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參數(shù)資料
| 型號： | EKK8011 |
| 英文描述： | Low-Voltage, Single Supply, SPST, High Performance Analog Switches; Temperature Range: -40°C to 85°C; Package: 8-SOIC T&R |
| 中文描述： | 的USB PS / 2鍵盤控制器 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 465K |
| 代理商： | EKK8011 |
MAX5942A/MAX5942B
IEEE 802.3af Power-Over-Ethernet
Interface/PWM Controller for Power Devices
20
______________________________________________________________________________________
COMPONENT
SUPPLIERS
WEBSITE
International Rectifier
www.irf.com
Fairchild
www.fairchildsemi.com
Power FETS
Vishay-Siliconix
www.vishay.com/brands/siliconix/main.html
Dale-Vishay
www.vishay.com/brands/dale/main.html
Current-Sense Resistors
IRC
www.irctt.com/pages/index.cfm
ON Semi
www.onsemi.com
General Semiconductor
www.gensemi.com
Diodes
Central Semiconductor
www.centralsemi.com
Sanyo
www.sanyo.com
Taiyo Yuden
www.t-yuden.com
Capacitors
AVX
www.avxcorp.com
Coiltronics
www.cooperet.com
Coilcraft
www.coilcraft.com
Magnetics
Pulse Engineering
www.pulseeng.com
Table 3. Component Suppliers
6) Choose RSENSE according to the following equation:
where:
VILIM is the current-sense comparator trip threshold
voltage (0.465V).
NS/NP is the secondary-side turns ratio (5/14 in this
example).
IOUTMAX is the maximum DC output current (10A in
this example):
7) Choose the inductor value so that the peak ripple
current (LIR) in the inductor is between 10% and
20% of the maximum output current:
where VD is the output Schottky diode forward-volt-
age drop (0.5V) and LIR is the ratio of inductor rip-
ple current to DC output current:
8) The size and ESR of the output filter capacitor deter-
mine the output ripple. Choose a capacitor with a
low ESR to yield the required ripple voltage.
Use the following equations to calculate the peak-to-
peak output ripple:
where:
VRIPPLE is the combined RMS output ripple due to
VRIPPLE,ESR, the ESR ripple, and VRIPPLE,C, the
capacitive ripple. Calculate the ESR ripple and
capacitive ripple as follows:
VRIPPLE,ESR = IRIPPLE x ESR
VRIPPLE,C = IRIPPLE/(2 x
π x 275kHz x COUT)
Layout Recommendations
All connections carrying pulsed currents must be very
short, be as wide as possible, and have a ground plane
as a return path. The inductance of these connections
must be kept to a minimum due to the high di/dt of the
currents in high-frequency switching power converters.
Current loops must be analyzed in any layout pro-
posed, and the internal area kept to a minimum to
reduce radiated EMI. Ground planes must be kept as
intact as possible.
VV
V
RIPPLE
RIPPLE ESR
RIPPLE C
=+
,,
22
L
-
≥ ()
×
()
××
=
5 5
1 0 198
0 4 275
10
401
..
.
kHz
A
H
L
V-
OUT
≥
+
()×()
××
×
VD
LIR
kHz I
D
MIN
OUTMAX
1
2
275
RSENSE ≤
××
=
0 465
6
14
12 10
90 4
.
V
m
R
V
N
SENSE
ILIM
S
P
≤
××
12
.IOUTMAX
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| EKK8301 | Low-Voltage, Single Supply, SPST, High Performance Analog Switches; Temperature Range: -40°C to 85°C; Package: 8-SOIC T&R |
| EKM6211 | Ultra Low ON-Resistance, Single Supply, Dual SPST Analog Switches; Temperature Range: -40°C to 85°C; Package: 8-MSOP |
| EKM8003 | Ultra Low ON-Resistance, Single Supply, Dual SPST Analog Switches; Temperature Range: -40°C to 85°C; Package: 8-MSOP T&R |
| EKM8021 | Ultra Low ON-Resistance, Single Supply, Dual SPST Analog Switches; Temperature Range: -40°C to 85°C; Package: 8-MSOP T&R |
| EKM8022 | Ultra Low ON-Resistance, +1.1V to +4.5V Single Supply, SPDT Analog Switch; Temperature Range: -40°C to 85°C; Package: 6-SC-70 T&R |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EKK8011AB | 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:USB & PS/2 Keyboard Encoder |
| EKK8301 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PS/2 keyboard controller |
| EKK-EVALBOT | 功能描述:開發(fā)板和工具包 - ARM Keil Stellaris Eval Robot RoHS:否 制造商:Arduino 產(chǎn)品:Development Boards 工具用于評估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口類型:DAC, ICSP, JTAG, UART, USB 工作電源電壓:3.3 V |
| EKK-LM3S1968 | 功能描述:開發(fā)板和工具包 - ARM Stellaris Eval Kit w/ ARM/Keil Tools RoHS:否 制造商:Arduino 產(chǎn)品:Development Boards 工具用于評估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口類型:DAC, ICSP, JTAG, UART, USB 工作電源電壓:3.3 V |
| EKK-LM3S1968 | 制造商:Texas Instruments 功能描述:LM3S1968 MCU Eval Kit w/ Keil RealView M |
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