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参数资料
| 型号： | TS317LCT |
| 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： | 3/6页 |
| 文件大小： | 311K |
| 代理商： | TS317LCT |
Application Information
Basic Circuit Operation
The TS317L is a 3-terminal floating regulator. In
operation, the TS317L develops and maintains a
nominal 1.25V reference (Vref) between its output and
adjustment terminals. This reference voltage is
converted to a programming current (Iprog.) by R
1
(see
Figure 17), and this constant current flows through R
2
to ground. The regulated output voltage is given by:
Vout = Vref ( 1 + R2 / R1 ) + Iadj * R2
Since the current from the adjustment terminal (Iadj)
represents an error term in the equation, the TS317L
was designed to control Iadj to less than 100uA and
keep it constant. To do this, all quiescent operating
current is returned to the output terminal. This imposes
the requirement for a minimum load current. If the load
current is less than this minimum, the output voltage
will rise.
Since the TS317L is a floating regulator, it is only the
voltage differential across the circuit which is important
to performance, and operation at high voltages with
respect to ground is possible.
Figure 1. basic circuit configuration
Load Regulation
The TS317L is capable of providing extremely good
load regulation, but a few precautions are needed to
obtain maximum performance. The current set resistor
connected between the adjustment therminal and the
output terminal (usually 240
) should be tied directly to
the output of the regulator rather than near the load.
This eliminates line drops from appearing effectively in
series with the reference and degrading regulation. For
example, a 15V regulator with 0.05
resistance
between the regulator and load will have a load
regulation due to line resistance of 0.05
x Io.
If the set resistor is connected near the load the
effective line resistance will be 0.05
(1+ R2/R1) or in
this case, 11.5 times worse.
Figure 6 shows the effect of resistance between the
regulator and 240
set resistor.
With the TO-92 package, it is easy to minimize the
resistance from the case of the set resistor, by using
two separate leads to the output pin. The ground of R2
can be returned near the ground of the load to provide
remote ground sensing and improve load regulation.
Figure 2. Regulator with line resistance in
output lead
External Capacitor
An input bypass capacitor is recommended in case the
regulator is more than 6 inches away from the usual
large filter capacitor. A 0.1
μ
F disc or 1
μ
F tantalum
input bypass capacitor (Cin) is recommended to reduce
the sensitivity to input line impedance.
The adjustment terminal may be bypassed to ground to
improve ripple rejection and noice. This capacitor
(Cadj) prevents ripple from being amplified as the
output voltage is increased. With a 10uF bypass
capacitor 80dB ripple rejection is obtainable at any
output level. Increased over 10uF do not appreciably
improve the ripple rejection at frequencies above
120Hz. If the bypass capacitor is used, it is sometimes
necessary to include protection diodes to prevent the
capacitor from discharging through internal low current
paths and damaging the device.
In general, the best type of capacitors to use is solid
tantalum.
Solid
tantalum
impedance even at high frequencies. Depending upon
capacitor construction, it takes about 25uF in aluminum
electrolytic to equal 1uF solid tantalum at high
frequencies. Ceramic capacitors are also good at high
frequencies; but some types have a large
capacitors
have
low
TS317L
3-6
2003/12 rev. A
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相关代理商/技术参数 |
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|---|---|
| TS317LCT A3 | 制造商:SKMI/Taiwan 功能描述:Standard Regulator Pos 1.25V to 37V 0.2A 3-Pin TO-92 Ammo |
| TS317LCTA3 | 制造商:TSC 制造商全称:Taiwan Semiconductor Company, Ltd 功能描述:3-Terminal Adjustable Positive Voltage Regulator |
| TS317LCTB0 | 制造商:TSC 制造商全称:Taiwan Semiconductor Company, Ltd 功能描述:3-Terminal Adjustable Positive Voltage Regulator |
| TS320 | 制造商:BEAVERSWOOD 功能描述:HOLDER SELF-ADH 38X200MM PK50 |
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