LM5037MTSLASHNOPB datasheet(25/40 Pages) TI

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t2 =

CSS x 1V

1 2A

= 1M x CSS

t1 =

CRES x 2.0V

18 2A

= 111K x CRES

RES

OUTA

OUTB

t 2

Current Limit Detected

at CS

12A

Current Limit Persists

100 2A

2.0V

1.25V

STANDBY

0.45V

SHUTDOWN

VIN

5.0V

UVLO

22 2A

OFF

STANDBY

LM5037

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SNVS578D – NOVEMBER 2008 – REVISED MAY 2015

Application Information (continued)

Ensure that both the power and voltage ratings are (0603 resistors can be rated as low as 50 V) for the selected

R1 resistor. Maintain the UVLO threshold accuracy, by using a resistor tolerance of 1% or better.

Remote control of the LM5037 operational modes can be accomplished with open drain device(s) connected to

the UVLO pin as shown in Figure 25.

Figure 25. Remote Standby and Disable Control

8.1.5 Hiccup Mode Current Limit Restart (RES Pin)

The basic operation of the hiccup mode current limit is described in the functional description. The delay time to

the initiation of a hiccup cycle is programmed by the selection of the RES pin capacitor CRES as illustrated in

Figure 26.

Figure 26. Hiccup Over-Load Restart Timing

In the case of continuous cycle-by-cycle current limit detection at the CS pin, the time required for CRES to reach

the 2.0 V hiccup mode threshold is:

(10)

For example, if CRES = 0.01 µF the time t1 is approximately 2.0 ms. The cool down time, t2 is set by the soft-start

capacitor (CSS) and the internal 1 µA SS current source, and is equal to:

(11)

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