TLS115D0

High Precision Voltage Tracker

Block description and electrical characteristics

Data Sheet

10

Rev. 1.00

2016-10-13

4

Block description and electrical characteristics

4.1

Tracking regulator

driving a PNP pass transistor accordingly. The stability of the control loop depends on:

•load current

• chip temperature

• the poles and zeroes in the frequency response of the circuit consisting of TLS115D0 and the load

To ensure stable operation, the output capacitor’s capacitance and its equivalent series resistance ESR

requirements given in the table “Functional range” on Page 8 must be maintained. For details see also the

typical performance graph “Output capacitor ESR(COUT) vs. output current IOUT” on Page 14. The output

capacitor must be sized suitably to buffer load transients.

Connect each capacitor close to the pins.

Protection circuitry prevents the TLS115D0 itself as well as the application from destruction in case of

catastrophic events. These safeguards contain:

• output current limitation

• reverse polarity protection

• thermal shutdown

In order to protect the pass element and the package from excessive power dissipation the TLS115D0 reduces

the maximum output current at high input voltage.

The TLS115D0 allows a negative supply voltage. However, in reverse polarity condition several low currents

flowing into the TLS115D0 increase junction temperature. Thermal design must consider this effect, because

in reverse polarity condition the overtemperature protection circuit does not operate.

The overtemperature protection circuit prevents immediate destruction of the TLS115D0 in certain fault

conditions (for example a permanent short circuit at output) by switching off the power stage. After the chip

cools down, the regulator restarts. If the fault is not removed, then this leads to an oscillatory behavior of the

output voltage. Please note, that a junction temperature above 150°C is outside the maximum ratings and

reduces the lifetime of the TLS115D0.

Table 5

Electrical characteristics tracking regulator

current flowing into pin (unless otherwise specified).

Parameter

Symbol

Values

Unit Note or

Test Condition

Number

Min.

Typ.

Max.

Tracking output

Output voltage tracking

accuracy

-5

–

5

mV

150 mA;

P_4.1.1