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參數資料
| 型號： | FAN5038 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Dual Voltage Controller for DSP Power |
| 中文描述： | 雙電壓控制器的DSP電源 |
| 文件頁數： | 12/15頁 |
| 文件大小： | 84K |
| 代理商： | FAN5038 |
FAN5038
PRODUCT SPECIFICATION
12
REV. 1.0.2 7/6/00
copper on the PCB inner layers, it is recommended to use
those layers to route the high current paths in the design.
Capacitor Placement
One of the keys to a successful switch-mode power supply
design is correct placement of the low ESR capacitors.
Decoupling capacitors serve two purposes; first there must
be enough bulk capacitance to support the expected transient
current, and second, there must be a variety of values and
capacitor types to provide noise supression over a wide
range of frequencies. The low ESR capacitors on the input
side (5V) of the FET must be located close to the drain of the
power FET. Minimizing parasitic inductance and resistance
is critical in supressing the ringing and noise spikes on the
power supply. The output low ESR capacitors need to be
placed close to the output sense resistor to provide good
decoupling at the voltage sense point. One of the characteris-
tics of good low ESR capacitors is that the impedance gradu-
ally increases as the frequency increases. Thus for high
frequency noise supression, good quality low inductance
ceramic capacitors need to be placed in parallel with the low
ESR bulk capacitors. These can usually be 0.1μF 1206 sur-
face mount capacitors.
Figure 3. Examples of good and poor layouts
Example of
a Good layout
10
9
8
7
6
2
11
15
14
13
12
3
16
1
5
4
10
9
8
7
6
2
11
15
14
13
12
3
16
1
5
4
Example of
a Problem layout
SDRV
SWDRV
VREF
IFBH
IFBL
IFBL
IFBH
VREF
Noisy Signal
radiates onto
quiet pins
and trace is
too long.
Noisy Signal is
routed away from
quiet pins and
trace length is
kept under 0.5 in.
“
Quiet
”
Pins
=
CEXT
CEXT
Power and Ground Connections
The connection of VCCA to the 5V power supply plane
should be short and bypassed with a 0.1μF directly at the
VCCA pin of the FAN5038. The ideal connection would be a
via down to the 5V power plane. A similar arrangement
should be made for the VCCL pin that connects to +12V,
though this one is somewhat less critical since it powers only
the linear op-amp. Each ground should have a separate via
connection to the ground plane below.
MOSFET Gate Bias
Figure 4. 12V Gate Bias Configuration
+5V
47 W
VO
RSENSE
L1
D1
GNDP
Q1
+12V
CBULK
SDRV
VCCP
1uF
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PDF描述 |
|---|---|
| FAN5038M | Current-Mode SMPS Controller |
| FAN5056MV85 | High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms |
| FAN5059 | High Performance Programmable Synchronous |
| FAN5063 | ACPI Dual Switch Controller |
| FAN5063M | Power Supply Switching Circuit |
相關代理商/技術參數 |
參數描述 |
|---|---|
| FAN5038M | 功能描述:數字信號處理器和控制器 - DSP, DSC Dual Volt Controller DSP Power RoHS:否 制造商:Microchip Technology 核心:dsPIC 數據總線寬度:16 bit 程序存儲器大小:16 KB 數據 RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數量:35 定時器數量:3 設備每秒兆指令數:50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風格:SMD/SMT |
| FAN5038MX | 功能描述:數字信號處理器和控制器 - DSP, DSC Dual Volt Controller DSP Power RoHS:否 制造商:Microchip Technology 核心:dsPIC 數據總線寬度:16 bit 程序存儲器大小:16 KB 數據 RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數量:35 定時器數量:3 設備每秒兆指令數:50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風格:SMD/SMT |
| FAN503MTCX | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN5056MV85 | 功能描述:DC/DC 開關控制器 SOIC-WIDE-24 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| FAN5056MV85X | 功能描述:DC/DC 開關控制器 SOIC-WIDE-24 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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