UC2950
Half-Bridge Bipolar Switch
CONNECTION DIAGRAM
SIMPLIFIED SCHEMATIC
TRUTH TABLE
Source
Drive
Pin 2
Sink Drive
Pin 5
Output
Pin 4
Low
Low
High
High
Low
High
Low
High
Low
Off
High
High
Note: With no load, output voltage will be
HIGH in the OFF state.
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage Range, V
C
. . . . . . . . . . . . . . . . . . . . . 8V to 35V
Output Voltage Range, V
O
. . . . . . . . . . . . . . . . 3.0V to V
C
+3V
Input Voltage Range, V
IN
. . . . . . . . . . . . . . . . . . 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, T
A
. . . . . . . . . 20C to +100C
Storage Temperature Range, T
S
. . . . . . . . . . 55C to +125C
Note 1: Consult Packaging section of databook for thermal
limitations and considerations of package.
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
DESCRIPTION
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 acti-
vated without regard to timing as a built-in interlock will keep the sink 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, bipolar motor driver compatible with high frequency chopper cur-
rent control.
SLUS280A - MAY 1993 - REVISED JULY 2003
2
UC2950
SWITCHING CHARACTERISTICS:
See Test Circuit. V
C
= 12V, R
L
= 5
, T
A
= 25C. Guaranteed by design, not 100% tested
in production.
PARAMETERS
MIN
TYP
MAX
UNITS
Source Turn-On Delay, t
D1
300
500
ns
Source Turn-Off Delay, t
D2
1.0
2.0
s
Sink Turn-On Delay, t
D3
200
400
ns
Sink Turn-Off Delay, t
D4
100
300
ns
Cross-Conduction Current Spike When Source
and Sink are Activated Together
0.6
1.0
s
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, V
C
= 35V, T
A
= -20C to +100C, V
IL
= 0.8V, V
IH
= 2.4V for
either input, T
A
=T
J.
PARAMETERS
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Output Leakage to V
C
Output Off
20
500
A
Output Leakage to Ground
Output Off
200
500
A
Output Sink Saturation
V
OL
, I
L
= 2.0A
1.2
2.0
V
Output Source Saturation
(V
C
-V
OL
), I
L
= 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
A
Either Input, V
I
= 0V
1.0
1.6
mA
Supply Current
Output High
20
36
mA
Output Low
10
20
mA
SWITCHING TEST CIRCUIT
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