Datasheet

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