Datasheet UC1708, UC2708, UC3708 Datasheet (UNITRODE)

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查询UC1708供应商

Dual Non-Inverting Power Driver

FEATURES DESCRIPTION

• 3.0A Peak Current Totem Pole Output

• 5 to 35V Operation

• 25ns Rise and Fall Times

• 25ns Propagation Delays

• Thermal Shutdown and Under-

Voltage Protection

• High-Speed, Power MOSFET Compatible

• Efficient High Frequency Operation

• Low Cross-Conduction Current Spike

• Enable and Shutdown Functions

• Wide Input Voltage Range

• ESD Protection to 2kV

BLOCK DIAGRAM

The UC1708 family of power drivers is made with a high-speed, highvoltage, Schottky p rocess to interface control functions and high-power switching devices – par t icula rly p ower MOS FETs. Operating over a 5 to 35 volt supply range, thes e devices conta in two inde pendent channels. The A and B input s are compatible with TTL and CMOS logic families, but can withstand input voltages as high as V or sink up to 3A as long as power dissipation limits are not exceeded.

Although each output can be activated independently with its own inputs, they can be forced low in commo n through the action of either a digital high signal at the Shutdown terminal or by forcing the Enable terminal low. The Shutdown ter minal w ill only force the outputs low, it will not effect the behavior of the rest of the device. The Enable terminal effectively places the device in under-voltage lockout, reducing power consumption by as much as 90%. During under-voltage and disable (Enable terminal forced low) conditions, the outputs are held in a self-biasing, low-voltage, state.

The UC3708 and UC2708 are available in plastic 8-pin MINIDIP and 16pin "bat-wing" DIP packages for commercial operation over a 0

+70

C temperatu re range and industrial temperature range of -25oC to

+85

C respectively. For operation over a -55oC to +125oC temperature range, the UC1 708 is available in hermetically sealed 8-pin MINIDIP and 16 pin DIP packages. Surface mount devices are also available .

UC1708 UC2708 UC3708

. Each output can source

C to

Note: Shutdown feature a vailable only in JE , NE or DW pac k ag es.

3/97

UDG-92024-1

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UC1708 UC2708 UC3708

ABSOLUTE MAXIMUM RATINGS

Supply Voltage VIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35V

Output Current (Each Output, Source or Sink)

Steady-State. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5A

Peak Transient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3A

Ouput Voltage . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (VIN + 0.3)V

Enable and Shutdown Inputs . . . . . . . . . . . . . . . . . -0.3 to 6.2V

A and B Inputs . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (VIN + 0.3)V

Operating Junction Temperature (Note 2) . . . . . . . . . . . . 150°C

Storage Temperature Range . . . . . . . . . . . . . . . . -65° to 150°C

Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . 300°C

(Note 1)

NOTE 1: All voltages are with respect to Logic Gnd pin. All currents are positive into, negative out of, device terminals. NOTE 2: Consult Unitrode Integrated Circuits databook for information regarding thermal specifications and limitations of packages.

SOIC-16 (T op View) DW Package

CONNECTION DIAGRAMS

DIL-8 (T op Vie w) J Or N Package

DIL-16 (Top View) JE or NE Package

Note: In JE package Pin 4 is logic ground. Pins 5, 12, and 13 are N/C.

ELECTRICAL CHARACTERISTICS:

–55oC<TA<125oC for the UC1708, –25oC<TA<+85oC for the UC2708, and 0oC<TA<70oC for the UC3708. T

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

Supply Current OutputsLow 18 26 mA

A, B and Shutdown Inputs Low Level

A, B and Shutdown Inputs High Level

A, B Input Current Low V A, B Input Current High V A, B Input Leakage Current High V Shutdown Input Current Low V Shutdown Input Current High V

Unless otherwise stated, VIN=10V to 35V, and thes e specificatio ns app ly for:

= T

Outputs Hig h 14 18 mA Enable = 0V 1 4 mA

2.0 V

= 0.4V -1 -0.6 mA

A,B

= 2.4V -200 50

A,B

= 35.3V 200

A,B SHUTDOWN SHUTDOWN

SHUTDOWN

= 0.4V 20 100 = 2.4V 170 500 = 6.2V 0.6 1.5 mA

0.8 V

µ µ µ µ

A A A A

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ELECTRICAL CHARACTERISTICS (cont.):

for: –55oC<TA<125oC for the UC1708, –25oC<TA<+85oC for the UC2708, and 0oC<TA<70oC for the UC3708. TA = T

Unless otherwise stated, VIN = 10V to 35V, and these sp ec if ic ations apply

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

= 0V -600 -460 200

Enable Input Current Low V Enable Input Current High V

ENABLE

= 6.2V 200

ENABLE

Enable Threshold Rising 2.8 3.6 V Enable Threshold Falling 1.0 2.4 3.4 V Output High Sat., V

Output Low Sat., V

OUT

- V

OUT

= -50mA 2.0 V

OUT

= -500mA 2.5 V

OUT

= 50mA 0.5 V

OUT

= 500mA 2.5 V

OUT

Thermal Shutdown 155

UC1708 UC2708 UC3708

SWITCHING CHARACTERISTICS (Figure 1)

(VIN = 20V, delays measured to 10% output cha ng e. )

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

From A,B Input to Output:

Rise Time Delay (TPLH) CL = 0pF 25 40 ns

CL = 1000pF (Note 3) 25 40 ns CL = 2200pF 30 45 ns

10% to 90% Rise (TTLH) CL = 0pF 55 75 ns

CL = 1000pF (Note 3) 25 50 ns CL = 2200pF 40 55 ns

Fall Time Delay (TPHL) CL = 0pF 25 40 ns

CL = 1000pF (Note 3) 25 45 ns CL = 2200pF 35 50 ns

90% to 10% Fall (TTHL) CL = 0pF 15 20 ns

CL = 1000pF (Note 3) 25 45 ns CL = 2200pF 40 55 ns

From Shutdown Input to Output

Rise Time Delay (TPLH) CL = 0pF 25 75 ns

CL = 1000pF (Note 3) 30 75 ns CL = 2200pF 35 75 ns

10% to 90% Rise (TTLH) CL = 0pf 50 75 ns

CL = 1000pF (Note 3) 25 50 ns CL = 2200pF 40 55 ns

Fall Time Delay (TPHL) CL = 0pF 25 45 ns

CL = 1000pF (Note 3) 30 50 ns CL = 2200pF 35 55 ns

90% to 10% Fall (TTHL) CL = 0pF 25 20 ns

CL = 1000pF (Note 3) 25 45 ns CL = 2200pF 40 55 ns

Total Supply Current F = 200kHz, 50% duty cy cl e, both channels; CL = 0pF 23 25 mA

F = 200kHz, 50% duty cy cl e, both channels; CL = 2200 pF 38 45 mA

NOTE 3: These parameters, specified at 1000pF, although guaranteed over recommended operating conditions, are not tested in production.

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Figure 1: AC Test Circuit and Switching Time Waveforms

UC1708 UC2708 UC3708

Figure 2: Equivalent Input Circuits

UDG-92026

4.3V

INPUT

OUTPUT

20V

50%

90%

10%

50%

90%

10%

Note: Shutdown feature available on ly in JE, NE or DW Packages .

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

UDG-92025

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