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參數(shù)資料
| 型號： | NCP5322A |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | TWO-PHASE BUCK CONTROLLER WITH INTEGRATED GATE DRIVERS AND 5-BIT DAC |
| 中文描述： | 兩相降壓控制器，它集成柵極驅(qū)動器和5位DAC |
| 文件頁數(shù)： | 26/32頁 |
| 文件大?。?/td> | 1091K |
| 代理商： | NCP5322A |
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NCP5322A
http://onsemi.com
26
3. Input Capacitor Selection
Use Equation 5 to determine the average input current to
the converter at full
–
load;
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 full
–
load 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 two
–
phase converter, the input capacitor(s) RMS
current at full
–
load 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 higher
–
rated/more costly capacitors or
saving cost by using more lower
–
rated/less costly
capacitors. To save board space, we choose the SP (Oscon)
series capacitors by Sanyo. Part number 16SP270: 270
μ
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/
μ
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 Slew
–
Rate (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,NO
–
LOAD
(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 T30
–
26 core from
Micrometals (33.5 nH/N
2
) with #16 AWG. The design
requires only 1.54 turns to achieve the minimum inductance
value. Allow for inductance
“
swing
”
at full
–
load by using
three turns. The input inductor
’
s value will be:
Li
32
33.5 nH N2
301 nH
This inductor is available as part number CTX15
–
14771
from Coiltronics.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| NCP5322ADW | TWO-PHASE BUCK CONTROLLER WITH INTEGRATED GATE DRIVERS AND 5-BIT DAC |
| NCP5322ADWR2 | STATIC PROTECTION RoHS Compliant: Yes |
| NCP5332ADW | Two-Phase Buck Controller with Integrated Gate Drivers and 5-Bit DAC |
| NCP5332ADWR2 | Two-Phase Buck Controller with Integrated Gate Drivers and 5-Bit DAC |
| NCP5332A | Two-Phase Buck Controller with Integrated Gate Drivers and 5-Bit DAC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCP5322A/D | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Two-Phase Buck Controller with integrated Gate Drivers and 5-Bit DAC |
| NCP5322A_07 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Two−Phase Buck Controller with Integrated Gate Drivers and 5−Bit DAC |
| NCP5322ADW | 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 |
| NCP5322ADWG | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Two−Phase Buck Controller with Integrated Gate Drivers and 5−Bit DAC |
| NCP5322ADWR2 | 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 |
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