UC1724 UC2724 UC3724 Isolated Drive Transmitter FEATURES DESCRIPTION • 500mA Output Drive, Source or Sink The UC1724 family of Isolated Drive Transmitters, along with the UC1725 Isolated Drivers, provide a unique solution to driving isolated power MOSFET gates. They are particularly suited to drive the high-side devices on a high-voltage H-bridge. The UC1724 devices transmit drive logic, and drive power, to the isolated gate circuit using a low cost pulse transformer. • 8 to 35V Operation • Transmits Logic Signal Instantly • Programmable Operating Frequency • Under-Voltage Lockout • Able To Pass DC Information Across Transformer • Up To 600kHz Operation This drive system utilizes a duty-cycle modulation technique that gives instantaneous response to the drive control transistions, and reliably passes steady-state, or DC, conditions. High frequency operation, up to 600kHz, allows the cost and size of the coupling transformer to be minimized. These devices will operate over an 8 to 35 Volt supply range. The dual high current totem pole outputs are disabled by an uder-voltage lockout circuit to prevent spurious responses during startup or low voltage conditions. These devices are available in 8 pin plastic or ceramic dual-inline packages, as well as 16 pin SOIC package. BLOCK DIAGRAM Note: Pin numbers refer to DIL-8 packages. 04/99 UDG-92037 UC1724 UC2724 UC3724 CONNECTION DIAGRAMS ABSOLUTE MAXIMUM RATINGS Supply Voltage VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Source/Sink Current (Pulsed) . . . . . . . . . . . . . . . . . . . . . . . . 1A Source/Sink Current (Continuous) . . . . . . . . . . . . . . . . . . . 0.5A Ouput Voltage (Pins 4, 6). . . . . . . . . . . . . . . –0.3 to (VIN +0.3)V PHI, RT, and CT inputs (Pins 1, 7, and 8) . . . . . . . . . –0.3 to 6V Operating Junction Temperature (Note 2) . . . . . . . . . . . . 150°C Storage Temperature Range . . . . . . . . . . . . . . –65°C to 150°C Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . 300°C Note 1: All voltages are with respect to GND (Pin 2); all currents are positive into, negative out of part. Note 2: Consult Unitrode Integrated Circuit Databook for thermal limitations and considerations of package. Note 3: Pin numbers refer to DIL-8 packages. DIL-8 (Top View) J Or N Package SOIC-16 (Top View) DW Package RECOMMENDED OPERATION CONDITIONS Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +9V to +35V Sink/Source Load Current (each output) . . . . . . . . . 0 to 500mA Timing Resistor. . . . . . . . . . . . . . . . . . . . . . . . . . . 2kW to 10kW Timing Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . 300pF to 3nF Operating Temperature Range (UC1724) . . . –55°C<TA<125°C Operating Temperature Range (UC3724) . . . . . . 0°C<TA<70°C Note 4: Range over which the device is functional and parameter limits are guaranteed. ORDERING INFORMATION TEMPERATURE RANGE –55°C to +125°C –25°C to +85°C UC1724J UC2724DW UC2724N UC3724DW UC3724N 0°C to +70°C PACKAGE CDIP SOIC-Wide PDIP SOIC-Wide PDIP ELECTRICAL CHARACTERISTICS: Unless otherwise stated, VCC = 20V, RT = 4.3kΩ, CT = 1000pF, no load on any output and these specifications apply for: –55oC < TA < 125oC for the UC1724, –25oC < TA < 85oC for the UC2724, and 0oC < TA < 70oC for the UC3724. TA=TJ. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Under-Voltage Lockout Start-Up Threshold VIN Rising Threshold Hysteresis 7.75 9.5 V 0.4 1.0 1.5 V 1.9 2.25 µs Retriggerable One-Shot Initial Accuracy TJ = 25°C 1.54 Temperature Stability Over Operating TJ 1.0 Voltage Stability VIN = 10 to 35V 0.2 2.9 µs 0.5 %/V Operating Frequency LLOAD = 1.4mH 100 150 200 kHz Minimum Pulse Width RT = 2k CT = 300pF 100 500 1200 ns Operating Frequency RT = 2k CT = 300pF LLOAD = 1.4mH 500 750 1100 kHz 2 UC1724 UC2724 UC3724 ELECTRICAL CHARACTERISTICS: Unless otherwise stated, VCC = 20V, RT = 4.3kΩ, CT = 1000pF, no load on any output and these specifications apply for: –55oC < TA < 125oC for the UC1724, –25oC < TA < 85oC for the UC2724, and 0oC < TA < 70oC for the UC3724. TA=TJ. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Phi Input (Control Input) HIGH Input Voltage 2.0 V LOW Input Voltage HIGH Input Current LOW Input Current 0.8 VIH = +2.4V VIL = +0.4V V –220 –130 µA –600 –300 µA Delay to One-Shot 350 ns Delay to Output 250 ns 0.4 V Output Drivers Output Low Level Output High Level (Volts Below VCC) Rise/Fall Time ISINK = 50mA 0.3 ISINK = 250mA 0.5 2.1 V ISOURCE = 50 mA 1.5 2.1 V ISOURCE = 250 mA 1.7 2.5 V No load 30 90 ns CT = 1.4V 15 30 mA Total Supply Current Supply Current Additional Information Please refer to the following Unitrode application topics. [1] Application Note U-127, Unique Chip Pair Simplified Isolated High-Side Switch Drive by John A. O’Connor. [2] Design Note DN-35, IGBT Drive Using MOSFET Gate Drivers by John A. O’Conner. UDG-92038 Figure 1. Typical application UNITRODE CORPORATION 7 CONTINENTAL BLVD. • MERRIMACK, NH 03054 TEL. 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