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UTC TL494
LINEAR INTEGRATED CIRCUIT
VOLTAGE MODE PWM CONTROL CIRCUIT
DESCRIPTION
The UTC TL494 incorporates all the functions required in the construction of a pulse-width modulation switching circuit. Designed primarily for switching power supply control or DCDC convectors, it offers the systems engineer the flexibility to tailor control circuitry to its own application.
SOP-16
FEATURES
*Complete PWM power control circuitry *Uncommitted outputs for 200 mA sink or source current *Output control selects single ended or push pull operation *Internal circuitry prohibits double pulses over total range *Easy synchronization
DIP-16
ABSOLUTE MAXIMUM RATINGS(Unless otherwise noted all is over operating free air temperature
range)
PARAMETER
Supply Voltage(note 1) Amplifier Input Voltage Collector Output Voltage Collector Output Current Continuous Total Dissipation at(or for below) 25C Free Air Temperature(note 2) Operating Temperature Range Storage Temperature Range Lead Temperature 1.6mm from Case for 60 Sec.
SYMBOL
VCC VI VO ICO PD Topr Tstg Tcase
VALUE
41 VCC+0.3 41 250 1000 0 TO 70 -65 TO 150 300
UNIT
V V V mA mW C C C
note 1: All voltage values, except differential voltages are with respect to the network ground terminal. note 2:For operation above 25C free-air temperature, the dissipation derates with 9.2mW/C.
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R103-004,A
UTC TL494
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
Input control
13 8 C1
Pulse Steering Flip-Flop RT
Q T
Q1
6
CT oscillator
5
9 E1 11 C2 10 E2
Q
Q2
dead time comparator
14
Vref 5V reference regulation
4
dead time control PWM comparator 0.7mA
12
Vcc
1 2
Error Amplifier Error Amplifier
16 15
7
GND
3
RECOMMENDED OPERATING CONDITIONS
PARAMETER
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
SYMBOL MIN
Vcc Vi Vo Ic If CT RT fosc Ta 7 -0.3
VALUE MAX
40 Vcc-2 40 200 0.3 10000 500 300 70
UNIT
V V V mA mA nF k kHz C
0.47 1.8 1 0
ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range,VCC=15V,f=1kHz,Unless otherwise specified) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Reference Section
Output Voltage Input Regulation Output Regulation Output Voltage Change with Temperature Short-Circuit Output Current Io=1mA Vcc=7V to 40V Io=1 to 10mA TA=MIN to MAX(note 2) Vref=0 CT=0.01F,RT=120k 4.75 5 2 1 0.2 35 10 5.25 25 15 1 V mV mV % mA kHz
Oscillator Section
Frequency
UTC
UNISONIC TECHNOLOGIES CO., LTD.
2
QW-R103-004,A
UTC TL494
PARAMETER
Standard Deviation of Frequency Frequency Change with Voltage Frequency Change with Temperature
LINEAR INTEGRATED CIRCUIT
TEST CONDITIONS
All Values of Vcc CT, RT, TA constant Vcc=7v to 40V,Ta=25C CT=0.01F,RT=12k,TA=MIN to MAX Error Vo(pin 3)=2.5V Vo(pin 3)=2.5V Vo(pin 3)=2.5V Vcc=7V to 40 V Vo=3V, Vo=0.5V to 3.5V Error Vcc=40V,TA=25C VID=-15mV to -5V V(pin 3)=0.5V VID=15mV to -5V V(pin 3)=3.5V VCE=40V,Vcc=40V VCC=VC=40V,VE=0 VE=0,Ic=200mA Vc=15V,IE=-200mA Vi=Vref Vi=0 to 5.25V VI(pin 40=0 Zero duty Cycle Maximum duty cycle Zero Duty cycle Vpin 3= 0.7V Vcc=15V Vcc=40V pin 6 at Vref,all other Inputs and outputs open Vpin 4=2V -2 45 3 0 4 0.7 4.5 V mA mA 3.3
MIN
TYP
10 0.1
MAX
UNIT
% % %
12
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 3) Output source Current(pin 3) 2 25 0.2 -0.3 to Vcc-2 70 65 0.3 -2 2 1.1 1.5 100 -100 1.3 2.5 3.5 -10 mA A % V 10 250 1 mV nA A V dB kHz dB mA mA A A V
Error
95 800 80 0.7
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 4) Maximum duty cycle, each output Input threshold Voltage(pin 4)
PWM comparator Section
Input Threshold Voltage(pin 3) Input Sink Current (pin 3) 0.3
Total Device
Standby Supply Current 10 6 9 7.5 15 mA
Average supply current
Switching Characteristics,Ta=25C
Output Voltage Rise Time Common-emitter configuration 100 200 ns Output Voltage Fall Time 25 100 ns Output Voltage Rise Time Emitter-follower configuration 100 200 ns Output Voltage Fall Time 40 100 ns note 1:All typical Values except for temperature coefficient are at Ta=25C. note 2:For conditions shown as MIN or MAX, use appropriate value under recommended operating conditions. note 3:Duration of the short-circuit should not exceed one second.
