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参数资料
| 型号： | NCP1080DEG |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/15页 |
| 文件大小： | 221K |
| 描述： | IC CONV CTLR POE-PD 13W 20-TSSOP |
| 标准包装： | 74 |
| 类型： | 以太网供电开关（PoE） |
| 应用： | 远程外设（工业控制，相机，数据访问） |
| 内部开关： | 是 |
| 电流限制： | 500mA |
| 电源电压： | 0 V ~ 57 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 20-TSSOP-EP |
| 包装： | 管件 |
NCP1080
http://onsemi.com
12
(softstart capacitor) discharged. The DCDC controller
becomes operational as soon as RTNVPORTN
1,2
is below
the Vds_pgood threshold.
DCDC Converter Controller
The NCP1080 implements a current mode DCDC
converter controller which is illustrated in Figure 11.
VDDL
FB
CS
360 mV
Oscillator
COMP
SS
Gate
Driver
PWM comp
OSC
VDDL
VDDL
Blanking
time
Current Slope
Compensation
2
Softstart
R
S
Q
1.45 V
1.2 V
Current limit
comp
0
9 V LDO
3.3 V LDO
GATE
VDDH
ARTN
VPORTP
Set
CLK
Reset
CLK
Figure 11. DCDC Controller Block Diagram
5 kW
10 mA
11 kW
5 mA
Internal VDDH and VDDL Regulators and Gate Driver
An internal linear regulator steps down the VPORTP
voltage to a 9 V output on the VDDH pin. VDDH supplies
the internal gate driver circuit which drives the GATE pin
and the gate of the external power MOSFET. The NCP1080
gate driver supports an external MOSFET with high Vth and
high input gate capacitance. A second LDO regulator steps
down the VDDH voltage to a 3.3 V output on VDDL. VDDL
powers the analog circuitry of the DCDC controller.
In order to prevent uncontrolled operations, both regulators
include poweronreset (POR) detectors which prevent the
DCDC controller from operating when either VDDH or
VDDL is too low. In addition, an overvoltage lockout
(OVLO) on the VDDH supply disables the gate driver in case
of an openloop converter with a configuration using the bias
winding of the transformer (see Figure 4).
Both VDDH and VDDL regulators turn on as soon as
VPORT reaches the Vuvlo_on threshold.
Error Amplifier
In nonisolated converter topologies, the high gain
internal error amplifier of the NCP1080 and the internal
1.2 V reference voltage regulate the DCDC output voltage.
In this configuration, the feedback loop compensation
network should be inserted between the FB and COMP pins
as shown in Figures 3, 4 and 5.
In isolated topologies the error amplifier is not used
because it is already implemented externally with the shunt
regulator on the secondary side of the DCDC controller
(see Figure 2). Therefore the FB pin must be strapped to
ARTN and the output transistor of the optocoupler has to
be connected on the COMP pin where an internal 5 kW
pullup resistor is tied to the VDDL supply (see Figure 11).
SoftStart
The softstart function provided by the NCP1080 allows
the output voltage to ramp up in a controlled fashion,
eliminating output voltage overshoot. This function is
programmed by connecting a capacitor C
SS
between the SS
and ARTN pins.
While the DCDC controller is in POR, the capacitor C
SS
is fully discharged. After coming out of POR, an internal
current source of 5 mA typically starts charging the capacitor
C
SS
to initiate softstart. When the voltage on SS pin has
reached 0.45 V (typical), the gate driver is enabled and
DCDC operation starts with a duty cycle limit which
increases with the SS pin voltage. The softstart function is
finished when the SS pin voltage goes above 1.6 V for which
the duty cycle limit reaches its maximum value of 80%.
Softstart can be programmed by using the following
equation:
t
SS
(ms) + 0.23 C
SS
(nF)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1080DER2G | 功能描述:直流/直流开关转换器 POE-PD 13W DC-DC RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| NCP1081 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Integrated High Power PoE-PD Interface & DC-DC Converter Controller |
| NCP1081DEG | 功能描述:DC/DC 开关控制器 POE-PD 40W DC-DC RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| NCP1081DER2G | 功能描述:DC/DC 开关控制器 POE-PD 40W DC-DC RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| NCP1081SPCGEVB | 功能描述:电源管理IC开发工具 HPOWER POE-PD SPLITTER RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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