收藏本站
?
VC bias through Constant current circuit
Select an NPN transistor with V CEO equal or higher
than the input voltage (Vin) plus any expected
transient voltage and capable of handling the
expected maximum power dissipation. Any NPN
transistor with V CEO ≥ 100V in a small foot print is
suitable. An exemplary NPN is FJV1845 from
Fairchild:
From the FJV1845 datasheet:
NPN Silicon Transistor
V CEO = 120V Collector-Emitter maximum voltage
I C = 50mA maximum collector current
h FE = 150 minimum at I C =3mA
V BE(sat) = 0.55V to 0.65V Base-Emitter saturation
voltage at 25°C
Select Zener Diode: Select the Zener diode with low
bias current, a Zener diode with V Z =10 in small foot
print is suitable for this application. An exemplary
Zener diode MM3Z10VST1 from ON Semiconductor
From the MM3Z10VST1 datasheet:
10V, 200mW Zener Diode
V Z = 9.80V to 10.2V Zener voltage range
I R = 10μ A will hold the Zener breakdown voltage
at 9.8V
Pd Q 2 ? 2 . 29 mA ? [ 60 V ? 11 V ? ( 9 . 8 V ? 0 . 7 V )] ? 91 . 37 mW
The transistor Power De-rating vs. temperature curve
in the manufacturer datasheet shows that the device
can operate up to 110°C.
Figure 18: PI2007 in high side +48V application, VC
R LIMIT ?
V Z _ MIN ? V BE ( on )
I VC _ MAX
?
9.8 V ? 0.7 V
2 . 1 mA
? 4 . 33 k ?
is biased through constant current circuit.
Fault Indication:
Or 4.32kΩ 1%
PI2007 SGND pin in this application is floating and
I B _ MAX ?
I C _ MAX
h FE _ MIN
?
3.5 mA
150
? 23 . 33 ? A
FT is referenced to SGND. The FT output can be
referenced to system return (RTN) by adding a level
shift circuit as shown in Figure 19.
Q1: 2SA1579T106R, 120V PNP transistor from
R Z Calculation:
Use 100μA as mini mum for the Zener diode reverse
leakage current and Q2 base current combined.
Rohm.
Q2: DTC114EET1G, 50V NPN with bias resistors from
ON semiconductor.
R Z ?
V in _ MIN ? V Z _ MAX
I Z ? I B _ MAX
?
36 V ? 10.2 V
100 ? A
? 258 k ?
D1: 30V general purpose diode.
Select R Z = 249kΩ 1%
V Z _ MAX ? V BE _ MIN 10 . 2 V ? 0 . 50 V
I C _ MAX ? ?
Maximum Q2 collector current:
R LIMIT _ MIN 4 . 32 k ? * 0 . 98
? 2 . 29 mA
Maximum Q2 power dissipation
Pd Q 2 ? I C _ MAX ? [ Vin MAX ? V VC ? CLM ? ( V Z _ MIN ? V EB _ MAX )]
Figure 19: FT level shift circuitry
Picor Corporation ? picorpower.com
PI2007
Rev 1.3
Page 15 of 19
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
PI2126-EVAL1 EVALUATION BOARD FOR PI2126
PI2127-EVAL1 EVAL BRD FOR PI2127 60V/12A
PI2161-EVAL1 EVALUATION BOARD FOR PI2161
PI2211-EVAL1 BOARD EVAL FOR PI2211
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
相关代理商/技术参数
PI200MC-A4 制造商:AMI 制造商全称:AMI 功能描述:200DPI CIS Module
PI201M-A4 制造商:AMI 制造商全称:AMI 功能描述:200DPI CIS Sensor
PI20-5,08 功能描述:可插拔接线端子 PCB Hdr, 45 Deg, 5,08 PitchOpen End, 20pole, 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:
PI-205M 制造商:Polycase 功能描述:Enclosure, Computer, Desktop, ABS,UL94-5VA, Blue, 4x3x1.375 In, For Raspberry Pi
PI2061-00-QEIG 制造商:Vicor Corporation 功能描述:PI2061 Series 8.5 - 10.5 V 4 A Load Disconnect Switch Controller IC - TDFN-10
PI207MC-A4 制造商:AMI 制造商全称:AMI 功能描述:200DPI CIS Module
PI2121 制造商:VICOR 制造商全称:Vicor Corporation 功能描述:8 Volt, 24 Amp Full-Function Active ORing Solution
PI2121-00-LGIZ 功能描述:IC OR CTRLR N-CH 17LGA RoHS:是 类别:集成电路 (IC) >> PMIC - O 圈控制器 系列:Picor®, Cool-ORing® 标准包装:1,000 系列:- 应用:电池备份，工业/汽车，大电流开关 FET 型:- 输出数:5 内部开关:是 延迟时间 - 开启:100ns 延迟时间 - 关闭:- 电源电压:3 V ~ 5.5 V 电流 - 电源:250µA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:带卷 (TR)