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 8 8 1 DIP–8 N SUFFIX CASE 626 CS8312YN8 AWL YYWW 8 8 CS831 ALYW2 1 SO–8 D SUFFIX CASE 751 VCC Control Logic MARKING DIAGRAMS 1 • • • • CTRL http://onsemi.com Gate Driver 1 A WL, L YY, Y WW, W OUT = Assembly Location = Wafer Lot = Year = Work Week 5.0 V VT PIN CONNECTIONS SENSE+ FLAG FLAG Latch VREF VT GND CLI 1 VCC SENSE+ CTRL SENSE– GND CLI OUT SENSE– ORDERING INFORMATION Figure 1. Block Diagram Semiconductor Components Industries, LLC, 2001 March, 2001 – Rev. 4 Device 1 Package Shipping CS8312YN8 DIP–8 50 Units/Rail CS8312YD8 SO–8 95 Units/Rail CS8312YDR8 SO–8 2500 Tape & Reel Publication Order Number: CS8312/D CS8312 ABSOLUTE MAXIMUM RATINGS* Rating Value Unit –0.3 to 12 V Digital Input Currents 2.0 mA Internal Power Dissipation (TA = 25°C) 700 mW Junction Temperature Range –40 to +150 °C Storage Temperature Range –55 to +165 °C 2.0 kV 260 peak 230 peak °C °C Supply Voltage Electrostatic Discharge (Human Body Model) Lead Temperature Soldering Wave Solder (through hole styles only) Note 1. Reflow (SMD styles only) Note 2. 1. 10 seconds max. 2. 60 seconds max above 183°C *The maximum package power dissipation must be observed. ELECTRICAL CHARACTERISTICS (7.0 V ≤ VCC ≤ 10 V, –40°C ≤ TA ≤ 125°C, –0.2 V ≤ Differential Ground Voltage ≤ 0.8 V; unless otherwise specified.) Characteristic Test Conditions Min Typ Max Unit Power Supply Including Ripple Voltage – 7.0 – 10 V Supply Ripple Frequency – 10 – 60 kHz Differential Ground Frequency – 10 – 60 kHz General Quiescent Current, IQ Turn On Turn Off VCTRL = 5.5 V VCTRL = –0.3 V – – – – 15 5.0 mA mA Supply Voltage Rejection VCTRL = 5.5 V 30 – – dB Differential Ground Rejection Ratio VCTRL = 5.5 V 30 – – dB Differential Ground Current Ratio VCTRL = –0.3 V, (VSENSE– – VGND)DC = 1.0 V (VSENSE– – VGND)AC = 0.6 V – – 3.0 mA Unity Gain Bandwidth VCTRL = 5.5 V 400 – – kHz Turn On Delay CTRL Increasing – – 30 µs Turn Off Delay CTRL Decreasing – – 30 µs Control Function Input Voltage Range ICTRL = 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 ICTRL = 10 µA max – – 1.1 V – – 50 pF Input Capacitance – Current Limit Increase Function Input Voltage Range ICTRL = 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 ICLI = 10 µA max – – 1.1 V http://onsemi.com 2 CS8312 ELECTRICAL CHARACTERISTICS (continued) (7.0 V ≤ VCC ≤ 10 V, –40°C ≤ TA ≤ 125°C, –0.2 V ≤ Differential Ground Voltage ≤ 0.8 V; unless otherwise specified.) Characteristic Test Conditions Min Typ Max Unit – – – 50 pF – – – 5.0 mA Current Limit Increase Function (continued) Input Capacitance Output Stage IOUT Clamp Voltage VCTRL = 5.5 V, IOUT = 1.0 mA 4.0 – 5.5 V Output Off Voltage VCTRL = –0.3 V, IOUT = 10 µA VCTRL = –0.3 V, IOUT = 200 µA – – – – 0.5 1.2 V V Output Low VCTRL = 5.5 V, IFLAG = 1.5 mA – – 0.9 V Leakage Current VCTRL = –0.3 V – – 10 µA – – 50 pF 210 300 225 – 240 350 mV mV – – 10 µs Flag Function Output Capacitance – Turn On (VSENSE+ – VSENSE–) VCTRL = 5.5 V, VCLI = –0.3 V VCTRL = 5.5 V, VCLI = 5.5 V Turn Off Delay CTRL Decreasing Turn On Delay – – – 10 µs Disable Time – 100 – 450 µs – –0.3 – 2.5 V 270 380 295 410 320 440 mV mV Sense Function Input Voltage Range Sense Regulation Voltage VCTRL = 5.5 V, VCLI = –0.3 V VCTRL = 5.5 V, VCLI = 5.5 V Input Leakage Current VCTRL = 5.5 V – – 5.0 µA Propagation Delay VCTRL = 5.5 V – – 20 µs PACKAGE PIN DESCRIPTION PACKAGE PIN # DIP–8 SO–8 PIN SYMBOL 1 1 FLAG 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 8 8 VCC FUNCTION Indicates whether current through the IGBT has reached a preset level. Control input. Supply voltage. http://onsemi.com 3 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%. 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 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 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 µF LOAD VCC VCC OUT CS8312 R FLAG Microprocessor CTRL SENSE+ CLI RSENSE SENSE– GND Figure 2. Application and Test Diagram http://onsemi.com 4 CS8312 PACKAGE DIMENSIONS DIP–8 N SUFFIX CASE 626–05 ISSUE L 8 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. 5 –B– 1 4 F –A– NOTE 2 L C J –T– 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 DIM A B C D F G H J K L M N 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 N SEATING PLANE D M K G H 0.13 (0.005) M T A M B M SO–8 D SUFFIX CASE 751–07 ISSUE W –X– 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 8 5 0.25 (0.010) S B 1 M Y M 4 K –Y– G C N X 45 SEATING PLANE –Z– 0.10 (0.004) H M D 0.25 (0.010) M Z Y S X J S 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 PACKAGE THERMAL DATA DIP–8 Parameter SO–8 Unit RΘJC Typical 52 45 °C/W RΘJA Typical 100 165 °C/W http://onsemi.com 5 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 CS8312 Notes http://onsemi.com 6 CS8312 Notes http://onsemi.com 7 CS8312 ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. 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