Datasheet

Precautions
2-2
Operating Instructions
2.1 Precautions
Power Supply Input Polarity and Maximum Voltage
Always ensure that the polarity and voltage of the external power
connected V
DD
power input connector J8 is correct. Overvoltage or
reverse-polarity power applied to this terminal can damage the
evaluation module.
2.2 Operating Instructions List (See Figures 2−2 and 2−3.)
Table 2−1. Typical Jumper Settings
J1(FREQ) J2 (INT/EXT) J3 (SHUTDOWN)
ON ON ON
- Power supply
1) Ensure that all external power sources are set to OFF.
2) Connect a 2.8-V to 5.5-V power supply to J8 (V
DD
) and J9 (GND), taking
care to observe proper polarity.
- Inputs and outputs
3) Connect a dc control voltage to J4 (IN+), ranging from ground to V
DD
. The
terminal J5 (IN−) is held to V
DD
/2 with a resistor voltage divider, as shown
in the schematic. Therefore, a dc control voltage of V
DD
/2 provides 0-V
output from PWM to H/C.
If a different bias or offset is required, replace the voltage divider resistors
R7 and R8. To minimize gain error due to imbalance in the impedance of
the differential input stage, the value of R7 and R8 in parallel should not
exceed 1 kΩ. Alternatively, the resistor divider may be removed and a
different common voltage output (such as from an op-amp buffer or a
power supply) may be connected to J5 (IN−).
Note:
The common mode input range of the DRV593 and DRV594 are 1.2 V to
3.8 V when using a 5-V supply, and 1.2 V to 2.1 V when using a 3.3-V supply.
Refer to the DRV593/594 data sheet, SLOS401.
4) Connect a load across J6 (PWM) and J7 (H/C). The polarity of the
connection depends on the operation of the dc control voltage. As the
voltge at IN+ becomes greater than the voltage at IN−, the voltage at PWM
increases and the H/C voltage remains at ground. The differential voltage
created causes current to flow from PWM to H/C. Similarly, as the voltage
at IN+ decreases lower than IN−, the voltage at H/C goes to V
DD
and the
PWM voltage decreases. The differential voltage increases in the
opposite direction, causing current to flow from H/C to PWM.