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August, 27th 2009
Automotive grade
AUIPS7121R
CURRENT SENSE HIGH SIDE SWITCH
Features
* * * * * * * * * * Suitable for 24V systems Over current shutdown Over temperature shutdown Current sensing Active clamp Optimized Turn On/Off for EMI Reverse battery protection (Mosfet on) 75W Filament lamp Solenoid 24V loads for trucks
Product Summary Rds(on) 30m max. Vclamp 65V Current shutdown 50A min.
Applications Packages
Description
The AUIPS7121R is a fully protected five terminal high side switch specifically designed for driving lamp. It features current sensing, over-current, over-temperature, ESD protection and drain to source active clamp. When the input voltage Vcc - Vin is higher than the specified threshold, the output power Mosfet is turned on. When the Vcc - Vin is lower than the specified Vil threshold, the output Mosfet is turned off. The Ifb pin is used for current sensing. The over-current shutdown is higher than inrush current of the lamp.
DPak
Typical Connection
Vcc IN Ifb Current feeback Input
On Off
AUIPS7121R
Battery Out
10k Rifb Logic Ground Power Ground Load
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Subject to change without notice
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AUIPS7121R
Qualification Information
Qualification Level Automotive (per AEC-Q100) Comments: This family of ICs has passed an Automotive qualification. IR's Industrial and Consumer qualification level is granted by extension of the higher Automotive level. MSL1, 260C (per IPC/JEDEC J-STD-020) Class M2 (200 V) (per AEC-Q100-003) Class H1C (1500 V) (per AEC-Q100-002) Class C5 (1000 V) (per AEC-Q100-011) Class II, Level A (per AEC-Q100-004) Yes
Moisture Sensitivity Level
DPAK-5L
Machine Model ESD Human Body Model Charged Device Model IC Latch-Up Test RoHS Compliant
Qualification standards can be found at International Rectifier's web site http://www.irf.com/ Exceptions to AEC-Q100 requirements are noted in the qualification report.
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AUIPS7121R
Absolute Maximum Ratings
Absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. (Tambient=25C unless otherwise specified).
Symbol
Vout Vcc-Vin max. Iifb, max. Vcc sc Pd Tj max.
Parameter
Maximum output voltage Maximum Vcc voltage Maximum feedback current Maximum Vcc voltage with short circuit protection see page 7 Maximum power dissipation (internally limited by thermal protection) Rth=50C/W DPack 6cm footprint Max. storage & operating junction temperature
Min.
Max.
Units
V V mA V W C
Vcc-60 Vcc+0.3 -32 60 -50 10 50
-40
2.5 150
Thermal Characteristics
Symbol
Rth1 Rth2 Rth3
Parameter
Thermal resistance junction to ambient DPak Std footprint Thermal resistance junction to ambient Dpak 6cm footprint Thermal resistance junction to case Dpak
Typ.
70 50 2
Max.

Units
C/W
Recommended Operating Conditions
These values are given for a quick design.
Symbol
Iout Rifb
Parameter
Continuous output current, Tambient=85C, Tj=125C Rth=50C/W, Dpak 6cm footprint Ifb resistor
Min.
Max.
3.8
Units
A k
1.5
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AUIPS7121R
Static Electrical Characteristics
Tj=25C, Vcc=28V (unless otherwise specified)
Symbol
Vcc op. Rds(on)
Parameter
Min.
Typ.
Max.
Units
V m A mA V m V
Test Conditions
Ids=2A Vin=Vcc=28V,Vifb=Vgnd Vout=Vgnd Vcc-Vin=28V Id=10mA Id=20A see fig. 2 Id=10mA Isd=2A If=3A
60 Operating voltage range 6 24 30 ON state resistance Tj=25C ON state resistance Tj=150C(2) 45 55 2 4 Icc off Supply leakage current Iout off Output leakage current 2 4 Iin on Input current when device on 1 2.5 4 V clamp1 Vcc to Vout clamp voltage 1 60 64 V clamp2 Vcc to Vout clamp voltage 2 60 65 72 3.5 5.9 Vih(1) High level Input threshold voltage Vil(1) Low level Input threshold voltage 1.5 3.2 Rds(on) rev Reverse On state resistance Tj=25C 25 40 Vf Forward body diode voltage Tj=25C 0.75 0.85 Forward body diode voltage Tj=125C 0.62 0.7 Rin Input resistor 180 250 350 (1) Input thresholds are measured directly between the input pin and the tab.
