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参数资料
| 型号： | TL494MJB |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.25 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, CDIP16 |
| 封装： | CERAMIC, DIP-16 |
| 文件页数： | 16/21页 |
| 文件大小： | 620K |
| 代理商： | TL494MJB |
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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, VCC = 15 V, f = 10 kHz (unless otherwise noted)
TL494C, TL494I
PARAMETER
TEST CONDITIONS(1)
UNIT
MIN TYP(2)
MAX
Output voltage (REF)
IO = 1 mA
4.75
5
5.25
V
Input regulation
VCC = 7 V to 40 V
2
25
mV
Output regulation
IO = 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 TA = 25°C.
(3)
Duration of short circuit should not exceed one second.
C
TL494C, TL494I
PARAMETER
TEST CONDITIONS(1)
UNIT
MIN TYP(2)
MAX
Frequency
10
kHz
Standard deviation of frequency(3)
All values of VCC, CT, RT, and TA constant
100
Hz/kHz
Frequency change with voltage
VCC = 7 V to 40 V, TA = 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 TA = 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
VO (FEEDBACK) = 2.5 V
2
10
mV
Input offset current
VO (FEEDBACK) = 2.5 V
25
250
nA
Input bias current
VO (FEEDBACK) = 2.5 V
0.2
1
A
–0.3 to
Common-mode input voltage range
VCC = 7 V to 40 V
V
VCC – 2
Open-loop voltage amplification
V
O = 3 V, VO = 0.5 V to 3.5 V, RL = 2 k
70
95
dB
Unity-gain bandwidth
VO = 0.5 V to 3.5 V, RL = 2 k
800
kHz
Common-mode rejection ratio
V
O = 40 V, TA = 25°C
65
80
dB
Output sink current (FEEDBACK)
VID = –15 mV to –5 V, V (FEEDBACK) = 0.7 V
0.3
0.7
mA
Output source current (FEEDBACK)
VID = 15 mV to 5 V, V (FEEDBACK) = 3.5 V
–2
mA
(1)
All typical values, except for parameter changes with temperature, are at TA = 25°C.
4
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