NCP1082
http://onsemi.com
13
Ilim1
Vds_pgood
threshold
VPORTNx
Pass Switch
Inrush
I_pass_switch
NCP1082
RTN
VDS_PGOOD
0
1
VDDA1
VDDA1
1 V / 9.2 V
2 V
Current_limit_ON
&
detector
Figure 13. Inrush and Ilim1 Selection Mechanism
VDDA1
When VPORT reaches the UVLO_on level, the Cpd
capacitor is charged with the INRUSH current (in order to
limit the internal power dissipation of the passswitch).
Once the Cpd capacitor is fully charged, the current limit
switches from the inrush current to the operational current
level (ilim1) as shown in Figure 13. This transition occurs
when both following conditions are satisfied:
1. The VDS of the passswitch is below the
Vds_pgood low level (1 V typical).
2. The passswitch is no longer in current limit
mode, meaning the gate of the passswitch is
high (above 2 V typical).
The operational current limit will stay selected as long as
Vds_pgood is true (meaning that RTNVPORTN
1,2
is
below the high level of Vds_pgood). This mechanism allows
a current level transition without any current spike in the
passswitch because the operational current limit (ilim1) is
enabled once the passswitch is not limiting the current
anymore, meaning that the Cpd capacitor is fully charged.
Thermal Shutdown
The NCP1082 includes thermal protection which shuts
down the device in case of high power dissipation. Once the
thermal shutdown (TSD) threshold is exceeded, following
blocks are turned off:
" DCDC controller
" Passswitch
" VDDH and VDDL regulators
" CLASS regulator
When the TSD error disappears and if the input line
voltage is still above the UVLO level, the NCP1082
automatically restarts with the current limit set in the inrush
state, the DCDC controller is disabled and the Css
(softstart capacitor) discharged. The DCDC controller
becomes operational as soon as RTNVPORTN
1,2
is below
the Vds_pgood threshold.
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
NCP1083DEG
IC CONV CTLR POE-PD 40W 20-TSSOP
NCP1501DMR2G
IC REG SGL BUCK/LINEAR 8MICRO
NCP1578MNR2G
IC REG DL BCK/LINEAR SYNC 20-QFN
NCP1601BDR2G
IC PFC CTRL CRM/TRANSITION 8SOIC
NCP1603D100R2G
IC CTLR PFC/PWM COMBO 16-SOIC
NCP1605DR2G
IC PFC CONTROLLER CCM/DCM 16SOIC
NCP1606BDR2G
IC POWER FACTOR CONTROLLER 8SOIC
NCP1607BDR2G
IC PFC CONTROLLER CRM 8SOIC
相关代理商/技术参数
NCP1082DER2G
功能描述:直流/直流开关转换器 POE-PD 13W DC-DC AUX SUPP 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
NCP1083
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 with 9V Auxiliary Supply Support
NCP10-837R-D
制造商:Panduit Corp 功能描述:
NCP1083DEG
功能描述:DC/DC 开关控制器 POE-PD 40W DC-DC AUX SUPP 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
NCP1083DER2G
功能描述:DC/DC 开关控制器 POE-PD 40W DC-DC AUX SUPP 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
NCP1083QBCGEVB
功能描述:电源管理IC开发工具 HIGH POWER POE-PD MODULE
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
NCP1083WIRGEVB
功能描述:电源管理IC开发工具 POE-PD MODULE WITH VAUX
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
NCP1086
制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:1.5 A Adjustable and 3.3 V Fixed Output Linear Regulator