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PDF UC3714 Data sheet ( Hoja de datos )
| Número de pieza | UC3714 | |
| Descripción | Complementary Switch FET Drivers | |
| Fabricantes | ETC | |
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К1229КП1Р,КП1Н4/
К1229КП2Р,КП2Н4
(UC3714/UC3715)
Inv № 216
Complementary Switch FET Drivers
February 2001- revised September 2002
DESCRIPTION
These two families of high speed drivers are designed to provide drive waveforms for complementary switches.
Complementary switch configurations are commonly used in synchronous rectification circuits and active clamp/reset circuits,
which can provide zero voltage switching. In order to facilitate the soft switching transitions, independently programmable
delays between the two output waveforms are provided on these drivers. The delay pins also have true zero voltage sensing
capability which allows immediate activation of the corresponding switch when zero voltage is applied. These devices require
a PWM-type input to operate and can be interfaced with commonly available PWM controllers.
In the UC3714 series, the AUX output is inverted to allow driving a p-channel MOSFET. In the UC3715* series the two outputs
are configured in a true complementary fashion.
* The UC3715 series are not produced yet.
FEATURES
• Single Input (PWM and TTL Compatible)
• High Current Power FET Driver, 1.0A Source/2A Sink
• Auxiliary Output FET Driver, 0.5A Source/1A Sink
• Time Delays Between Power and Auxiliary Outputs
Independently Programmable from 50ns to 500 ns
• Time Delay or True Zero-Voltage Operation
Independently Configurable for Each Output
• Switching Frequency to 1MHz
• Typical 50 ns Propagation Delays
• ENBL Pin Activates 220 µA Sleep Mode
• Power Output is Active Low in Sleep Mode
• Synchronous Rectifier Driver
BLOCK DIAGRAM
INPUT 6
T1 7
T2 5
50ns-500ns
50ns-500ns
UC3714
ONLY
BIAS
ENBL 3V
GND
LOGIC
GATES
TIMER
REF
ENBL 8
1.4V
ENABLE
Note: Pin numbers refer to J, N and D packages
Absolute Maximum Ratings
Supply Voltage (low impedance source)
Power Driver
continuous
peak
Power Driver
continuous
peak
Auxiliary Driver
continuous
peak
Auxiliary Driver
continuous
peak
Input Voltage Range
Storage Temperature Range
Operating Junction Temperature (Note 1)
Lead Temperature (Soldering 10 seconds)
VCC
IOH
IOL
IOH
IOL
INPUT, ENBL
20
-200
-1
400
2
-100
-500
200
1
-0.3 to 20
-65 to150
150
300
2 PWR
4 AUX
1 VCC
3 GND
V
mA
A
mA
A
mA
mA
mA
A
V
oC
oC
oC
1 page  
К1229КП1Р,КП1Н4/
К1229КП2Р,КП2Н4
(UC3714/UC3715)
Inv № 216
Complementary Switch FET Drivers
February 2001- revised September 2002
TYPICAL CHARACTERISTICS
VCC
GND
VCC PWM
UC3823,
UC3842,
etc.
GND VREF
UC3714/5
INPUT
VCC
T1 PWR
T2
ENBL
AUX
GND
RT1
RT2
Bypass
Cap
Main
Power
Switch
Auxiliary
ZVS
Switch
UC3714/5
T1 PWR
3.0V THRESHOLD
RT
Figure 1. Typical application with timed delays
Figure 2. Using the timer input for
zero-voltage sensing
VCC
PWM Control
Input Signals
VCC
OUT
PWM
Controller
VPWM
D1
RTO
50k
CTO
0.01µF
RT1
UC3714/5
INPUT
VCC
T1 PWR
T2
ENBL
AUX
GND
RT2
PWR
AUX
Figure 3. Self-actuated sleep mode with the absence of an input PWM signal. Wake up occurs with the first
pulse while turn-off is determined by the (RTO CTO) time constant.
VIN
UC3714/5
VCC
PWR
AUX
GND
C2
C1
Q1 L0
RG
Q2
D0 C0 RL
GND
Figure 4. Using the UC3715 as a complementary synchronous rectifier switch driver with n-channel FETs
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet UC3714.PDF ] | |
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