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參數(shù)資料
| 型號： | NCV8800 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Synchronous Buck Regulator with 1.0 Amp Switch |
| 中文描述： | 同步降壓穩(wěn)壓器的1.0安培開關(guān) |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 103K |
| 代理商： | NCV8800 |
NCV8800 Series
http://onsemi.com
10
The major advantage of constant frequency operation is
that the component selections, especially the magnetic
component design, become very easy. Oscillator frequency
is fixed at 200 kHz.
StartUp
After the NCV8800 is powered up, the error amplifier will
begin linearly charging the COMP pin capacitor. The COMP
capacitance and the source current of the error amplifier
determine the slew rate of COMP voltage. The output of the
error amplifier is connected internally to the inverting input
of the PWM comparator and it is compared with the divided
down output voltage FB1/FB2 at the noninverting input of
the PWM comparator. At the beginning of each switching
cycle, the oscillator output will set the PWM latch. This
causes the highside switch to turn on and the regulator
output voltage to ramp up.
When the divided down output voltage achieves a level set
by the COMP voltage, the highside switch will be turned
off. The V
2
control loop will adjust the highside switch
duty cycle as required to ensure the regulator output voltage
tracks the COMP voltage. Since the COMP voltage
increases gradually, Soft Start can be achieved.
Overcurrent Protection
The output switch is protected on both the high side and
low side. Current limit is set at 1.0 A (min).
Figure 9. 16 Lead SOW (4 Leads Fused), JA as
a Function of the Pad Copper Area (2 oz. Cu.
Thickness), Board Material = 0.0625 G10/R4
40
70
90
100
T
J
J
,
°
C
0
Copper Area (inch
2
)
0.5
1.0
1.5
2.0
3.0
80
60
50
2.5
Heat Sinks
A heat sink effectively increases the surface area of the
package to improve the flow of heat away from the IC and
into the surrounding air.
Each material in the heat flow path between the IC and the
outside environment will have a thermal resistance. Like
series electrical resistances, these resistances are summed to
determine the value of R
JA
:
RJA
RJC
RCS
where:
R
JC
= the junctiontocase thermal resistance,
R
CS
= the casetoheatsink thermal resistance, and
R
SA
= the heatsinktoambient thermal resistance.
R
JC
appears in the package section of the data sheet. Like
R
JA
, it too is a function of package type. R
CS
and R
SA
are
functions of the package type, heatsink and the interface
between them. These values appear in heat sink data sheets
of heat sink manufacturers.
RSA
(3)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCV8800/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Synchronous Buck Regulator with 1.0 Amp Switch |
| NCV8800HDW26 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Synchronous Buck RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| NCV8800HDW26G | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Synchronous Buck Automotive RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| NCV8800HDW26R2 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Synchronous Buck RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| NCV8800HDW26R2G | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Synchronous Buck Automotive RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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