ZHCS819G March 2012 – March 2018 DRV110
Voltage at the OUT pin, that is the gate voltage of an external switching device, is equal to VIN voltage during the ON-cycle. The voltage is driven to ground during the OFF-cycle. VIN voltages below VZENER can be supplied directly from an external voltage source. Supply voltages of at least 6 V are supported.
The DRV110 is able to regulate VIN voltage from a higher external supply voltage, VS, by an internal bypass regulator that replicates the function of an ideal Zener diode. This requires that the supply current is sufficiently limited by an external resistor between VS and the VIN pin. An external capacitor connected to the VIN pin is used to store enough energy to charge the external switch gate capacitance at the OUT pin. A range of current limiting resistor sizes (RS,min and RS,max) can be calculated with Equation 5 and Equation 6. This range keeps the VIN current within the recommended operating conditions.
Ideally, the DRV110 device clamps the input voltage to 15 V. For configurations that do not use the EN pin (force the pin high or leave it floating), the DRV110 device clamps at 15 V (VZENER = 15 V) across the temperature range of the device. If the EN pin is set to 0, then refer to the values in Table 1 to find the VZENER used when calculating the value of RS, based on the temperature range of the application. Because the VZENER changes when the EN state changes, select a value for RS that meets the current requirements at both VZENER voltages.
|TEMPERATURE RANGE||ENABLE STATE||VZENER|
|–40°C ≤ TA ≤ 125°C||1||15 V|
|–40°C ≤ TA ≤ 35°C||0||15 V|
|–40°C ≤ TA ≤ 45°C||0||14.2 V|
|–40°C ≤ TA ≤ 55°C||0||13.9 V|
|–40°C ≤ TA ≤ 65°C||0||13.5 V|
|–40°C ≤ TA ≤ 75°C||0||13.1 V|
|–40°C ≤ TA ≤ 85°C||0||12.7 V|
|–40°C ≤ TA ≤ 95°C||0||12.3 V|
|–40°C ≤ TA ≤ 105°C||0||12 V|
|–40°C ≤ TA ≤ 115°C||0||11.4 V|
|–40°C ≤ TA ≤ 125°C||0||11 V|
The open-drain pulldown path at the STATUS pin is deactivated if the undervoltage lockout or thermal shutdown blocks have triggered or if the EN pin is low.