Texas Instruments UC2950T Datasheet

Half-Bridge Bipolar Switch

UC2950

TRUTH TABLE

Source Dri ve

Pin 2

Sink Driv e

Pin 5

Output

Pin 4

Low

Low
High
High

Low

High

Low

High

Low

Off
High
High

Note: With no load, output voltage w ill be HIG H in the OF F

state.

ABSOLUTE MAXI MUM RATING S (Note 1)

Supply Voltage Ra n ge, V C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8V to 35V

Output Voltage Range , V

O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -3.0V to VC+3V

Input Voltage Range, V

IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +7.0 V

Peak Output Cur ren t (100 m s, 10% DC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±4.0A

Continuous Output Curr ent. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±2.0A

Power Dissipation with Heat Sink. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15W

Power Dissipation in Free Air. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2W

Operating Temperature Range, T

A . . . . . . . . . . . . . . . . . . . . . . . -20°C to +100°C

Storage Temperature Range, T

S . . . . . . . . . . . . . . . . . . . . . . . . . -55°C to +125°C

5-PIN TO-220 (TOP VIEW)
T Package

FEATURES

• Source or Sink 4.0A

• Supply Voltage to 35V

• High-Current Output Diodes

• Tri-State Operation

• TTL and CMOS Input Compatibility

• Thermal Shutdown Protection

• 300kHz Operation

• Low-Cost TO-220 Package

DESCRIPTI ON

This device i s a mono lithic integrated circui t designe d to provide high-cur­rent switching with low saturation voltages when activated by low-level logic
signals. Source and sink switches may be independently activated without
regard to timing as a b uilt-in interl ock will keep the sin k off if the source is
on.

This driver has the high current capability to drive large capacitive loads
with fast rise and fall times; but with high-speed internal flyback diodes, it is
also ideal for inductive loads. Two UC2950s can be used together to form
a full bridge, bip olar motor driver compatible with high frequency chopper
current control.

CONNECTION DIAGRAM

SIMPLIFIED SCHEMATIC

Note 1: Consult Packag in g sect ion of dat ­abook for thermal limit atio ns and considera­tions of package.

5/93

SWITCHING CHARACTERI STICS:

PARAMETERS MIN TYP MAX UNITS

Source Turn-On Delay, t

D1 300 500 ns

Source Turn-Off Delay, t

D2 1.0 2.0 µs

Sink Turn-On Delay, t

D3 200 400 ns

Sink Turn-Off Delay, t

D4 100 300 ns

Cross-Conduct ion Curr ent Spike When Source
and Sink are Activated Together

0.6 1.0 µs

ELECTRICAL CHARACTERISTICS:

PARAMETERS TEST CONDITION S MIN TYP MAX UNITS

Output Lea kage to V

C Output Off 20 500 µA

Output Lea kage to Ground Output Off -200 -500 µA
Output Sink Saturation V

OL, IL = 2.0A 1.2 2.0 V

Output Sour ce Saturation (V

C-VOL), IL = -2.0A 1.2 2.0 V

Sink Diode Forward Voltage I

D = -2.0A 1.4 2.0 V

Source Diode Forward Voltage I

D = 2.0A 1.4 2.0 V

Input Current Either Input, V

I

= 5V 20 100 µA

Either Input, V

I = 0V -1.0 -1.6 mA

Supply Current Output High 20 30 mA

Output Low 10 20 mA

UC2950

Unless otherwise stated, VC = 35V, TA = -20°C to +100 °C, V IL = 0.8V, VIH = 2.4V
for either input, TA =TJ.

See Test Circuit. V C = 12V, RL = 5Ω, TA = 25°C. Guarant eed by design , not 100%
tested in production.

SWITCHING TEST CIRCUIT

UNITRODE INTEGRATED CIRCUITS
7 CONTINENTAL BLVD. •• MERRIMACK, NH 03054
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