LINEAR INTEGRATED CIRCUIT VOLTAGE MODE CONTROL CIRCUIT Conte

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LINEAR INTEGRATED CIRCUIT VOLTAGE MODE CONTROL CIRCUIT Conte

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TL494
LINEAR INTEGRATED CIRCUIT
VOLTAGE MODE CONTROL CIRCUIT
Contek TL494 incorporates functions required construction pulse-width modulation switching circuit. Designed primarily switching power supply control DCDC convectors, offers systems engineer flexibility tailor control circuitry application.
SOP-16
*Complete power control circuitry *Uncommitted outputs sink source current *Output control selects single ended push pull operation *Internal circuitry prohibits double pulses over total range *Easy synchronization
FEATURES
DIP-16
ABSOLUTE MAXIMUM RATINGS (Unless otherwise noted over operating free temperature
range)
PARAMETER
Supply Voltage(note Amplifier Input Voltage Collector Output Voltage Collector Output Current Continuous Total Dissipation at(or below) Free Temperature(note Operating Temperature Range Storage Temperature Range Lead Temperature 1.6mm from Case Sec.
SYMBOL
Topr Tstg Tcase
VALUE
VCC+0.3 1000
UNIT
note voltage values, except differential voltages with respect network ground terminal. note 2:For operation above free-air temperature, dissipation derates with 9.2mW/
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
TL494
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
Pulse Steering Flip-Flop Input control
oscillator
Vref
dead time comparator
dead time control comparator 0.7mA reference regulation
Error Amplifier Error Amplifier
RECOMMENDED OPERATING CONDITIONS
PARAMETER SYMBOL
fosc
VALUE
Vcc-2 10000 -0.3
UNIT
Supply Voltage Amplifier Input Voltage Collector Output Voltage Collector Output Current(each Transistor) Current into Feedback Timing Capacitor Timing Resistor Oscillator Frequency Operating Free-Air Temperature
0.47
ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range,VCC=15V,f=1kHz,Unless otherwise specified) PARAMETER TEST CONDITIONS UNIT Reference Section
Output Voltage Input Regulation Output Regulation Output Voltage Change with Temperature Short-Circuit Output Current Io=1mA Vcc=7V Io=1 10mA DTA=MIN MAX(note Vref=0 CT=0.01mF,R T=120kW 4.75 5.25
Oscillator Section
Frequency
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
TL494
PARAMETER
Standard Deviation Frequency Frequency Change with Voltage Frequency Change with Temperature
LINEAR INTEGRATED CIRCUIT
TEST CONDITIONS
Values constant Vcc=7v 40V,Ta=25 CT=0.01mF,R T=12kW,DTA=MIN Error Vo(pin 3)=2.5V Vo(pin 3)=2.5V Vo(pin 3)=2.5V Vcc=7V DVo=3V, Vo=0.5V 3.5V Error Vcc=40V,T A=25 VID=-15mV V(pin 3)=0.5V VID=15mV V(pin 3)=3.5V VCE=40V,Vcc=40V VCC=VC=40V,V VE=0,Ic=200mA Vc=15V,I E=-200mA Vi=Vref Vi=0 5.25V VI(pin 40=0 Zero duty Cycle Maximum duty cycle Zero Duty cycle Vpin 0.7V Vcc=15V Vcc=40V Vref,all other Inputs outputs open Vpin 4=2V
UNIT
Amplifier Section
Input Offset Voltage Input Offset Current Input Bias Current Common-Mode Input Voltage Range Open-Loop Voltage Amplification Unity-Gain Bandwidth Common-Mode Rejection Ratio Output Sink Current(pin Output source Current(pin -0.3 Vcc-2 -100
Error
Output Section
Collector off-state current Emitter off-state Current Collector -emitter Saturation Voltage
Commonemitter EmitterFollower
Output Control Input Current
Dead Time Control Section
Input bias (pin Maximum duty cycle, each output Input threshold Voltage(pin
comparator Section
Input Threshold Voltage(pin Input Sink Current (pin
Total Device
Standby Supply Current
Average supply current
Switching Characteristics,Ta=25
Output Voltage Rise Time Common-emitter configuration Output Voltage Fall Time Output Voltage Rise Time Emitter-follower configuration Output Voltage Fall Time note 1:All typical Values except temperature coefficient Ta=25 note 2:For conditions shown MAX, appropriate value under recommended operating conditions. note 3:Duration short-circuit should exceed second.
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
TL494
LINEAR INTEGRATED CIRCUIT
(xn-x)
note Standard deviation measure statistical distribution mean derived from formula
SN-1
TEST CIRCUIT
Vcc=15V
TEST INPUTS
12kW
Contek
0.01
DEAD-TIME FEEDBACK
OUTPUT
OUTPUT
ERROR AMPLIFIER Vref OUTPUT
OUTPUT CONTROL
50kW
VOLTAGE
VOLTAGE
VOLTAGE DEAD-TIME CONTROL INPUT
THRESHOLD VOLTAGE
THRESHOLD VOLTAGE
FEEDBACK
OPERATIONAL TEST CIRCUIT WAVEFORMS
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
TL494
LINEAR INTEGRATED CIRCUIT
Vref ERROR AMPLIFIER
FEEDBACK TERMINAL
ERROR AMPLIFIER
AMPLIFIER CHARACTERISTICS
EACH OUTPUT CIRCUIT
15pF
EACH OUTPUT CIRCUIT
15pF
FIG. COMMON-EMITTER CONFIGURATION
FIG. EMITTER -FOLLOWER CONFIGURATION
CONFIGURATIONS
NONINV INPUT INPUT FEEDBACK DEAD-TIME CONTROL NONINV INPUT INPUT
Vref
OUTPUT CONTROL
Contek TL494
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
TL494
LINEAR INTEGRATED CIRCUIT
TYPICAL PERFORMANCE CHARACTERISTICS
Vcc=15V Ta=0~70
CT=0.001 Vcc=15V DV=3V Ta=25
Oscillator Frequency (Hz)
Voltage Amplification (dB)
CT=0.01
CT=0.1
CT=1
RT(Timing Resistance)
Frequency (Hz)
Oscillator Frequency Frequency Variation Timing Resistance
Fig.6 Amplifier Voltage Amplification
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com

LINEAR INTEGRATED CIRCUIT VOLTAGE MODE CONTROL CIRCUIT Conte

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