EDE12400 查看數據表（PDF） - Unspecified
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EDE12400 Datasheet PDF : 8 Pages
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E-Lab Digital Engineering, Inc.
EDE12400
removed from the coil until the next chopper cycle (at 20KHz, the PWM period is 50us). Because the maximum
module current is 2 Amps per coil, care should be taken to ensure that the maximum voltage applied to the
Vref input is 1 Volt; otherwise current will exceed 2 Amps per coil and damage to the module may occur. To
aid in usage, a 1V output (pin 9) is available to drive a voltage divider or potentiometer. Using this 1V signal (as
opposed to +5V or more) ensures that the Vref current control input stays within the 0-1 Volt range. A simple
voltage divider arrangement uses two resistors in series with one end connected to the 1V output from the
module and the other end to ground. The connection point between the two resistors is then connected to the
Vref input as the input voltage for the current limit. As an example, to limit current flow to .5 Amps (500mA) per
coil one would need to place a voltage of 0.25V onto the Vref pin. This may be accomplished using a 5K and
a 20K resistor is series, with the 5K resistor connected to ground on one end. A potentiometer may also be used
as a voltage divider; one end connected to the 1V output of the module, the other to Ground, and the wiper
to the module’s Vref input. This arrangement is illustrated in Figure One.
Figure Two: Internal 297-298 Connection Block Diagram
As illustrated by Figure Two, connection to the internal current sense resistors is available externally to the
module at pin 18, the ‘0.5 Ohm GND’ pin. Ordinarily, when using the internal sense resistors, Sense Out A (pin
22) is connected to Sense In 1 (pin 21), Sense Out B (pin 20) is connected to Sense In 2 (pin 19), and 0.5 Ohm
GND (pin 18) is connected to GND. If the use of external sense resistors is desired instead (for instance, to
reduce power consumption), one leg of each of the two external sense resistors should be connected to Sense
Out A and Sense Out B with the other two legs grounded. The 0.5 Ohm GND (pin 18) should be left floating,
and Sense In 1 & Sense In 2 should be connected to sense Out A & Sense Out B, respectively. Care should be
taken to ensure that if external resistors are used they are capable of carrying the maximum coil current.
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