Data Sheet No. PD60192 revG
IMPORTANT NOTICE:
IR2171/IR2172 (S)
For new designs we recommend IR’s new products
IR2175, IR2177, IR21771, IR2277
or
IR22771.
LINEAR CURRENT SENSING IC
Features
•
•
•
•
•
•
•
•
Floating channel up to +600V
Monolithic integration
Linear current feedback through shunt resistor
Direct digital PWM output for easy interface
Low I
QBS
allows the boot strap power supply
Independent fast overcurrent trip signal
High common mode noise immunity
Input overvoltage protection for IGBT short circuit
condition
Product Summary
VOFFSET
IQBS
Vin
Gain temp.drift
fo
Overcurrent trip
signal delay (IR2172)
Overcurrent trip level
600Vmax
1mA
+/-260mVmax
20ppm/oC (typ.)
40kHz (typ.)
1.5usec (typ)
+/-260mV (typ.)
•
Open Drain outputs
Description
IR2171/IR2172 are 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 iso-
lation technology is implemented to enable the high
bandwidth signal processing. The output format is dis-
crete PWM to eliminate need for the A/D input interface
for the IR2172. The dedicated overcurrent trip (OC) sig-
nal facilitates IGBT short circuit protection. The open-
drain outputs make easy for any interface from 3.3V to
15V.
Packages
8-Lead SOIC
8-Lead PDIP
Block Diagram
15V
PWM Output
GND
Overcurrent
VCC
PO
V+
Up to 600V
IR2171/
V-
COM
IR2172
VB
NC (OC 2172)
VS
To Motor Phase
(Refer to Lead Assignments for correct pin
configuration). This/These diagram(s)
show electrical connections only. Please
refer to our Application Notes and
DesignTips for proper circuit board layout.
IR2171/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
V
S
V
BS
V
CC
V
IN
V
PO
V
OC
V
IN-
dV/dt
P
D
Rth
JA
T
J
T
S
T
L
Definition
High side offset voltage
High side floating supply voltage
Low side and logic fixed supply voltage
Maximum input voltage between V
IN+ and
V
IN-
Digital PWM output voltage
Overcurrent output voltage (IR2172)
V
IN-
input voltage (note 1)
Allowable offset voltage slew rate
Package power dissipation @ T
A
≤
+25°C
Thermal resistance, junction to ambient
Junction temperature
Storage temperature
Lead temperature (soldering, 10 seconds)
8 lead SOIC
8 lead PDIP
8 lead SOIC
8 lead PDIP
Min.
-0.3
-0.3
-0.3
-5
COM -0.3
COM -0.3
V
S
-5
—
—
—
—
—
—
-55
—
Max.
600
25
25
5
VCC +0.3
VCC +0.3
V
B+
0.3
50
.625
1.0
200
125
150
150
300
Units
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 recom-
mended conditions.
Symbol
V
B
V
S
V
PO
V
OC
V
CC
V
IN
T
A
Definition
High side floating supply voltage
High side floating supply offset voltage
Digital PWM output voltage
Overcurrent output voltage
Low side and logic fixed supply voltage
Input voltage between V
IN+
and V
IN-
Ambient temperature
Min.
V
S
+13.0
0.3
COM
COM
9.5
-260
-40
Max.
V
S
+20
600
VCC
VCC
20
+260
125
Units
V
mV
°C
2
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IR2171/IR2172
DC Electrical Characteristics
o
Symbol
V
IN
V
OC+
V
OC-
V
OS
∆
V
OS
/
∆
T
A
G
∆
G
/
∆
T
A
I
LK
I
QBS
I
QCC
LIN
∆
V
LIN
/
∆
T
A
I
OPO
I
OCC
V
CC
= V
BS
= 15V, and T
A
= 25 C unless otherwise specified.
Definition
Nominal input voltage range before saturation
|V
IN+ _
V
IN-
|
Overcurrent trip positive input voltage
Overcurrent trip negative input voltage
Input offset voltage
Input offset voltage temperature drift
Gain (duty cycle % per V
IN
)
Gain temperature drift
Offset supply leakage current
Quiescent V
BS
supply current
Quiescent V
CC
supply current
Linearity (duty cycle deviation from ideal linearity
curve)
Linearity temperature drift
Digital PWM output sink current
OC output sink current (IR2172)
Min. Typ. Max. Units Test Conditions
-260
—
—
-10
—
157
—
—
—
—
—
—
20
2
10
1
—
260
—
—
10
—
167
—
50
2
0.5
1
—
—
—
—
—
mA
µV/
o
C
%/V
ppm/
o
C
µA
mA
%
%/
o
C
V
O
= 1V
V
O
= 0.1V
V
O
= 1V
V
O
= 0.1V
V
B
= V
S
= 600V
V
S
= 0V
max gain error=5%
(Note 2)
20
—
1
—
0.5
.005
—
—
—
—
V
IN
= 0V (Note 1)
mV
260
-260
0
25
162
Note 1:
±10mV
offset represents
±1.5%
duty cycle fluctuation
Note 2: Gain = (full range of duty cycle in %) / (full input voltage range).
V
CC
= V
BS
= 15V, and T
A
= 25 C unless otherwise specified.
AC Electrical Characteristics
o
Symbol
Definition
Propagation delay characteristics
fo
∆
f
/
∆
T
A
Dmin
Dmax
BW
PHS
tdoc
twoc
Carrier frequency output
Min. Typ. Max. Units Test Conditions
35
—
—
—
41
500
7
93
15
-10
1
—
1.5
1
—
—
47
—
—
—
kHz
ppm/ C
%
%
kHz
o
o
Temperature drift of carrier frequency
Minimum duty
Maximum duty
fo bandwidth
Phase shift at 1kHz
Propagation delay time of OC (IR2172)
Low true pulse width of OC (IR2172)
figure 1
V
IN
= 0 & 5V
VIN+=-260mV,VIN-=0V
VIN+=+260mV,VIN-=0V
V
IN+ = 100mVpk -pk
sine wave, gain=-3dB
V
IN
+ =100mVpk-pk
sine wave
µsec
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3
IR2171/IR2172
Timing Waveforms
PO
Duty=7%
Vin+= -260mV
Vin- = 0V
Duty=93%
PO
Vin+= +260mV
Vin- = 0V
Carrier Frequency =
40kHz
Figure 1 Output waveform
+260mV
Vin
-260mV
OC
t
woc
t
doc
Figure 2. OC Waveform (2172 only)
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.
4
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IR2171/IR2172
Lead Definitions
Symbol Description
V
CC
COM
V
IN+
V
IN-
V
B
V
S
PO
OC
N.C.
Low side and logic supply voltage
Low side logic ground
Positive sense input
Negative sense input
High side supply
High side return
Digital PWM output
Overcurrent output (negative logic) (IR2172 only)
No connection
Lead Assignment
1
VCC
VIN+
8
1
VCC
VIN+
8
2
PO
8 lead SOIC
VIN-
7
2
PO
8 lead PDIP
VIN-
7
IR2171S
3
IR2171
VB
6
3
COM
COM
VB
6
4
NC
VS
5
4
NC
VS
5
1
VCC
VIN+
8
1
VCC
VIN+
8
2
PO
8 lead SOIC
VIN-
7
2
PO
8 lead PDIP
VIN-
7
IR2172S
3
IR2172
VB
6
3
COM
COM
VB
6
4
OC
VS
5
4
OC
VS
5
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5
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