Semiconductor Components Industries, LLC, 2001
March, 2001 Rev. 4
1
Publication Order Number:
CS8312/D
CS8312
IGBT Ignition Predriver with
Dynamic Current Regulation
The CS8312 is a bipolar microprocessor interface IC designed to
drive an IGBT (or logic level MOSFETs) powering large inductive
loads in harsh operating environments. The IC's dynamic current
limit function lets the microprocessor adjust the current limit threshold
to the real time needs of the system.
CLI, the current limit input, sets the current limit for the IGBT high
or low as directed by the system microprocessor. CLI also raises and
lowers the threshold on the diagnostic FLAG output signal. The
FLAG output signals the microprocessor when the current level
approaches current limit on the IGBT. The CTRL input enables the
FLAG function.
Features
P Compatible Inputs
Adjustable Current Limit Thresholds
External Sense Resistor
Flag Signal to Indicate Output Status
Figure 1. Block Diagram
CTRL
FLAG
OUT
SENSE+
V
CC
SENSE
CLI
GND
Control
Logic
Latch
V
REF
Gate
Driver
V
T
V
T
5.0 V
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A
= Assembly Location
WL, L
= Wafer Lot
YY, Y
= Year
WW, W = Work Week
MARKING
DIAGRAMS
DIP8
N SUFFIX
CASE 626
1
8
Device
Package
Shipping
ORDERING INFORMATION
CS8312YN8
DIP8
50 Units/Rail
1
8
CS8312YN8
AWL
YYWW
OUT
GND
CLI
SENSE
CTRL
SENSE+
V
CC
FLAG
1
PIN CONNECTIONS
SO8
D SUFFIX
CASE 751
1
CS831
ALYW2
8
1
8
CS8312YD8
SO8
95 Units/Rail
CS8312YDR8
SO8
2500 Tape & Reel
CS8312
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2
ABSOLUTE MAXIMUM RATINGS*
Rating
Value
Unit
Supply Voltage
0.3 to 12
V
Digital Input Currents
2.0
mA
Internal Power Dissipation (T
A
= 25
C)
700
mW
Junction Temperature Range
40 to +150
C
Storage Temperature Range
55 to +165
C
Electrostatic Discharge (Human Body Model)
2.0
kV
Lead Temperature Soldering
Wave Solder (through hole styles only) Note 1.
Reflow (SMD styles only) Note 2.
260 peak
230 peak
C
C
1. 10 seconds max.
2. 60 seconds max above 183
C
*The maximum package power dissipation must be observed.
ELECTRICAL CHARACTERISTICS
(7.0 V
V
CC
10 V, 40
C
T
A
125
C,
0.2 V
Differential Ground Voltage
0.8 V; unless otherwise specified.)
Characteristic
Test Conditions
Min
Typ
Max
Unit
General
Power Supply Including Ripple Voltage
7.0
10
V
Supply Ripple Frequency
10
60
kHz
Differential Ground Frequency
10
60
kHz
Quiescent Current, I
Q
Turn On
Turn Off
V
CTRL
= 5.5 V
V
CTRL
= 0.3 V
15
5.0
mA
mA
Supply Voltage Rejection
V
CTRL
= 5.5 V
30
dB
Differential Ground Rejection Ratio
V
CTRL
= 5.5 V
30
dB
Differential Ground Current Ratio
V
CTRL
= 0.3 V,
(V
SENSE
V
GND
)DC = 1.0 V
(V
SENSE
V
GND
)AC = 0.6 V
3.0
mA
Unity Gain Bandwidth
V
CTRL
= 5.5 V
400
kHz
Turn On Delay
CTRL Increasing
30
s
Turn Off Delay
CTRL Decreasing
30
s
Control Function
Input Voltage Range
I
CTRL
= 2.0 mA
0.3
5.5
V
Input Threshold
Turn On
Turn Off
Hysteresis
CTRL Increasing
CTRL Decreasing
1.5
0.4
3.5
2.0
V
V
V
Voltage
I
CTRL
= 10
A max
1.1
V
Input Capacitance
50
pF
Current Limit Increase Function
Input Voltage Range
I
CTRL
= 2.0 mA
0.3
5.5
V
Input Threshold
Turn On
Turn Off
Hysteresis
CLI Increasing
CLI Decreasing
1.5
0.4
3.5
2.0
V
V
V
Voltage
I
CLI
= 10
A max
1.1
V
CS8312
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3
ELECTRICAL CHARACTERISTICS (continued)
