ADVANCE INFORMATION
Data Sheet No. PD60176-C
IR2172
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
V
OFFSET
I
QBS
Vin
Gain temp.drift
fo
Overcurrent trip
signal delay
Overcurrent trip level
600Vmax
1mA
+/-260mVmax
20ppm/
o
C (typ.)
40kHz (typ.)
1.5usec (typ)
+/-260mV (typ.)
•
Open Drain outputs
Description
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 technol-
ogy is implemented to enable the high bandwidth signal
processing. The output format is discrete PWM to elimi-
nate need for the A/D input interface. The dedicated
overcurrent trip (OC) signal facilitates IGBT short cir-
cuit 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.
Packages
8 Lead SOIC
8 Lead PDIP
16 Lead SOIC
(wide body)
Block Diagram
15V
PWM Output
GND
Overcurrent
VCC
PO
V+
V-
Up to 600V
IR2172
COM
OC
VB
VS
To Motor Phase
IR2172
ADVANCE INFORMATION
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
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
V
IN-
input voltage (note 1)
Allowable offset voltage slew rate
Package power dissipation @ T
A
≤
+25°C
8 lead SOIC
8 lead PDIP
16 lead SOIC
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
1.25
200
125
100
150
150
300
Units
V
V/ns
W
Rth
JA
Thermal resistance, junction to ambient
8 lead SOIC
8 lead PDIP
16 lead SOIC
°C/W
T
J
T
S
T
L
Junction temperature
Storage temperature
Lead temperature (soldering, 10 seconds)
°C
Note 1: Capacitors are required between V
B
and Vin-, and between V
B
and Vs pins when bootstrap power
is used. The external power supply, when used, is required between Vs and Vin-, and between V
B
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
note 2
COM
COM
9.5
-260
-40
Max.
V
S
+20
600
VCC
VCC
20
+260
125
Units
V
mV
°C
Note 2: Logic operation for Vs of -5 to +600V. Logic state held for Vs of -5V to -V
BS
.
2
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ADVANCE INFORMATION
IR2172
DC Electrical Characteristics
V
CC
= V
BS
= 15V, unless otherwise specified.
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
IN+ _
V
IN-
|
Definition
Nominal input voltage range before saturation
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
Min. Typ. Max. Units Test Conditions
-260
—
—
-10
—
157
—
—
—
—
—
—
20
2
10
1
—
260
—
—
10
—
167
—
50
2
1
1
—
—
—
—
—
mA
µV/
o
C
%/V
ppm/ 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
o
260
-260
0
25
162
20
—
1
—
0.5
.005
—
—
—
—
mV
V
IN
= 0V (Note 1)
max gain error=5%
(Note 2)
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
V
CC
= V
BS
= 15V, unless otherwise specified.
Symbol
Definition
Propagation delay characteristics
fo
∆
f
/
∆
T
A
Dmin
Dmax
BW
PHS
Carrier frequency output
Temperature drift of carrier frequency
Minimum duty
Maximum duty
fo bandwidth
Phase shift at 1kHz
Min. Typ. Max. Units Test Conditions
—
—
—
—
40
500
7
93
15
-10
—
—
—
—
kHz
ppm/ C
%
%
kHz
o
o
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
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IR2172
ADVANCE INFORMATION
AC Electrical Characteristics cont.
V
CC
= V
BS
= 15V, unless otherwise specified.
Symbol
Definition
Proagation delay characteristics
tdoc
twoc
Propagation delay time of OC
Low true pulse width of OC
Min. Typ. Max. Units Test Conditions
1
—
1.5
1
—
—
µsec
Timing Waveforms
PO
Duty=7%
Vin+= -260mV
Vin- = 0V
Duty=93%
PO
Vin+= +260mV
Vin- = 0V
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.
4
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ADVANCE INFORMATION
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)
No connection
Lead Assignment
1
VCC
VIN+
8
1
VCC
VIN+
8
1
NC
NC
16
2
2
PO
VIN-
7
2
PO
VIN-
NC
NC
15
7
3
3
VCC
VIN+
14
COM
VB
6
3
COM
VB
6
4
PO
VIN-
13
4
OC
VS
5
4
OC
VS
5
5
COM
VB
12
6
OC
VS
11
8 lead SOIC
8 lead PDIP
IR2172S
IR2172
7
NC
NC
10
8
NC
NC
9
16 lead SOIC
IR21726S
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