- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄361102 > NCP5322ADWR2G (ON SEMICONDUCTOR) Two−Phase Buck Controller with Integrated Gate Drivers and 5−Bit DAC PDF資料下載
參數(shù)資料
| 型號(hào)： | NCP5322ADWR2G |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Two−Phase Buck Controller with Integrated Gate Drivers and 5−Bit DAC |
| 中文描述： | 1.5 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | LEAD FREE, SOIC-28 |
| 文件頁(yè)數(shù)： | 27/31頁(yè) |
| 文件大?。?/td> | 726K |
| 代理商： | NCP5322ADWR2G |
第1頁(yè)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)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)當(dāng)前第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)
NCP5322A
http://onsemi.com
27
3. Input Capacitor Selection
Use Equation 5 to determine the average input current to
the converter at fullload;
IIN,AVG
IO,MAX
45 A
D
(1.565 V 12 V) 0.81
5.87 A
(5)
Next, use Equations 6 to 10 with the fullload inductance
value of 770 nH:
ILo
(VIN
VOUT)
D (Lo
fSW)
(12 V
1.565 V)
(1.565 V 12 V)
(770 nH
220 kHz)
8.03 App
(10)
ILo,MAX
IO,MAX2
45 A 2
ILo2
8.03 App 2
26.5 A
(8)
ILo,MIN
IO,MAX2
45 A 2
ILo2
8.03 App 2
18.5 A
(9)
IC,MAX
ILo,MAX
26.5 A 0.81
IIN,AVG
5.87 A
20.63 A
(6)
IC,MIN
ILo,MIN
18.5 A 0.81
IIN,AVG
5.87 A
12.63 A
(7)
For the twophase converter, the input capacitor(s) RMS
current at fullload is then (Note: D = 1.565 V/12 V = 0.13):
ICIN,RMS
[2D
(IC,MIN2
IC,MIN
IC,IN
(11)
IC,IN23)
IIN,AVG2
(1
2D)]1 2
[0.26
(12.632
12.63
8.00
8.0023)
5.872
(1
0.26)]1 2
9.69 ARMS
At this point, the designer must decide between saving
board space by using higherrated/more costly capacitors or
saving cost by using more lowerrated/less costly
capacitors. To save board space, we choose the SP (Oscon)
series capacitors by Sanyo. Part number 16SP270: 270 F,
16 V, 4.4 A
RMS
, 18 m , 10
×
10.5 mm. This design will
require 9.69 A/4.4 A = 2.2 or N
IN
=
3 capacitors on the input
for a conservative design.
4. Input Inductor Selection
The input inductor must limit the input current slew rate
to less than 0.5 A/ s during a load transient from 0 to 45 A.
A conservative value will be calculated assuming the
minimum number of output capacitors (N
OUT
= 7), three
input capacitors (N
IN
= 3), worst case ESR values for both
the input and output capacitors, and a maximum duty cycle
(D = (1.850 V + 30 mV
AVP
)/12.0 V
IN
= 0.157).
Figure 27. Actual DC/DC Converter Circuitry With the
Calculated Input Inductor and Minimum Filtering
Components. The Measured SlewRate (dI
IN
/dt) of
the Input Current (0.064 A/ s) Is Much Lower Than
Expected (0.1 A/ s) Because of Input Voltage Drop,
Parasitic Inductance, and Lower Real ESRs Than
Specified in the Capacitors’ Data Sheets.
First, use Equation 15 to calculate the voltage across the
output inductor due to the 45 A load current being shared
equally between the two phases:
(15)
VLo
VIN
VOUT,NOLOAD
(IO,MAX2)
ESROUTNOUT
12 V
1.85 V
45 A 2
13 m
7
10.19 V
Second, use Equation 16 to determine the rate of current
increase in the output inductor when the load is first applied
(i.e. Lo has not changed much due to the DC current):
dILodt
VLoLo
10.19 V 1.1 H
9.26 V
s
(16)
Finally, use Equations 17 and 18 to calculate the minimum
input inductance value:
VCi
ESRINNIN
18 m
dILodt
9.26 V
D fSW
0.157 220 kHz
3
s
39.7 mV
(17)
LiMIN
VCi
39.7 mV 0.50 A
dIINdtMAX
s
80 nH
(18)
Next, choose the small, cost effective T3026 core from
Micrometals (33.5 nH/N
2
) with #16 AWG. The design
requires only 1.54 turns to achieve the minimum inductance
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| NCP5331FTR2G | Two-Phase PWM Controller with Integrated Gate Drivers |
| NCP5331 | Two-Phase PWM Controller with Integrated Gate Drivers |
| NCP5331FTR2 | Two-Phase PWM Controller with Integrated Gate Drivers |
| NCP5383 | Two Phase Buck Controller with Integrated Gate Drivers and AVP |
| NCP5422ADR2G | Dual Out−of−Phase Synchronous Buck Controller with Current Limit |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCP5331 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Two-Phase PWM Controller with Integrated Gate Drivers |
| NCP5331/D | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Two Phase PWM Controller with Integrated Gate Drivers |
| NCP5331_05 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Two-Phase PWM Controller with Integrated Gate Drivers |
| NCP5331FTR2 | 功能描述:DC/DC 開關(guān)控制器 2 Phase Buck w/Gate RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)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(fēng)格: 封裝 / 箱體:CPAK |
| NCP5331FTR2G | 功能描述:DC/DC 開關(guān)控制器 2 Phase Buck w/Gate Drivers for Athlon RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)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(fēng)格: 封裝 / 箱體:CPAK |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。