參數(shù)資料
型號(hào)： 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(pán)控制器
文件頁(yè)數(shù)： 11/24頁(yè)
文件大?。?/td> 465K
代理商： EKK8011
MAX5942A/MAX5942B
IEEE 802.3af Power-Over-Ethernet
Interface/PWM Controller for Power Devices
______________________________________________________________________________________
19
VOUT = Output voltage (5V).
VD1 = Voltage drop across D1 (typically 0.5V for
power Schottky diodes).
DMAX = Minimum value of maximum operating duty
cycle (44%).
VIN_MIN = Minimum input voltage (30V).
In this example:
Choose NP based on core losses and DC resis-
tance. Use the turns ratio to calculate NS, rounding
up to the nearest integer. In this example, NP = 14
and NS = 6.
For a forward converter, choose a transformer with a
magnetizing inductance in the neighborhood of
200H. Energy stored in the magnetizing inductance
of a forward converter is not delivered to the load
and must be returned back to the input; this is
accomplished with the reset winding.
The transformer primary to secondary leakage
inductance should be less than 1H. Note that all
leakage energy is dissipated across the MOSFET.
Snubber circuits may be used to direct some or all
of the leakage energy to be dissipated across a
resistor.
To calculate the minimum duty cycle (DMIN), use the
following equation:
=
where VIN_MAX is the maximum input voltage (67V).
4) The reset winding turns ratio (NR/NP) needs to be
low enough to guarantee that the entire energy in
the transformer is returned to V+ within the off cycle
at the maximum duty cycle. Use the following equa-
tion to determine the reset winding turns ratio:
where:
NR/NP = Reset winding turns ratio.
DMAX’ = Maximum value of maximum duty cycle:
Round NR to the nearest smallest integer.
The turns ratio of the reset winding (NR/NP) determines
the peak voltage across the N-channel MOSFET.
Use the following equation to determine the maxi-
mum drain-source voltage across the N-channel
MOSFET:
VDSMAX = Maximum MOSFET drain-source voltage.
VIN_MAX = Maximum input voltage:
Choose MOSFETs with appropriate avalanche
power ratings to absorb any leakage energy.
5) Choose the tertiary winding turns ratio (NT/NP) so that
the minimum input voltage provides the minimum
operating voltage at VDD (13V). Use the following
equation to calculate the tertiary winding turns ratio:
where:
VDDMIN is the minimum VDD supply voltage (13V).
VDDMAX is the maximum VDD supply voltage (30V).
VIN_MIN is the minimum input supply voltage (30V).
VIN_MAX is the maximum input supply voltage (67V
in this design example).
NP is the number of turns of the primary winding.
NT is the number of turns of the tertiary winding:
Choose NT = 7.
13 7
4
36 7
14
639
7 67
..
30
1N
67
N
T
×≤
≤
×
≤≤
V
NN
V
N
DDMIN
IN_MIN
PT
DDMAX
IN_MAX
P
+
×≤
≤
+
×
07
.
V1 +
14
DSMAX ≥×
=
67
134
VV
1 +
N
DSMAX
IN_MAX
P
R
≥×
N1
1- 0.5
0.5
R ≤×
=
414
NN
1-D
D
RP
MAX
≤×
′
D
V
N
-V
MIN
OUT
IN_MAX
S
P
D1
=
×
N
5V + 0.5V 0.44
S
P
≥
×
()
×
=
044 30
0 395
.
V
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(chēng):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(chēng):未知廠家 功能描述:PS/2 keyboard controller
EKK-EVALBOT 功能描述:開(kāi)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(píng)估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口類(lèi)型:DAC, ICSP, JTAG, UART, USB 工作電源電壓:3.3 V
EKK-LM3S1968 功能描述:開(kāi)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(píng)估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口類(lèi)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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