- 您现在的位置：买卖IC网 > Datasheet目录326 > FL103M (Fairchild Semiconductor)IC PWM CTLR FLYBACK 8-SOIC Datasheet资料下载
参数资料
| 型号： | FL103M |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTLR FLYBACK 8-SOIC |
| 标准包装： | 2,500 |
| 系列： | TRUECURRENT™ |
| 恒定电流： | 是 |
| 恒定电压： | 是 |
| 拓扑： | 交直流离线开关，反激式，PWM |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 通用 |
| 频率： | 33kHz，50kHz |
| 电源电压： | 8 V ~ 25 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
Functional Description
Figure 20.
Basic Circuit of a PSR Flyback Converter for LED Illumination
Figure 20 shows the basic circuit diagram of a primary-
side regulated flyback converter with typical
waveforms shown in Figure 21. Generally,
Discontinuous Conduction Mode (DCM) operation is
preferred for primary-side regulation since it allows
better output regulation.
The operation principles of DCM flyback converter are
as follows:
Stage I
During the MOSFET on time (t ON ), input voltage (V DC ) is
applied across the primary-side inductor (L m ). Then
MOSFET current (I DS ) increases linearly from zero to the
peak value (I PK ). During this time, the energy is drawn
from the input and stored in the inductor.
Stage II
When the MOSFET (Q1) is turned off, the energy stored
in the inductor forces the rectifier diode (D F ) to be turned
on. While the diode is conducting, the output voltage
I
PK
×
N
N
P
S
(V O ), together with diode forward-voltage drop (V F ), is
applied across the secondary-side inductor and the
diode current (I F ) decreases linearly from the peak value
(I PK × N P /N S ) to zero. At the end of inductor current
discharge time (t DIS ), all the energy stored in the
inductor has been delivered to the output.
Stage III
V F ×
N A
N S
V O ×
N A
N S
When the diode current reaches zero, the transformer
auxiliary winding voltage (V A ) begins to oscillate by the
resonance between the primary-side inductor (L m ) and
the effective capacitor loaded across MOSFET (Q1).
Constant Voltage Regulation
During the inductor current discharge time (t DIS ), the
sum of output voltage (V O ) and diode forward-voltage
drop (V F ) is reflected to the auxiliary winding side as
Figure 21.
Waveforms of DCM Flyback Converter
(V O +V F ) × N A /N S . Since the diode forward-voltage drop
(V F ) decreases as current decreases, the auxiliary
winding voltage (V A ) reflects the output voltage (V O ) at
the end of diode conduction time (t DIS ), where the diode
current (I F ) diminishes to zero. By sampling the winding
? 2012 Fairchild Semiconductor Corporation
FL103 ? Rev. 1.0.2
10
www.fairchildsemi.com
相关PDF资料 |
PDF描述 |
|---|---|
| FL6300AMY | IC CTLR PWM QUASI CURR 8-SOIC |
| FL7701MX | IC LED DRIVER PFC BUCK 8-SOIC |
| FL7732M_F116 | IC LED DRIVER PFC PRIMARY 8-SOIC |
| FLASHPRO LITE | KIT PROGRAMMER FLASHPRO LITE |
| FLS2100XS | IC CTLR FPS HALF BRIDG LCC 9-SIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| FL1041 | 制造商:Pulse 功能描述:- Bulk |
| FL1043 | 制造商:Pulse 功能描述:10BT FILTER WITH CMC - Bulk 制造商:Pulse Electronics Corporation 功能描述:10BT FILTER WITH CMC |
| FL1046 | 制造商:Pulse 功能描述:10BTFILTERWITHCMC - Bulk |
| FL1046NL | 制造商:Pulse 功能描述:10BTFILTERWITHCMC HAZMAT - Bulk |
| FL1057-002 | 制造商:Pulse 功能描述:- Bulk |
发布紧急采购，3分钟左右您将得到回复。