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参数资料
| 型号： | FAN6208MY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 8/18页 |
| 文件大小： | 0K |
| 描述： | IC CTLR SR SYNC RECT LLC 8-SOIC |
| 标准包装： | 2,500 |
| 输出隔离： | 隔离 |
| 输入电压： | 9.3 V ~ 28 V |
| 输出电压： | 12V |
| 功率（瓦特）： | 1W |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOP |
| 包装： | 带卷 (TR) |
Function Description
Operation Principle
FAN6208 is a secondary-side synchronous rectifier
controller for LLC or LC resonant converters that drive
two synchronous rectifier MOSFETs. Figure 7 is the
40
20
V DS.SR1
(a) Heavy-Load Condition
simplified circuit diagram of an LLC converter. The
FAN6208 determines SR MOSFET turn-on/off timing by
detecting the drain-to-source voltage of each SR
MOSFET. The key waveforms for LLC resonant
converter for below resonance and above resonance
0
1
0
-1
Ip
are shown in Figure 8 and Figure 9, respectively.
I SR1
V IN
I P
Secondary-Side Synchronous Rectifiers
SR1
8
6
4
2
0
Lr
L m
DETL1 GATE1
V O
V DS.SR1
(b) Light-Load Condition
DETL2 GND
40
RP
GATE2
Cr
FD
VDD
FAN6208
20
LLC Resonant Converter
SR2
0
Ip
Figure 7. Simplified Schematic of LLC Converter
1
0
40
20
V DS.SR1
(a) Heavy-Load Condition
-1
8
6
4
I SR1
0
1
0
Ip
2
0
Figure 9. Key Waveforms of LLC Resonant Converter for
Above Resonance Operation
-1
Timing Estimator
10
8
6
4
2
0
I SR1
the body diode of SR begins conducting, the drain-to-
source voltage drops to zero, which causes DETL pin
voltage to drop to zero. FAN6208 turns on the MOSFET
after t ON-ON-DETL (about 350 ns), when voltage on DETL
40
20
0
1
0
-1
V DS.SR1
Ip
(b) Light-Load Condition
drops below 2 V. As depicted in Figure 11, the turn-on
delay (after t SR-ON-DETL ) is the sum of debounce time
(150 ns) and propagation delay (200 ns).
FAN6208 measures the SR conduction duration (t DETL ),
during which DETL stays lower than 2 V, and uses this
information to determine the turn-off instant of SR gates
of the next switching cycle. The turn-off timing is
obtained by subtracting a dead time (t DEAD ) from the
measured SR conduction duration of the previous
switching cycle. The dead time can be programmed
8
6
4
I SR1
using a resistor on the RP pin and the relationship
between the dead time and SR conduction duration
(t DETL ) for different resistor values on RP pin is given in
2
0
Figure 8. Key Waveforms of LLC Resonant Converter for
Below Resonance Operation
? 2010 Fairchild Semiconductor Corporation
FAN6208 ? Rev. 1.0.4
8
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN6208MY_12 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Secondary-Side Synchronous Rectifier Controller for LLC Topology |
| FAN-6-20K | 制造商:MERRIMAC 制造商全称:MERRIMAC 功能描述:FIXED COAXIAL ATTENUATORS |
| FAN6210 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Primary-Side Synchronous Rectifier (SR) Trigger Controller for Dual Forward Converter |
| FAN6210_10 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Primary-Side Synchronous Rectifier (SR) Trigger Controller |
| FAN6210MY | 功能描述:初级与次级侧 PWM 控制器 Primary-Side Sync. Rect. Signal Trigger RoHS:否 制造商:ON Semiconductor 输出端数量:1 开关频率:250 KHz 工作电源电压:- 0.3 V to + 28 V 最大工作温度:+ 85 C 最小工作温度:- 5 C 封装 / 箱体:SOIC-8 Narrow 封装:Reel |
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