IRF IR2172S

ADVANCE INFORMATION
Data Sheet No. PD60176-C
IR2172
LINEAR CURRENT SENSING IC
Features
•
•
•
•
•
•
•
•
Product Summary
Floating channel up to +600V
Monolithic integration
Linear current feedback through shunt resistor
Direct digital PWM output for easy interface
Low IQBS allows the boot strap power supply
Independent fast overcurrent trip signal
High common mode noise immunity
Input overvoltage protection for IGBT short circuit
condition
• Open Drain outputs
Description
VOFFSET
600Vmax
IQBS
1mA
Vin
+/-260mVmax
Gain temp.drift
fo
40kHz (typ.)
Overcurrent trip
signal delay
1.5usec (typ)
Overcurrent trip level
IR2172 is the monolithic current sensing IC designed
for motor drive applications. It senses the motor phase
current through an external shunt resistor, converts from
analog to digital signal, and transfers the signal to the
low side. IR’s proprietary high voltage isolation technology is implemented to enable the high bandwidth signal
processing. The output format is discrete PWM to eliminate need for the A/D input interface. The dedicated
overcurrent trip (OC) signal facilitates IGBT short circuit protection. The OC output pulse can be programmed
by the external resistor and capacitor. The open-drain
outputs make easy for any interface from 3.3V to 15V.
Block Diagram
15V
PWM Output
20ppm/oC (typ.)
+/-260mV (typ.)
Packages
8 Lead SOIC
8 Lead PDIP
16 Lead SOIC
(wide body)
Up to 600V
V+
VCC
V-
PO
IR2172
GND
Overcurrent
COM
VB
OC
VS
To Motor Phase
ADVANCE INFORMATION
IR2172
Absolute Maximum Ratings
Absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. All voltage
parameters are absolute voltages referenced to COM, all currents are defined positive into any lead. The thermal
resistance and power dissipation ratings are measured under board mounted and still air conditions.
Symbol
Definition
Min.
Max.
Units
VS
High side offset voltage
-0.3
600
VBS
High side floating supply voltage
-0.3
25
VCC
Low side and logic fixed supply voltage
-0.3
25
VIN
Maximum input voltage between VIN+ and VIN-
-5
5
VPO
Digital PWM output voltage
COM -0.3
VCC +0.3
VOC
Overcurrent output voltage
COM -0.3
VCC +0.3
VIN-
VIN- input voltage (note 1)
VS -5
VB+ 0.3
dV/dt
Allowable offset voltage slew rate
—
50
8 lead SOIC
—
.625
8 lead PDIP
—
1.0
16 lead SOIC
—
1.25
PD
RthJA
Package power dissipation @ TA ≤ +25°C
Thermal resistance, junction to ambient
8 lead SOIC
—
200
8 lead PDIP
—
125
16 lead SOIC
—
100
TJ
Junction temperature
—
150
TS
Storage temperature
-55
150
TL
Lead temperature (soldering, 10 seconds)
—
300
V
V/ns
W
°C/W
°C
Note 1: Capacitors are required between VB and Vin-, and between VB and Vs pins when bootstrap power
is used. The external power supply, when used, is required between Vs and Vin-, and between VB and Vs
pins.
Recommended Operating Conditions
The output logic timing diagram is shown in figure 1. For proper operation the device should be used within the recommended conditions.
Symbol
Definition
Min.
Max.
VS +13.0
VS +20
Units
VB
High side floating supply voltage
VS
High side floating supply offset voltage
note 2
600
VPO
Digital PWM output voltage
COM
VCC
VOC
Overcurrent output voltage
COM
VCC
VCC
Low side and logic fixed supply voltage
9.5
20
VIN
Input voltage between VIN+ and VIN-
-260
+260
mV
TA
Ambient temperature
-40
125
°C
V
Note 2: Logic operation for Vs of -5 to +600V. Logic state held for Vs of -5V to -VBS.
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ADVANCE INFORMATION
IR2172
DC Electrical Characteristics
VCC = VBS = 15V, unless otherwise specified.
