TLVM13630 datasheet(19/44 Pages) TI

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7.3.6 Output ON/OFF Enable (EN) and VIN UVLO

The EN pin provides precision ON and OFF control for the TLVM13630. Once the EN/SYNC pin voltage exceeds

the threshold voltage and VIN is above the minimum turn-on threshold, the device starts operation. The simplest

way to enable the TLVM13630 is to connect EN directly to VIN. This allows the TLVM13630 to start up when

VIN is within its valid operating range. However, many applications benefit from the employment of an enable

divider network as shown in Figure 7-3, which establishes a precision input undervoltage lockout (UVLO). This

can be used for sequencing, to prevent re-triggering the device when used with long input cables, or to reduce

the occurrence of deep discharge of a battery power source. An external logic signal can also be used to drive

the enable input to toggle the output on and off and for system sequencing or protection.

VIN

AGND

RENB

RENT

Figure 7-3. VIN UVLO Using the EN Pin

RENB can be calculated using Equation 6.

(6)

where

• A typical value for RENT is 100 kΩ.

• VEN is 1.263 V (typical).

• VIN(ON) is the desired start-up input voltage.

7.3.7 Power Good Monitor (PG)

The TLVM13630 provides a PGOOD signal to indicate when the output voltage is within regulation. Use the

PGOOD signal for output monitoring, fault protection, or start-up sequencing of downstream converters. The

PGOOD pin voltage goes low when the feedback voltage is outside of the PGOOD thresholds. This occurs

during the following:

• While the device is disabled

• In current limit

• In thermal shutdown

• During normal start-up, when the output voltage has not reach its regulation value

A glitch filter prevents false flag operation for short excursions (<120 µs typical) of the output voltage, such as

during line and load transients.

PGOOD is an open-drain output that requires a pullup resistor to a DC supply not greater than 20 V. The typical

range of pullup resistance is 10 kΩ to 100 kΩ. When EN is pulled low, the flag output is also forced low. With EN

low, power good remains valid as long as the input voltage is above 1 V (typical). Use the PG signal for start-up

sequencing of downstream regulators, as shown in Figure 7-4, or for fault protection and output monitoring.

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TLVM13630

SLVSFT6B – MAY 2021 – REVISED JANUARY 2022

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TLVM13630 Datasheet(PDF) 19 Page - Texas Instruments