UC1706 UC2706 UC3706 Dual Output Driver FEATURES DESCRIPTION • Dual, 1.5A Totem Pole Outputs • 40nsec Rise and Fall into 1000pF • Parallel or Push-Pull Operation The UC1706 family of output drivers are made with a high-speed Schottky process to interface between low-level control functions and high-power switching devices - particularly power MOSFET's. These devices implement three generalized functions as outlined below. • Single-Ended to Push-Pull Conversion • High-Speed, Power MOSFET Compatible • Low Cross-Conduction Current Spike • Analog, Latched Shutdown • Internal Deadband Inhibit Circuit • Low Quiescent Current • 5 to 40V Operation • Thermal Shutdown Protection • 16-Pin Dual-In-Line Package These devices are available in a two-watt plastic “bat-wing” DIP for operation over a 0°C to 70°C temperature range and, with reduced power, in a hermetically sealed cerdip for -55°C to +125°C operation. Also available in surface mount Q and L packages. • 20-Pin Surface Mount Package TRUTH TABLE First: They accept a single-ended, low-current digital input of either polarity and process it to activate a pair of high-current, totem pole outputs which can source or sink up to 1.5A each. Second: They provide an optional single-ended to push-pull conversion through the use of an internal flip-flop driven by double-pulsesuppression logic. With the flip-flop disabled, the outputs work in parallel for 3.0A capability. Third: Protection functions are also included for pulse-by-pulse current limiting, automatic deadband control, and thermal shutdown. INV H L H L BLOCK DIAGRAM 10/98 Powered by ICminer.com Electronic-Library Service CopyRight 2003 N.I H H L L OUT L H L L OUT = INV and N.I. OUT = INV or N.I. UC1706 UC2706 UC3706 ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N--Pkg . . . . . . . . . . . . J--Pkg Supply Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . 40V . . . . . . . . . . . . . . . . . . 40V Collector Supply Voltage, VC . . . . . . . . . . . . . . . . . . 40V . . . . . . . . . . . . . . . . . . 40V Output Current (Each Output, Source or Sink) Steady--State . . . . . . . . . . . . . . . . . . . . . . . . . . ±500mA . . . . . . . . . . . . . . ±500mA Peak Transient. . . . . . . . . . . . . . . . . . . . . . . . . . ±1.5A . . . . . . . . . . . . . . . . ±1.0A Capacitive Discharge Energy . . . . . . . . . . . . . . 20mJ. . . . . . . . . . . . . . . . . 15mJ Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V . . . . . . . . . . . . . . . . . 5.5V Analog Stop Inputs . . . . . . . . . . . . . . . . . . . . . . . . . VIN. . . . . . . . . . . . . . . . . . VIN Power Dissipation at TA = 25°C (See Note) . . . . . . . 2W . . . . . . . . . . . . . . . . . . 1W Power Dissipation at T (Leads/Case) = 25°C . . . . . . 5W . . . . . . . . . . . . . . . . . . . 2 (See Note) Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . --55°C to +125°C Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . --65°C to +150°C Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . . . . . . . 300°C Note: All voltages are with respect to the four ground pins which must be connected together. All currents are positive into, negative out of the specified trerminal. Consult Packaging sections of the Databook for thermal limitations and considerations of package. CONNECTION DIAGRAMS DIL-16, SOIC-16 (TOP VIEW) J or N Package, DW Package PLCC-20, LCC-20 (TOP VIEW) Q, L Packages Note: All four ground pins must be connected to a common ground. ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = –55°C to +125°C for the UC1706, –25°C to +85°C for the UC2706 and 0°C to +70°C for the UC3706; VIN = VC = 20V. TA = TJ. PARAMETERS TEST CONDITIONS VIN Supply Current VIN = 40V VC Supply Current VC = 40V, Outputs Low VC Leakage Current VIN = 0, VC = 30V, No Load MIN TYP MAX UNITS 8 10 mA 4 5 mA .05 0.1 mA 0.8 V Digital Input Low Level Digital Input High Level 2.2 V Input Current VI = 0 –0.6 –1.0 mA Input Leakage VI = 5V .05 0.1 mA Powered by ICminer.com Electronic-Library Service CopyRight 2003 2 UC1706 UC2706 UC3706 ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = –55°C to +125°C for the UC1706, –25°C to +85°C for the UC2706 and 0°C to +70°C for the UC3706; VIN = VC = 20V. TA = TJ. PARAMETERS TEST CONDITIONS MIN TYP MAX UNITS Output High Sat., VC-VO IO = -50mA 2.0 V Output Low Sat., VO IO = 50mA 0.4 V IO = 500mA 2.5 V V Inhibit Threshold VREF = 0.5V 0.4 0.6 VREF = 3.5V 3.3 3.7 V –20 mA 130 160 mV –10 –20 mA Inhibit Input Current VREF = 0 Analog Threshold