Help Needed on Maxim DG417/8/9 family.

[waka]

Hi 2 U all first of all!

Well, let me explain the problem i've got uzing DG418.

FACTS: I cannot controll the power sequence for this CMOS unit!

Solution: as shown on MAXIM databook for DG41_ family it's easy to solve if you have a bipolar alimentation (eg: V- = -15Vcc , V+ = +15Vcc) as a matter of fact you need to add 2 small signal diode between Main supply(positive) in direction V+ and between V- and Main supply (negative) in direction Main supply(negative).

The Problem: in my case i've got a single supply, so V- should be connected to GND. But now, does the direction of the small signal diode sould have to be connected equally or what else?

Attached 1 IMAGE with 2 FLATTEN images.

In the Image, A & B Directions are OK?

Thank's to U all again.

Waka.

 

[tx]

I think that it should work, the direction of diode is right.

Note that you are going to work near the minimum voltage at wich the IC works (10V), it becomes slower.

 

[waka]

well, i think my maximum switching will be 8Khz maybe 12Khz no more!

Then, i also read on another product that is pin compatible with DG41x family, but it's just in SO, that if you use unipolar power supply for V+ and V- you do not need to use the B diode.

Note that BAT42 has Vd of 0.3V when Id 10mA but when lower Id is used Vd is lower too. The DG41x use throught V+ and V- channel 0.0001uA......

Hi 2 U all.

Waka.