- 您现在的位置：买卖IC网 > PDF目录15225 > FAN6300AMY (Fairchild Semiconductor)IC REG CTRLR FLYBK ISO PWM 8SOIC PDF资料下载
参数资料
| 型号： | FAN6300AMY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/14页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO PWM 8SOIC |
| 标准包装： | 1 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 100kHz |
| 电源电压： | 8 V ~ 25 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 其它名称： | FAN6300AMYDKR |
Operation Description
The FAN6300A/H PWM controller integrates designs to
enhance the performance of flyback converters. An
internal valley voltage detector ensures power system
operates at Quasi-Resonant (QR) operation across a
wide range of line voltage. The following descriptions
highlight some of the features of the FAN6300A/H.
Startup Current
For startup, the HV pin is connected to the line input or
bulk capacitor through an external diode and resistor,
R HV , which are recommended as 1N4007 and 100 k ? .
Typical startup current drawn from the HV pin is 1.2 mA
and it charges the hold-up capacitor through the diode
and resistor. When the V DD voltage level reaches V DD-ON ,
the startup current switches off. At this moment, the V DD
capacitor only supplies the FAN6300A/H to maintain V DD
until the auxiliary winding of the main transformer
provides the operating current.
Valley Detection
The DET pin is connected to an auxiliary winding of the
transformer via resistors of the divider to generate a
valley signal once the secondary-side switching current
discharges to zero. It detects the valley voltage of the
switching waveform to achieve the valley voltage
switching. This ensures QR operation, minimizes
switching losses, and reduces EMI. Figure 17 shows
divider resistors R DET and R A . R DET is recommended as
150 k ? to 220 k ? to achieve valley voltage switching.
When V AUX (in Figure 17) is negative, the DET pin
Green-Mode Operation
The proprietary green-mode function provides off-time
modulation to linearly decrease the switching frequency
under light-load conditions. V FB , which is derived from
the voltage feedback loop, is taken as the reference. In
linearly with lower V FB . The valley voltage detection
signal does not start until t OFF-MIN finishes. Therefore, the
valley detect circuit is activated until t OFF-MIN finishes,
which decreases the switching frequency and provides
extended valley voltage switching. However, in very light
load condition, it might fail to detect the valley voltage
after the t OFF-MIN expires. Under this condition, an internal
t TIME-OUT signal initiates a new cycle start after a 9 μs
delay ( with 5 μs delay for H version). Figure 20 and
t O F F -M I N
2 .1 m s
38/13 μ s
8 /3 μ s
voltage is clamped to 0.3 V.
1 .2 V
2 .1 V
V FB
Figure 19. V FB vs. t OFF-MIN Curve
Figure 17. Valley Detect Section
The internal timer (minimum t OFF time) prevents gate
retriggering within 8 μs (3 μs for H version) after the gate
signal going-low transition. The minimum t OFF limit
Figure 20. QR Operation in Extended Valley Voltage
Detection Mode
shows a typical drain voltage waveform with first valley
switching.
Figure 21. Internal t TIME-OUT Initiates New Cycle After
Figure 18. First Valley Switching
? 2009 Fairchild Semiconductor Corporation
FAN6300A / FAN6300H ? Rev. 1.0.2
11
Failure to Detect Valley Voltage
(with 5 μs Delay for FAN6300H version)
www.fairchildsemi.com
相关PDF资料 |
PDF描述 |
|---|---|
| RSM15DRMI | CONN EDGECARD 30POS .156 SQ WW |
| RMM15DRMI | CONN EDGECARD 30POS .156 SQ WW |
| RCM40DCTI | CONN EDGECARD 80POS DIP .156 SLD |
| EBA35DRMH | CONN EDGECARD 70POS .125 SQ WW |
| GCA50DCBN | CONN EDGECARD 100PS R/A .125 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN6300ANY | 功能描述:电流型 PWM 控制器 HI-INTEGRD QUASI-RES CURR MODE PWM 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 |
| FAN6300DY | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN6300DZ | 功能描述:电流型 PWM 控制器 Quasi-Resonant Crnt. Mode PWM Cont. 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 |
| FAN6300H | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Highly Integrated Quasi-Resonant Current Mode PWM Controller |
| FAN6300HMY | 功能描述:开关变换器、稳压器与控制器 Hi-Int QuasiResonant Curr Mode PWM Cont 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 |
发布紧急采购，3分钟左右您将得到回复。