参数资料
型号: NCP3122MNTXG
厂商: ON Semiconductor
文件页数: 22/42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
Sequential Sequencing (First ? Up/Last ? Down
Sequence Configuration)
In sequential sequencing mode, the second output voltage
starts ramping when the first output voltage is already settled
and its power good signal is set. Figure 46 shows the
NCP3122’s configuration and standard waveforms. The
rising slope of both voltages can be selected independently
by the soft ? start capacitors’ values (C12, C22). When the
enable pin is deactivated, the second output voltage
decreases first, followed by the first output voltage. The
control logic is based on the internal power good signal; no
delay is added. The signal has the same threshold values as
the power good signal shown in the electrical table. The
sequential sequencing mode is also called first ? up/
last ? down and is ideal for DSPs with separate power
supplies for the core and the I/O ports.
Note: If enable control is not required, float the
EN(first)/SEQ(last) connection rather than pulling it to VIN
or a separate supply voltage. For Figure 46 this is
EN1/SEQ1. For Figure 47, this is EN1/SEQ4. 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
SW1
VIN
VIN
L11
D11
R11
C11
SEQ1
EN2
SEQ2
TRACK1
TRACK2
NCP3122
VIN
VIN
VIN
VIN
SW2
C1
GND
GND
L21
C2
GND
R12
GND
GND
OUT2
D21
R21
C21
R_T
C22
GND
GND
R22
GND
C12 C22
GND
C22 C12
R23
C23
GND
GND
VOUT1
VOUT2
Figure 46. Sequential Configuration
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