Operation

VIPER38

20/31

DocID025703 Rev 2

7.9

About CONT pin

Referring to Figure 22: CONT pin configuration, the CONT pin is used to configure the:

1.

2.

output overvoltage protection (OVP)

Table 9: CONT pin configurations lists the external components needed to activate one or

more of the CONT pin functions.

Figure 22. CONT pin configuration

7.10

Feedback and overload protection (OLP)

The device is a current-mode converter. The feedback pin controls PWM operation as well

as burst mode and activates the overload protection. Figure 23: FB pin configuration (option

1) and Figure 24: FB pin configuration (option 2) show the internal current-mode structure.

the drain current is sensed and converted to voltage that is applied to the non-inverting pin

of the PWM comparator.

This voltage is compared to the voltage on the feedback pin through a voltage divider on a

cycle-by-cycle basis. When these two voltages are equal, the PWM logic orders the switch-

Table 9. CONT pin configurations

Function / component

See Figure 13: IDlim vs. RLIM

No

No

OVP

≥ 80 kΩ

See Equation 4

Yes

(1)

1.

See Figure 13: IDlim vs. RLIM

See Equation 4

Yes