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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 |
| 文件頁數(shù)： | 20/31頁 |
| 文件大?。?/td> | 726K |
| 代理商： | NCP5322ADWG |
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NCP5322A
http://onsemi.com
20
current (I
O,MAX
), the per capacitor ESR of the output
capacitors (ESR
OUT
), and the number of the output
capacitors (N
OUT
) as shown in Figure 16. Assuming the load
current is shared equally between the two phases, the output
voltage at full, transient load will be:
VOUT,FULLLOAD
VOUT,NOLOAD
(14)
(IO,MAX2)
ESROUTNOUT
+
+
Vi
12 V
Li
TBD
Ci
3
×
16SP270
ESR
Ci
18 m/3 = 6.0 m
Q2
Q1
Lo
700 nH
ESR
Co
13 m/7 = 1.9 m
22.5 u(t)
Co
7
×
16MBZ1500M10X20
Vi(t = 0) = 12 V
SWNODE
Vo(t = 0) = 1.630 V
V
Ci
I
Lo
V
OUT
I
Li
MAX dI/dt occurs in
first few PWM cycles.
Figure 16. Calculating the Input Inductance
+
When the control MOSFET (Q1 in Figure 16) turns ON,
the input voltage will be applied to the opposite terminal of
the output inductor (the SWNODE). At that instant, the
voltage across the output inductor can be calculated as:
VLo
VIN
VIN
VOUT,FULLLOAD
VOUT,NOLOAD
(IO,MAX2)
(15)
ESROUTNOUT
The differential voltage across the output inductor will
cause its current to increase linearly with time. The slew rate
of this current can be calculated from:
dILodt
VLoLo
(16)
Current changes slowly in the input inductor so the input
capacitors must initially deliver the vast majority of the
input current. The amount of voltage drop across the input
capacitors ( V
Ci
) is determined by the number of input
capacitors (N
IN
), their per capacitor ESR (ESR
IN
), and the
current in the output inductor according to:
VCi
ESRINNIN
ESRINNIN
dILodt
dILodt
tON
D fSW
(17)
Before the load is applied, the voltage across the input
inductor (V
Li
) is very small the input capacitors charge to
the input voltage, V
IN
. After the load is applied the voltage
drop across the input capacitors, V
Ci
, appears across the
input inductor as well. Knowing this, the minimum value of
the input inductor can be calculated from:
LiMIN
VLi
VCi
dIINdtMAX
dIINdtMAX
(18)
dI
IN
/dt
MAX
is the maximum allowable input current slew
rate.
The input inductance value calculated from Equation 18
is relatively conservative. It assumes the supply voltage is
very “stiff” and does not account for any parasitic elements
that will limit dI/dt such as stray inductance. Also, the ESR
values of the capacitors specified by the manufacturer’s data
sheets are worst case high limits. In reality input voltage
“sag,” lower capacitor ESRs, and stray inductance will help
reduce the slew rate of the input current.
As with the output inductor, the input inductor must
support the maximum current without saturating the
magnetic. Also, for an inexpensive iron powder core, such
as the 26 or 52 from Micrometals, the inductance “swing”
with DC bias must be taken into account inductance will
decrease as the DC input current increases. At the maximum
input current, the inductance must not decrease below the
minimum value or the dI/dt will be higher than expected.
5. MOSFET & Heatsink Selection
Power dissipation, package size, and thermal solution
drive MOSFET selection. To adequately size the heat sink,
the design must first predict the MOSFET power dissipation.
Once the dissipation is known, the heat sink thermal
impedance can be calculated to prevent the specified
maximum case or junction temperatures from being exceeded
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| 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 |
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