UC1706 [TI]
Dual Output Driver; 双路输出驱动器
| 型号： | UC1706 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | Dual Output Driver |
| 文件： | 总6页 (文件大小：279K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UC1706
UC2706
UC3706
Dual Output Driver
FEATURES
DESCRIPTION
•
•
•
•
•
Dual, 1.5A Totem Pole Outputs
40nsec Rise and Fall into 1000pF
Parallel or Push-Pull Operation
Single-Ended to Push-Pull Conversion
The UC1706 family of output drivers are made with a high-speed
Schottky process to interface between low-level control functions and
high-power switching devices - particularly power MOSFET's. These de-
vices implement three generalized functions as outlined below.
First: They accept a single-ended, low-current digital input of either polar-
ity and process it to activate a pair of high-current, totem pole outputs
which can source or sink up to 1.5A each.
High-Speed, Power MOSFET
Compatible
Second: They provide an optional single-ended to push-pull conversion
through the use of an internal flip-flop driven by double-pulse-
suppression logic. With the flip-flop disabled, the outputs work in parallel
for 3.0A capability.
•
•
•
•
•
•
•
•
Low Cross-Conduction Current Spike
Analog, Latched Shutdown
Internal Deadband Inhibit Circuit
Low Quiescent Current
Third: Protection functions are also included for pulse-by-pulse current
limiting, automatic deadband control, and thermal shutdown.
These devices are available in a two-watt plastic “bat-wing” DIP for op-
eration over a 0°C to 70°C temperature range and, with reduced power,
in a hermetically sealed cerdip for -55°C to +125°C operation. Also avail-
able in surface mount Q and L packages.
5 to 40V Operation
Thermal Shutdown Protection
16-Pin Dual-In-Line Package
20-Pin Surface Mount Package
TRUTH TABLE
OUT = INV and N.I.
OUT = INV or N.I.
INV
N.I
OUT
H
L
H
L
H
H
L
L
H
L
L
L
BLOCK DIAGRAM
10/98
UC1706
UC2706
UC3706
ABSOLUTE MAXIMUM RATINGS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N--Pkg . . . . . . . . . . . .
J--Pkg
Supply Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . 40V . . . . . . . . . . . . . . . . . . 40V
Collector Supply Voltage, VC . . . . . . . . . . . . . . . . . . 40V . . . . . . . . . . . . . . . . . . 40V
Output Current (Each Output, Source or Sink)
Steady--State. . . . . . . . . . . . . . . . . . . . . . . . . . 500mA . . . . . . . . . . . . . . 500mA
Peak Transient. . . . . . . . . . . . . . . . . . . . . . . . . . 1.5A . . . . . . . . . . . . . . . . 1.0A
Capacitive Discharge Energy . . . . . . . . . . . . . . 20 J. . . . . . . . . . . . . . . . . 15 J
Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V . . . . . . . . . . . . . . . . . 5.5V
Analog Stop Inputs . . . . . . . . . . . . . . . . . . . . . . . . . VIN. . . . . . . . . . . . . . . . . . VIN
Power Dissipation at TA = 25°C (See Note) . . . . . . . 2W . . . . . . . . . . . . . . . . . . 1W
Power Dissipation at T (Leads/Case) = 25°C . . . . . . 5W . . . . . . . . . . . . . . . . . . . 2
(See Note)
Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . --55°C to +125°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . --65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . . . . . . . 300°C
Note: All voltages are with respect to the four ground pins which must be connected
together. All currents are positive into, negative out of the specified trerminal. Consult
Packaging sections of the Databook for thermal limitations and considerations of package.
CONNECTION DIAGRAMS
DIL-16, SOIC-16 (TOP VIEW)
J or N Package, DW Package
PLCC-20, LCC-20 (TOP VIEW)
Q, L Packages
Note: All four ground pins must be connected to a common
ground.
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = –55°C to +125°C for
the UC1706, –25°C to +85°C for the UC2706 and 0°C to +70°C for the UC3706; VIN = VC = 20V. TA = TJ.
PARAMETERS
VIN Supply Current
TEST CONDITIONS
MIN
TYP
8
MAX UNITS
VIN = 40V
10
5
mA
mA
mA
V
VC Supply Current
VC Leakage Current
Digital Input Low Level
Digital Input High Level
Input Current
VC = 40V, Outputs Low
4
VIN = 0, VC = 30V, No Load
.05
0.1
0.8
2.2
V
VI = 0
–0.6
.05
–1.0
0.1
mA
mA
Input Leakage
VI = 5V
2
UC1706
UC2706
UC3706
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = –55°C to +125°C for
the UC1706, –25°C to +85°C for the UC2706 and 0°C to +70°C for the UC3706; VIN = VC = 20V. TA = TJ.
