NCP5222 ON Semiconductor, NCP5222 Datasheet - Page 12

• Manufacturer Part Number: NCP5222
• Description: High Performance Dual-channel / Two-phase Synchronous Buck Controller For Notebook Power System
• Manufacturer: ON Semiconductor

a negative−temperature−coefficient (NTC) thermistor may
be connected with C
Output Regulation
an accurate internal reference voltage, the NCP5222
regulates average DC value of the output voltage to a design
target by error integration function. The output has good
accuracy over full−range operation conditions and external
component variations.
Output Regulation in Two−Phase Mode
output regulation in the two−phase mode. Under the
two−phase configuration, a MOSFET SSH called sharing
switch is employed to connect two power rails V
Figure 7. Current Sensing Network and Overcurrent
As shown in Figure 8, with a high gain error amplifier and
Figure 10 shows a block diagram for explanation of the
L
DCR
Rcs1
Ccs
Rcs2
CS+
CS
CS−
in parallel.
Protection
R4
Figure 9. PWM Output Regulation in Dual−Channel Mode
1
R1
FB
0.8V
30mV
O1
COMP
and V
OC
http://onsemi.com
O2
PWM1
.
12
Output Regulation in Dual−Channel Mode
regulate their output voltage individually. As shown in
Figure 9, the output voltage is programmed by external
feedback resistors.
where Vref is an internal 0.8 V reference voltage.
where R
SWN
Vref
In dual−channel operation mode, the two channels
FB
ON_S
Figure 8. PWM Output Regulation
L
Amplifier
is on resistance of S
Error
V
I
o
Share
+ 1 )
Vo
Ramp
+
C
V
O2
R
R
R
1
4
Comparator
ON_S
* V
SH
PWM
@ V
.
O1
CLK
ref
S
R
Q
_
Q
(eq. 4)
(eq. 5)
PWM