Symbol
Definition
VIN
Nominal input voltage range before saturation
Min. Typ. Max. Units Test Conditions
-260
—
260
—
—
|VIN+ _ VIN-|
VOC+
Overcurrent trip positive input voltage
mV
VOC-
Overcurrent trip negative input voltage
—
260
-260
VOS
Input offset voltage
-10
0
10
Input offset voltage temperature drift
—
25
—
µV/oC
157
162
167
%/V
—
20
—
ppm/oC
µA
∆VOS/ ∆TA
G
Gain (duty cycle % per VIN)
—
VIN = 0V (Note 1)
max gain error=5%
(Note 2)
∆G / ∆TA
Gain temperature drift
ILK
Offset supply leakage current
—
—
50
IQBS
Quiescent VBS supply current
—
1
2
mA
IQCC
Quiescent VCC supply current
—
—
1
LIN
Linearity (duty cycle deviation from ideal linearity
—
0.5
1
%
Linearity temperature drift
—
.005
—
%/ oC
Digital PWM output sink current
20
—
—
2
—
—
10
—
—
1
—
—
VB = VS = 600V
VS = 0V
curve)
∆VLIN/∆TA
IOPO
IOCC
OC output sink current
VO = 1V
mA
VO = 0.1V
VO = 1V
VO = 0.1V
Note 1: ±10mV offset represents ±1.5% duty cycle fluctuation
Note 2: Gain = (full range of duty cycle in %) / (full input voltage range).
AC Electrical Characteristics
VCC = VBS = 15V, unless otherwise specified.
Symbol
Definition
Propagation delay characteristics
fo
Min. Typ. Max. Units Test Conditions
Carrier frequency output
—
40
—
kHz
Temperature drift of carrier frequency
—
500
—
ppm/oC
figure 1
VIN = 0 & 5V
Dmin
Minimum duty
—
7
—
%
VIN+=-260mV,VIN-=0V
Dmax
Maximum duty
—
93
—
∆f/∆TA
%
VIN+=+260mV,VIN-=0V
BW
fo bandwidth
15
kHz
VIN+ = 100mVpk -pk
sine wave, gain=-3dB
PHS
Phase shift at 1kHz
-10
o
VIN+ =100mVpk-pk
sine wave
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ADVANCE INFORMATION
IR2172
AC Electrical Characteristics cont.
VCC = VBS = 15V, unless otherwise specified.
Symbol
Definition
Proagation delay characteristics
Min. Typ. Max. Units Test Conditions
tdoc
Propagation delay time of OC
1
1.5
—
twoc
Low true pulse width of OC
—
1
—
Timing Waveforms
µsec
Duty=7%
Vin+= -260mV
Vin- = 0V
PO
Duty=93%
Vin+= +260mV
Vin- = 0V
PO
Carrier Frequency =
40kHz
Figure 1 Output waveform
Application Hint:
Temperature drift of the output carrier frequency can be cancelled by measuring both a PWM period and
the on-time of PWM (Duty) at the same time. Since both periods vary in the same direction, computing the
ratio between these values at each PWM period gives consistent measurement of the current feedback
over the temperature drift.
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ADVANCE INFORMATION
IR2172
Lead Definitions
Symbol Description
VCC
Low side and logic supply voltage
COM
Low side logic ground
VIN+
Positive sense input
VIN-
Negative sense input
VB
High side supply
VS
High side return
PO
Digital PWM output
OC
N.C.
Overcurrent output (negative logic)
No connection
Lead Assignment
1
VCC
VIN+
8
1
VCC
VIN+
8
2
PO
VIN-
7
2
PO
VIN-
7
3
COM
VB
6
3
COM
VB
6
4
OC
VS
8 lead SOIC
IR2172S
5
4
OC
VS
1
NC
NC
16
2
NC
NC
15
3
VCC
VIN+
14
4
PO
VIN-
13
5
COM
VB
12
6
OC
VS
11
7
NC
NC
10
8
NC
NC
9
5
8 lead PDIP
IR2172
16 lead SOIC
IR21726S
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IR2172
ADVANCE INFORMATION
Case Outline - 8 Lead SOIC
(MS-012AA) 01-0021 09
8 Lead PDIP
6
01-3003 01
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ADVANCE INFORMATION
16 Lead SOIC (wide body)
IR2172
01-3014 03
IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245 Tel: (310) 252-7105
IR EUROPEAN REGIONAL CENTRE: 439/445 Godstone Rd., Whyteleafe, Surrey CR3 0BL, United Kingdom
Tel: ++ 44 (0) 20 8645 8000
Data and specifications subject to change without notice. 6/20/2000
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