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TS29150 Fiches technique(PDF) 3 Page - List of Unclassifed Manufacturers

No de pièce TS29150
Description  1.5A Ultra Low Dropout Fixed Positive Voltage Regulator
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TS29150
3-5
2003/12 rev. A
Application Information
The TS29150 series are high performance with low
dropout voltage regulator suitable for moderate to high
current and voltage regulator application. Its 350mA(typ)
dropout voltage at full load and over temperature makes
it especially valuable in battery power systems and as
high efficiency noise filters in post regulator applications.
Unlike normal NPN transistor design, where the base to
emitter voltage drop and collector to emitter saturation
voltage limit the minimum dropout voltage, dropout
performance of the PNP output of these devices is limited
only by low Vce saturation voltage.
The TS29150 series is fully protected from damage due
to fault conditions. Linear current limiting is provided.
Output current during overload conditions is constant.
Thermal shutdown the device when the die temperature
exceeds the maximum safe operating temperature.
Transient protection allows device survival even when the
input voltage spikes above and below nominal. The
output structure of these regulators allows voltages in
excess of the desired output voltage to be applied without
reverse current flow.
Typical Application Circuit
Capacitor Requirement
The TS29150 series requires an output capacitor to
maintain stability and improve transient response is
necessary. The value of this capacitor is dependent upon
the output current, lower currents allow smaller
capacitors. TS29150 series regulators are stable with the
10uF minimum capacitor value at full load. Where the
regulator is powered from a source with high AC
impedance, a 0.1uF capacitor connected between input
and ground is recommended. The capacitor should have
good characteristics to above 250KHz. The capacitance
values will be improved transient response, ripple
rejection and output noise.
Minimum Load Current
The TS29150 series is specified between finite loads. If
the output current is too small leakage currents
dominate and the output voltage rises. A 10mA
minimum load current swamps any expected leakage
current across the operating temperature range.
Thermal Characteristics
TS29150 series linear regulators are simple to use, the
most complicated design parameters to consider are
thermal characteristics, thermal design requires the
following application specification parameters:
Maximum ambient temperature, Ta
Output current, Iout
Output voltage, Vout
Input voltage, Vin
We calculate the power dissipation of the regulator
from these numbers and the device parameters from
this data sheet. A heatsink may be required depending
on the maximum power dissipation and maximum
ambient temperature of the application. Under all
possible operating conditions, the junction temperature
must be within the range specified under absolute
maximum ratings. To determine if the heatsink is
required, the power dissipated by the regulator, PD
must be calculated.
The below formula shows the voltages and currents for
calculating the PD in the regulator:
Iin = IL / IG
PD = (Vin-Vout) * IL + (Vin) * IG
Ex. PD = (3.3V-2.5V) * 1.5A + 3.3V * 11mA
= 1200mW + 36mW
= 1236mW
Remark: IL is output load current,
IG is ground current.
Vin is input voltage
Vout is output voltage
The next parameter which must be calculated is the
maximum allowable temperature rise, TR(max). this is
calculated by the using to formula:
TR(max) = TJ(max) – TA(max)
Where: TJ(max) is the maximum allowable junction
temperature, which is 125
oC for commercial
grade parts.
TA(max) is the maximum ambient temperature
which will be encountered in the application.


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