TL494_10 Datasheet, PDF (1/14 Pages) Texas Instruments – PULSE-WIDTH-MODULATION CONTROL CIRCUITS

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
Collector Output Voltage
Collector Output Current
(Each transistor) (Note 1)
V_CC
42
V
V_C1,
42
V
V_C2
I_C1, I_C2
500
mA
Amplifier Input Voltage Range
Power Dissipation @ T_A ≤ 45°C
Thermal Resistance, Junction−to−Ambient
Operating Junction Temperature
Storage Temperature Range
Operating Ambient Temperature Range
TL494B
TL494C
TL494I
NCV494B
V_IR
P_D
R_qJA
T_J
T_stg
T_A
−0.3 to +42 V
1000
mW
80
°C/W
125
°C
−55 to +125 °C
°C
−40 to +125
0 to +70
−40 to +85
−40 to +125
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.
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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
C_T 5
R_T 6
Ground 7
+
Error
−Amp
1
≈ 0.1 V
+
2
Error
Amp−
V_CC
5.0 V
REF
Oscillator
Q2
16
Noninv
Input
15
Inv
Input
14 V_ref
13
Output
Contro
l
12 V_CC
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
1
June, 2005 − Rev. 6
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