EB04 Apex Microtechnology Corporation, EB04 Datasheet - Page 4

• Manufacturer Part Number: EB04
• Description: Motion Control
• Manufacturer: Apex Microtechnology Corporation

OPERATING
CONSIDERATIONS
POWER SUPPLY REQUIREMENTS
SUPPLY
be one supply. The V
the input logic. If a high voltage logic such as CMOS is
used it may be tied with the V
a 5V±10% supply
SPECIAL CONSIDERATIONS
GENERAL
in a digital or DSP based motion control system. Thermal,
overvoltage, overcurrent, and crossfi re protection circuits are
part of the user’s design.
Considerations;” and Application Note 30, “PWM Basics”
for much useful information in applying this part. These
Application Notes are in the “Power Integrated Circuits Data
Book” and on line at www.apexmicrotech.com.
GROUNDING AND BYPASSING
bypassing are one of the keys to success. The EB04 is
capable of generating 250W pulses with 30 n-second rise and
fall times. If improperly grounded or bypassed this can cause
horrible conducted and radiated EMI.
a separate power ground, named HVRTN, for each high
voltage supply. These grounds are not directly coupled. This
isolation helps minimize high current ground loops. Apex
recommends back to back high current diodes between logic
and power grounds; this will maintain isolation but keep
offset at a safe level. All grounds should tie together at one
common point in the system.
or larger capacitor between HV and HVRTN. This capacitor
should be a switching power grade electrolytic capacitor
with ESR rated at 20 kHz. This capacitor should be placed
physically as close to the EB04 as possible.
hundred milli-ohms or so ESR. Therefore, each section
must also be bypassed with a low ESR 1µF or larger
ceramic capacitor.
minimize the area of the loop containing high frequency
current. (The size of the antenna.) Therefore the 1µF ceramic
capacitors should bypass each HV to its return right at
the pins the EB04.
This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifi ciations are subject to change without notice.
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: [phone]
4
HV1
HV2
HV3
V
HV1, HV2, and HV3 may be used independently, or may
The EB04 is designed to give the user maximum fl exibility
Users should read Application Note 1, "General Operating
As in any high power PWM system, grounding and
In order to reduce conducted EMI, the EB04 provides
In order to reduce radiated EMI, Apex recommends a 50 µF
However, such a capacitor will typically have a few
In order to minimize radiated noise it is necessary to
dd
VOLTAGE
10.8V to 50V
10.8V to 50V
10.8V to 50V
4.75 – 5.25
dd
supply must be compatible with
cc
supplies. HCMOS requires
5A, continuous, 10A peak
5A, continuous, 10A peak
5A, continuous, 10A peak
105 mA
EBO4U REV. A OCTOBER 2001 © 2001 Apex Microtechnology Corporation
MAX CURRENT
SHOOT THROUGH PROTECTION
longer turn off delay. Therefore, turn on delay has been built
in, and turn on signals may be applied simultaneoulsy with the
turn off input to the other FET in that half bridge.
PROTECTION CIRCUITS
FETs when at logic “1”. This input may be used with user
designed temperature sensing and current sensing circuits
to shut down the FETs in the event of a detected unsafe
condition. This is recommended since the FETs may be
turned off this way even if the normal input logic or DSP
programming is faulty.
HEATSINK
application. When driving a 3-phase motor at 50V, 5 amps
with a 50 kHz PWM frequency, the EB04 should be provided
with suffi cient heatsink to dissipate 25 Watts.
complex set of calculations dependent on load, switching
frequency and duty cycle. Worse case switching losses
occur when driving an inductive load at maximum current
and maintaining a duty cycle large enough to keep the load
current moving in one direction only.
1. Mostly occurs during the "ON" transition of the upper
2. The switching time for the other two transistors is a function
1. The "ON" Duty Cycle and I
2. The "OFF" Duty Cycle and IE (I
APPLICATION REFERENCES:
following Application Notes:
Power FETs have a relatively short turn on delay, and a
The EB04 does not include protection circuits.
However, there is a shut down input which will turn off all
The heatsink for the EB04 should be sized for the
Determining the power dissipated internally involves a
Switching Losses in this case:
Conductive Losses are a function of:
For additional technical information please refer to the
AN 01: General Operating Considerations
AN 40: Using the Easy Bridge as a Brushless DC Motor
FET of the "sourcing" half-bridge and the "ON" transition
of the lower FET of the "sinking" half-bridge, and is
proportional to frequency.
of the "Reverse Recovery Time" of the respective body
diodes and is relatively short.
"sourcing" FET and the I
"sinking" FET.
diodes of the other two FETs in the half-bridges.
Driver
2
R
2
R
DS
avg
DS
(on) losses of the lower
(on) losses of the upper
x V
SD
) losses of the body
EB04