参数资料
| 型号： | FSFM261N |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/18页 |
| 文件大小： | 0K |
| 描述： | IC PWM/SENSEFET FPS 8-DIP |
| 标准包装： | 50 |
| 系列： | FPS™ |
| 输出隔离： | 隔离 |
| 频率范围： | 61kHz ~ 73kHz |
| 输入电压： | 9 V ~ 21 V |
| 输出电压： | 700V |
| 功率（瓦特）： | 35W |
| 工作温度： | -25°C ~ 85°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-DIP |
| 包装： | 管件 |
where, I lim _spec is the limit current stated on the
specification; N a and N p are the number of turns for V CC
and primary side, respectively; I fb is the internal current
source at feedback pin with a typical value of 0.9mA; and
Δ I lim_comp is the current difference that must be
eliminated. In case of capacitor in the circuit 1μF, 100V is
good choice for all applications.
components, the reliability is improved without
increasing cost. Once the fault condition occurs,
switching is terminated and the SenseFET remains off.
This causes V CC to fall. When V CC reaches the UVLO
stop voltage, 8V, the protection is reset and the internal
high-voltage current source charges the V CC capacitor
via the Vstr pin. When V CC reaches the UVLO start
voltage, 12V, the FSFM260/261/300 resumes normal
operation. In this manner, the auto-restart can alternately
enable and disable the switching of the power SenseFET
until the fault condition is eliminated ( see Figure 19 ).
V DC
Np
L
3.1 Overload Protection (OLP) : Overload is defined as
the load current exceeding a pre-set level due to an
unexpected event. In this situation, the protection circuit
should be activated to protect the SMPS. However, even
when the SMPS is in the normal operation, the overload
protection circuit can be activated during the load
Vfb
Drain
transition. To avoid this undesired operation, the
overload protection circuit is designed to be activated
Vcc
Na
after a specified time to determine whether it is a
transient situation or an overload situation. Because of
the pulse-by-pulse current limit capability, the maximum
V y = V DC ×
R LIM
FSFM260 Rev. 00
I_lim
GND
R Y
C Y
-
+
compensation
network
N a
N p
peak current through the SenseFET is limited and,
therefore the maximum input power is restricted with a
given input voltage. If the output consumes beyond this
maximum power, the output voltage (V O ) decreases
below the set voltage. This reduces the current through
Figure 18. Constant Power Limit Circuit
the opto-coupler LED, which also reduces the opto-
coupler transistor current, increasing the feedback
voltage (V FB ). If V FB exceeds 2.5V, D1 is blocked and
Vds
Power
on
Fault
occurs
Fault
removed
the 5μA current source starts to charge C B slowly up to
V CC . In this condition, V FB continues increasing until it
reaches 6V, when the switching operation is terminated,
as shown in Figure 20. The delay time for shutdown is
the time required to charge C B from 2.5V to 6.0V with
5μA. In general, a 10 ~ 50ms delay time is typical for
most applications.
Vcc
12V
8V
t
V FB
6.0V
2.5V
FSFM260 Rev: 00
Overload protection
Normal
Fault
Normal
FSFM260 Rev: 00
operation
situation
operation
T 12 = Cfb*(6.0-2.5)/I delay
Figure 19. Auto Restart Operation
3. Protection Circuit: The FSFM260/261/300 has
several self protective functions, such as overload
protection (OLP), over-voltage protection (OVP), and
thermal shutdown (TSD). Because these protection
circuits are fully integrated into the IC without external
T 1
Figure 20. Overload Protection
T 2
t
? 2009 Fairchild Semiconductor Corporation
FSFM260N / FSFM261N / FSFM300N ? Rev. 1.0.1
11
www.fairchildsemi.com
相关PDF资料 |
PDF描述 |
|---|---|
| FSFR1600L | IC FPS POWER SWITCH 9-SIP |
| FSFR1600XSL | IC FPS PWR SWITCH 160W 9-SIPL |
| FSFR1700XSL | IC FPS PWR SWITCH 200W 9-SIPL |
| FSFR1800HSL | IC FPS HALF BRIDGE RES CONV 9SIP |
| FSFR1800XS | IC FPS PWR SWITCH 260W 9-SIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| FSFM300N | 功能描述:电流型 PWM 控制器 30W FPS RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| FSFP502Y | 制造商:Panduit Corp 功能描述:FIBER PLENUM ZIPCORD,50UMINTER 制造商:Panduit Corp 功能描述:FIBER PLENUM ZIPCORD,50UMINTERCONNECT CA - Cable Rools/Shrink Tubing |
| FSFP601Y | 制造商:Panduit Corp 功能描述:FIBER PLENUM SMPLX 62.5UMINTER 制造商:Panduit Corp 功能描述:FIBER PLENUM SMPLX 62.5UMINTERCONNECT CA - Cable Rools/Shrink Tubing |
| FSFP602Y | 制造商:Panduit Corp 功能描述:FIBER PLENUM ZIPCORD 62.5INTER 制造商:Panduit Corp 功能描述:FIBER PLENUM ZIPCORD 62.5INTERCONNECT CA - Cable Rools/Shrink Tubing |
| FSFP901Y | 制造商:Panduit Corp 功能描述:FIBER PLENUM SMPLX 1.6MM SM IN 制造商:Panduit Corp 功能描述:FIBER PLENUM SMPLX 1.6MM SM INTERCONNECT - Cable Rools/Shrink Tubing |
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