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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
•
µP
Compatible Inputs
•
Adjustable Current Limit Thresholds
•
External Sense Resistor
•
Flag Signal to Indicate Output Status
V
CC
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MARKING
DIAGRAMS
8
1
DIP–8
N SUFFIX
CASE 626
8
CS8312YN8
AWL
YYWW
1
8
8
1
SO–8
D SUFFIX
CASE 751
A
WL, L
YY, Y
WW, W
CS831
ALYW2
1
= Assembly Location
= Wafer Lot
= Year
= Work Week
CTRL
Control
Logic
V
T
Gate
Driver
5.0 V
OUT
PIN CONNECTIONS
FLAG
Latch
V
REF
SENSE+
FLAG
SENSE+
SENSE–
GND
1
V
CC
CTRL
CLI
OUT
V
T
GND
CLI
SENSE–
ORDERING INFORMATION
Figure 1. Block Diagram
Device
CS8312YN8
CS8312YD8
CS8312YDR8
Package
DIP–8
SO–8
SO–8
Shipping
50 Units/Rail
95 Units/Rail
2500 Tape & Reel
Semiconductor Components Industries, LLC, 2001
2878
March, 2001 – Rev. 4
Publication Order Number:
CS8312/D
CS8312
ABSOLUTE MAXIMUM RATINGS*
Rating
Supply Voltage
Digital Input Currents
Internal Power Dissipation (T
A
= 25°C)
Junction Temperature Range
Storage Temperature Range
Electrostatic Discharge (Human Body Model)
Lead Temperature Soldering
Wave Solder (through hole styles only) Note 1
Reflow (SMD styles only) Note 2
Value
–0.3 to 12
2.0
700
–40 to +150
–55 to +165
2.0
260 peak
230 peak
Unit
V
mA
mW
°C
°C
kV
°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
General
Power Supply Including Ripple Voltage
Supply Ripple Frequency
Differential Ground Frequency
Quiescent Current, I
Q
Turn On
Turn Off
Supply Voltage Rejection
Differential Ground Rejection Ratio
Differential Ground Current Ratio
V
CTRL
= 5.5 V
V
CTRL
= –0.3 V
V
CTRL
= 5.5 V
V
CTRL
= 5.5 V
V
CTRL
= –0.3 V,
(V
SENSE–
– V
GND
)DC = 1.0 V
(V
SENSE–
– V
GND
)AC = 0.6 V
V
CTRL
= 5.5 V
CTRL Increasing
CTRL Decreasing
–
–
–
7.0
10
10
–
–
30
30
–
–
–
–
–
–
–
–
–
10
60
60
15
5.0
–
–
3.0
V
kHz
kHz
mA
mA
dB
dB
mA
Test Conditions
Min
Typ
Max
Unit
Unity Gain Bandwidth
Turn On Delay
Turn Off Delay
Control Function
Input Voltage Range
Input Threshold
Turn On
Turn Off
Hysteresis
Voltage
Input Capacitance
Current Limit Increase Function
Input Voltage Range
Input Threshold
Turn On
Turn Off
Hysteresis
Voltage
400
–
–
–
–
–
–
30
30
kHz
µs
µs
I
CTRL
= 2.0 mA
CTRL Increasing
CTRL Decreasing
I
CTRL
= 10
µA
max
–
–0.3
–
1.5
0.4
–
–
–
–
–
–
–
–
5.5
3.5
–
2.0
1.1
50
V
V
V
V
V
pF
I
CTRL
= 2.0 mA
CLI Increasing
CLI Decreasing
I
CLI
= 10
µA
max
–0.3
–
1.5
0.4
–
–
–
–
–
–
5.5
3.5
–
2.0
1.1
V
V
V
V
V
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2879
CS8312
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
Current Limit Increase Function (continued)
Input Capacitance
Output Stage
I
OUT
Clamp Voltage
Output Off Voltage
Flag Function
Output Low
Leakage Current
Output Capacitance
Turn On (V
SENSE+
– V
SENSE–
)
Turn Off Delay
Turn On Delay
Disable Time
Sense Function
Input Voltage Range
Sense Regulation Voltage
Input Leakage Current
Propagation Delay
–
V
CTRL
= 5.5 V, V
CLI
= –0.3 V
V
CTRL
= 5.5 V, V
CLI
= 5.5 V
V
CTRL
= 5.5 V
V
CTRL
= 5.5 V
–0.3
270
380
–
–
–
295
410
–
–
2.5
320
440
5.0
20
V
mV
mV
µA
µs
V
CTRL
= 5.5 V, I
FLAG
= 1.5 mA
V
CTRL
= –0.3 V
–
V
CTRL
= 5.5 V, V
CLI
= –0.3 V
V
CTRL
= 5.5 V, V
CLI
= 5.5 V
CTRL Decreasing
–
–
–
–
–
210
300
–
–
100
–
–
–
225
–
–
–
–
0.9
10
50
240
350
10
10
450
V
µA
pF
mV
mV
µs
µs
µs
–
V
CTRL
= 5.5 V, I
OUT
= 1.0 mA
V
CTRL
= –0.3 V, I
OUT
= 10
µA
V
CTRL
= –0.3 V, I
OUT
= 200
µA
–
4.0
–
–
–
–
–
–
5.0
5.5
0.5
1.2
mA
V
V
V
–
–
–
50
pF
Test Conditions
Min
Typ
Max
Unit
PACKAGE PIN DESCRIPTION
PACKAGE PIN #
DIP–8
1
2
3
4
5
6
7
8
SO–8
1
2
3
4
5
6
7
8
PIN SYMBOL
FLAG
SENSE+
SENSE–
GND
OUT
CLI
CTRL
V
CC
FUNCTION
Indicates whether current through the IGBT has reached a pre-
set level.
Positive input to current comparator.
Ground (SENSE–) for current sense resistor.
Ground connection.
Output voltage to IGBT (MOSFET) gate.
Current limit input increase.
Control input.
Supply voltage.
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2880
CS8312
CIRCUIT DESCRIPTION
Flag Function (See Figure 2)
Output Stage
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 turn–on 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
0
1
2
3
0
CONTROL
Low
High
High
High
Low
SENSE+
X
Below Threshold
Above Threshold
X
X
FLAG
OFF
OFF
ON
ON
OFF
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.
V
CC
V
BAT
0.1
µF
LOAD
V
CC
V
CC
OUT
R
FLAG
Microprocessor
CTRL
SENSE+
CLI
SENSE–
GND
R
SENSE
CS8312
Figure 2. Application and Test Diagram
PACKAGE THERMAL DATA
Parameter
R
ΘJC
R
ΘJA
Typical
Typical
DIP–8
52
100
SO–8
45
165
Unit
°C/W
°C/W
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2881
