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| 型号： | FAN6208MY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/18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) |
V DD
(V DD - FD) n-1
(V DD - FD) n
t D-SHRINK-FD
RP Pin Open Protection Region
FD
(V DD - FD) n-2
V RPO (3.65V)
GATE1
(V DD - FD) n /(V DD - FD) n-1 > 120%
t SHRINK-FD
t DEAD
R RP = 68K ?
V RP = 2.822V
High- Frequency Mode
R RP = 56K ?
V RP = 2.324V
DETL1
V RPHL (1.46V)
GATE2
t SHRINK-FD
t DEAD
Low-Frequency Mode
R RP = 30K ?
V RP = 1.245V
R RP = 24K ?
V RP = 0.996V
DETL2
RP Pin Short Protection Region
V RPS (0.3V)
Figure 14. Gate Shrink by Feedback Detection
Figure 16.
RP Pin Operation
To handle abnormal conditions for IC pins, the RP pin
(c) When the DETL voltage has ringing around zero. As
depicted in Figure 8, the drain voltage of SR has
ringing around zero at light-load condition after the
switching transition of the primary-side switches.
When DETL voltage rises above 2 V within 350 ns
after DETL voltage drops to zero and stays above
2 V longer than 150 ns, the gate is shrunk by 1.2 μs
also provides open/short protection. When V RP is less
than V RPS (0.3 V) or V RP is higher than V RPO (3.65 V),
the protection is triggered. Figure 17 shows the RP pin
short protection timing sequence. If V RP < V RPS (0.3 V)
for longer than t RPOS (2 μs), FAN6208 is disabled. Figure
18 shows the RP pin open protection timing sequence.
If V RP > V RPO (3.65 V) for longer than t RPOS (2 μs),
FAN6208 is disabled.
V DETL
>150ns
200ns (t PD )
RP
t RPOS
V RP = I RP ×R RP
V RPS
t RPOS
t RPOS
<350ns (t DB +t PD )
Shrink
GATE1
DETL1
RP Short Protection Area
Soft-Start Area
V GATE
GATE2
Soft-Start Area
t DETL_LOW (n) – t DEAD – t SHRINK
t DETL_LOW (n+1)
DETL2
Figure 15. Gate Shrink by DETL Voltage
RP Pin Function
Ringing Around Zero
Figure 17. RP Pin Short Protection
RP
t RPOS
t RPOS
The RP pin programs the level of green mode and t DEAD .
V RP = I RP ×R RP
V RPO
voltage on the RP pin (open protection, short protection,
and HF/LF mode). When R RP is less than 36 K ? ,
FAN6208 operates in low-frequency mode. Green mode
is enabled when t DETL is smaller than 3.75 μs. When R RP
is larger than 36 K ? , high-frequency mode is selected
GATE1
DETL1
RP Open Protection Area
Soft-Start Area
and green mode is enabled for t DETL < 1.90 μs. t DEAD can
shows the relationship between t DEAD and t DETL for
GATE2
Soft-Start Area
different RP resistors.
DETL2
Figure 18. RP Pin Open Protection
? 2010 Fairchild Semiconductor Corporation
FAN6208 ? Rev. 1.0.4
10
www.fairchildsemi.com
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相关代理商/技术参数 |
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| 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 |
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| 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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