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BSP742-RI |BSP742RIINFINEONN/a84avaiSmart High Side Switches


BSP742-RI ,Smart High Side SwitchesBlock Diagram+ VbbVoltageGateOvervoltage Currentsourceprotection limit protectionVLogicOUTLimit for ..
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BSP742-RI
Smart High Side Switches
BSP 742 RI
Smart Power High-Side-Switch
Product Summary
Features

• Overload protection
• Current limitation
• Short circuit protection
• Thermal shutdown with restart
• Overvoltage protection (including load dump)
• Fast demagnetization of inductive loads
• Reverse battery protection with external resistor
• Open drain diagnostic output
• CMOS compatible input
• Loss of GND and loss of Vbb protection
• ESD - Protection
• Very low standby current
Application

• All types of resistive, inductive and capacitive loads
• µC compatible power switch for 12 V and 24 V DC applications
• Replaces electromechanical relays and discrete circuits
General Description

N channel vertical power FET with charge pump, ground referenced CMOS compatible input
and diagnostic feedback, monolithically integrated in Smart SIPMOS technology.
Providing embedded protective functions.
BSP 742 RI
Block Diagram

+ Vbb
Signal GND
ESD
miniPROFET
OUT
GND
Logic
Voltage
source
Charge pump
Level shifterTemperature
sensorRectifier
Limit forunclamped
ind. loads
Gate
protection
Current
limit
Load GND
Load

VLogic
Overvoltage
protection
Pin configuration
BSP 742 RI
Maximum Ratings at Tj = 25°C, unless otherwise specified
Thermal Characteristics

1Device on 50mm*50mm*1.5mm epoxy PCB FR4 with 6 cm2 (one layer, 70µm thick) copper area for drain
connection. PCB is vertical without blown air. (see page 17)
2not subject to production test, specified by design
3VLoaddump is setup without the DUT connected to the generator per ISO 7637-1 and DIN 40839 .
Supply voltages higher than Vbb(AZ) require an external current limit for the GND pin, e.g. with a
150Ω resistor in GND connection. A resistor for the protection of the input is integrated.
BSP 742 RI
Electrical Characteristics
Load Switching Capabilities and Characteristics
Operating Parameters
BSP 742 RI
Electrical Characteristics
Protection Functions
1)
Reverse Battery

1Integrated protection functions are designed to prevent IC destruction under fault conditions
described in the data sheet. Fault conditions are considered as "outside" normal operating range.
Protection functions are not designed for continuous repetitive operation.
2 see also VON(CL) in circuit diagram on page 8
3Requires a 150 Ω resistor in GND connection. The reverse load current through the intrinsic drain-source diode has
to be limited by the connected load. Power dissipation is higher compared to normal operating conditions due to the
voltage drop across the drain-source diode. The temperature protection is not active during reverse current operation!
Input current has to be limited (see max. ratings page 3).
BSP 742 RI
Electrical Characteristics
Input and Status feedback
Diagnostic Characteristics

1no delay time after overtemperature switch off and short circuit in on-state
BSP 742 RI
*) Out ="L": VOUT < 2V typ.
**) Out ="H": VOUT > 2V typ.
BSP 742 RI
TermsInductive and overvoltage output clamp
PROFET
IN
OUT
GNDSTVINSTINbbLOUTIGNDONGND
GNDON clamped to 47V typ.
Overvoltage protection of logic partInput circuit (ESD protection)

GNDRIIIESD-
The use of ESD zener diodes as voltage clamp
at DC conditions is not recommendedZ1=6.1V typ., VZ2=Vbb(AZ)=47V typ.,I=3.5 kΩ typ., RGND=150Ω
Reverse battery protection
Status output

GND
Logic
STR
± 5V
OUTR
Power GND
GNDR
Signal GND
Power
InverseR
Vbb-
Diode
GND
ESD-
+5VST(ON)GND=150Ω, RI=3.5kΩ typ.,
Temperature protection is not active during
inverse current
BSP 742 RI
Open-load detection

OFF-state diagnostic condition: OUT > 3V typ.; IN=lowbb disconnect with charged inductive
load
PROFET
IN
OUT
GNDbb
high
Open load
detection
Logic
unitVOUT
Signal GNDL(OL)
OFF
GND disconnect
PROFET
IN
OUT
GNDbbVINVSTVGND
Inductive Load switch-off energy
dissipation
GND disconnect with GND pull up
PROFET
IN
OUT
GNDbbVGNDINVST
Energy stored in load inductance: EL = ½ * L * IL2
While demagnetizing load inductance,
the enérgy dissipated in PROFET isAS = Ebb + EL - ER = VON(CL) * iL(t) dt,
with an approximate solution for RL > 0Ω:ILVVIROUTCL
OUTCL=++**(|)*ln(*)()|21
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