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TS1581CZ5XXC0 Scheda tecnica(PDF) 3 Page - Taiwan Semiconductor Company, Ltd

Il numero della parte TS1581CZ5XXC0
Spiegazioni elettronici  5A Dual Input LDO
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Produttore elettronici  TSC [Taiwan Semiconductor Company, Ltd]
Homepage  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS1581CZ5XXC0 Scheda tecnica(HTML) 3 Page - Taiwan Semiconductor Company, Ltd

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TS1581
5A Dual Input LDO
3/9
Version: A07
Thermal Performance
Condition
Package type
Typ
Unit
TO-220-5L
50
Thermal Resistance
Junction to Ambient
TO-263-5L
60
oC/W
Pin Description
Pin No.
Pin Name
Pin Description
1
Sense
This pin is the positive side of the reference voltage for this device. With this pin it is
possible to Kelvin Sense the output voltage at the load.
2
Adjust /
Ground
This pin is the negative side of the reference voltage for this device. Transient response
can be improved by adding a small bypass capacitor from the adjust pin to ground.
3
Output
This pin is power output of the device.
4
Control
This pin is the supply pin for the control circuitry for the device. The current flow into this
pin will be about 1% of the output current. For the device to regulate, the voltage at this
pin must be 1.3V greater than the output voltage.
5
Power
This pin is the collector of the power transistor. The output load current is supplied
through this pin. The voltage at this pin must be 0.7V greater than the output voltage for
the device to regulate.
Application Information
Application
The TS1581 is a low dropout regulator designed to make used of multiple power supplies, present in most systems, to
reduce the dropout voltage. One of the advantages of the two supply approach is maximizing the efficiency. The
second supply is at least 1V greater than output voltage and is providing the power for the control circuitry and supplies
the drive current to the NPN output transistor. This allows the NPN output transistor to be driven into saturation. For the
control voltage the current requirement is small equal to about 1% of the output current or approximately 50mA for a
5A load. This drive current becomes part of the output current. The maximum voltage on the Control Pin is 15V. The
maximum voltage at the Power in is 7V.By tying the control and power inputs together the TS1581 can also be
operated as a single supply device. In single supply operation the dropout will be determined by the minimum control
voltage. Both the fixed and adjustable versions have remote sense pins, permitting very accurate regulation of output
voltage. As a result, over and output current range of 100mA to 5A, the typical load regulation is less than 1mV. For the
fixed voltages the adjust pin is brought out allowing the user to improve transient response by bypassing the internal
resistor divider. Optimum transient response is provided using a capacitor in the range of 0.1uF to 1uF for bypassing
the adjust pin.
The new generation of microprocessors cycle load current from several hundred million amperes to several amperes in
tens of nanoseconds. Output voltage tolerances are tighter and include transient response as part of the specification.
Designed to meet the fast current load step requirements of these microprocessors, the TS1581 also saves total cost
by needing less output capacitance to maintain regulation.
Typical applications for the TS1581 include 3.3V to 2.5V conversion with a 5V control supply, 5V to 4.2V conversion
with a 12V control supply or 5V to 3.6V conversion with a 12V control supply. It is easy to obtain dropout voltages less
than 0.5V at 1.5A along with excellent static and dynamic specifications. It is fully protected against over current and
over temperature conditions.


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