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參數(shù)資料
| 型號(hào)： | FA3686V |
| 英文描述： | SMPS Controller |
| 中文描述： | 開關(guān)電源控制器 |
| 文件頁數(shù)： | 17/18頁 |
| 文件大小： | 389K |
| 代理商： | FA3686V |
FA3686V
17
3. Determining the output voltage of DC-DC converters
The ways to determine the output voltage of the DC-DC
converter of each channel is shown in Fig. 10 and the following
equations.
For ch1:
The output voltage of a boost circuit is determined by:
For ch2:
The output voltage of an inverting circuit is determined by:
The ratio of resistances is determined by:
(Use the absolute value of the Vout2 voltage.)
For ch3:
The output voltage of a series regulator is determined by:
4. Restriction of external discrete components and
recommended operating conditions
To achieve a stable operation of the IC, the value of external
discrete components connected to VCC, VREG, CS pins should
be within the recommended operating conditions. And the
voltage and current applied to each pin should be also within the
recommended operating conditions. If the pin voltage of OUT1,
OUT2, or VREG becomes higher than the VCC pin voltage, the
current flows from the pins to the VCC pin because parasitic
three diode exist between the VCC pin and these pins. Be careful
not to allow this current to flow.
5. Loss calculation of IC
Since it is difficult to measure IC loss directly, the calculation to
obtain the approximate loss of the IC connected directly to a
MOSFET is described below.
When the supply voltage is V
CC
, the current consumption of the
IC is I
CCA
, the total input gate charge of the driven MOSFET is
Qg and the switching frequency is fsw, the total loss Pd of the IC
can be calculated by:
Pd V
CC
(I
CCA
+ Qg fsw).
The value in this expression is influenced by the effects of the
dependency of supply voltage, the characteristics of temperature,
or the tolerance of parameter. Therefore, evaluate the
appropriateness of IC loss sufficiently considering the range of
values of above parameters under all conditions.
Example:
I
CCA
=3.0mA for V
CC
=3.3V in the case of a typical IC from the
characteristics curve. Qg=6nC, fsw=500kHz, the IC loss
“
Pd
”
is
as follows.
Pd 3.3 (3.0mA + 6nC 500kHz) 19.8mW
If two MOSFETs are driven under the same condition for 2
channels, Pd is as follows:
Pd 3.3 {3.0mA + 2 (6nC 500kHz)} = 29.7mW
IN1-
FB1
Vout1
R2
R1
OUT1
Vout1
9
15
14
+
(1.0V)
IN2-
FB2
Vout2
R4
R3
OUT2
Vout2
8
3
4
+
(1.0V)
VREG
13
IN3-
FB3
Vout3
R6
R5
Vout3
1
2
+
(1.0V)
Vout1 =R1 + R2
V
REF
R2
Vout2 =R3 + R4
V
REF
–
R4
R3
V
REG
R3
Vout3 =R5 + R6
V
REF
R6
R3=
R3
V
REG
–
V
REF
Vout2 + V
REF
Fig. 10
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FA3687V | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:SMPS Controller |
| FA3687V-H1 | 制造商:Fuji Electric 功能描述: |
| FA-37PS/1 | 制造商:Cinch Connectors 功能描述:ADAPTOR D FILTERED 37 WAY 制造商:Cinch Connectors 功能描述:37 way filtered D adaptor,5A 1000pF |
| FA-37PS/1-LF | 制造商:Cinch Connectors 功能描述:ADAPTOR D FILTERED 37WAY 制造商:Cinch Connectors 功能描述:ADAPTOR, D, FILTERED, 37WAY 制造商:Cinch Connectors 功能描述:ADAPTOR, D, FILTERED, 37WAY; Connector Type:Filtered D Sub Gender Changer; Convert From Connector:D Sub; Convert From Positions:37; Convert From Gender:Plug; Convert To Connector:D Sub; Convert To Positions:37; Convert To ;RoHS Compliant: Yes |
| FA3863X | 功能描述:LED ORANGE CLEAR 3MM HI BRIGHT RoHS:是 類別:光電元件 >> LED - Millicandela 等級(jí):2260mcd 正向電壓:2.1V 電流 - 測試:20mA 波長 - 主:590nm 波長 - 峰值:- 視角:- 透鏡類型:散射，有色 透鏡樣式/尺寸:圓頂橢圓，5.1mm x 3.7mm 封裝/外殼:徑向 尺寸/尺寸:- 高度:7.00mm 安裝類型:通孔 包裝:散裝 在特定電流下的光通量 - 測試:- |
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