Proteus EEC-5550 Bruksanvisning
Proteus
Motionscykel
EEC-5550
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January 1996 1 MIC5018 Evaluation Board
MIC5018 Evaluation Board
IttyBitty™ High-Side MOSFET Driver
Description
The MIC5018 evaluation board is an assembled, high-side
switch for 2.7V to 9V power-switching applications.
Requirements
The MIC5018 evaluation board requires a power supply,
load, and logic output.
Operation
Connect the evaluation board as shown. A function genera-
tor with a TTL output, or a logic-level, square wave output, can
be used as a control signal. On/o power switch operation
can be simulated by setting the output frequency to about 1Hz
or 2Hz.
Applying logic high to the control input will energize the load;
logic low will de-energize the load.
The MIC5018 makes it possible to switch a supply as low as
2.7V using a logic-level MOSFET such as the IRL3103.
Because the IRL3103 also has a 20V maximum gate±
voltage rating, the MIC5018 evaluation board can switch a 5V
logic supply or higher voltage circuit without an additional
gate-to-source clamping zener. (Logic-level MOSFET gates
are usually rated at 10V maximum. See “MOSFET Selec-±
tion” in the MIC5018 data sheet for more information.)
Supply Precautions
The MIC5018 evaluation board includes a tantalum bypass
capacitor on the supply input. Always apply power using the
power supply’s on/o switch. Avoid applying power by
connecting the supply input to an operating power supply.
Applying power instantaneously to any tantalum capacitor
may cause capacitor failure.
Wiring
+–
Load
2.7V to 9V Supply
TTL
Control Logic
Your load here
or try a
100 1/4WΩ
resistor
MIC5018 Evaluation Board Wiring
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970
Bill of Materials
Item Qty. Description
—1Micrel, MIC5018BM4
IttyBitty™ high-side MOSFET driver
C1 1 AVX, TAJB475M020 Note 1
4.7µF 20V tantalum
Q1 1 International Rectifier, IRL3103 Note 2
14mΩ N-channel power MOSFET
Note 1: See “Operation: Supply Precautions” for information on safely
using tantalum capacitors.
Note 2: Manufacturer’s preliminary data sheet ratings:
14mΩ at VGS = 10V, ID = 34A, TJ = 25°C;
19m at VΩGS = 4.5V, ID = 28A, T J
= 25 C.°
The gate features logic-level performance with 20V maximum±
rating. Heat sinking is required at higher currents.
Load Precautions
A 100 , 1/4W resistor can be used as a low-current demon-Ω
stration load. When switching other loads, always stay within
the current rating of the MOSFET and power supply. See
Note 2, above.
The evaluation board MOSFET is located near the edge of
the board so that it can be fastened to a at heat sink.
Inductive loads require a Schottky diode to control the induc-
tive kick that occurs upon turno. Refer to the MIC5018 data
sheet for a connection example. At high current, leads to a
resistive load may also exhibit enough inductance to cause
signicant inductive kick.

MIC5018 Evaluation Board Micrel
MIC5018 Evaluation Board 2 January 1996
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL FAX + 1 (408) 944-0800 + 1 (408) 944-0970
This information is believed to be accurate and reliable; however, no responsibility is assumed by Micrel for its use nor for any infringement of patents or
other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.
© 1995 Micrel Incorporated
Schematic Diagram
> 2.4V = On
< 0.8V = Off VS
CTL
G
GND
MIC5018
C1
4.7µF
Q1
VS
1
2 3
4
* International Rectifier
100m
Ω
, 17A max.
TO-220 package
GND
LOAD
Load
GND
2.7V to 9V
Power
Supply
74HC04
or other logic
CTL
MIC5018 Evaluation Board Schematic Diagram
Printed Circuit Layout
Top Actual Size
Silk Screen (Top) Actual Size
Bottom Actual Size
Produktspecifikationer
Varumärke: | Proteus |
Kategori: | Motionscykel |
Modell: | EEC-5550 |
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