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TL494
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS074E – JANUARY 1983 – REVISED FEBRUARY 2005
Absolute Maximum Ratings
(1)
over operating free-air temperature range (unless otherwise noted)
MIN
V
CC
V
I
V
O
I
O
Supply voltage
(2)
Amplifier input voltage
Collector output voltage
Collector output current
D package
DB package
θ
JA
Package thermal impedance
(3) (4)
N package
NS package
PW package
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
T
stg
(1)
(2)
(3)
(4)
Storage temperature range
–65
MAX
41
V
CC
+ 0.3
41
250
73
82
67
64
108
260
150
°C
°C
°C/W
UNIT
V
V
V
mA
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating
conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
All voltages are with respect to the network ground terminal.
Maximum power disipation is a function of T
J
(max),
θ
JA
, and T
A
. The maximum allowable power dissipation at any allowable ambient
temperatire is P
D
= (T
J
(max) – T
A
)/θ
JA
. Operating at the absolute maximum T
J
of 150°C can affect reliability.
The package thermal impedance is calculated in accordance with JESD 51-7.
Recommended Operating Conditions
MIN
V
CC
V
I
V
O
Supply voltage
Amplifier input voltage
Collector output voltage
Collector output current (each transistor)
Current into feedback terminal
f
OSC
C
T
R
T
T
A
Oscillator frequency
Timing capacitor
Timing resistor
Operating free-air temperature
TL494C
TL494I
1
0.47
1.8
0
–40
7
–0.3
MAX
40
V
CC
– 2
40
200
0.3
300
10000
500
70
85
UNIT
V
V
V
mA
mA
kHz
nF
kΩ
°C
3
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