TI UC2950

UC2950
Half-Bridge Bipolar Switch
FEATURES
DESCRIPTION
•
Source or Sink 4.0A
•
Supply Voltage to 35V
•
High-Current Output Diodes
•
Tri-State Operation
This device is a monolithic integrated circuit designed 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 built-in interlock will keep the sink off if the source is
on.
•
TTL and CMOS Input Compatibility
•
Thermal Shutdown Protection
•
300kHz Operation
•
Low-Cost TO-220 Package
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, bipolar motor driver compatible with high frequency chopper
current control.
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage Range, VC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8V to 35V
Output Voltage Range, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -3.0V to VC+3V
Input Voltage Range, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +7.0V
Peak Output Current (100 ms, 10% DC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±4.0A
Continuous Output Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±2.0A
Power Dissipation with Heat Sink. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15W
Power Dissipation in Free Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2W
Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . -20°C to +100°C
Storage Temperature Range, TS . . . . . . . . . . . . . . . . . . . . . . . . . -55°C to +125°C
Note 1: Consult Packaging section of databook for thermal limitations and considerations of package.
CONNECTION DIAGRAM
TRUTH TABLE
5-PIN TO-220 (TOP VIEW)
T Package
Source Drive
Pin 2
Low
Low
High
High
Sink Drive
Pin 5
Low
High
Low
High
Output
Pin 4
Low
Off
High
High
Note: With no load, output voltage will be HIGH in the OFF
state.
SIMPLIFIED SCHEMATIC
5/93
UC2950
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, VC = 35V, TA = -20°C to +100°C, VIL = 0.8V, VIH = 2.4V
PARAMETERS
Output Leakage to VC
Output Leakage to Ground
Output Sink Saturation
Output Source Saturation
Sink Diode Forward Voltage
Source Diode Forward Voltage
Input Current
Supply Current
for either input, TA =TJ.
TEST CONDITIONS
Output Off
Output Off
VOL, IL = 2.0A
(VC-VOL), IL = -2.0A
ID = -2.0A
ID = 2.0A
Either Input, VI = 5V
Either Input, VI = 0V
Output High
Output Low
MIN
TYP
20
-200
1.2
1.2
1.4
1.4
20
-1.0
20
10
MAX UNITS
500
µA
-500
µA
2.0
V
2.0
V
2.0
V
2.0
V
100
µA
-1.6
mA
30
mA
20
mA
SWITCHING CHARACTERISTICS: See Test Circuit. VC = 12V, RL = 5Ω, TA = 25°C. Guaranteed by design, not 100%
tested in production.
PARAMETERS
Source Turn-On Delay, tD1
Source Turn-Off Delay, tD2
Sink Turn-On Delay, tD3
Sink Turn-Off Delay, tD4
Cross-Conduction Current Spike When Source
and Sink are Activated Together
MIN
SWITCHING TEST CIRCUIT
UNITRODE INTEGRATED CIRCUITS
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 • FAX (603) 424-3460
2
TYP
300
1.0
200
100
0.6
MAX UNITS
500
ns
2.0
µs
400
ns
300
ns
1.0
µs
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