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NCP1583 Datasheet(PDF) 11 Page - ON Semiconductor

Part # NCP1583
Description  Low Voltage Synchronous Buck Controllers
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1583 Datasheet(HTML) 11 Page - ON Semiconductor

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NCP1582, NCP1582A, NCP1583
http://onsemi.com
11
Design Example
Switching Frequency FSW = 350 KHZ
Output Capacitance CESR = 45 mW/Each
Output Capacitance Cout = 6630 mF
Output Inductance Lout = 0.75 mH
Input Voltage Vin = 12 V
Output Voltage Vout = 3.3 V
Choose the loop gain crossover frequency;
FCO +
1
10
*FSW + 35 kHz
The corner frequency of the output filter is calculated
below;
FLC +
1
2*
p *0.75 mH * 6630 mF
+ 2.3 kHz
Let RC = 1500
Check that the ESR zero frequency is not too high;
FESR +
1
2*
p @ CESR @ CO
t
FSW
5
This condition is mandatory for loop stability.
Zero of the compensation network is calculated as
follows;
FZ + FLC
CC +
1
2*
p *FZ *RC
+
1
2*
p * 2.3 kHz * 1500
+ 46 nF
The compensation capacitor also acts as the soft start
capacitor. By adjusting the value of this compensation
capacitor, the soft start time can be adjusted.
Pole of the compensation network is calculated as
follows;
FP + 5* FCO + 175 kHz
CP +
1
2*
p *FP *RC
+
1
2*
p * 175 kHz * 1500
+ 700 pF
The recommended compensation values are;
RC = 1500, CC = 46 nF, CP = 700 pF
The NCP158x bode plot as measured from the network
analyzer is shown below.
Figure 15. Typical Bode plot of the Open−loop
Frequency Response of the NCP158x
Top plot: Phase−Frequency (Phase Margin = 62.519
°)
Bottom plot: Gain−Frequency (UGBW= 5 MHz)


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