参数资料
型号: NCP3122MNTXG
厂商: ON Semiconductor
文件页数: 20/42页
文件大小: 0K
描述: IC REG BUCK ADJ 2A DL 32QFN
产品变化通告: NCP312x Soft Start Charge 6/Nov/2008
标准包装: 4,000
类型: 降压(降压)
输出类型: 可调式
输出数: 2
输出电压: 可调至 0.8V
输入电压: 4.5 V ~ 15 V
频率 - 开关: 200kHz ~ 2.2MHz
电流 - 输出: 2A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 32-VFQFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 32-QFN(5x5)
NCP3122
Ratiometric Sequencing
In the ratiometric sequencing mode, multiple outputs start
ramping at the same time and also reach the regulation level
at the same time. When common EN is pulled down, the
output voltages are going down at the same time. See Figure
40. This functionality is created by using the same capacitor
values as the soft ? start capacitors for all outputs and by
connecting all EN + SEQ pins together. To ensure this
behavior, the soft start capacitors should have values greater
than the time constant of the output inductor and output
capacitor.
For proper operation in this mode, using a common
soft ? start capacitor for both channels is not recommended.
Note: If enable control is not required, float the EN/SEQ
connections rather than pulling them to VIN or a separate
supply voltage. The NCP3122 will enable itself once VIN
crosses the input UVLO threshold.
R_TRACK
AVIN
C3
C13
R13
C12
GND
VIN
OUT1
Disable
Enable
EN1
PG1
PG2
EN1
SEQ1
EN2
SEQ2
TRACK1
TRACK2
NCP3122
SW1
VIN
VIN
VIN
VIN
VIN
VIN
SW2
L11
D11
GND
C1
GND
L21
C2
GND
R11
R12
GND
C11
GND
OUT2
D21
GND
R21
C21
VOUT1
VOUT2
R_T
GND
C22
R23
C23
GND
GND
R22
GND
GND
Figure 40. Ratiometric Sequencing Configuration
http://onsemi.com
20
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