SPMD150STP

Function description and application information

Doc ID 17160 Rev 1

13/23

module, fixing a typical 16 µs off time for both bridges. The toff value can be modified adding

a capacitor to GND1, increasing the off time, or adding a resistor to GND1 decreasing the

Off-time.

Figure 10.

toff setting circuit

Roff = Ra // 56k

Ω [kΩ], Coff = Ca + 470pF [pF]

Figure 11.

toff versus Roff and Coff

To set the maximum motor phase current it is necessary to give the proper reference voltage

at input VREFA (pin6) and VREFB (pin11).

following:

An internal 100 k

Ω resistor and a 470 pF capacitor are connected in parallel between

VREFx and GND1 (see Figure 12).