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参数资料
| 型号： | PS10NG |
| 厂商： | SUPERTEX INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| 封装： | SOIC-14 |
| 文件页数： | 10/14页 |
| 文件大小： | 210K |
| 代理商： | PS10NG |
PS10/PS11
5
A051204
UV
OFF = VUVL = 1.12 = (VEEUV(off)) x (R2+R3)/(R1+R2+R3)
OV
OFF = VOVL = 1.22 = (VEEOV(off)) x R3/(R1+R2+R3)
Where (V
EEUV(off)) and (VEEOV(off)) relative to VEE are Under 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
OFF = 1.22 = (65xR3)/500k
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
OFF = 1.12 = 35 x (R2+R3)/ 500k
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.
From the calculated resistor values the OV and UV start
up threshold voltages can be calculated as follows:
UV
ON = VUVH = 1.22 = (VEEUV(on)) x (R2+R3)/(R1+R2+R3)
OV
ON = VOVL = 1.12 = (VEEOV(on)) x R3/(R1+R2+R3)
Where (V
EEUV(on)) and (VEEOV(on)) are Under and Over Voltage
Start Up Threshold points relative to V
EE.
Then
(V
EEUV(on)) = 1.22 x (R1+R2+R3)/(R2+R3)
(V
EEUV(on)) = 1.22 x (487k+6.65k+9.31k)/(6.65k+9.31k )
= 38.45V
And
(V
EEOV(on)) = 1.12 x (R1+R2+R3)/R3
(V
EEOV(on) ) = 1.12 x (487k +6.65k +9.31k)/9.31k = 60.51V
Therefore, the circuit will start when the input supply volt-
age is in the range of 38.45V to 60.51V.
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