- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄365580 > SLUA110 (Texas Instruments, Inc.) PRACTICAL CONSIDERATIONS IN CURRENT MODE POWER SUPPLIES PDF資料下載
參數(shù)資料
| 型號(hào)： | SLUA110 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | PRACTICAL CONSIDERATIONS IN CURRENT MODE POWER SUPPLIES |
| 中文描述： | 實(shí)用的思考模式電源電流 |
| 文件頁(yè)數(shù)： | 2/19頁(yè) |
| 文件大?。?/td> | 787K |
| 代理商： | SLUA110 |
第1頁(yè)當(dāng)前第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)
APPLICATION NOTE
U-111
Parameters Required for
Slope Compensation Calculations
Slope compensation can be calculated after specific
parameters of the circuit are defined and calculated.
SECTION
PARAMETER
Control
T on (Max) Oscillator
Oscillator (PK-PK Ramp Amplitude)
I Sense Threshold (Max)
Output
V Secondary (Min)
L output
I AC Secondary
(Secondary Ripple Current)
General
R Sense (Current Sensing Resistor)
M (Amount of Slope Compensation)
N Turns Ratio
Once obtained, the calculations for slope compensation
are straightforward, using the following equations and
diagrams.
/
Figure 3. General Circuit
Resistors R1 and R2 form a voltage divider from the oscilla-
tor output to the current limit input, superimposing the
slope compensation on the primary current waveform.
Capacitor C1 is an AC coupling capacitor, and allows the
AC voltage swing of the oscillator to be used without add-
ing offset circuitry. Capacitor C2 forms an R-C filter with R1
to suppress the leading edge glitch of the primary current
wave. The ratio of resistor R2 to R1 will determine the exact
amount of slope compensation added.
For purposes of determining the resistor values, capacitors
(timing),
(coupling), and C2 (filtering) can be
removed from the circuit schematic. The oscillator voltage
is the peak-to-peak amplitude of the sawtooth
waveform. The simplified model is represented sche-
matically in the following circuit.
These calculations can be applied to all current mode con-
verters using a similar slope compensating scheme.
Step 1.
S(L) =
Step 2.
S(L)’ =
Step 3.
V S(L)’
Step 4.
V
Step 5. Generate the Ramp Equations
Using superposition, the circuit can be illustrated as:
Figure 4. Simplified Circuit
Calculate the Inductor Downslope
di/dt =
Calculate the Reflected Downslope
to the Primary
S(L)/N
Calculate Equivalent Downslope Ramp
= S(L)’ R sense
Calculate the Oscillator Charge Slope
=
/
(Amps/Second)
(Amps/Second)
(Volts/Second)
(Volts/Second)
3-l07
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SLUA159 | Zero Voltage Switching Resonant Power Conversion |
| SM320C2810-EP | Digital Signal Processors |
| SM320C2811-EP | Digital Signal Processors |
| SM320C2812-EP | Digital Signal Processors |
| SM320F2810PBKAEP | Digital Signal Processors |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SLUA159 | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:Zero Voltage Switching Resonant Power Conversion |
| SLUC-MINIB-BLK | 制造商:IXYS Corporation 功能描述:SOLAR USB CHARGER BLACK |
| SLUFD128MU1U-A | 功能描述:USB閃存盤(pán) 128MB USB FLASHDRIVE USB Thumb Drive RoHS:否 制造商:Apacer 存儲(chǔ)容量:8 GB 最大工作電流: 最大工作溫度: 尺寸:53.4 mm x 23.3 mm x 7.5 mm 工作電源電壓:5 V |
| SLUFD128MU1UI-A | 功能描述:USB閃存盤(pán) 128M FLASH DRIVE RoHS:否 制造商:Apacer 存儲(chǔ)容量:8 GB 最大工作電流: 最大工作溫度: 尺寸:53.4 mm x 23.3 mm x 7.5 mm 工作電源電壓:5 V |
| SLUFD1GU1U2 | 制造商:STEC Inc 功能描述:1GB USB DRIVE,ESD ENCLOSURE - Bulk |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。