PARAMETERS
Output High Sat., VC-VO
TEST CONDITIONS
MIN
TYP
MAX UNITS
IO = -50mA
2.0
V
Output Low Sat., VO
Inhibit Threshold
IO = 50mA
IO = 500mA
VREF = 0.5V
VREF = 3.5V
VREF = 0
0.4
2.5
0.6
3.7
–20
160
–20
V
V
V
V
0.4
3.3
Inhibit Input Current
Analog Threshold
Input Bias Current
Thermal Shutdown
–10
130
–10
155
A
VCM = 0 to 15V
VCM = 0
100
mV
A
°C
TYPICAL SWITCHING CHARACTERISTICS: VIN = VC = 20V, TA = 25°C. Delays measured to 10% output change.
PARAMETERS
From Inv. Input to Output:
Rise Time Delay
TEST CONDITIONS
OUTPUT CL =
UNITS
open
1.0
130
40
2.2
nF
110
20
140
60
ns
10% to 90% Rise
ns
Fall Time Delay
80
90
110
50
ns
90% to 10% Fall
25
30
ns
From N. I. Input to Output:
Rise Time Delay
120
20
130
40
140
60
ns
ns
ns
ns
ns
ns
ns
ns
10% to 90% Rise
Fall Time Delay
100
25
120
30
130
50
90% to 10% Fall
VC Cross-Conduction Current Spike Duration Output Rise
Output Fall
25
0
Inhibit Delay
Inhibit Ref. = 1V, Inhibit Inv. = 0.5 to 1.5V
Stop Non-Inv. = 0V, Stop Inv. = 0 to 0.5V
250
180
Analog Shutdown Delay
CIRCUIT DESCRIPTION
Outputs
Digital Inputs
The totem-pole outputs have been designed to minimize With both an inverting and non-inverting input available,
cross-conduction current spikes while maximizing fast, either active-high or active-low signals may be accepted.
high-current rise and fall times. Current limiting can be These are true TTL compatible inputs—the threshold is
done externally either at the outputs or at the common approximately 1.2V with no hysteresis; and external pull-
VC pin. The output diodes included have slow recovery up resistors are not required.
and should be shunted with high-speed external diodes
when driving high-frequency inductive loads.
Inhibit Circuit
Although it may have other uses, this circuit is included to
Flip/Flop
eliminate the need for deadband control when driving
relatively slow bipolar power transistors. A diode from
each inhibit input to the opposite power switch collector
will keep one output from turning-on until the other has
turned-off. The threshold is determined by the voltage on
pin 15 which can be set from 0.5 to 3.5V. When this cir-
cuit is not used, ground pin 15 and leave 1 and 16 open.
Grounding pin 7 activates the internal flip-flop to alter-
nate the two outputs. With pin 7 open, the two outputs
operate simultaneously and can be paralleled for higher
current operation. Since the flip-flop is triggered by the
digital input, an off-time of at last 200nsec must be pro-
vided to allow the flip/flop to change states. Note that the
circuit logic is configured such that the “OFF” state is de-
fined as the outputs low.
3
UC1706
UC2706
UC3706
CIRCUIT DESCRIPTION (cont.)
use with a 7 to 40V supply; however, with some slight re-
sponse time degradation, it can also be driven from 5V.
When VIN is low, the entire circuit is disabled and no cur-
rent is drawn from VC. When combined with a UC1840
PWM, the Driver Bias switch can be used to supply VIN to
the UC1706. VIN switching should be fast as if VC is
high, undefined operation of the outputs may occur with
VIN less than 5V.
Analog Shutdown
This circuit is included to get a latched shutdown as close
to the outputs as possible, from a time standpoint. With
an internal 130mV threshold, this comparator has a
common-mode range from ground to (VIN – 3V). When
not used, both inputs should be grounded. The time re-
quired for this circuit to latch is inversely proportional to
the amount of overdrive but reaches a minimum of
180nsec. As with the flip-flop, an input off-time of at least
200nsec is required to reset the latch between pulses.
Thermal Considerations
Should the chip temperature reach approximately 155°C,
a parallel, non--inverting input is activated driving both
outputs to the low state.
Supply Voltage
With an internal 5V regulator, this circuit is optimized for
APPLICATIONS
D1, D2; UC3611 Schottky Diodes
D1, D2; UC3611 Schottky Diodes
Power MOSFET Drive Circuit
Power MOSFET Drive Circuit Using Negative Bias Voltage and
Level Shifting to Ground Referenced PWMs
D1, D2: UC3611 Schottky Diodes
Transformer Coupled MOSFET Drive Circuit
Charge Pump Circuits
4
UC1706
UC2706
UC3706
APPLICATIONS (cont'd)
D1, D2: UC3611 Schottky Diodes
D1, D2: UC3611 Schottky Diodes
Transformer Coupled Push-Pull MOSFET Drive Circuit
Power Bipolar Drive Circuit
UC3706 Converts Single Output PWMs to High Current Push-Pull Configuration
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 • FAX (603) 424-3460
5
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Copyright 1999, Texas Instruments Incorporated
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