Switching Electrical Characteristics
Vcc=28V, Resistive load=6.8, Tj=25C
Symbol
tdon tr tdoff tf
Parameter
Turn on delay time Rise time from 20% to 80% of Vcc Turn off delay time Fall time from 80% to 20% of Vcc
Min.
6 5 25 6
Typ.
15 10 50 15
Max.
30 30 100 30
Units
s
Test Conditions
See fig. 1
s
Protection Characteristics
Tj=25C, Vcc=28V (unless otherwise specified)
Symbol
Tsd Isd I fault
Parameter
Over temperature threshold(2) Over-current shutdown Ifb after an over-current or an overtemperature (latched)
Min.
150 50 2.7
Typ.
165 60 3.3
Max.
Units
C A mA
Test Conditions
See fig. 3 and fig. 11 See fig. 3 and page 7 See fig. 3
80 4
Current Sensing Characteristics
Tj=25C, Vcc=28V (unless otherwise specified), Vcc-Vifb>4V
Symbol
Parameter
Min.
7050 -5% -0.6 0
Typ.
8500 0 0 10
Max.
9950 +5 0.6 100
Units
% A A
Test Conditions
Iload=5A Tj=-40C to +150C Iout<5A Iout=0A
Ratio I load / Ifb current ratio Ratio_TC I load / Ifb variation over temperature(2) I offset Load current offset Ifb leakage Ifb leakage current (2) Guaranteed by design
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AUIPS7121R
Lead Assignments
3- Vcc
1- NC 2- In 3- Vcc 4- Ifb 5- Out
12
45
DPak
Functional Block Diagram
All values are typical
VCC
3V 75V 1.5mA
Charge Pump
60V
75V
+ -
Driver
75V
Reset Set
Latch
Q
Reverse Battery Protection Diag
+
Iout > 60A 250
Tj > 165C
IN
IFB OUT
5
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AUIPS7121R
Truth Table
Op. Conditions Normal mode Normal mode Open load Open load Short circuit to GND Short circuit to GND Over temperature Over temperature Input H L H L H L H L Output L H L H L L L L Ifb pin voltage 0V I load x Rfb / Ratio 0V Ifb leakage x Rifb 0V I fault x Rifb(latched) 0V I fault x Rifb (latched)
Operating voltage
Maximum Vcc voltage : this is the maximum voltage before the breakdown of the IC process. Operating voltage : This is the Vcc range in which the functionality of the part is guaranteed. The AEC-Q100 qualification is run at the maximum operating voltage specified in the datasheet.
Reverse battery
During the reverse battery the Mosfet is turned on if the input pin is powered with a diode in parallel of the input transistor. Power dissipation in the IPS : P = Rdson rev * I load + Vcc / 250 ( internal input resistor ). If the power dissipation is too high in Rifb, a diode in serial can be added to block the current.
Active clamp
The purpose of the active clamp is to limit the voltage across the MOSFET to a value below the body diode break down voltage to reduce the amount of stress on the device during switching. The temperature increase during active clamp can be estimated as follows:
Tj = PCL Z TH ( t CLAMP )
Where: Z TH ( t CLAMP ) is the thermal impedance at tCLAMP and can be read from the thermal impedance curves given in the data sheets.
PCL = VCL ICLavg : Power dissipation during active clamp
VCL = 65V : Typical VCLAMP value
ICLavg = ICL : Average current during active clamp 2
t CL =
di = dt
ICL : Active clamp duration di dt VBattery - VCL : Demagnetization current
L
Figure 9 gives the maximum inductance versus the load current in the worst case : the part switches off after an over temperature detection. If the load inductance exceeds the curve, a free wheeling diode is required.
Over-current protection
The threshold of the over-current protection is set in order to guarantee that the device is able to turn on a load with an inrush current lower than the minimum of Isd. Nevertheless for high current and high temperature the device may switch off for a lower current due to the over-temperature protection. This behavior is shown in Figure 11.
