參數(shù)資料
型號： SP6122ACU-15
英文描述： Low Voltage, Micro 8, PFET, Buck Controller Ideal for 1A to 5A, Small Footprint, DC-DC Power Converters
中文描述： 低電壓，微8，PFET的，降壓控制器適合第1A至5A，占地面積小，DC - DC電源轉換器
文件頁數(shù)： 17/19頁
文件大?。?/td> 174K
代理商： SP6122ACU-15
17
Date: 10/02/04
SP6122 Low Voltage, Micro 8, PFET, Buck Controller Copyright 2004 Sipex Corporation
SP6122 Non-Synchronous Buck Design Calculator
STEADY STATE CALCULATION
Enter Values
Calculation Results
Formula
V
IN
= Input Voltage (V)
3.3
D = Duty Cycle
0.58
= V
OUT
/V
IN
V
OUT
= Output Voltage (V)
1.9
Iripple = Ripple Current (A)
1.22
= (V
IN
-V
OUT
)*V
OUT
/(Fs*1000*L*0.000001*V
IN
)
Fs = Switching Frequency (kHz)
300
Ipeak = Peak Inductor Current (A)
4.61
= I
OUT
+Iripple/2
I
OUT
= Load Current (A)
4
Output Ripple (mV)
42.75
= Iripple*ESRout
L = Inductance (
μ
H)
2.2
Iin = Max Input Current (A)
2.56
= I
OUT
*D/0.9
ESRin = Input Capacitor ESR (m
)
5
Max Input Ripple (mV)
96.99
= I
OUT
*ESRin+Iin*(1-D)/(Fs*C
IN
*0.000001)
C
IN
= Input Capacitance (
μ
F)
47
Iin_rms = Input Cap RMS Current (A)
1.98
= I
OUT
*SQRT(D*(1-D))
ESR
OUT
= Output Capacitor ESR (
)
35
EFFICIENCY CALCULATION
Enter Values
Calculation Results
Formula
RGH = GH Impedance (
)
4 Pic = IC Power (switching) (mW)
31.35
= Icc*V
IN
+Chs*V
IN
*Fs*0.001
PMOS
T
RISE
= SP6122 typ. PMOS rise time (ns) 20 Psch = Schottky Conducting Loss (mw)
848.48
= Vf*I
OUT
*(1-D)*1000
T
FALL
= SP6122 typ. PMOS rise time (ns) 40
Chs = PMOS Gate Charge @ V
IN
(nc)
15
Pch = PMOS Conducting Loss (mW)
202.67 = I
OUT
*I
OUT
*D*Rhs
Rhs = R
DS(ON)
@ V
IN
(m
)
22
Psh = PMOS Switching Loss (mW)
118.80 = 1/2*I
OUT
*V
IN
*(T
RISE
+T
FALL
)*Fs*0.001
Phs = Total PMOS Loss (mW)
321.47
= Pch + Psh
Vf = Schottky Forward Voltage
0.5
Pl = Inductor loss (mW)
192.00
= I
OUT
*I
OUT
*ESR_L
I
CC
= Supply Current (no switch) (mA)
5 Pc
IN
= Input Capacitor Loss(mW)
19.54
= ESR
IN
*Iin_rms*Iin_rms
ESR_L = Inductor ESR (m
)
12
Pltot = Total Power Losses
(mW)
1412.84
= Pic+Pls+Phs+Pl+Psch
Efficiency (%)
84.32
= V
OUT
*I
OUT
/(V
OUT
*I
OUT
- Pltot/1000)*100
SP6122 Design Calculator Example: Evaluation Board with 3.3V
IN
, 1.9V
OUT
Table 2, SP6122 Design Calculator, illus-
trates the calculations and formulas con-
tained in the Sipex Non-Synchronous Buck
Cad Calculator spreadsheet, (available in
the applications section of the Sipex website
at
www.sipex.com)
. The example shown is
the same SP6122 Evaluation Board used
previously with V
IN
= 3.3V, V
OUT
= 1.9V at
Table 2: Design Calculator
4A. As you can see, the SP6122 efficiency
at 4A output is calculated to be 84.3%.
Compare this with the Typical Performance
Characteristics curve of 84.5%, which is
very close considering the tolerances of
various components, and you see how use-
ful this easy design calculator is to evaluate
your SP6122 designs.
相關PDF資料
PDF描述
SP6122CU Evaluation Board Manual
SP6122EB Evaluation Board Manual
SP6122UEB Evaluation Board Manual
SP6122ACU-1.5 Low Voltage, Micro 8, PFET, Buck Controller Ideal for 1A to 5A, Small Footprint, DC-DC Power Converters
SP6122 Low Voltage, Micro 8, PFET, Buck Controller Ideal for 1A to 5A, Small Footprint, DC-DC Power Converters
相關代理商/技術參數(shù)
參數(shù)描述
SP6122ACU-15/TR 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage, Micro 8, PFET, Buck Controller Ideal for 1A to 5A, Small Footprint, DC-DC Power Converters
SP6122ACU-L 功能描述:DC/DC 開關控制器 Low Voltage, Micro 8 PFET Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
SP6122ACU-L/TR 功能描述:DC/DC 開關控制器 Low Voltage, Micro 8 PFET Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
SP6122ACU-L-1-5 制造商:Exar Corporation 功能描述:BUCK CONTROLLER LOW VOLT PFET 6122
SP6122CU 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Evaluation Board Manual
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