参数资料
| 型号： | NCP5222MNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/28页 |
| 文件大小： | 0K |
| 描述： | IC CTLR BUCK 2CH 2PH 28QFN |
| 标准包装： | 4,000 |
| 应用： | 多相控制器 |
| 电流 - 电源： | 2.5mA |
| 电源电压： | 4.5 V ~ 27 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-VFQFN 裸露焊盘 |
| 供应商设备封装： | 28-QFN（4x4） |
| 包装： | 带卷 (TR) |
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NCP5222
a negative ? temperature ? coefficient (NTC) thermistor may
be connected with C CS in parallel.
FB
CLK
S
Q
PWM
Ramp
R
_
Q
L
Rcs1
CS+
Vref
Error
Amplifier
PWM
Comparator
DCR
Ccs
Rcs2
CS ?
1
OC
Figure 8. PWM Output Regulation
30mV
Figure 7. Current Sensing Network and Overcurrent
Protection
Output Regulation in Dual ? Channel Mode
In dual ? channel operation mode, the two channels
regulate their output voltage individually. As shown in
Figure 9, the output voltage is programmed by external
feedback resistors.
Output Regulation
As shown in Figure 8, with a high gain error amplifier and
V o + 1 )
R 1
R 4
@ V ref
(eq. 4)
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.
R1
where Vref is an internal 0.8 V reference voltage.
R4
FB
COMP
PWM1
SWN
L
Vo
0.8V
Figure 9. PWM Output Regulation in Dual ? Channel Mode
C
Output Regulation in Two ? Phase Mode
Figure 10 shows a block diagram for explanation of the
output regulation in the two ? phase mode. Under the
I Share +
V O2 * V O1
R ON_S
(eq. 5)
two ? phase configuration, a MOSFET SSH called sharing
switch is employed to connect two power rails V O1 and V O2 .
where R ON_S is on resistance of S SH .
http://onsemi.com
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