UC1724_08 [TI]
Isolated Drive Transmitter;
| 型号： | UC1724_08 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | Isolated Drive Transmitter |
| 文件： | 总4页 (文件大小：267K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UC1724
UC2724
UC3724
Isolated Drive Transmitter
FEATURES
DESCRIPTION
• 500mA Output Drive, Source or Sink
The UC1724 family of Isolated Drive Transmitters, along with the UC1725
Isolated Drivers, provide a unique solution to driving isolated power
MOSFET gates. They are particularly suited to drive the high-side devices
on a high-voltage H-bridge. The UC1724 devices transmit drive logic, and
drive power, to the isolated gate circuit using a low cost pulse transformer.
• 8 to 35V Operation
• Transmits Logic Signal Instantly
• Programmable Operating Frequency
• Under-Voltage Lockout
This drive system utilizes a duty-cycle modulation technique that gives in-
stantaneous response to the drive control transistions, and reliably passes
steady-state, or DC, conditions. High frequency operation, up to 600kHz,
allows the cost and size of the coupling transformer to be minimized.
• Able To Pass DC Information Across
Transformer
These devices will operate over an 8 to 35 Volt supply range. The dual high
current totem pole outputs are disabled by an uder-voltage lockout circuit to
prevent spurious responses during startup or low voltage conditions.
• Up To 600kHz Operation
These devices are available in 8 pin plastic or ceramic dual-inline pack-
ages, as well as 16 pin SOIC package.
BLOCK DIAGRAM
UDG-92037
Note: Pin numbers refer to DIL-8 packages.
04/99
UC1724
UC2724
UC3724
CONNECTION DIAGRAMS
ABSOLUTE MAXIMUM RATINGS
Supply Voltage VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Source/Sink Current (Pulsed) . . . . . . . . . . . . . . . . . . . . . . . . 1A
Source/Sink Current (Continuous) . . . . . . . . . . . . . . . . . . . 0.5A
DIL-8 (Top View)
J Or N Package
+
Ouput Voltage (Pins 4, 6). . . . . . . . . . . . . . . –0.3 to (VIN 0.3)V
PHI, RT, and CT inputs (Pins 1, 7, and 8) . . . . . . . . . –0.3 to 6V
Operating Junction Temperature (Note 2) . . . . . . . . . . . . 150°C
Storage Temperature Range . . . . . . . . . . . . . . –65°C to 150°C
Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . 300°C
Note 1: All voltages are with respect to GND (Pin 2); all cur-
rents are positive into, negative out of part.
Note 2: Consult Unitrode Integrated Circuit Databook for ther-
mal limitations and considerations of package.
Note 3: Pin numbers refer to DIL-8 packages.
SOIC-16 (Top View)
DW Package
RECOMMENDED OPERATION CONDITIONS
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +9V to +35V
Sink/Source Load Current (each output). . . . . . . . . 0 to 500mA
Timing Resistor. . . . . . . . . . . . . . . . . . . . . . . . . . . 2kW to 10kW
Timing Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . 300pF to 3nF
Operating Temperature Range (UC1724) . . . –55°C<TA<125°C
Operating Temperature Range (UC3724) . . . . . . 0°C<TA<70°C
Note 4: Range over which the device is functional and
parameter limits are guaranteed.
ORDERING INFORMATION
TEMPERATURE RANGE
–55°C to +125°C
PACKAGE
CDIP
UC1724J
UC2724DW
UC2724N
UC3724DW
UC3724N
–25°C to +85°C
SOIC-Wide
PDIP
0°C to +70°C
SOIC-Wide
PDIP
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, VCC = 20V, RT = 4.3kΩ, CT = 1000pF, no load on any
output and these specifications apply for: –55oC < TA < 125oC for the UC1724, –25oC < TA < 85oC for the UC2724, and
0oC < TA < 70oC for the UC3724. TA=TJ.
PARAMETER
Under-Voltage Lockout
TEST CONDITIONS
MIN
TYP
MAX UNITS
Start-Up Threshold
Threshold Hysteresis
Retriggerable One-Shot
Initial Accuracy
V
IN Rising
7.75
1.0
9.5
1.5
V
V
0.4
TJ = 25°C
1.54
1.0
1.9
2.25
2.9
µs
µs
Temperature Stability
Voltage Stability
Over Operating TJ
VIN = 10 to 35V
0.2
0.5
%/V
kHz
ns
Operating Frequency
Minimum Pulse Width
Operating Frequency
LLOAD = 1.4mH
100
100
500
150
500
750
200
1200
1100
RT = 2k CT = 300pF
RT = 2k CT = 300pF LLOAD = 1.4mH
kHz
2
UC1724
UC2724
UC3724
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, VCC = 20V, RT = 4.3kΩ, CT = 1000pF, no load on any
output and these specifications apply for: –55oC < TA < 125oC for the UC1724, –25oC < TA < 85oC for the UC2724, and
0oC < TA < 70oC for the UC3724. TA=TJ.
PARAMETER
Phi Input (Control Input)
TEST CONDITIONS
MIN
TYP
MAX UNITS
HIGH Input Voltage
LOW Input Voltage
HIGH Input Current
LOW Input Current
Delay to One-Shot
Delay to Output
2.0
V
0.8
V
+
VIH
VIL
=
=
2.4V
–220 –130
–600 –300
µA
µA
ns
ns
+
0.4V
350
250
Output Drivers
Output Low Level
ISINK = 50mA
0.3
0.5
1.5
1.7
30
0.4
2.1
2.1
2.5
90
V
V
ISINK = 250mA
ISOURCE = 50 mA
ISOURCE = 250 mA
No load
Output High Level (Volts Below VCC
)
V
V
Rise/Fall Time
Total Supply Current
Supply Current
ns
CT = 1.4V
15
30
mA
Additional Information
Please refer to the following Unitrode application topics.
[1] Application Note U-127, Unique Chip Pair Simplified
Isolated High-Side Switch Drive by John A. O’Connor.
[2] Design Note DN-35, IGBT Drive Using MOSFET Gate
Drivers by John A. O’Conner.
UDG-92038
Figure 1. Typical application
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 FAX (603) 424-3460
3
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