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參數(shù)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(shù)： | 27/34頁 |
| 文件大小： | 903K |
| 代理商： | FAN8048 |
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FAN8048
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4. Series Voltage Regulator and Battery Charger Function
As shown in Figure 20, if the external adaptor supplies high voltage (in general, adaptor voltage used for portable devices is
above 4.5V), the series voltage regulator is internally designed to be 4V so as to be suitable for circuit operation; and when
necessary, it has the function of battery charging using an external adaptor.
4.1 Non-charging mode (Series Voltage Regulator Function)
When battery-charging mode is unnecessary, CHGSW (pin27) input may be LOW. On this occasion, the output voltage VREG
(Voltage on pin18) of the series voltage regulator is internally designed to be 4.0V.
When DCIN(pin24) is not supplied (when VIN is connected from the batteries), this circuit is need diode(D1) for prevent the
VIN (Volatege on pin18) leakage current can not flow in to the IC.
The related formula for this is expressed as follows:
4.2 Charging mode (Battery Charger function)
To charge the battery using an external adaptor, CHGSW ( pin27) input should be HIGH. In charging mode, internal transistor
Q1 and external transistor Q3 are turned-on to connect the battery with the external adaptor.
On this occasion, charging current,
i
CHG
can be determined by current detection resistance Rs, and charging current is
obtained by the following formula:
Figure 20. Block Diagram of Regulator and Battery charger
]
[
)
×
)
2
1
1
((
,
V
V
R
R
V
SAT
Q
REG
=
+
=
]
[
5
R
A
I
S
CHG
=
0.5V
23
CHGCON
18
26
27
Charge_ON
DCIN
R1
R2
R
S
DCIN
VIN
REG
CHGSW
25
24
A
CHGSEN
Q3
i
CHG
Q2
Q1
DC-DC
Converter
D1
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相關(guān)代理商/技術(shù)參數(shù) |
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| 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 |
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| FAN8082 | 功能描述:馬達/運動/點火控制器和驅(qū)動器 DC Motor Driver RoHS:否 制造商:STMicroelectronics 產(chǎn)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(qū)動器 DC Motor Driver Bi Directional RoHS:否 制造商:STMicroelectronics 產(chǎn)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(qū)動器 DC Motor Driver Bi Directional RoHS:否 制造商:STMicroelectronics 產(chǎn)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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