EDE12400 查看數據表（PDF） - Unspecified
零件编号
产品描述 (功能)
生产厂家
EDE12400 Datasheet PDF : 8 Pages
| |||
E-Lab Digital Engineering, Inc.
EDE12400
Synchronizing Multiple Modules
The SYNC pin (pin 11) makes the output of the chopper drive clock available externally. If multiple EDE12400
modules are to be used in a system (see Figure Three), the SYNC pins should be tied together and all but one
OSC pin (pin 10) connected to Ground. The module with the ungrounded OSC pin generates the clock
frequency.
NOTE: Although they may be operated independently, synchronizing EDE12400 Modules as illustrated in Figure
Three reduces the possibility of noise interference between the chopper drivers of the modules.
If a module (or modules) are to be given an external chopper drive signal (for instance, to use a frequency
other than 20KHz), all the OSC pins should be connected to ground and the desired signal input into the SYNC
pin(s) as a 0-5V square wave. This drive frequency should not exceed 40MHz.
In applications where the chopper drivers are to be disabled, The Sense Out A, Sense Out B, Sense In 1, and
Sense In 2 pins must all be connected to ground. The Vref input should be connected to ground as well, and
the 0.5 Ohm GND pin may be left unconnected. It is important to remember that with the chopper driver
deactivated the motor supply voltage must not exceed the motor’s rated volatge.
For additional details on coil current sensing or driver synchronization, please refer to the L297 datasheet and
the L297 Application Note.
Figure Three: Synchronizing the Chopper Drivers of Multiple EDE12400’s
Phase vs. Enable Chopping
The CONTROL input (pin 6) selects one of two types of chopping that is performed by the module. When
CONTROL is low the chopper acts on INH1 and INH2; when high it acts on phase lines ABCD. When the
chopper acts on inhibit lines INH1 and INH2, coil current decay is accelerated due to current recirculation
through the active output transistors & clamp diodes. Ordinarily the CONTROL input should be connected to
ground to provide maximum motor speeds, but in some instances (especially with small motor coils that are not
able to store much energy) it is advantageous to chop phase lines ABCD instead (CONTROL input high) to
enhance available torque. For a complete discussion of the two types of chopping please refer to pages 8-12
of the L297 Application Note.
www.elabinc.com
6
Share Link: 