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参数资料
| 型号： | TS2951ACS-5.0 |
| 厂商： | Taiwan Semiconductor Co., Ltd. |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
| 中文描述： | 5.0放大器正电压稳压器 |
| 文件页数： | 4/6页 |
| 文件大小： | 134K |
| 代理商： | TS2951ACS-5.0 |
TS2950-51 series
4-6
2003/12 rev. B
Application Hints
External Capacitors
For the stability of the TS2950/A & TS2951/A is requires
a 1.0uF(0.22uF is recommended for 3.0V & 3.3V) or
greater capacitor between output and ground. Oscillation
could occur without this capacitor. The tantalum or
aluminum electrolytic works fine; could use the film type
work but are not cost efficient. For the operation of below
-25
o
C solid tantalum is recommended since the many
aluminum type have electrolytes the freeze at about -30
o
C. The ESR of about 5
or less and resonant frequency
above 500KHz are most important parameter in the value
of Capacitor. The Capacitors value can be increased
without any limit. At lower values of output current, less
output capacitance is required for stability. For the
currents below 10mA the value of capacitor can be
reduce to 0.33uF and 0.1uF for 1mA. More output
capacitance needed for the 8-pin version at voltage
below 5V since it runs the error amplifier at lower gain. At
worst case 3.3uF or greater must be used for condition of
100mA load at 1.250V output.
The TS2950/A & TS2951/A is not like other low dropout
regulators will remain stable and regulation with no load
in addition to the internal voltage divider. This feature
very important in application, it is like CMOS RAM
keep-alive. The TS2951/A output voltage is set with
minimum load of 1uA and external resistors.
If at the input of TS2950/A & TS2951/A connected to
battery or between AC filter capacitor and input is 10
inches wire then 1uF tantalum or aluminum electrolytic
capacitor should be connected between input and
ground. Instability can occur if stray capacitor to feedback
terminal pin 7 of the TS2951/A. This could cause more
problems when using higher value of external to set the
output voltage. To fix this problem the 100pF capacitor
between output and feedback and increasing output
capacitance to 3.3uF.
Reducing Output Noise
It could be an advantage to reduce the AC noise present
at the output. One method is to reduce the regulator
bandwidth by increasing the value of the output
capacitor. This is the only method that noise could
reduce on the TS2950/A & TS2951/A, but is relatively
inefficient, as increasing capacitor from 1uF to 220uF
only decreases the noise from 430uV to 160uVrms for a
100KHz bandwidth at 5V output. Noise could be also
reduced by fourfold by a bypass capacitor across R1
since it reduces the high frequency gain from 4 to unity.
Pick Cbypass= 1 / 2
π
R1
* 200Hz or choose 0.01uF
when doing this, the output capacitor must be increased
to 3.3uF to maintain stability. These change the output
noise from 430uV/rms for a 100 kHz bandwidth 5V,
3.3V & 3V output. With the bypass capacitor added,
noise no longer scales with output voltage so that
improvements are more dramatic higher output voltage.
Error Detection Comparator Output
The Compactor produces a logic low output whenever
the TS2951/A output falls of regulation by more than
around 5%. This is around 60 mV offset divided by the
1.235 reference voltage. Thus trip remains 5% below
nominal regardless of the programmed output voltage
of the regulator. The Figure 1 shows the timing diagram
depicting the ERROR signal and the regulator output
voltage as the TS2951/A input is ramped up and down.
The ERROR signal becomes low at around 1.3V input,it
goes high around 5V input (input voltage at which
Vout=4.75V). The TS2951/A dropout voltage depending
on the load, the input voltage trip point around 5V will
vary with load current. The output voltage trip point is
around 4.75V, it does not change with load. The error
comparator has an open-collector output which requires
an external pull-up resistor. Depending on the system
requirement, the resistor maybe returned to 5 or 3.3V
output or other supply voltage depending to the system
requirements. For determining the size of the resistor,
note that the output is sinking 400uA, this value adds to
battery drain in a low better condition, recommended
values 100K to 1M
. If the output is unused this
resistor is not required.
Figure 1. Error Output Timing
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