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參數(shù)資料
| 型號： | CS5253B-1GDPR5 |
| 英文描述： | Positive Adjustable Voltage Regulator |
| 中文描述： | 積極可調(diào)電壓穩(wěn)壓器 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 93K |
| 代理商： | CS5253B-1GDPR5 |
CS5253B–1
http://onsemi.com
7
APPLICATIONS NOTES
THEORY OF OPERATION
The CS5253B–1 linear regulator provides adjustable
voltages from 1.25 V to 5.0 V at currents up to 3.0 A. The
regulator is protected against short circuits, and includes a
thermal shutdown circuit with hysteresis. The output, which
is current limited, consists of a PNP–NPN transistor pair and
requires an output capacitor for stability. A detailed
procedure for selecting this capacitor is included in the
Stability Considerations section.
V
POWER
Function
The CS5253B–1 utilizes a two supply approach to
maximize efficiency. The collector of the power device is
brought out to the V
POWER
pin to minimize internal power
dissipation under high current loads. V
CONTROL
provides
for the control circuitry and the drive for the output NPN
transistor. V
CONTROL
should be at least 1.0 V greater than
the output voltage. Special care has been taken to ensure that
there are no supply sequencing problems. The output
voltage will not turn on until both supplies are operating. If
the control voltage comes up first, the output current will be
limited to about three milliamperes until the power input
voltage comes up. If the power input voltage comes up first,
the output will not turn on at all until the control voltage
comes up. The output can never come up unregulated.
The CS5253B–1 can also be used as a single supply device
with the control and power inputs tied together. In this mode,
the dropout will be determined by the minimum control
voltage.
Output Voltage Sensing
The CS5253B–1 five terminal linear regulator includes a
dedicated V
SENSE
function. This allows for true Kelvin
sensing of the output voltage. This feature can virtually
eliminate errors in the output voltage due to load regulation.
Regulation will be optimized at the point where the sense pin
is tied to the output.
DESIGN GUIDELINES
Remote Sense
Remote sense operation can be easily obtained with the
CS5253B–1 but some care must be paid to the layout and
positioning of the filter capacitors around the part. The
ground side of the input capacitors on the +5.0 V and +3.3 V
lines and the local V
OUT
–to–ground local output capacitor
on the IC output must be tied close to the ground connected
resistor voltage divider feedback network. The top resistor
of the divider must be connected directly to the V
SENSE
pin
of the regulator. This will establish the stability of the part.
This capacitor–divider resistor connection may then be
connected to ground remotely at the load, giving the ground
portion remote sense operation.
The V
SENSE
line can then be tied remotely at the load
connection, giving the feedback remote sense operation.
The remote sense lines should be Kelvin connected so as to
eliminate the effect of load current voltage drop. An optional
bypass capacitor may be used at the load to reduce the effect
of load variations and spikes.
Figure 19. Remote Sense
CS5253B–1
V
CONTROL
V
POWER
V
OUT
V
SENSE
ADJ
100
μ
F
+5.0 V
+3.3 V
+Load
Optional
GND
R
DIS
R
DIS
+
10
μ
F
+
33
μ
F
+
+
Local
Connections
Remote
Connections
–Load
124
124
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CS5253B-1GDPR5G | 制造商:ON Semiconductor 功能描述: |
| CS5253B-8 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:3.0 A LDO 5-Pin 2.5 V Fixed Linear Regulator for Remote Sense Applications |
| CS5253B-8/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:3A LDO 5-Pin 2.5V Fixed Linear Regulatorfor Remote Sense Applications |
| CS5253B-8_05 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:3.0 A LDO 5−Pin 2.5 V Fixed Linear Regulator for Remote Sense Applications |
| CS5253B-8GDP5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:ON Semiconductor 功能描述:3.0 A LDO 5-Pin 2.5 V Fixed Linear Regulator for Remote Sense Applications |
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