TPD7212FN

2020-07-03

6

© 2020

Toshiba Electronic Devices & Storage Corporation

7.2. Diagnosis of the driver power supply voltage

If at least one of VDH and VDL is abnormal, DIAG2 becomes H. Under some conditions, the low-side output

(UB, VB, WB) goes L.

All of these recover by themselves when the voltage returns to normal.

7.2.1. VDH under voltage detection

If VDH≤VDD+4.5V (Typ.), it is judged as abnormal and DIAG2 becomes H.

7.2.2. VDL under voltage detection

If VDH≤4.5V (typ.), It is judged as abnormal and DIAG2 becomes H.

7.2.3. VDL over voltage detection

If VDL≥18V (Typ.), it is judged as abnormal, and low side output (UB, VB, WB) becomes L and DIAG2

becomes H.

Note1: Driver power supply (VDH and VDL) is boosted by the charge pump. Boost operation will

start with VDD> 4.5V.

Note2: In order to prevent a malfunction, please enter the signal to IN1 to 6 after checking the

DIAG2 = "L".

Figure 7.2 Diagnosis of power supply for driver