IPS161HF datasheet(4/27 Pages) STMICROELECTRONICS

4 / 27 page

CoD

This pin cannot be left floating and can be used to program the cut-off delay time tcoff, see

Table 8. Protection and diagnostic through an external capacitor (CCoD). The cut-off function

can be completely disabled by connecting the CoD pin to GND through 1 kΩ resistor: in this

condition, the output channel remains in limitation condition, supplying the current to the load

until the input is forced LOW or the thermal shutdown threshold is triggered.

GND

IC ground.

The IC can be protected against reverse polarity using two different solutions:

1. Placing a resistor RGND between IC GND pin and load connection point to GND (RGND >

VCC/Icc, see Table 2. Absolute maximum rating). Note that power dissipated by RGND during

reverse polarity condition is Vcc^2/RGND.

2. Placing a diode in parallel to RGND

The diode must be selected such that its VRRM > |VCC| and power dissipation capability is

higher than VF*IS (see Table 4).

In normal operation (no reverse polarity), there is a voltage drop (ΔV) between GND of the

device and GND of the module.

Using option 1, ΔV = RGND * ICC.

Using option 2, ΔV = VF@(I

S).

Figure 3. Reverse polarity

VCC

IC supply voltage.

IPS160HF, IPS161HF

Pin description

DS13271 - Rev 2

page 4/27

IPS161HF 数据表(PDF) 4 Page - STMicroelectronics