TC1301A datasheet(16/28 Pages) MICROCHIP

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TC1301A/B

DS21798C-page 16

5.14

TC1301B RESET Timing

The timing waveforms for the TC1301B RESET output

are shown in Figure 5-4. Note that the RESET

threshold input for the TC1301B is VOUT1. The VOUT1

to RESET threshold detector connection is made

internal in the case of the TC1301B.

FIGURE 5-4:

TC1301B RESET Timing.

5.15

Device Protection

5.15.1

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 TC1301A/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.The VDET

and RESET circuit will continue to operate in the event

of an overcurrent on either output for the TC1301A.

The voltage detect and RESET circuit will continue to

operate in the event of an overcurrent on VOUT1 (or

VOUT2) for the TC1301B. In the event of an overcurrent

on VOUT1, the RESET will detect the absence of VOUT1.

5.15.2

OVERTEMPERATURE

PROTECTION

If the internal power dissipation within the TC1301A/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. The device will resume normal

operation. If the internal power dissipation continues to

be excessive, the device will again shut off. The VDET

and RESET circuit will continue to operate normally

during an overtemperature fault condition for both the

TC1301A and TC1301B.

RESET Time

TRPD

VTH

VOUT1

RESET

VOL

VOH

VIN

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