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TDA21231 Datasheet(PDF) 9 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) 9 Page - Infineon Technologies AG

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TDA21231
Data Sheet
8
Table 11
Timing Characteristics
Parameter
Symbol
Values
Unit
Note / Test Condition
Min.
Typ.
Max.
PWM tri-state to SW rising
delay
t_pts
15
ns
PWM tri-state to SW falling
delay
t_pts2
15
SW Shutdown hold-Off time
from PWM low
t_tsshd
50
SW Shutdown hold-Off time
from PWM high
t_tssh
50
PWM to SW turn-off
propagation delay
t_pdlu
20
PWM to SW turn-on
propagation delay
t_pdll
10
DR_EN turn-off propagation
delay falling
t_pdl_DR_EN
20
DR_EN turn-on propagation
delay rising
t_pdh_DR_EN
20
UVLO-BOOT-on time
t_UVLOBOOTon
200
Pulse pattern issued to GL in
UVLO-BOOT
UVLO-BOOT-off time
t_UVLOBOOToff
200
PWM minimum pulse width
ton_min_PWM
25
When PWM change is
recognized, the output remains
in the new state for these
minimum times.
PWM minimum off time
toff_min_PWM
30
5
Theory of Operation
The TDA21231 incorporates a high performance gate driver, one high-side power MOSFET and one low-side
power MOSFET in a single PG-IQFN-31-2 package. The advantages of this arrangement are found in the
areas of increased performance, increased efficiency and lower overall package and layout inductance.This
module is ideal for use in Synchronous Buck Regulators.
The power MOSFETs are optimized for 5 V gate drive enabling excellent high load and light load efficiency. The
gate driver is a robust high-performance driver rated at the switching node for DC voltages ranging from -1 V to
+21 V. The power density for transmitted power of this approach is approximately 90 W within a 25 mm
2 area.
5.1
Driver Characteristics
The gate driver of the TDA21231 has 2 voltage inputs, VCC and PVCC. VCC is the 5 V logic supply for the
driver. PVCC sets the driving voltage for the high side and low side MOSFETs. The reference for the gate driver
control circuit (VCC) is AGND. To decouple the sensitive control circuitry (logic supply) from a noisy
environment a ceramic capacitor must be placed between VCC and AGND close to the pins. PVCC needs also
to be decoupled using a ceramic capacitor (MLCC) between PVCC and PGND in close proximity to the pins.
PGND serves as reference for the power circuitry including the driver output stage.


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