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TS29152CM5 Fiches technique(PDF) 6 Page - Taiwan Semiconductor Company, Ltd

No de pièce TS29152CM5
Description  1.5A Ultra Low Dropout Voltage Regulator with Multi-Function
Download  11 Pages
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Fabricant  TSC [Taiwan Semiconductor Company, Ltd]
Site Internet  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS29152CM5 Fiches technique(HTML) 6 Page - Taiwan Semiconductor Company, Ltd

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TS29150/1/2/3
1.5A Ultra Low Dropout Voltage Regulator
with Multi-Function
6/11
Version: A07
Thermal Characteristics (Continue)
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. Using the calculated
values for TR(max) and PD, the maximum allowable value for the junction to ambient thermal resistance, θJA, can now
be found: θJA = TR(max) / PD
Adjustable Regulator Design
The adjustable regulator versions (TS29152/53) is allow to programming the output voltage anywhere between 1.25
and the 26V maximum operating rating of the family. Two resistors are used. Resistors can be quite large up to 1MΩ,
because of the very high input impedance and low bias current of the sense comparator, the resistor values are
calculated by:
R1 = R2 * [(VOUT / 1.24) – 1]
Where is Vout the desired output voltage. Above application circuit shows component definition. Applications with
widely varying load currents may scale the resistors to draw the minimum load current required for proper operation.
Error Flag
TS29151 and TS29153 versions feature an Error Flag, which looks at the output voltage and signals an error
condition when this voltage drops 5% below its expected value. The error flag is an open-collector output that pulls
low under fault conditions. It may sink 10mA. Low output voltage signifies a number of possible problems, including
an over-current fault (the device is in current limit) and low input voltage. The flag output is inoperative during over
temperature shutdown conditions.
Enable Input
TS29151 and TS29152 versions feature an enable (EN) input that allows ON/OFF control of the device. Special
design allows “zero” current drain when the device is disabled–only microamperes of leakage current flow. The EN
input has TTL/CMOS compatible thresholds for simple interfacing with logic, or may be directly tied to ≤30V.
Enabling the regulator requires approximately 20uA of current.


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