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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 26/31頁 |
| 文件大小： | 726K |
| 代理商： | NCP5322ADWR2G |
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NCP5322A
http://onsemi.com
26
VCSREF,MAX
VCOn,MAX
310 mV
D
2.45 V
(35)
where:
VCSREF,MAX
Max VID Setting w AVP @ Full Load
VCOn,MAX
[VCSn
(IO,MAX2
GCSA,MAX
VCSREF]
GCSA,MAX
RMAX
ILo2)
RMAX
RSENSEor (RL,MAX
RPCB,MAX)
11. Soft Start Time
If the Soft Start time is defined from the instant the Soft
Start pin is released (i.e. the converter is enabled) to when
the output reaches the VID setting with AVP then the Soft
Start time (t
SS
) can be calculated from:
TSS
VCOMP
CSSISS
(36)
where:
VCOMP
VOUT@ 0 A
Int_Ramp
Channel_Startup_Offset
GCSA
Ext_Ramp 2
C
SS
is the capacitor from the SoftStart pin to LGND;
Ext_Ramp = D
(V
IN
V
OUT
) / (R
CSn
C
CSn
f
SW
);
I
SS
is the SoftStart charge current from the data sheet.
Design Example
Typical Design Requirements:
V
IN
= 12.0 Vdc
V
OUT
= 1.60Vdc (nominal)
V
OUT,RIPPLE
< 10 mV
PP
max
VID Range: 1.100 Vdc 1.850 Vdc
I
O,MAX
= 45 A at fullload
I
OUT,LIM
= 52 A min at 55
°
C (shutdown threshold)
dI
IN
/dt = 0.50 A/ s max
f
SW
= 220 kHz
η
= 81% min at fullload
T
A,MAX
= 60
°
C
T
J,MAX
= 125
°
C
t
SS
< 10.0 ms (Soft Start time)
V
OUT
at noload (static) =
+30 mV from VID setting = 1.630 Vdc
V
OUT
at fullload (static) =
–35 mV from VID setting = 1.565 Vdc
V
OUT
at fullload (transient) =
65 mV from VID setting = 1.540 Vdc
1. Output Capacitor Selection
First, choose a lowcost, lowESR output capacitor
such as the Rubycon 16MBZ1500M10X20: 16 V, 1500 F,
2.55 A
RMS
, 13 m , 10
×
20mm. Calculate the minimum
number of output capacitors:
NOUT,MIN
ESR per capacitor
IO,MAX
VO,MAX
13 m
45 A (1.630 V
1.540 V)
6.5 or 7 capacitors minimum (10,500 F)
(1)
2. Output Inductor Selection
Calculate the minimum output inductance at I
O,MAX
according to Equation 4 with
±
20% inductor ripple current
(
α
= 0.20):
LoMIN
(VIN
VOUT)
VOUT
fSW)
1.565 V
220 kHz)
(
IO,MAX
(12 V
(0.2
VIN
1.565 V)
45 A
12 V
687 nH
(3)
To save cost, we choose the inexpensive T50
52B core
from Micrometals: 43.5 nH/N
2
, 3.19 cm/turn. According to
the Micrometals catalog, at 22.5 A (per phase) the
permeability of this core will be approximately 70% of the
permeability at 0 A. Therefore, at 0 A we must achieve at
least 687 nH/0.7 or 981 nH. Using five turns of #16AWG
bifilar (2 m /ft) will produce 1.1 H.
Use Equation 4 to insure the output voltage ripple will
satisfy the design goal with the minimum number of
capacitors and the nominal output inductance:
VOUT,PP
(ESR per cap
#Phases
NOUT,MIN)
D
(VIN
VOUT)
(LoMIN
fSW)
(4)
(13 m
(5.0 V
(1.86 m )
7)
2
1.6 V)
{2.38 A}
(1.6 V 5.0 V) (1.1 H
220 kHz)
4.43 mV
The output voltage ripple will be decreased when output
capacitors are added to satisfy transient loading
requirements.
We will need the nominal and worst case inductor
resistances for subsequent calculations:
RL
5 turns
3.19 cm turn
0.03218 ft cm
2 m
ft
1.03 m
The inductor resistance will be maximized when the
inductor is “hot” due to the load current and the ambient
temperature is high. Assuming a 40
°
C temperature rise of
the inductor at fullload and a 35
°
C ambient temperature
rise we can calculate:
RL,MAX
1.03 m
[1
0.39%
°
C
(40
°
C
35
°
C)]
1.33 m
The output inductance at fullload will be:
Lo
0.70
1.1 H
770 nH
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| NCP5331 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Two-Phase PWM Controller with Integrated Gate Drivers |
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| 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 |
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