TL494_101 Datasheet, PDF (4/19 Pages) Texas Instruments – PULSE-WIDTH-MODULATION CONTROL CIRCUITS

TL494
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS074E – JANUARY 1983 – REVISED FEBRUARY 2005
www.ti.com
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⁾
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⁾ MAX
4.75
5 5.25
2
25
1
15
2
10
25
(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.
UNIT
V
mV
mV
mV/V
mA
Oscillator Section
C_T = 0.01 µF, R_T = 12 kΩ (see Figure 1)
PARAMETER
TEST CONDITIONS⁽¹⁾
TL494C, TL494I
MIN TYP⁽²⁾ MAX
Frequency
Standard deviation of frequency⁽³⁾
Frequency change with voltage
Frequency change with temperature⁽⁴⁾
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
10
100
1
10
(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:
Ǹ^ȍ _{s +}
N
(x_n * X)²
n+1
N*1
(4) Temperature coefficient of timing capacitor and timing resistor are not taken into account.
UNIT
kHz
Hz/kHz
Hz/kHz
Hz/kHz
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)
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
TL494C, TL494I
MIN TYP⁽¹⁾ MAX
2
10
25 250
0.2
1
–0.3 to
V_CC – 2
70
95
800
65
80
0.3 0.7
–2
UNIT
mV
nA
µA
V
dB
kHz
dB
mA
mA
(1) All typical values, except for parameter changes with temperature, are at T_A = 25°C.
4