SLUS171A - MARCH 1997 - REVISED AUGUST 2001

BLOCK DIAGRAM

•

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

The UC1708 family of power drivers is made with a high-speed,

high-voltage, Schottky process to interface control functions and high-power

switching devices – particularly power MOSFETs. Operating over a 5 to 35

volt supply range, these devices contain two independent channels. The A

and B inputs are compatible with TTL and CMOS logic families, but can

withstand input voltages as high as V

IN. Each output can source 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 common through the action of either a digital high

signal at the Shutdown terminal or by forcing the Enable terminal low. The

Shutdown terminal will only force the outputs low, it will not effect the behav

ior 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 MINI DIP and 16-pin

“bat-wing” DIP packages for commercial operation over a 0

Cto+70

C tem-

perature range and industrial temperature range of -25

Cto+85

respectively. For operation over a -55

C to +125

C temperature range, the

UC1708 is available in hermetically sealed 8-pin MINI CDIP, 16 pin CDIP

and 20 pin CLCC packages. Surface mount devices are also available.

UC1708

UC2708

UC3708

Dual Non-Inverting Power Driver

Note: Shutdown feature is not available in J or N packages only.

UDG-92024-1

FEATURES DESCRIPTION

application

INFO

available

CONNECTION DIAGRAMS

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

ABSOLUTE MAXIMUM RATINGS (Note 1)

UC1708

UC2708

UC3708

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.

DIL-8 (Top View)

J Or N Package

Note: In JE package Pin 4 is logic ground. Pins 5, 12,

and 13 are N/C.

DIL-16 (Top View)

JE or NE Package

SOIC-16 (Top View)

DW Package

321

N/C 6

20 19

910111213

N/C

SHUTDOWN

LOGIC GND

ENABLE

INPUT A

N/C

PWR GND A

OUTPUT A

INPUT B

N/C

PWR GND B

OUTPUT B

N/C

VIN

N/C

CLCC-20 (Top View)

L Package

UC1708

UC2708

UC3708

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

SWITCHING CHARACTERISTICS (Figure 1), (VIN = 20V, delays measured to 10% output change.)

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

production.

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

IN Supply Current OutputsLow 18 26 mA

Outputs High 14 18 mA

Enable = 0V 1 4 mA

A, B and Shutdown Inputs Low

Level

0.8 V

A, B and Shutdown Inputs High

Level

2.0 V

A, B Input Current Low V

A,B = 0.4V -1 -0.6 mA

A, B Input Current High V

A,B = 2.4V -200 50 µA

A, B Input Leakage Current High V

A,B = 35.3V 200 µA

Shutdown Input Current Low V

SHUTDOWN = 0.4V 20 100 µA

Shutdown Input Current High V

SHUTDOWN = 2.4V 170 500 µA

SHUTDOWN = 6.2V 0.6 1.5 mA

Enable Input Current Low V

ENABLE = 0V -600 -460 200 µA

Enable Input Current High V

ENABLE = 6.2V 200 µA

Enable Threshold Rising 2.8 3.6 V

Enable Threshold Falling 1.0 2.4 3.4 V

Output High Sat., V

IN -VOUT IOUT = -50mA 2.0 V

OUT = -500mA 2.5 V

Output Low Sat., V

OUT IOUT = 50mA 0.5 V

OUT = 500mA 2.5 V

Thermal Shutdown 155 °C

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, V

=10V to 35V, and these specifications apply

for: –55

C<TA<125

C for the UC1708, –25

C<TA<+85

C for the UC2708, and 0

C<TA<70

C for the UC3708.TA =TJ.

Part #	C-2708
Description	Power Transformer 1500Vrms Wire Lead Flange Mount
Category	TRANSFORMER
Availability	In Stock
Qty	1

C-2708

Related Items

Technical Document