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| 型号： | FAN7621N |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/17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) |
from an initial high frequency ( f
) until the output
implemented by sweeping down the switching frequency
ISS
voltage is established. The soft-start circuit is made by
connecting R-C series network on the R T pin, as shown
in Figure 19. FAN7621 also has an internal soft-start for
3ms to reduce the current overshoot during the initial
V CC
LV CC
HV CC
cycles, which adds 40kHz to the initial frequency of the
external soft-start circuit, as shown in Figure 20. The
initial frequency of the soft-start is given as:
R max
R min
R SS
RT
HO
f ISS = (
5.2 k Ω
R min
+
5.2 k Ω
R SS
) × 100 + 40 ( kHz )
(3)
C SS
CON
CTR
It is typical to set the initial (soft-start) frequency of two ~
three times the resonant frequency ( f O ) of the resonant
network.
The soft-start time is three to four times the RC time
constant. The RC time constant is as follows:
CS
SG
LO
PG
T SS = R SS ? C SS
f s
(4)
Figure 22. Control Pin Configuration for
f
ISS
40kHz
Control loop
take over
Pulse Skipping
Remote On / Off : When an auxiliary power supply is
used for standby, the main power stage using FAN7621
can be shut down by pulling down the control pin
voltage, as shown in Figure 23. R1 and C1 are used to
ensure soft-start when switching resumes.
time
Figure 20. Frequency Sweeping of Soft-Start
4. Control Pin
The FAN7621 has a control pin for protection, cycle
R1
C1
OP1
Main
Output
skipping, and remote on/off. Figure 21 shows the internal
block diagram for control pin.
FAN7621
Main Off
CON
6
LV CC
I OLP
-
R T
R min
Aux
Output
0.4 / 0.6V
+
OLP
5V
+
-
S
Q
Stop Switching
CON
LV CC
23V
+
-
LV CC good
R -Q
Auto-restart
protection
OP1
OVP
Figure 21. Internal Block of Control Pin
Protection : When the control pin voltage exceeds 5V,
protection is triggered. Detailed applications are
described in the protection section.
Pulse Skipping : FAN7621 stops switching when the
control pin voltage drops below 0.4V and resumes
switching when the control pin voltage rises above 0.6V.
To use pulse-skipping, the control pin should be
connected to the opto-coupler collector pin. The
frequency that causes pulse skipping is given as:
Figure 23. Remote On / Off Circuit
5. Protection Circuits
The FAN7621 has several self-protective functions, such
as Overload Protection (OLP), Over-Current Protection
(OCP), Abnormal Over-Current Protection (AOCP),
Over-Voltage Protection (OVP), and Thermal Shutdown
(TSD). OLP, OCP, and OVP are auto-restart mode
protections; while AOCP and TSD are latch-mode
protections, as shown in Figure 24.
5.1 Auto-Restart Mode Protection : Once a fault
SKIP
=
5 . 2 k
R min
+
4 . 16 k
R max
x 100 ( kHz )
(5)
condition is detected, switching is terminated and the
MOSFETs remain off. When LV CC falls to the LV CC stop
voltage of 11.3V, the protection is reset. FAN7621
? 2009 Fairchild Semiconductor Corporation
FAN7621 ? Rev. 1.0.3
10
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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