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参数资料
| 型号： | TLC555CDBR |
| 厂商： | Texas Instruments, Inc. |
| 元件分类： | 定时器 |
| 英文描述： | LinCMOSE TIMERS |
| 中文描述： | LinCMOSE定时器 |
| 文件页数： | 10/19页 |
| 文件大小： | 404K |
| 代理商： | TLC555CDBR |
SLFS043F SEPTEMBER 1983 REVISED FEBRUARY 2005
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Connecting TRIG to THRES, as shown in Figure 3, causes the timer to run as a multivibrator. The capacitor C
T
charges through R
A
and R
B
to the threshold voltage level (approximately 0.67 V
DD
) and then discharges through R
B
only to the value of the trigger voltage level (approximately 0.33 V
DD
). The output is high during the charging cycle
(t
c(H)
) and low during the discharge cycle (t
c(L)
). The duty cycle is controlled by the values of R
A
, R
B
, and C
T
as shown
in the equations below.
tc(H)
tc(L)
Period
CT(RA
CTRBIn 2
tc(H)
RB) In 2 (In 2
0.693)
tc(L)
CT(RA
tc(L)
tc(H)
2RB) In 2
Output driver duty cycle
tc(L)
tc(H)
1 –
RB
RA
2RB
Output waveform duty cycle
tc(H)
tc(L)
RB
RA
2RB
The 0.1-
μ
F capacitor at CONT in Figure 3 decreases the period by about 10%.
The formulas shown above do not allow for any propagation delay times from the TRIG and THRES inputs to DISCH.
These delay times add directly to the period and create differences between calculated and actual values that
increase with frequency. In addition, the internal on-state resistance r
on
during discharge adds to R
B
to provide
another source of timing error in the calculation when R
B
is very low or r
on
is very high.
The equations below provide better agreement with measured values.
tc(H)
CT(RA
RB) In
3 –exp
–tPLH
CT(RB
ron)
tPHL
tc(L)
CT(RB
ron) In
3 –exp
–tPHL
CT(RA
RB)
tPLH
These equations and those given earlier are similar in that a time constant is multiplied by the logarithm of a number
or function. The limit values of the logarithmic terms must be between In 2 at low frequencies and In 3 at extremely
high frequencies. For a duty cycle close to 50%, an appropriate constant for the logarithmic terms can be substituted
tc(H)
tc(H)
conditions can be difficult to obtain.
with good results. Duty cycles less than 50%
tc(L)
require that tc(H)
tc(L)
<1 and possibly R
A
≤
r
on
. These
In monostable applications, the trip point on TRIG can be set by a voltage applied to CONT. An input voltage between
10% and 80% of the supply voltage from a resistor divider with at least 500-
μ
A bias provides good results.
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