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參數資料
| 型號： | FAN8048 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | 2 DC-DC Converter & 4-CH PWM Motor IC |
| 中文描述： | DISK DRIVE MOTOR CONTROLLER, 0.5 A, PDSO48 |
| 封裝： | 7 X 7 MM, LQFP-48 |
| 文件頁數： | 21/34頁 |
| 文件大小： | 903K |
| 代理商： | FAN8048 |
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FAN8048
21
3-10. Boost (Step-up) converter mode (VIN < VSYS)
The step-up converter keeps the average output voltage VSYS higher than DC input voltage VIN, and its circuit diagram is
shown in Figure 15-a. Figure 15-b shows an operational waveform in case inductor current is steady-state. Since in steady-
state, the integral of the inductor voltage over one time period to zero, this can be expressed by the following formula:
From the above formula, a redefined formula is as follows after dividing by cycle Ts:
Assuming a lossless circuit, input and output power are the same (Pin=Po) and the above formula can be redefined as follows:
This can be expressed as follows using input/output current and duty ratio:
In the boundary condition of continuous mode and discontinuous mode, the inductor's average current is defined as follows:
From the above formula, since inductor current and input current are the same (i
IN
=i
L
), the average output current at the edge
of continuous conduction mode can be redefined as below:
In a practical synchronous step-up converter, the parasitic elements are due to the loss associated with the inductor, the capaci-
tor and the switches; however, in this formula we assume that all components are at ideal conditions.In the continuous mode,
as the output current and peak-peak voltage ripple are considered to be constant, this formula can be redefined as below:
=
Where,
0
)
)
((
)
(
=
×
+
×
OFF
SYS
IN
IN
t
V
V
t
V
ON
]
[
1
1
1
1
V
V
D
V
D
t
T
V
V
IN
SYS
OFF
S
IN
SYS
×
=
=
=
O
SYS
IN
IN
I
V
I
V
=
)
1
D
I
I
IN
O
=
2
,
)
1
2
2
T
1
2
1
D
D
L
V
S
T
L
V
i
i
SYS
ON
IN
peak
L
LB
=
=
=
2
)
1
2
D
D
L
V
T
I
SYS
S
OB
×
=
C
DT
R
V
C
DT
I
C
DT
Q
V
S
SYS
S
O
SYS
=
=
RC
V
V
S
SYS
SYS
=
]
[
=
O
SYS
I
V
R
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PDF描述 |
|---|---|
| FAN8082D | Bi-directional DC Motor Driver |
| FAN8082DTF | Bi-directional DC Motor Driver |
| FAN8082 | Bi-directional DC Motor Driver |
| FAN8100MTC | Low Voltage/Low Saturation 2-CH DC Motor Driver |
| FAN8100MTCX | Low Voltage/Low Saturation 2-CH DC Motor Driver |
相關代理商/技術參數 |
參數描述 |
|---|---|
| FAN8060 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:1.2MHz, 1A Synchronous Step-Down DC/DC Regulator |
| FAN8060EMPX | 功能描述:直流/直流開關調節器 1.2MHz, 1A Sync Step Down DC/DC RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| FAN8082 | 功能描述:馬達/運動/點火控制器和驅動器 DC Motor Driver RoHS:否 制造商:STMicroelectronics 產品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| FAN8082D | 功能描述:馬達/運動/點火控制器和驅動器 DC Motor Driver Bi Directional RoHS:否 制造商:STMicroelectronics 產品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| FAN8082DTF | 功能描述:馬達/運動/點火控制器和驅動器 DC Motor Driver Bi Directional RoHS:否 制造商:STMicroelectronics 產品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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