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TDA21201 数据表(PDF) 9 Page - Infineon Technologies AG

部件名 TDA21201
功能描述  Integrated Switch(MOSFET Driver and MOSFETs)
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制造商  INFINEON [Infineon Technologies AG]
网页  http://www.infineon.com
标志 INFINEON - Infineon Technologies AG

TDA21201 数据表(HTML) 9 Page - Infineon Technologies AG

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Preliminary Data Sheet
TDA21201
Page 9
Apr-29, 2002
Over voltage protection of Vcc / Avalanche avoidance
The voltage at the Vcc pins of the TDA21201 rises above the nominal DC
value of the Vcc supply (= + 12 V) during the turn-off of the High Side
MOSFET. The voltage overshoots at the Vcc pins according to:
vcc(t) = Vcc + Lstray * di/dt
vcc (t) = instantaneous value of vcc; Vcc = +12 V DC; Lstray = stray
inductance of the PCB traces + the input capacitor’s ESL + the parasitic
inductance of the TDA21201 package itself; di/dt = slew rate of the High Side
current during its turn-off.
Vcc = +12 V
TDA21201
Lstray
HS
Cin
Lout
LS
This equation reveals that Lstray should be made as small as possible (as
vcc(t) is limited by the breakdown voltage of the device, Vcc is given by the
application, di/dt should be as large as possible to reduce switching losses)
using proper layout techniques and low ESL capacitors, e.g. ceramics,
between the Vcc and GND pins of the Integrated Switch.
To protect the Integrated Switch from unallowable voltage spikes, the slew rate
of the High Side current di/dt is controlled in a way so that the overall voltage
(between Vcc pins to GND pins) does not exceed 20 V (measured between
the Vcc and GND pins at the PCB, this voltage will slightly exceed the 20 V
limit within the package/at the chips). As the MOSFETs have a Breakdown
voltage rating Vds = 30 V, it is made sure that they are never driven into
avalanche.
The slew rate control is implemented using the principal of the active zener
clamp technique: When vcc(t) rises during turn-off then the effective gate-drain
voltage of the High Side MOSFET rises, too. If, for what reason ever, the vcc(t)
overshoot approaches a value that possibly could damage the integrated
Dz
Driver
t
V
< 20
vcc
HS is turned off


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