Datasheet

Operating Instructions List
2-3
Operating Instructions
For example, consider the load to be a TEC element and the dc control
voltage to be the output of a temperature control circuit. In this example,
as temperature increases the output of the temperature control circuit
increases. The TEC element should therefore be connected with the
anode at PWM and the cathode at H/C to ensure that the TEC element
cools when the temperature increases.
- Evaluation module jumpers, LEDs, and test points
5) Jumper J1 (FREQ) should be ON for normal operation.
When J1 is ON, the device is configured for 500-kHz operation.
When J1 is OFF, the device is configured for 100-kHz operation. However,
capacitor C9 must be removed and replaced with a 1-nF capacitor for
proper operation.
6) Jumper J2 (INT/EXT
) should be ON for normal operation.
When J2 is ON, the internal oscillator is used to generate the switching
outputs. When J2 is OFF, an external TTL-compatible clock signal can be
driven into the COSC pins of DRV593 and DRV594. In that case, the
capacitor C9 is removed and a wire is soldered to the pad closest to the IC
for connecting the external clock.
7) Jumper J3 (SHUTDOWN
) should be ON for normal operation. (Remove
J3 to place the DRV593 and DRV594 in shutdown mode.)
If an external shutdown control signal is to be used, it should be connected
to the right-hand pin of J3 (which is connected to resistor R5). The control
signal must be TTL-compatible; a logic high provides normal operation, a
logic low places the DRV593 and DRV594 in shutdown.
8) The LED D1 lights if FAULT1 is active, and LED D2 lights if FAULT0 is
active. If external fault monitoring is to be used, test point TP1 is connected
to FAULT1 and test point TP2 is connected to FAULT0. The pins and test
points go low when a fault is present, lighting the LEDs. The faults are
shown in the table below. Refer to the DRV593/594 data sheet (SLOS401)
for additional information on the fault indicators.
Table 2−2.Fault Indicators
FAULT1 FAULT0
0 0 Overcurrent
1 0 Undervoltage
0 1 Overtemperature
1 1 Normal operation
Note: 0 = LED ON (Fault) 1 = LED OFF (Normal)
- Power up
9) Verify correct voltage, verify input polarity, and set the external power
supply to ON. The EVM begins operation.