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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.
http://onsemi.com 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
* * * *
Features P Compatible Inputs Adjustable Current Limit Thresholds External Sense Resistor Flag Signal to Indicate Output Status
VCC
CTRL
Control Logic VT
Gate Driver 5.0 V
OUT
PIN CONNECTIONS
FLAG Latch VREF SENSE+ FLAG SENSE+ SENSE- GND 1 VCC CTRL CLI OUT
VT
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
(c) Semiconductor Components Industries, LLC, 2001
1
March, 2001 - Rev. 4
Publication Order Number: CS8312/D
CS8312
ABSOLUTE MAXIMUM RATINGS*
Rating Supply Voltage Digital Input Currents Internal Power Dissipation (TA = 25C) Junction Temperature Range Storage Temperature Range Electrostatic Discharge (Human Body Model) Lead Temperature Soldering 1. 10 seconds max. 2. 60 seconds max above 183C *The maximum package power dissipation must be observed. 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
ELECTRICAL CHARACTERISTICS (7.0 V VCC 10 V, -40C TA 125C,
-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, IQ Turn On Turn Off Supply Voltage Rejection Differential Ground Rejection Ratio Differential Ground Current Ratio VCTRL = 5.5 V VCTRL = -0.3 V VCTRL = 5.5 V VCTRL = 5.5 V VCTRL = -0.3 V, (VSENSE- - VGND)DC = 1.0 V (VSENSE- - VGND)AC = 0.6 V VCTRL = 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 s s
ICTRL = 2.0 mA CTRL Increasing CTRL Decreasing ICTRL = 10 A max -
-0.3 - 1.5 0.4 - -
- - - - - -
5.5 3.5 - 2.0 1.1 50
V V V V V pF
ICTRL = 2.0 mA CLI Increasing CLI Decreasing ICLI = 10 A max
-0.3 - 1.5 0.4 -
- - - - -
5.5 3.5 - 2.0 1.1
V V V V V
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ELECTRICAL CHARACTERISTICS (continued) (7.0 V VCC 10 V, -40C TA 125C,
-0.2 V Differential Ground Voltage 0.8 V; unless otherwise specified.) Characteristic Current Limit Increase Function (continued) Input Capacitance Output Stage IOUT Clamp Voltage Output Off Voltage Flag Function Output Low Leakage Current Output Capacitance Turn On (VSENSE+ - VSENSE-) Turn Off Delay Turn On Delay Disable Time Sense Function Input Voltage Range Sense Regulation Voltage Input Leakage Current Propagation Delay - VCTRL = 5.5 V, VCLI = -0.3 V VCTRL = 5.5 V, VCLI = 5.5 V VCTRL = 5.5 V VCTRL = 5.5 V -0.3 270 380 - - - 295 410 - - 2.5 320 440 5.0 20 V mV mV A s VCTRL = 5.5 V, IFLAG = 1.5 mA VCTRL = -0.3 V - VCTRL = 5.5 V, VCLI = -0.3 V VCTRL = 5.5 V, VCLI = 5.5 V CTRL Decreasing - - - - - 210 300 - - 100 - - - 225 - - - - 0.9 10 50 240 350 10 10 450 V A pF mV mV s s s - VCTRL = 5.5 V, IOUT = 1.0 mA VCTRL = -0.3 V, IOUT = 10 A VCTRL = -0.3 V, IOUT = 200 A - 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 VCC FUNCTION Indicates whether current through the IGBT has reached a preset 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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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 (RSENSE) 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.
VCC
VBAT
0.1 F
LOAD
VCC VCC OUT R FLAG Microprocessor CTRL SENSE+ CLI SENSE- GND RSENSE CS8312
Figure 2. Application and Test Diagram
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CS8312
PACKAGE DIMENSIONS
DIP-8 N SUFFIX CASE 626-05 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. DIM A B C D F G H J K L M N MILLIMETERS MIN MAX 9.40 10.16 6.10 6.60 3.94 4.45 0.38 0.51 1.02 1.78 2.54 BSC 0.76 1.27 0.20 0.30 2.92 3.43 7.62 BSC --10_ 0.76 1.01 INCHES MIN MAX 0.370 0.400 0.240 0.260 0.155 0.175 0.015 0.020 0.040 0.070 0.100 BSC 0.030 0.050 0.008 0.012 0.115 0.135 0.300 BSC --10_ 0.030 0.040
8
5
-B-
1 4
F
NOTE 2
-A- L
C -T-
SEATING PLANE
J N D K
M
M TA
M
H
G 0.13 (0.005) B
M
SO-8 D SUFFIX CASE 751-07 ISSUE W
-X- A
8 5 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. DIM A B C D G H J K M N S MILLIMETERS MIN MAX 4.80 5.00 3.80 4.00 1.35 1.75 0.33 0.51 1.27 BSC 0.10 0.25 0.19 0.25 0.40 1.27 0_ 8_ 0.25 0.50 5.80 6.20 INCHES MIN MAX 0.189 0.197 0.150 0.157 0.053 0.069 0.013 0.020 0.050 BSC 0.004 0.010 0.007 0.010 0.016 0.050 0_ 8_ 0.010 0.020 0.228 0.244
B
1 4
S
0.25 (0.010)
M
Y
M
-Y- G C -Z- H D 0.25 (0.010)
M SEATING PLANE
K
N
X 45 _
0.10 (0.004)
M
J
ZY
S
X
S
PACKAGE THERMAL DATA Parameter RJC RJA Typical Typical DIP-8 52 100 SO-8 45 165 Unit C/W C/W
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Notes
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CS8312
Notes
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CS8312
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CS8312/D

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