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ITS4300S-SJ-D Datasheet(PDF) 17 Page - Infineon Technologies AG

Part No. ITS4300S-SJ-D
Description  Smart High-Side NMOS-Power Switch
Download  22 Pages
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Maker  INFINEON [Infineon Technologies AG]
Homepage  http://www.infineon.com
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ITS4300S-SJ-D Datasheet(HTML) 17 Page - Infineon Technologies AG

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Data Sheet
17
Rev 1.0, 2012-09-01
ITS4300S-SJ-D
Application Information
7.3
Special Feature Description
Figure 5
Special feature description
Energy stored in the load inductance is given by :
EL= IL²*L/2
While demagnetizing the load inductance the energy
dissipated by the Power-DMOS is:
EAS = ES + EL –ER
With an approximate solution for R L =0Ω:
EAS = ½ * L * IL² * {(1- VS / (VS -VDSCL)
When an inductive load is switched off a current path must be
established until the current is sloped down to zero (all energy
removed from the inductive load ). For that purpose the series
combination ZDSCL is connected between Gate and Drain of the
power DMOS acting as an active clamp .
When the device is switched off , the voltage at OUT turns
negative until V DSCL is reached.
The voltage on the inductive load is the difference between
VDSCL and VS.
If reverse voltage is applied to the device :
1.) Current via load resistance RL :
IRev1 = (VRev –VFDS) / RL
2.) Current via Input pin IN and dignostic pin ST :
IRev2 = IST+IIN ~ (VRev–VCC)/RIN +(VRev–VCC)/RST1,2
Current IST must be limited with the extrernal series
resistor RSTS. Both currents will sum up to:
IRev = IRev1+ IRev2
If over-voltage is applied to the V S-Pin:
Voltage is limited to VZDSAZ; current can be calculated:
IZDSAZ = (VS –VZDSAZ) / RGND
A typical value for RGND is 150
Ω.
In case of ESD pulse on the input pin there is in both
polarities a peak current IINpeak ~ VESD / RIN
ZL
IRev1
IRev2
LL
IL
LL
ER
RL
EL
EBatt
ELoad
ZL
IRev
Drain-Source power stage clamper VDSCL:
Energy calculation:
Supply over voltage:
Supply reverse voltage:
RGND
RGND
+VCC
VS
3
ITS4300S-SJ-D
1
RIN
5-8
GND
2
4
OUT
ST
IN
ZDIN
ZDST
IIN
ZDSAZ
ROUTPD
VS
3
ITS4300S-SJ-D
1
RIN
5-8
GND
2
4
OUT
ST
IN
ZDIN
ZDST
IIN
ZDSAZ
ROUTPD
RST1
RST2
VControl
VS
3
ITS4300S-SJ-D
1
RIN
5-8
GND
2
4
OUT
ST
IN
ZDIN
ZDST
IIN
ZDSAZ
ROUTPD
RGND
VS
3
ITS4300S-SJ-D
1
RIN
5-8
GND
2
4
OUT
ST
IN
ZDIN
ZDST
IIN
ZDSAZ
ROUTPD


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