TPL5111: Square wave on DRV pin

Part Number:TPL5111

Hi,

We bought the TPL5111EVM which works fine for a 20s timer.

I connected up the following pins to a separate TPL5111 chip as follows-

1. VDD (with 100uF cap to ground)
2. GND

3. DELAY - 97K6 and 16K9 resistor in parallel to ground

4. DONE - 100K to ground and connected to uC

5. DRV - connected to uC

6. EN - connected to VDD

When I apply power to the circuit, I am getting a continual 50ms square wave on the DRV pin. This doesn't happen on the EVM board.

I have checked my connections and components and cannot get the circuit to work properly.

Can anyone help?

Many Thanks,

Owen.