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| 型号： | FAN7621N |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC OFF-LINE CTRLR PROG PFM 16DIP |
| 标准包装： | 25 |
| 输出隔离： | 隔离 |
| 频率范围： | 94kHz ~ 106kHz |
| 功率（瓦特）： | 1.56W |
| 工作温度： | -40°C ~ 130°C |
| 封装/外壳： | 16-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 16-DIP |
| 包装： | 管件 |
| 产品目录页面： | 1222 (CN2011-ZH PDF) |
resonant capacitor voltage (V cr ) is proportional to the
resonant current in the primary side (I p ) as:
resumes normal operation when LV CC reaches the start
voltage of 14.5V.
5.2 Latch-Mode Protection : Once this protection is
triggered, switching is terminated and the gate output
signals remain off. The latch is reset only when LV CC is
discharged below 5V.
LV CC
5.4 Current Sensing Using Resonant Capacitor
Voltage : For high-power applications, current sensing
using a resistor may not be available due to the severe
power dissipation in the resistor. In that case, indirect
current sensing using the resonant capacitor voltage can
be a good alternative because the amplitude of the
p-p
p-p
11/ 14 V
12
+
-
LV CC good
V RE F
Internal
Bias
V Cr p ? p =
I p p ? p
2 π f s C r
(6)
To minimize power dissipation, a capacitive voltage
C DL
I p
OCP
OLP
OVP
LV CC good
CON
20k
Auto-restart
protection
S Q
R -Q
F/F
Latch
protection
Q S
-Q R
F/F
Shutdown
AOCP
TSD
LV CC < 5V
divider is generally used for capacitor voltage sensing,
as shown in Figure 27.
LV CC
HV CC
RT
HO
Figure 24. Protection Blocks
CON
CTR
5.3 Current Sensing Using Resistor : FAN7621
senses drain current as a negative voltage, as shown in
Figure 25 and Figure 26. Half-wave sensing allows low
power dissipation in the sensing resistor, while full-wave
CS
SG
LO
PG
C sense
C B
sensing has less switching noise in the sensing signal.
LV CC
I p
V sense
100
C r
HV CC
RT
HO
C DL
CON
CTR
V Cr
V CS
CS
LO
I ds
V Crp-p
V sense B
C
=
+ C
V Cr sense B
C
R sense
SG
PG
I ds
V CS
V sense
pk
p ? p
V sense pk
2
= V CON
V sensepk
V CON
Figure 25. Half-Wave Sensing
I ds
V sensepk
t Delay =R d C d
Figure 27. Current Sensing Using Resonant
Capacitor Voltage
C DL
V CS
RT
CON
CS
LV CC
HV CC
HO
CTR
LO
V CS
5.5 Over-Current Protection (OCP) : When the
sensing pin voltage drops below -0.6V, OCP is triggered
and the MOSFETs remain off. This protection has a
shutdown time delay of 1.5μs to prevent premature
shutdown during startup.
5.6 Abnormal Over-Current Protection (AOCP) : If
the secondary rectifier diodes are shorted, large current
SG
PG
with extremely high di/dt can flow through the MOSFET
before OCP or OLP is triggered. AOCP is triggered
I ds
R sense
without shutdown delay when the sensing pin voltage
drops below -0.9V. This protection is latch mode and
Figure 26. Full-Wave Sensing
? 2009 Fairchild Semiconductor Corporation
FAN7621 ? Rev. 1.0.3
11
reset when LV CC is pulled down below 5V.
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN7621S | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:PFM Controller for Half-Bridge Resonant Converters |
| FAN7621SJ | 功能描述:功率驱动器IC PWM Control IC for High Power FPS RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| FAN7621SJX | 功能描述:功率驱动器IC PWM Control IC for High Power FPS RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| FAN7621SSJ | 功能描述:开关变换器、稳压器与控制器 Contr. for Half-Brdg Resonant Converters RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| FAN7621SSJX | 功能描述:电流型 PWM 控制器 CONTROL IC OF 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 |
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