)
L = inductor value
ΔIL = peak-to-peak inductor ripple current
IL(MAX) = maximum inductor current
(2)
In high-frequency converter applications, the efficiency is essentially affected by the inductor AC resistance (i.e.
quality factor) and to a smaller extent by the inductor DCR value. To achieve high efficiency operation, care
should be taken in selecting inductors featuring a quality factor above 25 at the switching frequency. Increasing
the inductor value produces lower RMS currents, but degrades transient response. For a given physical inductor
size, increased inductance usually results in an inductor with lower saturation current.
The total losses of the coil consist of both the losses in the DC resistance (DC)) and the following
frequency-dependent components:
The losses in the core material (magnetic hysteresis loss, especially at high switching frequencies)
Additional losses in the conductor from the skin effect (current displacement at high frequencies)
Magnetic field losses of the neighboring windings (proximity effect)
Radiation losses
The following inductor series from different suppliers have been used with the TPS6269x converters.
Table 1. List of Inductors
MANUFACTURER
SERIES
DIMENSIONS (in mm)
LQM21PN1R0NGC
2.0 x 1.2 x 1.0 max. height
MURATA
LQM21PN1R5MC0
2.0 x 1.2 x 0.55 max. height
FDK
MIPS2012D1R0-X2
2.0 x 1.2 x 1.0 max. height
TAIYO YUDEN
NM2012N1R0M
2.0 x 1.2 x 1.0 max. height
TOKO
MDT2012-CH1R0A
2.0 x 1.2 x 1.0 max. height
2011, Texas Instruments Incorporated
19
Product Folder Link(s) :TPS62690 TPS62691
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS62690YFFT 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 500mA,4MHz,2.85Vout Hi-Eff St-Dwn Cnvrtr RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
TPS62691EVM-076 功能描述:電源管理IC開發(fā)工具 TPS62691 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS62692EVM-076 制造商:Texas Instruments 功能描述:TPS62692EVM-076 EVALUATION MODULE
TPS62692YFDR 制造商:Texas Instruments 功能描述:
TPS62693YFDR 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 800-mA 3-MHz Hi-Eff SD Cnvtr RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
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