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TDA21231 Datasheet(PDF) 12 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) 12 Page - Infineon Technologies AG

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TDA21231
Data Sheet
11
5.5
UVLO
– BOOT Protection
After long tristate conditions the voltage of the boot capacitor may be too small to completely enhance the HS-
MOSFET when PWM enables GH directly after. Therefore, a monitoring circuit is being implemented to detect a
lower threshold at which GH can safely be turned on. If the voltage across the boot capacitor has been dropping
to this threshold a boot refresh circuit engages until an upper threshold has been reached.
The recharge is being done by intervals of repetitively pulling GL high for t_UVLOBOOTon followed by
t_UVLOBOOToff driving GL low to reset the output current to zero. When the voltage across the boot capacitor
has reached an upper threshold the recharge cycles stop.
The PWM input always takes priority over the boot refresh circuit when it is logic “H” or logic “L”.
6
Application
6.1
Implementation
Figure 6
Pin Interconnection Outline (example, transparent top view)
Note:
1. Pin PHASE is internally connected to SW node
2. It is recommended to place a RC filter between VCC and PVCC as shown.
3. Pins 24, 25 and 26 are not internally connected. One can leave them open or connect to GND or to SW.
4. RBOOT is only required for telecom applications with VIN > 13.2V (see Table 8). If necessary, its value should
be selected to limit the voltage spike V
PHASE-VPGND (AC) to 26V.


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