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TDA21231 Datasheet(PDF) 11 Page - Infineon Technologies AG

Part No. TDA21231
Description  DrMOS Product Family
Download  19 Pages
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

TDA21231 Datasheet(HTML) 11 Page - Infineon Technologies AG

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Data Sheet
Table 13
EN Pin Functionality
EN logic level
Driver output
Shutdown : GL = GH = Low
Enable : GL = Active, GH = Active
Open (left floating, or High impedance)
Shutdown : GL = GH = Low
Thermal protection
The PHFLT# pin is a digital monitoring output for the thermal warning. It does not affect the operation of the
driver nor does it shut down the device.
When the driver junction temperature exceeds the thermal warning threshold of 140 °C (typ) the open drain
output PHFLT# will be pulled low. Externally PHFLT# has to be connected to a supply (e.g. +3.3 V) by a resistor
in the range of 10 k
 When the temperature of the driver junction decreases below the level of thermal warning
threshold minus hysteresis (10 K typ.), the pin PHFLT# is released. VPHFLT# is being pulled up by the external
resistance. If the thermal warning feature is not used the pin can be left floating.
Figure 5
Thermal warning
Shoot Through Protection
The TDA21231 driver includes gate drive functionality to protect against shoot through. In order to protect the
power stage from overlap, both high-side and low-side MOSFETs being on at the same time, the adaptive
control circuitry monitors specific voltages. When the PWM signal transitions to low, the high-side MOSFET will
begin to turn off after the propagation delay time t_pdlu. When VGS of the high-side MOSFET is discharged
below 1 V (a threshold below which the high-side MOSFET is off), a secondary delay t_pdhl is initiated. After
that delay the low-side MOSFET turns on r
egardless of the state of the “SW” pin. It ensures that the converter
can sink current efficiently and the bootstrap capacitor will be refreshed appropriately during each switching
cycle. See Figure 8 for more detail.
Output Logic
Rising temperature

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