© Semiconductor Components Industries, LLC, 2005
June, 2005 − Rev. 6
1 Publication Order Number:
TL494/D
TL494, NCV494
SWITCHMODE™ Pulse 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 V
CC
42 V
Collector Output Voltage V
C1
,
V
C2
42 V
Collector Output Current
(Each transistor) (Note 1)
I
C1
, I
C2
500 mA
Amplifier Input Voltage Range V
IR
−0.3 to +42 V
Power Dissipation @ T
A
≤ 45°C P
D
1000 mW
Thermal Resistance, Junction−to−Ambient
R
q
JA
80 °C/W
Operating Junction Temperature T
J
125 °C
Storage Temperature Range T
stg
−55 to +125 °C
Operating Ambient Temperature Range
TL494B
TL494C
TL494I
NCV494B
T
A
−40 to +125
0 to +70
−40 to +85
−40 to +125
°C
Derating Ambient Temperature T
A
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.
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
http://onsemi.com
MARKING
DIAGRAMS
SOIC−16
D SUFFIX
CASE 751B
See detailed ordering and shipping information in the package
dimensions section on page 4 of this data sheet.
ORDERING INFORMATION
TL494xDG
AWLYWW
x = B, C or I
A = Assembly Location
WL = Wafer Lot
YY, Y = Year
WW, W = Work Week
G = Pb−Free Package
1
16
PDIP−16
N SUFFIX
CASE 648
*This marking diagram also applies to NCV494
PIN CONNECTIONS
C
T
R
T
Ground
C1
1
Inv
Input
C2
Q2
E2
E1
1
≈ 0.1 V
Oscillator
V
CC
5.0 V
REF
(Top View)
Noninv
Input
Inv
Input
V
ref
Output
Contro
l
V
CC
Noninv
Input
Compen/PWN
Comp Input
Deadtime
Control
Error
Amp
+
−
2
3
4
5
6
7
89
10
11
12
13
14
15
16
2
Error
Amp
+
−
Q1
TL494xN
AWLYYWWG
*
1
16