SLVAEF0 September   2020  – MONTH  TPS92630-Q1 , TPS92638-Q1

 

  1.   Trademarks
  2. 1Introduction
  3. 2Supply Line Transients In Automotive Rear Lamp Applications
  4. 3Recommended Circuit For Device Enable Control
  5. 4Implementation Results
  6. 5Summary

3 Recommended Circuit For Device Enable Control

A recommended practical circuit to disable the device according to the power supply voltage is shown in Figure 3-1. A Zener diode is connected between V(supply) and EN and a resistor is connected from EN pin to ground to set a proper working current for the Zener diode.

GUID-20200713-CA0I-K3Z9-3D54-NWCC27BX6DFL-low.gifFigure 3-1 Recommended EN Control Circuit

The EN pin logic input threshold is shown in Table 3-1. Select a Zener diode with which you can ensure that the EN pin is lower than 0.7 V when V(supply) is lower than 5 V in order to shut down the device. And the device can be enabled when EN is higher than 2 V as V(supply) increases. For example, using a Zener diode with 4.7 V, 5% reverse voltage, the TPS92630/8-Q1 will be disabled when V(supply) drops to 5.165 V (MIN), and enabled when V(supply) is higher than 6.935 V (MAX).

Table 3-1 EN Threshold Specification
Parameter MIN TYP MAX UNIT
VIL(EN) Logic input, low level 0 0.7 V
VIH(EN) Logic input, high level 2 V