TL494
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS074E – JANUARY 1983 – REVISED FEBRUARY 2005
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Electrical Characteristics
over recommended operating free-air temperature range, V
CC
= 15 V, f = 10 kHz (unless otherwise noted)
Reference Section
PARAMETER
Output voltage (REF)
Input regulation
Output regulation
Output voltage change with temperature
Short-circuit output current
(3)
(1)
(2)
(3)
TEST CONDITIONS
(1)
I
O
= 1 mA
V
CC
= 7 V to 40 V
I
O
= 1 mA to 10 mA
∆T
A
= MIN to MAX
REF = 0 V
TL494C, TL494I
MIN TYP
(2)
4.75
5
2
1
2
25
MAX
5.25
25
15
10
UNIT
V
mV
mV
mV/V
mA
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
All typical values, except for parameter changes with temperature, are at T
A
= 25°C.
Duration of short circuit should not exceed one second.
Oscillator Section
C
T
= 0.01
µF,
R
T
= 12 kΩ (see Figure 1)
PARAMETER
Frequency
Standard deviation of
frequency
(3)
All values of V
CC
, C
T
, R
T
, and T
A
constant
V
CC
= 7 V to 40 V, T
A
= 25°C
∆T
A
= MIN to MAX
Frequency change with voltage
Frequency change with temperature
(4)
(1)
(2)
(3)
TEST CONDITIONS
(1)
TL494C, TL494I
MIN TYP
(2)
10
100
1
10
MAX
UNIT
kHz
Hz/kHz
Hz/kHz
Hz/kHz
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
All typical values, except for parameter changes with temperature, are at T
A
= 25°C.
Standard deviation is a measure of the statistical distribution about the mean as derived from the formula:
N
(x
n
*
X)
2
s
+
(4)
n+1
N
*
1
Temperature coefficient of timing capacitor and timing resistor are not taken into account.
Error-Amplifier Section
See Figure 2
PARAMETER
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 (FEEDBACK)
Output source current (FEEDBACK)
(1)
TEST CONDITIONS
V
O
(FEEDBACK) = 2.5 V
V
O
(FEEDBACK) = 2.5 V
V
O
(FEEDBACK) = 2.5 V
V
CC
= 7 V to 40 V
∆V
O
= 3 V, V
O
= 0.5 V to 3.5 V, R
L
= 2 kΩ
V
O
= 0.5 V to 3.5 V, R
L
= 2 kΩ
∆V
O
= 40 V, T
A
= 25°C
V
ID
= –15 mV to –5 V, V (FEEDBACK) = 0.7 V
V
ID
= 15 mV to 5 V, V (FEEDBACK) = 3.5 V
65
0.3
–2
–0.3 to
V
CC
– 2
70
95
800
80
0.7
TL494C, TL494I
MIN TYP
(1)
2
25
0.2
MAX
10
250
1
UNIT
mV
nA
µA
V
dB
kHz
dB
mA
mA
All typical values, except for parameter changes with temperature, are at T
A
= 25°C.
4
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