參數(shù)資料
型號(hào)： NCP5322ADWG
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)： 28/31頁(yè)
文件大?。?/td> 726K
代理商： NCP5322ADWG
NCP5322A
http://onsemi.com
28
value. Allow for inductance “swing” at fullload 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 CTX1514771
from Coiltronics.
5. MOSFET & Heatsink Selection
The IPB05N03L from Infineon is chosen for both the
control and synchronous MOSFET due to its low R
DS(on)
and low gatecharge requirements. The following
parameters are derived from the IPB05N03L data sheet:
Rds
ON
= 3.9 m @ 10 V
Q
SWITCH
= 25 nC
Q
RR
= 45 nC
Q
OSS
= 35 nC
Vf
diode
= 0.86 V @ 25 A
JC
= 1.0
°
C/W
NCP5322A Parameters:
i
G
= 1.5 A
V
G
= 10 V
t_nonoverlap = 65 ns
The RMS value of the current in the control MOSFET is
calculated from Equation 20 and the previously derived
values for D, I
LMAX
, and I
LMIN
at the converter’s maximum
output current:
0.36
[(26.52
26.5
18.5
18.52) 3]1 2
(20)
IRMS,CNTL
[D
(ILo,MAX2
ILo,MIN2) 3]1 2
ILo,MAX
ILo,MIN
8.15 ARMS
Equation 19 is used to calculate the power dissipation of
the control MOSFET:
PD,CONTROL
(IRMS,CNTL2
QswitchIg
VIN
RDS(on))
VIN
(VIN
(ILo,MAX
(Qoss2
fSW)
QRR
fSW)
fSW)
(19)
(8.152ARMS
(26.5 A
3.9 m )
25 nC 1.5 A
12 V
220 kHz)
(35 nC 2
12 V
220 kHz)
(12 V
45 nC
220 kHz)
0.26 W
1.60 W
1.17 W
0.05 W
0.12 W
The RMS value of the current in the synchronous
MOSFET is calculated from Equation 27 and the previously
derived values for D, I
Lo,MAX
, and I
Lo,MIN
at the converter’s
maximum output current:
(27)
IRMS,SYNCH
(ILo,MAX2
[(1
D)
ILo,MAX
(26.52
ILo,MIN
ILo,MIN2) 3]1 2
18.52) 3]1 2
[(1
0.13)
26.5
18.5
21.1 ARMS
Equation 26 is used to calculate the power dissipation of
the synchronous MOSFET:
PD,SYNCH
(IRMS,SYNCH2
(Vfdiode
IO,MAX2
(21.12ARMS
(0.86 V
RDS(on))
t_nonoverlap
fSW)
(26)
3.9 m )
45 A 2
65 ns
220 kHz)
1.74 W
0.28 W
2.02 W
Equation 28 is used to calculate the heat sink thermal
impedances necessary to maintain less than the specified
maximum junction temperatures at 60
°
C ambient:
CNTL
(125
60
°
C) 1.6 W
1.0
°
C W
40
°
C W
SYNCH
If board area permits, a cost effective heatsink could be
formed by using a TO263 mounting pad of at least 1.5 in
2
for the upper MOSFET and 2.5 in
2
for the lower MOSFET
on a singlesided, 1 oz. copper PCB. The total required pad
area would be slightly less if the area were divided evenly
between top and bottom layers with multiple thermal vias
joining the two areas. To conserve board space, AAVID
offers clipon heatsinks for TO220 thruhole packages.
Examples of these heatsinks include #577002 (1
″ ×
0.75
″ ×
0.25
″
, 33
°
C/W at 2 W) and #591302 (0.75
″ ×
0.5
″ ×
0.5
″
,
29
°
C/W at 2 W).
(125
60
°
C) 2.02 W
1.0
°
C W
31
°
C W
6. Adaptive Voltage Positioning
First, to achieve the 220 kHz switching frequency, use
Figure 4 to determine that a 65 k resistor is needed for
R
OSC
. Then, use Figure 5 to find the V
FB
bias current at the
corresponding value of R
OSC
. In this example, the 65 k
R
OSC
resistor results in a V
FB
bias current of approximately
5.0 A. Knowing the V
FB
bias current, one can calculate the
required values for R
FBK1
and R
DRP
using Equations 29
through 31.
The noload position is easily set using Equation 29:
RFBK1
VNOLOADIBIASVFB
+30 mV 5.0 A
6.04 k
(29)
For inductive current sensing, the designer must calculate
the inductor’s resistance (R
L
) and approximate any
resistance added by the circuit board (R
PCB
). We found the
相關(guān)PDF資料
PDF描述
NCP5322ADWR2G Two−Phase Buck Controller with Integrated Gate Drivers and 5−Bit DAC
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
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
NCP5322ADWR2G 制造商:Rochester Electronics LLC 功能描述: 制造商:ON Semiconductor 功能描述:
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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*