cs5323gdw20 ON Semiconductor, cs5323gdw20 Datasheet - Page 15

• Manufacturer Part Number: cs5323gdw20
• Description: Three-phase Buck Controller With 5-bit Dac
• Manufacturer: ON Semiconductor

adaptive positioning and current limit for a 12 V to 1.5 V 60
A converter. The adaptive positioning is chosen 20 mV
below the maximum V
no−load position with 60 A out. The peak output voltage
transient is 100 mV max during a 60 A step current. The
overcurrent limit is nominally 75 A.
Current Sensing, Power Stage
and Output Filter Components
1. Assume 1.5 mΩ of output filter ESR.
2.
Choose the component values for lossless current sensing,
4.00
3.50
3.00
2.50
2.00
1.50
1.00
0.50
0.00
R + (V IN * V OUT )
L R L + .01 mF
Choose R L + 2.0 mW
L + 2 mW
0
Figure 13. Normalized Input Filter Capacitor
+ (12 * 1.5)
+ 21 kW å Choose 20 kW
DESIGN EXAMPLE
200 ms + 400 nH
Ripple Current
1/ Apparent Duty Cycle
OUT
10
20 kW + 200 ms
(1.5 12) (250 k
at no load and 70 mV below the
(V OUT V IN) (F
5
.01 mF
C
http://onsemi.com
25 mV)
25 mV)
15
15
Current Limit
Adaptive Positioning
10.
11.
12.
3. n/a
4.
5. n/a
7.
8.
6.
9.
V I(LIM) + R L
R V(FB) + NL Position V FB Bias Current
DV DRP + R L
R V(DRP) + DV DRP
PwrstgZ + R L
ConverterZ +
DVR + 1.0 mW
Apparent Duty Cycle + 0.16
RMS ripple is 9.4 A
I IN + 1.6 V
Duty Cycle +
( 0.85
+ 1.5 mW
+ 20 mV 19 mA ^ 1.00 kW
+ 2 mW
+ 1.5 mW
+ 360 mV
+ 2.8 mW
PwrstgZ
PwrstgZ ) ESR
2.8 mW ) 1.5 mW
( 0.85
12V IN )
I OUT(LIM)
60 A
I OUT
CSA Gain 3
60 A + 60 mV
60 A
1.6 V
75 A
4.2 3 + 2.1 mW
1.0 + 9.4 A
+ 9.4 A
12 V IN )
R V(FB) DV OUT
1.00 kW 50 mV + 7.2 kW
1.5 mW
Current Sense to V DRP Gain
ESR
3 + 360 mV
6.5 + 731 mV
CS to I LIM Gain
+ 0.16
3.0 + 0.48
^ 1.0 mW