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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)： | 26/34頁 |
| 文件大小： | 903K |
| 代理商： | FAN8048 |
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FAN8048
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3-12. Considerations of Input and Output Capacitors in DC-DC converter
Input Capacitors
The input capacitor is necessary to minimize the peak current drawn from the battery. Typically a several ten times uF tantalum
capacitor is recommending. Low equivalent series resistance (ESR) capacitors will help to minimize battery voltage ripple.
Output Capacitors
Low ESR capacitors should be used at the output of the DC-DC converter to minimize output ripple. The high frequency
switching speeds and fast changes in the output capacitor current, mean that the equivalent impedance of the capacitor can con-
tribute greatly to the output ripple. In order to minimize these effects choose an output capacitor with less than 10nH of equiv-
alent series inductance (ESL) and less than 100mW of equivalent series resistance (ESR). Typically these characteristics are
met with ceramic capacitor, but may also be met with certain types of tantalum capacitor. For a step change of load, the output
filter inductor in Figure 19 acts as a source of constant current during in this load transient, and the change in load current as a
transient is supplied by the filter capacitor. Hence, following a load transient,
3-13. Layout and Ground Considerations
High frequency switching and large peak currents means PCB design for DC-DC converters requires careful consideration. A
general rule is to place the DC-DC converter circuitry well away from any sensitive RF or analog components. The layout of
the DC-DC converters and its external components are also based on some simple rules to minimize EMI and output voltage
ripple.
Layout
1. Place all power components, FAN8048, inductor, input capacitor and output capacitor as close together as possible.
2. Keep the output capacitor as close the FAN8048 as possible with very short traces to the VSYS and GND pins.
3. Keep the external feedback loop network as close the FAN8048 as possible with very short traces, but away from the four
channels output as far as possible.
Grounding
1. Use a star grounding system with separate traces for the power ground and the low power signals such as ON/OFF and
MUTE. The star should radiate from where the power supply enters the PCB.
2. On the multilayer boards use components side copper for grounding around the FAN8048 and connect back to a quiet
ground plane using vias.
Figure 19. ESR in the output capacitor
SYS
SYS
I
ESR
V
×
=
L
ESR
C
R=Load
i
L
Output Filter
V
SYS
i
SYS
相關(guān)PDF資料 |
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(guān)代理商/技術(shù)參數(shù) |
參數(shù)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(guān)調(diào)節(jié)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(guān)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(shù)量: 最大工作溫度: 安裝風(fēng)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(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(fēng)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(fēng)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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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