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PDF TDA21231 Data sheet ( Hoja de datos )
| Número de pieza | TDA21231 | |
| Descripción | DrMOS | |
| Fabricantes | Infineon | |
| Logotipo |  |
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DrMOSProductFamily
DrMOS5x5
TDA21231
DataSheet
Rev.2.2
Final
PowerManagementandMultimarket
1 page  
TDA21231
3.2 General Description
The Infineon TDA21231 is a multichip module that incorporates Infineon’s premier MOSFET technology for a
single high-side and a single low-side MOSFET coupled with a robust, high performance, high switching
frequency gate driver in a single PG-IQFN-31-2 package. The optimized gate timing allows for significant light
load efficiency improvements over discrete solutions.
When combined with Infineon’s family of digital multi-phase controllers, the TDA21231 forms a complete core-
voltage regulator solution for advanced micro and graphics processors as well as point-of-load applications.
Figure 3 Simplified Block Diagram
Data Sheet
4
5 Page 
TDA21231
Table 13 EN Pin Functionality
EN logic level
Low
High
Open (left floating, or High impedance)
Driver output
Shutdown : GL = GH = Low
Enable : GL = Active, GH = Active
Shutdown : GL = GH = Low
5.3 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.
PHFLT#
Output Logic
Level
“H”
Rising temperature
Falling
“L” temperature
Hysteresis
TPHFLT#_T
TPHFLT#_T - TPHFLT#_H
Tj
Figure 5 Thermal warning
5.4 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 regardless 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.
Data Sheet
10
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet TDA21231.PDF ] | |
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