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AUIPS7121R
Current sensing accuracy
Ifb
Ifb2
Ifb1 Ifb leakage
I offset
Iout1
Iout2
Iout
The current sensing is specified by measuring 3 points : - Ifb1 for Iout1 - Ifb2 for Iout2 - Ifb leakage for Iout=0 The parameters in the datasheet are computed with the following formula : Ratio = ( Iout2 - Iout1 )/( Ifb2 - Ifb1) I offset = Ifb1 x Ratio - Iout1 This allows the designer to evaluate the Ifb for any Iout value using : Ifb = ( Iout + I offset ) / Ratio if Ifb > Ifb leakage For some applications, a calibration is required. In that case, the accuracy of the system will depends on the variation of the I offset and the ratio over the temperature range. The ratio variation is given by Ratio_TC specified in page 4. The Ioffset variation depends directly on the Rdson : I offset@-40C= I offset@25C / 0.8 I offset@150C= I offset@25C / 1.9
Maximum Vcc voltage with short circuit protection
The maximum Vcc voltage with short circuit is the maximum voltage for which the part is able to protect itself under test conditions representative of the application. 2 kind of short circuits are considered : terminal and load short circuit.
L supply 5H
R supply 10mohm
Vcc
IPS Out
L SC R SC
Terminal SC Load SC
L SC 0.1 H 10 H
R SC 10 mohm 100 mohm
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AUIPS7121R
80%
T clamp
Vcc-Vin
Vcc-Vin
20%
Ids
80%
Vout
20%
Vcc
Td on Tr
Td off Tf
Vds
Vds clamp
See Application Notes to evaluate power dissipation
Figure 1 - IN rise time & switching definitions
Figure 2 - Active clamp waveforms
25
Vin Ids
I shutdown
Icc off, supply leakage current (A)
20
15
10
Tj
Tsd 165C V fault
Tshutdown
5
Vifb
0 -50 0 50 100 150
Tj, junction temperature (C) Figure 3 - Protection timing diagram Figure 4 - Icc off (A) Vs Tj (C)
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AUIPS7121R
4
6
VIH
5
Iccoff, supply current (A)
VIL
4
Vih and Vil (V)
2
3 2 1
0 0 10 20 30 40 50
0 -50 -25 0 25 50 75 100 125 150
Vcc-Vin, supply voltage (V) Figure 5 - Icc off(A) Vs Vcc-Vin (V)
Tj, junction temperature (C) Figure 6 - Vih and Vil (V) Vs Tj (C)
200%
100.00
Rds(on), Drain-to-Source On Resistance (Normalized)
150%
Zth, transient thermal impedance (C/W)
10.00
1.00
100%
0.10
50% -50 0 50 100 150
0.01 1.E05
1.E04
1.E03
1.E02
1.E- 1.E+0 1.E+0 1.E+0 01 0 1 2
Tj, junction temperature (C) Figure 7 - Normalized Rds(on) (%) Vs Tj (C)
Time (s) Figure 8 - Transient thermal impedance (C/W) Vs time (s)
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AUIPS7121R
100
1.4
Ifb, current feedback current (mA)
1.2
25C
1.0 0.8
Max. output current (A)
10
150C
0.6 0.4 0.2 0.0 0 2 4 6 8 10
1 1.E+01 1.E+02 1.E+03 1.E+04
Inductance (H) Figure 9 - Max. Iout (A) Vs inductance (H)
Iout, output current (A) Figure 10 - Ifb (mA) Vs Iout (A)
100 10
Tsd, time to shutdown(s)
1 0.1 0.01
'-40C
0.001 0.0001 0 10 20 30 40 50
'+25C '+125C
Iout, output current (A) Figure 11 - Tsd (s) Vs I out (A) SMD with 6cm
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AUIPS7121R
Case Outline 5 Lead - DPAK
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11
AUIPS7121R
Tape & Reel
5 Lead - DPAK
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AUIPS7121R
Part Marking Information
Ordering Information
Base Part Number Standard Pack Package Type Form Tube AUIPS7121R D-Pak-5-Lead Tape and reel Tape and reel left Tape and reel right Quantity 75 3000 2000 2000 AUIPS7121R AUIPS7121RTR AUIPS7121RTRL AUIPS7121RTRR Complete Part Number
The information provided in this document is believed to be accurate and reliable. However, International Rectifier assumes no responsibility for the consequences of the use of this information. International Rectifier assumes no responsibility for any infringement of patents or of other rights of third parties which may result from the use of this information. No license is granted by implication or otherwise under any patent or patent rights of International Rectifier. The specifications mentioned in this document are subject to change without notice. This document supersedes and replaces all information previously supplied.
For technical support, please contact IR's Technical Assistance Center http://www.irf.com/technical-info/ WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245 Tel: (310) 252-7105
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