TS29102CS datasheet(6/8 Pages) TSC

6 / 8 page

TS29100/1/2

6-6

2003/12 rev. A

Application Information

The TS29100/1/2 series are high performance with low

dropout voltage regulator suitable for moderate to high

current

and

voltage

regulator

application.

Its

4000mA(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 TS29100/1/2 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.

Capacitor Requirement

The TS29100/1/2 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. TS29100/1/2 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 help to improved transient

response, ripple rejection and output noise.

Minimum Load Current

The TS29100/1/2 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.

Adjustable Regulator Design

The adjustable regulator versions (TS29102) 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

TS29101 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

TS29101 and TS29102 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.

TS29102CS Datasheet(PDF) 6 Page - Taiwan Semiconductor Company, Ltd

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