(7.0 V
V
CC
10 V, 40
C
T
A
125
C,
0.2 V
Differential Ground Voltage
0.8 V; unless otherwise specified.)
Characteristic
Unit
Max
Typ
Min
Test Conditions
Current Limit Increase Function (continued)
Input Capacitance
50
pF
Output Stage
I
OUT
5.0
mA
Clamp Voltage
V
CTRL
= 5.5 V, I
OUT
= 1.0 mA
4.0
5.5
V
Output Off Voltage
V
CTRL
= 0.3 V, I
OUT
= 10
A
V
CTRL
= 0.3 V, I
OUT
= 200
A
0.5
1.2
V
V
Flag Function
Output Low
V
CTRL
= 5.5 V, I
FLAG
= 1.5 mA
0.9
V
Leakage Current
V
CTRL
= 0.3 V
10
A
Output Capacitance
50
pF
Turn On (V
SENSE+
V
SENSE
)
V
CTRL
= 5.5 V, V
CLI
= 0.3 V
V
CTRL
= 5.5 V, V
CLI
= 5.5 V
210
300
225
240
350
mV
mV
Turn Off Delay
CTRL Decreasing
10
s
Turn On Delay
10
s
Disable Time
100
450
s
Sense Function
Input Voltage Range
0.3
2.5
V
Sense Regulation Voltage
V
CTRL
= 5.5 V, V
CLI
= 0.3 V
V
CTRL
= 5.5 V, V
CLI
= 5.5 V
270
380
295
410
320
440
mV
mV
Input Leakage Current
V
CTRL
= 5.5 V
5.0
A
Propagation Delay
V
CTRL
= 5.5 V
20
s
PACKAGE PIN DESCRIPTION
PACKAGE PIN #
DIP8
SO8
PIN SYMBOL
FUNCTION
1
1
FLAG
Indicates whether current through the IGBT has reached a pre-
set level.
2
2
SENSE+
Positive input to current comparator.
3
3
SENSE
Ground (SENSE) for current sense resistor.
4
4
GND
Ground connection.
5
5
OUT
Output voltage to IGBT (MOSFET) gate.
6
6
CLI
Current limit input increase.
7
7
CTRL
Control input.
8
8
V
CC
Supply voltage.
CS8312
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4
CIRCUIT DESCRIPTION
Flag Function (See Figure 2)
The flag indicates when the voltage across the two sense
pins is approaching a current limit level that has been
determined by the value of the external sense resistor
(R
SENSE
) and the state of the CTRL and CLI pins. If the
voltage across the sense pins (SENSE+, SENSE) is less
than the flag turnon voltage, then the FLAG is off. When
the voltage between the sense pins equals the FLAG turn on
voltage, the FLAG will latch on until the CTRL pin goes
low. FLAG is disabled whenever CTRL is low. Changing the
CLI pin from low to high will increase nominal FLAG turn
on voltage by approximately 45%.
Table 1. FLAG Timing Sequence
State
CONTROL
SENSE+
FLAG
0
Low
X
OFF
1
High
Below Threshold
OFF
2
High
Above Threshold
ON
3
High
X
ON
0
Low
X
OFF
Output Stage
The CS8312 output (OUT) saturates and supplies voltage
to the IGBT (or MOSFET) gate once the CTRL switches
from low to high. As current through the IGBT (MOSFET)
increases and the voltage across the sense resistor passes the
flag turn on voltage, the FLAG will turn on. If the current
through the sense resistor continues to rise and the sense
resistor voltage reaches the regulation sense voltage, then
the gate voltage will fall to a level that regulates the driver
and maintains the regulation sense voltage at the sense
resistor.
Current Limit Function
Changing the CLI pin from a logic low to a logic high
increases the FLAG turn on voltage by approximately 45%
and the regulation sense voltage by approximately 39%
respectively.
Figure 2. Application and Test Diagram
FLAG
CTRL
CLI
OUT
SENSE+
SENSE
GND
V
CC
CS8312
Microprocessor
V
CC
R
V
CC
V
BAT
LOAD
R
SENSE
0.1
F
CS8312
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5
PACKAGE DIMENSIONS
DIP8
N SUFFIX
CASE 62605
ISSUE L
NOTES:
1. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
2. PACKAGE CONTOUR OPTIONAL (ROUND OR
SQUARE CORNERS).
3. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
1
4
5
8
F
NOTE 2
A
B
T
SEATING
PLANE
H
J
G
D
K
N
C
L
M
M
A
M
0.13 (0.005)
B
M
T
DIM
MIN
MAX
MIN
MAX
INCHES
MILLIMETERS
A
9.40
10.16
0.370
0.400
B
6.10
6.60
0.240
0.260
C
3.94
4.45
0.155
0.175
D
0.38
0.51
0.015
0.020
F
1.02
1.78
0.040
0.070
G
2.54 BSC
0.100 BSC
H
0.76
1.27
0.030
0.050
J
0.20
0.30
0.008
0.012
K
2.92
3.43
0.115
0.135
L
7.62 BSC
0.300 BSC
M
---
10
---
10
N
0.76
1.01
0.030
0.040
_
_
SO8
D SUFFIX
CASE 75107
ISSUE W
SEATING
PLANE
1
4
5
8
N
J
X 45
_
K
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A AND B DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER
SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN
EXCESS OF THE D DIMENSION AT MAXIMUM
MATERIAL CONDITION.
A
B
S
D
H
C
0.10 (0.004)
DIM
A
MIN
MAX
MIN
MAX
INCHES
4.80
5.00
0.189
0.197
MILLIMETERS
B
3.80
4.00
0.150
0.157
C
1.35
1.75
0.053
0.069
D
0.33
0.51
0.013
0.020
G
1.27 BSC
0.050 BSC
H
0.10
0.25
0.004
0.010
J
0.19
0.25
0.007
0.010
K
0.40
1.27
0.016
0.050
M
0
8
0
8
N
0.25
0.50
0.010
0.020
S
5.80
6.20
0.228
0.244
X
Y
G
M
Y
M
0.25 (0.010)
Z
Y
M
0.25 (0.010)
Z
S
X
S
M
_
_
_
_
PACKAGE THERMAL DATA
Parameter
DIP8
SO8
Unit
R
JC
Typical
52
45
C/W
R
JA
Typical
100
165
C/W
CS8312
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6
Notes
CS8312
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7
Notes
CS8312
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8
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