收藏本站
? ? ??
UV/EN and OV:
Figure 7 depicts the divided down BUS voltage, monitored on
the UV/EN and OV pins respectively and the "fault" state of
the PI2211. The over-voltage (OV) pin will disable (fault) the
PI2211 once the voltage on the OV pin reaches 0.750Vdc. It
will re-enable (fault clear) the controller once the voltage
drops below 0.675Vdc.
The UV/EN pin monitors for under-voltage faults and also
provides a means of disabling the part via an external control.
The part becomes enabled once the voltage on the UV/EN pin
exceeds 0.575Vdc. To disable the part, the voltage on the
UV/EN pin must be below 0.375Vdc. A UV fault occurs when
the voltage on the UV/EN pin drops below 0.675Vdc,
disabling the controller. The fault is cleared and the controller
re- enabled, when the UV/EN pin’s voltage exceeds 0.75Vdc.
Glitch-less Turn-off: Transient Turnoff Glitch- Catcher?
During a circuit breaker event, uncontrolled turn off of the
series MOSFET can cause voltage ringing on the BUS due to
the stored energy in components and copper traces. To
maintain BUS voltage stability the PI2211 uses a glitch-less
turn-off mechanism whereby the MOSFET gate is initially
?
PI2211
??
discharged rapidly, then in a slower controlled discharged to
a full "off" state. This allows the stored energy to pass
through the MOSFET into the low impedance load, keeping
the BUS voltage ringing to a controlled maximum value, well
below the avalanche voltage rating of the MOSFET. Acting as
an active snubber this provides the same protection as having
a voltage suppressor on the BUS. Figure 8 shows a simplified
block diagram of the Glitch- Catcher? circuit.
Figure 8 - Glitch- Catcher? Over -current fault detection circuit.
Figure 9 - Circuit Breaker (CB) and Glitch- Catcher? waveforms.
Figure 9 represents the typical response waveforms of the
PI2211 Glitch- Catcher? to a circuit breaker (CB) event. After
the CB detection delay, the MOSFET gate gets discharged
with an 80mA discharge current until there is a positive dv/dt
on the drain. The discharge current is reduced to 8mA which
slows the drain voltage over-shoot until the drain - high
Picor Corporation · picorpower.com
PI2211
Rev 1.0, Page 12 of 26
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
PI5101-EVAL1 EVALUATION BOARD FOR PI5101
PICOSMDC035S-2 POLYSWITCH PTC RESET .35A 0805
PIIPM25P12B008X IC PWR MODULE PROG ISO 25A 1200V
PK3020KB KIT KEYPAD, MOUSE, AND USB HUB
PK3021LI KIT LIGHT, MOUSE, AND USB HUB
PK3022ET KIT CAT5 CABLE MOUSE USB HUB
PKSERIAL-I2C1 BOARD DEMO PICKIT SERIAL I2C
PKSERIAL-SPI1 BOARD DEMO PICKIT SERIAL SPI
相关代理商/技术参数
PI223MC-A6 制造商:AMI 制造商全称:AMI 功能描述:200DPI CIS Sensor
PI224MC-A6 制造商:AMI 制造商全称:AMI 功能描述:200DPI CIS Sensor
PI22-5,08 功能描述:可插拔接线端子 PCB Hdr, 45 Deg, 5,08 PitchOpen End, 22pole, 12A,300V,Grn RoHS:否 制造商:Phoenix Contact 产品:Plugs 系列:PTS 端接类型:Spring Cage 位置/触点数量:5 线规量程:26-14 节距:5 mm 电流额定值:10 A 电压额定值:250 V 安装风格: 安装角: 触点电镀:
PI225MC-A6 制造商:AMI 制造商全称:AMI 功能描述:200DPI CIS Sensor
PI226M-A4 制造商:AMI 制造商全称:AMI 功能描述:200DPI CIS Sensor
PI227 制造商:AMI 制造商全称:AMI 功能描述:200DPI CIS Sensor
PI227MC-A4 制造商:AMI 制造商全称:AMI 功能描述:200DPI CIS Sensor
PI228MC-A4 制造商:AMI 制造商全称:AMI 功能描述:200DPI CIS Sensor