UTC
UNISONIC TECHNOLOGIES CO., LTD.
3
QW-R103-004,A
UTC TL494
N
LINEAR INTEGRATED CIRCUIT
note 4: Standard deviation is a measure of the statistical distribution the mean as derived from the formula :
= N-1
TEST CIRCUIT
2 (xn-x) n=1
Vcc=15V
TEST INPUTS
12 4 3 12k 6 5 0.01 F 1 2 16 15 13
2W 150
2W 150
DEAD-TIME FEEDBACK RT CT
Vcc
C1 E1
8 9
OUTPUT 1
C2 E2
11 10
OUTPUT 2
ERROR AMPLIFIER Vref OUTPUT GND
7
OUTPUT CONTROL
14
50k
VOLTAGE at C1
VOLTAGE at C2
VOLTAGE at CT
DEAD-TIME CONTROL INPUT
THRESHOLD VOLTAGE
THRESHOLD VOLTAGE
FEEDBACK
FIG 1. OPERATIONAL TEST CIRCUIT AND WAVEFORMS
UTC
UNISONIC TECHNOLOGIES CO., LTD.
4
QW-R103-004,A
UTC TL494
LINEAR INTEGRATED CIRCUIT
1 Vin 2 16 Vref 15 ERROR AMPLIFIER FEEDBACK TERMINAL ERROR AMPLIFIER
FIG 2. AMPLIFIER CHARACTERISTICS
Vcc
90% 90% Vc 15pF 10% tr tf 10%
EACH OUTPUT CIRCUIT
68 Q
EACH OUTPUT CIRCUIT
Vcc
90% Q Ve 10% tr tf 10% 90%
68
15pF
FIG. 3
COMMON-EMITTER CONFIGURATION
FIG. 4
EMITTER -FOLLOWER CONFIGURATION
PIN CONFIGURATIONS
NONINV INPUT INV INPUT
1 2
16 15 14 13 12 11 10 9
NONINV INPUT INV INPUT
FEEDBACK 3 DEAD-TIME CONTROL CT RT GND C1
Vref
OUTPUT CONTROL
4 5 6 7 8
Vcc
C2 E2 E1
UTC
UNISONIC TECHNOLOGIES CO., LTD.
5
QW-R103-004,A
UTC TL494
10
5
LINEAR INTEGRATED CIRCUIT
100
TYPICAL PERFORMANCE CHARACTERISTICS
Vcc=15V Ta=0~70XC
80 CT=0.001F Vcc=15V V=3V Ta=25XC
Oscillator Frequency (Hz)
10
Voltage Amplification (dB)
4
60
10
3
CT=0.01F
40
CT=0.1F 10
2
CT=1 F
20
10
1
0
3
10
10
4
10
5
10
6
10
2
10
3
10
4
10
5
10
6
RT(Timing Resistance) ( )
Frequency (Hz)
FIG 5. Oscillator Frequency and Frequency Variation Vs Timing Resistance
Fig.6 Amplifier Voltage Amplification
UTC
UNISONIC TECHNOLOGIES CO., LTD.
6
QW-R103-004,A

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