DocID17811 Rev 4

9/19

SRK2000

Application information

19

6

Application information

6.1

EN pin - pin function and usage

to-source voltage of either synchronous rectifier (SR) Power MOSFET to determine their

turn-off in each conduction cycle; it allows the user to program the UVLO thresholds of the

gate drivers and can be used as Enable (remote on/off control).

6.1.1

Pull-up resistor configuration

(= 0.36 V) the threshold is set at -25 mV, otherwise at -12 mV. Once the decision is made,

voltage on the EN pin as the device turns on is given by:

Equation 1

Then, considering worst-case scenarios, we have:

Equation 2

Some additional margin (equal to the resistor's tolerance) needs to be considered;

Figure 5. EN pin biased with a pull-up resistor (for logic level MOSFET driving)

1

R

I

V

V

EN

CCOn

EN





mV

25

V

k

633

1

R

Off

_

2

,

1

DVS











mV

12

V

k

296

1

R

Off

_

2

,

1

DVS









