PS10 SUTEX [Supertex, Inc], PS10 Datasheet - Page 5

• Manufacturer Part Number: PS10
• Description: Quad Power Sequencing Controller
• Manufacturer: SUTEX [Supertex, Inc]

UV
OV
Where (V
and Over Voltage Shut Down Threshold points.
If we select a divider current of 100 A at a nominal oper-
ating input voltage of 50 Volts, then
R1+R2+R3 = 50V/100 A = 500k
From the second equation, for an OV shut down threshold
of 65V, the value of R3 may be calculated.
OV
R3 = (1.22x 500k)/65 = 9.38k
The closest 1% value is 9.31k .
From the first equation, for a UV shut down threshold of
35V, the value of R2 can be calculated.
UV
R2 = ((1.12 x 500k)/35) – 9.76k = 6.69k
6.65k is a standard 1% value
Then
R1 = 500k – R2 – R3 = 484.04k .
487k , is a standard 1% value.
OFF
OFF
OFF
OFF
= V
= 1.12 = 35 x (R2+R3)/ 500k
= V
= 1.22 = (65xR3)/500k
EEUV(off)
UVL
OVL
= 1.12 = (V
= 1.22 = (V
) and (V
EEUV(off)
EEOV(off)
EEOV(off)
) x (R2+R3)/(R1+R2+R3)
) relative to V
) x R3/(R1+R2+R3)
EE
are Under
5
From the calculated resistor values the OV and UV start
up threshold voltages can be calculated as follows:
UV
OV
Where (V
age Start Up Threshold points relative to V
Then
(V
(V
= 38.45V
And
(V
(V
Therefore, the circuit will start when the input supply volt-
age is in the range of 38.45V to 60.51V.
EEUV(on)
EEUV(on)
EEOV(on)
EEOV(on)
ON
ON
= V
= V
) = 1.22 x (R1+R2+R3)/(R2+R3)
) = 1.22 x (487k+6.65k+9.31k)/(6.65k+9.31k )
) = 1.12 x (R1+R2+R3)/R3
UVH
OVL
EEUV(on)
) = 1.12 x (487k +6.65k +9.31k)/9.31k = 60.51V
= 1.12 = (V
= 1.22 = (V
) and (V
EEOV(on)
EEUV(on)
EEOV(on)
) x R3/(R1+R2+R3)
) x (R2+R3)/(R1+R2+R3)
) are Under and Over Volt-
EE
.
A051204