参数资料
型号: FLS1700XS
厂商: Fairchild Semiconductor
文件页数: 11/13页
文件大小: 0K
描述: IC CTLR FPS HALF BRIDG LCC 9-SIP
标准包装: 19
系列: FLS
输出数: 1
内部驱动器:
类型 - 主要: 通用
频率: 94kHz ~ 106kHz
安装类型: 通孔
封装/外壳: 9-SSIP
供应商设备封装: 9-SIP
包装: 管件
工作温度: -40°C ~ 130°C
5.3 Over-Voltage Protection (OVP) : When the LV CC
reaches 23V, OVP is triggered. This protection is used
when auxiliary winding of the transformer to supply V CC
to the FPS? is utilized.
5.4 Thermal Shutdown (TSD) : Having the MOSFETs
and the control IC in one package makes it easier for
the control IC to detect the abnormal over-temperature
of the MOSFETs. If the temperature exceeds
approximately 130 ° C, thermal shutdown triggers.
6. Current Sensing Using a Resistor: FLS-XS series
senses drain current as a negative voltage, as shown in
Figure 23 and Figure 24. Half-wave sensing allows low
power dissipation in the sensing resistor; while full-wave
sensing has less switching noise in the sensing signal.
Cr
7. PCB Layout Guidelines : Duty imbalance problems
may occur due to the radiated noise from the main
transformer, the inequality of the secondary side-leakage
inductances of main transformer, and so on. This is one
of the reasons that the control components in the vicinity
of R T pin are enclosed by the primary current flow pattern
on PCB layout. The direction of the magnetic field on the
components caused by the primary current flow is
changed when the high- and low-side MOSFET turn on
by turns. The magnetic fields with opposite directions
induce a current through, into, or out of the R T pin, which
changes the turn-on duration of each MOSFET. It is
strongly recommended to separate the control
components in the vicinity of R T pin from the primary
current flow pattern on PCB layout. Figure 25 shows an
example for the duty-balanced case.
Np
Ns
Ns
Control
IC
V CS
CS
R sense
SG
PG
Ids
I ds
V CS
Figure 25. Example for Duty Balancing
Figure 23. Half-Wave Sensing
I ds
V CS
Cr
Control
V CS
CS
IC
SG
PG
R sense
Np
Ns
Ns
Ids
Figure 24. Full-Wave Sensing
? 2010 Fairchild Semiconductor Corporation
FLS-XS Series ? Rev.1.0.0
11
www.fairchildsemi.com
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相关代理商/技术参数
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