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NCP631GD2TR4 Datasheet(PDF) 6 Page - ON Semiconductor

Part # NCP631GD2TR4
Description  3.0 A Linear Voltage Regulator with Soft?뭆tart
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP631GD2TR4 Datasheet(HTML) 6 Page - ON Semiconductor

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NCP631
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6
APPLICATIONS INFORMATION
Input Capacitor
The minimum capacitance required for stability is a 68
mF
aluminum electrolytic or tantalum capacitor. The maximum
ESR allowed for stability is 5.0
W. The capacitor should be
place as close as possible to the input of the device.
The placement of a ceramic capacitor in parallel is not
recommend due to possible instabilities.
Output Capacitor
A minimum output capacitor value of 33
mF is required for
stability. The type of capacitor can be aluminum electrolytic
or tantalum capacitor. ESR can vary up to a maximum of
2.0
W for stability. The capacitor should be placed as close
as possible to the output of the device.
The placement of a ceramic capacitor in parallel is not
recommend due to possible instabilities.
Soft−Start Function
Slope of the output voltage during startup (Shutdown pin
goes from low to high) can be adjusted by value of Cs
capacitor. The basic formula for this function is:
dV
dt
+ Iss
Cs
+
Iout
Cout
*
Vref
Vout
(eq. 1)
Where:
Iss + 11 mA
(eq. 2)
Vref + 1.2 V
Vout + 3.47 V
Cs
+ 10 nF (typ)
Output current limitation during start−up:
Iout +
Vout
Vref
*Cout *
Iss
Cs
(eq. 3)
An example for Cout = 500
mF, Cs = 10 nF:
Iout +
3.47
1.2
* 500E
* 6* 11E * 6
10E
* 9 +
1.59 A (eq. 4)
Time when the output voltage will reach target value can be
determined by:
Ts
+ Vref * Cs
Iss
(eq. 5)
An example for Cs = 10 nF:
Ts
+ 1.2 * 10E * 9
11E
* 6 +
1.09 ms
(eq. 6)
Figure 13. Typical Soft−Start Condition
2
0
4
2
0
2
1
0
2
1
0
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
TIME (mS)
Vin = 5.5 V, Rout = 6.0 W, Cs = 10 nF
Cout = 385 mF + 33 mF + 22 mF
3


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