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PDF TS1582 Data sheet ( Hoja de datos )
| Número de pieza | TS1582 | |
| Descripción | 3A Dual Input Low Dropout Positive Voltage Regulator | |
| Fabricantes | Taiwan Semiconductor | |
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TS1582
3A Dual Input Low Dropout Positive Voltage Regulator
Pin Assignment:
1. Sense
2. Adj / Gnd
3. Output
4. V control
5. V power
Low Dropout Voltage 0.7V max.
Fix or Adjustable Output
General Description
The TS1582 family is a positive adjustable and fixed voltage regulator developed to provide 3A with Higher efficiency than
currently available devices. All internal circuit is designed to operate down to 700mV input to output differential and the
dropout voltage is fully specified as a function of load current. Dropout voltage of the device is 100mV at light loads and
rising to 700mV at maximum output current. A Second low current input is required to achieve this dropout. The TS1582
series are designed to prevent device failure under the worst operation condition with both Thermal Shutdown and
Current Fold-back.
Features
Ordering Information
Very low dropout voltage: 700mV @3A
Output current up to 3A
Low current Consumption
High Accuracy Output Voltage: +/- 1%
Fast transient response
Remote sense
Internal current limit
Thermal shutdown protection
Applications
www.DataSheHeti4gUh.ceofmficiency linear voltage regulators
Post regulators for switching supplies.
Advance graphic card
Adjustable power supply
Block Diagram
Part No.
Operating Temp. Package
(Ambient)
TS1582CZ5xx
TO-220-5L
TS1582CZ5
0 ~ +85 oC
TS1582CM5xx
TO-263-5L
TS1582CM5
Note: Where xx denotes voltage option, available are
3.3V and 2.5V. Leave blank for adjustable version.
Contact factory for additional voltage options.
Typical Application Circuit
TS1582 series
1-1 2003/12 rev. A
1 page  
Application Information (continued)
The effect on output regulation can be seen in trace B
of Figure 3. It is important to note that the voltage drops
due to Rp are not eliminated; they will add to the
dropout voltage of the regulator regardless. The
TS1582 can control the voltage at the load as long as
the input-output voltage is greater than the total of the
dropout voltage of the device plus the voltage drop
across Rp
Figure 3. Remote Sensing Improves Load Regulation
Because they contain parasitic resistance and
inductance, capacitors are not ideal elements. These
parasitic elements dominate the change in output
voltage as the beginning of a transient load step
change. The ESR of the output capacitors produces
and instantaneous step in output voltage
∆V = ∆I (ESR). The ESL of the output capacitors
produces a drop proportional to the rate of change of
the output current V = L (∆I / ∆t). the output
capacitance produces a change in output voltage
proportional to the time until the regulator can respond
∆V = ∆t (∆I / C).
Figure 4. illustrates there transient effects.
Stability
The circuit design used in the TS1582 Series requires
the use of an output capacitor as part of the device
frequency compensation. The addition of 150uF
aluminum electrolytic or a 22uF solid tantalum on the
output will ensure stability for all operating conditions.
www.DataSInheeotr4dUe.cromto meet the transient performance of the
processor larger value capacitors are needed. To limit
the high frequency noise generated by the processor
high quality bypass capacitors must be used. In order
to limit parasitic inductance (ESL) and resistance
(ESR) in capacitors to acceptable limits, multiple small
ceramic capacitors in addition to high quality solid
tantalum capacitors are required.
When the adjustment terminal is bypass to improve the
ripple rejection, the requirement for an output capacitor
increases. The Adjust pin is brought out on the fixed
voltage device specifically to allow this capability. To
further improve stability and transient response of
these devices larger values of output capacitor can be
used. The modern processors generate large high
frequency current transients. The load current step
contains higher order frequency components than the
output coupling network must handle until the regulator
throttles to the load current level.
Output voltage
The TS1582 (adjustable version) develops a 1.25V
reference voltage between the Sense Pin and the
Adjust Pin (Figure 5). Placing a resistor between these
two terminals causes a constant current to flow though
R1 and down though R2 to set the output voltage. In
general R1 is chosen so that this current is the
specified minimum load current of 10mA. The current
out of the Adjust pin is small, typically 50uA and it adds
to the current from R1.For best regulation the top of the
resistor divider should be connected directly to the
Sense pin.
Figure 5. Setting Output Voltage
TS1582 series
5-5 2003/12 rev. A
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet TS1582.PDF ] | |
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