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参数资料
| 型号： | NCP102SNT1G |
| 厂商： | ON Semiconductor |
| 文件页数： | 8/9页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 6-TSOP |
| 标准包装： | 3,000 |
| 类型： | 正，可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 0.8V |
| 电流 - 电源： | 1.8mA |
| 输入电压： | 4.5 V ~ 13.5 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | SC-74，SOT-457 |
| 供应商设备封装： | 6-TSOP |
| 包装： | 带卷 (TR) |
| 其它名称： | NCP102SNT1G-ND NCP102SNT1GOSTR |
NCP102
SOFT-START
Soft-start reduces inrush current and overshoot of the
output voltage. The adjustable soft-start built into the
NCP102 allows the user to select the optimum soft-start
time for the application. The soft-start time is set with a
capacitor from the SOFT-S pin to ground.
Soft-start is achieved by controlling the slope of the DRV
voltage based on the slope of the soft-start capacitor voltage,
C SOFT-S . The capacitor is charged to V CC with a constant
4.5 m A (typ.) current source, I SOFT-S . This results in a linear
charge of the soft-start capacitor and thus the output voltage.
The soft-start period, t SOFT-S , ends once the capacitor
voltage reaches 0.8 V (typ). The soft-start capacitor is
calculated using Equation 3.
V out (slave)
Soft-Start (slave )
V out (master)
Soft-Start (master)
t SOFT * S +
c SOFT * S @ 0.8
I SOFT * S
(eq. 3)
Figure 13. Power-up Sequencing Waveforms
Power sequencing will affect the soft-start time
The soft-start capacitor is internally pulled to GND when
V CC is not within its operating range or the controller is
disabled using the EN pin.
POWER SEQUENCING
Power sequencing can be easily implemented using the
SOFT-S and EN pins. This is achieved by directly
connecting the SOFT-S pin of the master controller to the
EN pin of the slave controller. If V CC is above 9.5 V a
resistor divider is required to limit the voltage on the EN pin
because the pin is internally clamped to 9.5 V. Figure 13
shows the timing waveforms of the master and slave
controllers.
calculated using Equation 3 because the soft-start capacitor
charge current is now increased by the enable charge current.
The soft-start time is calculated using Equation 3 by
replacing I SOFT-S with the sum of I EN and I SOFT-S .
APPLICATION INFORMATION
ON Semiconductor provides an electronic design tool, a
demonstration board and an application note to facilitate
design using the NCP102 and to reduce development cycle
time. All the tools can be downloaded at www.onsemi.com.
The electronic design tool allows the user to easily
determine most of the system parameters of a linear
regulator. The tool also evaluates the frequency response of
the system. The demonstration board is designed to generate
a 1.2 V/3 A voltage supply from a 1.8 V supply. The circuit
schematic is shown in Figure 14 and the regulator design is
described in Application Note AND8303.
V CC
J1
V in
J2
TP2a
TP2
TP1
U1
TP5
TP12
Open
C10
C5
C6
R8
ENABLE 1 k
J5
C11
100 p
MMBT3904
Q3
R6
10 k
R7
365 k
1
2
3
EN
GND
FB
V CC
DRV
SOFT-S
6
5
4
0.01
C3
R1
200
C4
100 p
NTD40N03
Q1
R2
Q2
TP6a
100
470
C7
1000
4.7
C8
4.7
0.1
C9
0.1
V out
J3
TP6
NCP102 TP4
C1
0.01
R5
0
R3
TP7
10 k
TP8
TP9
TP3
TP10
TP11
R4
20 k
J4
GND
J6
Figure 14. Circuit Schematic
http://onsemi.com
8
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