参数资料
| 型号： | NCP5222MNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 11/28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
VIN
VCC
EN1
EN2
3.5us
3 .6V
4.2 5V
DRVS
53us
0 .5V
0.2V
150us
PGOOD1
150us
PGOOD2
Vo1
57us
1ms
260us
Vo2
67us
1ms
260 us
Mode detection
complete.
Ch2 r amping up
complet e.
PGOOD2
vali d.
Ch1 sof tst art
begins.
Ch1 i n
regul ation.
DRVS soft start
complet e.
System and Ch2 reset complete Ch2 i n EN1 goes hi gh
regul ati on. and Ch1 reset.
EN2 goes high and
mode detection starts. and Ch2 soft start begins.
Ch1 rampi ng up
complet e.
PGOOD1 valid and
DRVS soft start begins.
Ch1 power down.
Ch2 power down.
Figure 6. Timing Diagram in Two ? Phase Mode
Control Logic
The NCP5222 monitors V CC with undervoltage lockout
(UVLO) function. If V CC is in normal operation range, the
converter has a soft ? start after EN signal goes high. The
internal digital soft ? start time is fixed to 1 ms. The two
differential amplifier in each channel allows low ? resistance
current ? sense resistor or low ? DCR inductor to be used to
minimize power dissipation. For lossless inductor current
sensing as shown in Figure 7, the sensing RC network
should satisfy:
channels share one DAC ramping ? up circuit. If the two ENs
become high at the same time (within 5 m s), the two channels
start soft ? start together; If one channel’s EN comes when the
L
DCR
+
R CS1 @ R CS2
R CS1 ) R CS2
@ C CS + k CS @ R CS1 @ C CS (eq. 1)
k CS +
other channel is powering up, the channel starts powering up
after the other channel completes soft start. If one channel’s
EN comes when the other channel is in any fault condition,
the channel does not start powering up until the fault is
where the dividing ? down ratio k CS is
R CS2
R CS1 ) R CS2
(eq. 2)
cleared. The NCP5222 has output discharge operation
through one internal 20 W MOSFET per channel connected
from CS ? /Vo pin to PGND pin, when EN is low or the
channel is under any fault condition.
Current ? Sense Network
In the NCP5222, the output current of each channel is
DCR is a DC resistance of an inductor, and normally CCS
is selected to be around 0.1 m F. The current ? sense input
voltage across CS+ and CS ? is
V CS + k CS @ I L @ DCR (eq. 3)
If there is a need to compensate measurement error caused
by temperature, an additional resistance network including
sensed differentially. A high gain and low offset ? voltage
http://onsemi.com
11
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