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PDF TL494 Data sheet ( Hoja de datos )

Número de pieza TL494
Descripción SWITCHMODE PULSE WIDTH MODULATION CONTROL CIRCUIT
Fabricantes ON Semiconductor 
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TL494 motorola TL494CN


1. PWM Control Circuit - Motorola






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TL494, NCV494
SWITCHMODEPulse Width
Modulation Control Circuit
The TL494 is a fixed frequency, pulse width modulation control
circuit designed primarily for SWITCHMODE power supply control.
Features
Complete Pulse Width Modulation Control Circuitry
On−Chip Oscillator with Master or Slave Operation
On−Chip Error Amplifiers
On−Chip 5.0 V Reference
Adjustable Deadtime Control
Uncommitted Output Transistors Rated to 500 mA Source or Sink
Output Control for Push−Pull or Single−Ended Operation
Undervoltage Lockout
NCV Prefix for Automotive and Other Applications Requiring Site
and Control Changes
Pb−Free Packages are Available*
MAXIMUM RATINGS (Full operating ambient temperature range applies,
unless otherwise noted.)
Rating
Symbol Value
Unit
Power Supply Voltage
Collector Output Voltage
Collector Output Current
(Each transistor) (Note 1)
VCC 42 V
VC1, 42 V
VC2
IC1, IC2 500 mA
Amplifier Input Voltage Range
Power Dissipation @ TA 45°C
Thermal Resistance, Junction−to−Ambient
Operating Junction Temperature
Storage Temperature Range
Operating Ambient Temperature Range
TL494B
TL494C
TL494I
NCV494B
VIR
PD
RqJA
TJ
Tstg
TA
−0.3 to +42 V
1000
mW
80 °C/W
125 °C
−55 to +125 °C
−40 to +125
0 to +70
−40 to +85
−40 to +125
°C
Derating Ambient Temperature
TA 45 °C
Maximum ratings are those values beyond which device damage can occur.
Maximum ratings applied to the device are individual stress limit values (not
normal operating conditions) and are not valid simultaneously. If these limits are
exceeded, device functional operation is not implied, damage may occur and
reliability may be affected.
1. Maximum thermal limits must be observed.
http://onsemi.com
MARKING
DIAGRAMS
16
SOIC−16
D SUFFIX
CASE 751B
1
TL494xDG
AWLYWW
16
PDIP−16 *
N SUFFIX
CASE 648
1
TL494xN
AWLYYWWG
x
A
WL
YY, Y
WW, W
G
= B, C or I
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
*This marking diagram also applies to NCV494.
PIN CONNECTIONS
Noninv
Input
1
Inv
Input
2
Compen/PWN
Comp Input
3
Deadtime
Control
4
CT 5
RT 6
Ground 7
+
Error
−Amp
1
0.1 V
+
2
Error
Amp−
VCC
5.0 V
REF
Oscillator
Q2
16
Noninv
Input
15
Inv
Input
14 Vref
13
Output
Contro
l
12 VCC
11 C2
10 E2
C1 8
Q1
9 E1
(Top View)
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2005
June, 2005 − Rev. 6
1
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 4 of this data sheet.
Publication Order Number:
TL494/D

1 page




TL494 pdf
TL494, NCV494
6
RT
5
CT
4
Deadtime
Control
Oscillator
0.12V
0.7V
0.7mA
Deadtime
Comparator
+
+
PWM
Comparator
++
12
−−
Output Control
13
DQ
Flip−
Flop
Ck Q
UV
Lockout
+
+
3.5V
4.9V
Reference
Regulator
12
Error Amp
1
3
Feedback PWM
Comparator Input
15 16
Error Amp
2
14
Ref.
Output
7
Gnd
This device contains 46 active transistors.
Figure 1. Representative Block Diagram
VCC
8
Q1
9
Q2 11
10
12
VCC
Capacitor CT
Feedback/PWM Comp.
Deadtime Control
Flip−Flop
Clock Input
Flip−Flop
Q
Flip−Flop
Q
Output Q1
Emitter
Output Q2
Emitter
Output
Control
Figure 2. Timing Diagram
http://onsemi.com
5

5 Page





TL494 arduino
+Vin = 10V to 40V
TL494, NCV494
Tip 32A
47
150
47k
50 +
50V
12
VCC
CT RT
56
8 11
C1 C2
TL494
D.T. O.C. Gnd E1 E2
4 13 7 9 10
0.1
Comp 3
−2
+1
Vref 14
15
+ 16
0.001
47k
1.0M
5.1k
5.1k
150
1.0mH @ 2A
+VO = 5.0 V
IO = 1.0 A
5.1k
MR850
500 +
10V
+ 50
10V
0.1
Figure 21. Pulse Width Modulated Step−Down Converter
Test
Line Regulation
Load Regulation
Output Ripple
Short Circuit Current
Efficiency
Conditions
Vin = 8.0 V to 40 V
Vin = 12.6 V, IO = 0.2 mA to 200 mA
Vin = 12.6 V, IO = 200 mA
Vin = 12.6 V, RL = 0.1 W
Vin = 12.6 V, IO = 200 mA
Results
3.0 mV 0.01%
5.0 mV 0.02%
40 mV pp P.A.R.D.
250 mA
72%
http://onsemi.com
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