TC1302A datasheet(13/26 Pages) MICROCHIP

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DS21333B-page 13

TC1302A/B

5.9

TC1302A SHDN2 Timing

VOUT1 will rise independent of the level of SHDN2 for

the TC1302A. Figure 5-1 is used to define the wake-up

time from shutdown (tWK) and the settling time (tS). The

wake-up time is dependant upon the frequency of

operation. The faster the SHDN pin is pulsed, the

shorter the wake-up time will be.

FIGURE 5-1:

TC1302A Timing.

5.10

TC1302B SHDN1/SHDN2 Timing

For the TC1302B, the SHDN1 input pin is used to

control VOUT1. The SHDN2 input pin is used to control

VOUT2, independent of the logic input on SHDN1.

FIGURE 5-2:

TC1302B Timing.

5.11

Device Protection

5.11.1

OVERCURRENT LIMIT

In the event of a faulted output load, the maximum

current the LDO output will permit to flow is limited

internally for each of the TC1302A/B outputs. The peak

current limit for VOUT1 is typically 1.1A, while the peak

current limit for VOUT2 is typically 0.5A. During short-

circuit operation, the average current is limited to

200 mA for VOUT1 and 140 mA for VOUT2.

5.11.2

OVERTEMPERATURE

PROTECTION

If the internal power dissipation within the TC1302A/B

is excessive due to a faulted load or higher-than-

specified line voltage, an internal temperature-sensing

element will prevent the junction temperature from

exceeding

approximately

150°C.

the

junction

temperature does reach 150°C, both outputs will be

disabled until the junction temperature cools to

approximately 140°C and the device resumes normal

operation. If the internal power dissipation continues to

be excessive, the device will again shut off.

VIN

SHDN2

VOUT1

VOUT2

twk

SHDN2

SHDN1

VIN

VOUT1

twk

VOUT2

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