Datasheet UC1724, UC2724, UC3724 Datasheet (UNITRODE)

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Isolated Drive Transmitter

UC1724 UC2724 UC3724

FEATURES

• 500mA Output Drive, Source or Sink

• 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

BLOCK DIAGRAM

DESCRIPTION

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.

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.

Note: Pin numbers refer to DIL-8 packages.

04/99

UDG-92037

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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 (V

HI, 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

0.3)V

Note 1: All voltages are with respect to GND (Pin 2); all cur-

rents are positive into, negative out of part.

Note 2: Consult Unitrode Integrated Circuit Databook for ther-

mal limitations and considerations of package.

Note 3: Pin numbers refer to DIL-8 packages.

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.

UC1724 UC2724 UC3724

CONNECTION DIAGRAMS

DIL-8 (Top View) J Or N Package

SOIC-16 (Top View) DW Package

ORDERING INFORMATION

TEMPERATURE RANGE PACKAGE

UC1724J –55°C to +125°C CDIP UC2724DW –25°C to +85°C SOIC-Wide UC2724N PDIP UC3724DW 0°C to +70°C SOIC-Wide UC3724N PDIP

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, V

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 V Threshold Hysteresis 0.4 1.0 1.5 V

Retriggerable One-Shot

Initial Accuracy T Temperature Stability Over Operating T Voltage Stability V Operating Frequency L Minimum Pulse Width RT = 2k CT = 300pF 100 500 1200 ns Operating Frequency RT = 2k C

Rising 7.75 9.5 V

= 25°C 1.54 1.9 2.25 µs

= 10 to 35V 0.2 0.5 %/V

= 1.4mH 100 150 200 kHz

LOAD

T = 300pF L

= 20V, RT= 4.3kΩ, CT= 1000pF, no load on any

1.0 2.9 µs

= 1.4mH 500 750 1100 kHz

LOAD

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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 0.8 V HIGH Input Current V LOW Input Current V

=+2.4V –220 –130 µA

=+0.4V –600 –300 µA

Delay to One-Shot 350 ns Delay to Output 250 ns

Output Drivers

Output Low Level I

Output High Level (Volts Below V

= 50mA 0.3 0.4 V

SINK

= 250mA 0.5 2.1 V

SINK SOURCE

SOURCE

= 50 mA 1.5 2.1 V = 250 mA 1.7 2.5 V

Rise/Fall Time No load 30 90 ns

Total Supply Current

Supply Current C

= 1.4V 15 30 mA

Additional Information

Please refer to the following Unitrode application topics. [1] Application Note U-127,

Isolated High-Side Switch Drive

[2] Design Note DN-35,

Drivers

by John A.O’Conner.

Unique Chip Pair Simplified

by John A.O’Connor.

IGBT Drive Using MOSFET Gate

Figure 1. Typical application

UNITRODE CORPORATION 7 CONTINENTAL BLVD. • MERRIMACK, NH 03054 TEL. (603) 424-2410 FAX (603) 424-3460

UDG-92038

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