VCM = 0 to 15V Input Bias Current VCM = 0 –10 100 Thermal Shutdown 155 °C TYPICAL SWITCHING CHARACTERISTICS: VIN = VC = 20V, TA = 25°C. Delays measured to 10% output change. PARAMETERS TEST CONDITIONS OUTPUT CL = UNITS open 1.0 2.2 nF Rise Time Delay 110 130 140 ns 10% to 90% Rise 20 40 60 ns Fall Time Delay 80 90 110 ns 90% to 10% Fall 25 30 50 ns Rise Time Delay 120 130 140 ns 10% to 90% Rise 20 40 60 ns Fall Time Delay 100 120 130 ns 90% to 10% Fall 25 30 50 VC Cross-Conduction Current Spike Duration Output Rise 25 ns From Inv. Input to Output: From N. I. Input to Output: Output Fall ns 0 ns Inhibit Delay Inhibit Ref. = 1V, Inhibit Inv. = 0.5 to 1.5V 250 ns Analog Shutdown Delay Stop Non-Inv. = 0V, Stop Inv. = 0 to 0.5V 180 ns CIRCUIT DESCRIPTION Digital Inputs With both an inverting and non-inverting input available, either active-high or active-low signals may be accepted. These are true TTL compatible inputs—the threshold is approximately 1.2V with no hysteresis; and external pullup resistors are not required. Outputs The totem-pole outputs have been designed to minimize cross-conduction current spikes while maximizing fast, high-current rise and fall times. Current limiting can be done externally either at the outputs or at the common VC pin. The output diodes included have slow recovery and should be shunted with high-speed external diodes when driving high-frequency inductive loads. Inhibit Circuit Although it may have other uses, this circuit is included to eliminate the need for deadband control when driving relatively slow bipolar power transistors. A diode from each inhibit input to the opposite power switch collector will keep one output from turning-on until the other has turned-off. The threshold is determined by the voltage on pin 15 which can be set from 0.5 to 3.5V. When this circuit is not used, ground pin 15 and leave 1 and 16 open. Flip/Flop Grounding pin 7 activates the internal flip-flop to alternate the two outputs. With pin 7 open, the two outputs operate simultaneously and can be paralleled for higher current operation. Since the flip-flop is triggered by the digital input, an off-time of at last 200nsec must be provided to allow the flip/flop to change states. Note that the circuit logic is configured such that the “OFF” state is defined as the outputs low. Powered by ICminer.com Electronic-Library Service CopyRight 2003 3 UC1706 UC2706 UC3706 CIRCUIT DESCRIPTION (cont.) use with a 7 to 40V supply; however, with some slight response time degradation, it can also be driven from 5V. When VIN is low, the entire circuit is disabled and no current is drawn from VC. When combined with a UC1840 PWM, the Driver Bias switch can be used to supply VIN to the UC1706. VIN switching should be fast as if VC is high, undefined operation of the outputs may occur with VIN less than 5V. Analog Shutdown This circuit is included to get a latched shutdown as close to the outputs as possible, from a time standpoint. With an internal 130mV threshold, this comparator has a common-mode range from ground to (VIN – 3V). When not used, both inputs should be grounded. The time required for this circuit to latch is inversely proportional to the amount of overdrive but reaches a minimum of 180nsec. As with the flip-flop, an input off-time of at least 200nsec is required to reset the latch between pulses. Thermal Considerations Should the chip temperature reach approximately 155°C, a parallel, non--inverting input is activated driving both outputs to the low state. Supply Voltage With an internal 5V regulator, this circuit is optimized for APPLICATIONS D1, D2; UC3611 Schottky Diodes D1, D2; UC3611 Schottky Diodes Power MOSFET Drive Circuit Power MOSFET Drive Circuit Using Negative Bias Voltage and Level Shifting to Ground Referenced PWMs D1, D2: UC3611 Schottky Diodes Transformer Coupled MOSFET Drive Circuit Powered by ICminer.com Electronic-Library Service CopyRight 2003 4 Charge Pump Circuits UC1706 UC2706 UC3706 APPLICATIONS (cont'd) D1, D2: UC3611 Schottky Diodes D1, D2: UC3611 Schottky Diodes Power Bipolar Drive Circuit Transformer Coupled Push-Pull MOSFET Drive Circuit UC3706 Converts Single Output PWMs to High Current Push-Pull Configuration UNITRODE CORPORATION 7 CONTINENTAL BLVD. • MERRIMACK, NH 03054 TEL. (603) 424-2410 • FAX (603) 424-3460 Powered by ICminer.com Electronic-Library Service CopyRight 2003 5 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. 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