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参数资料
| 型号： | FAN7621SSJX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC OFF-LINE CTRLR PROG PFM 16SOP |
| 标准包装： | 2,000 |
| 输出隔离： | 隔离 |
| 频率范围： | 94kHz ~ 106kHz |
| 功率（瓦特）： | 1.13W |
| 工作温度： | -40°C ~ 130°C |
| 封装/外壳： | 16-SOIC（0.209"，5.30mm 宽） |
| 供应商设备封装： | 16-SOP |
| 包装： | 带卷 (TR) |
The soft-start time is three to four times the RC time
(a )
(b )
( a)
(b ) (a )
(b )
constant. The RC time constant is as follows:
L V CC
t SS = R SS ? C SS
f s
(4)
V AR
V C ssH
V C ssL
f
ISS
40kHz
I Cr
Control loop
take over
t stop
t S /S
(a ) P r o te ction s a r e tr igge r e d, ( b ) F S F R- U S r e sta r ts
Figure 21. Self Auto-Restart Operation
time
Figure 19. Frequency Sweeping of Soft-Start
4. Self Auto-restart : The FAN7621S can restart
automatically even if a built-in protection is triggered with
external supply voltage. As shown in Figure 20 and
Figure 21; once any protections are triggered, M1 switch
turns on and V-I converter is disabled. C SS starts to be
discharged until the V Css across C SS drops to V CssL . Then
all protections are reset, M1 turns off, and V-I converter
resumes. The FAN7621S starts switching again with soft-
5. Protection Circuits : The FAN7621S has several self-
protective functions, such as Over-Current Protection
(OCP), Abnormal Over-Current Protection (AOCP), Over-
Voltage Protection (OVP), and Thermal Shutdown (TSD).
These protections are auto-restart mode protections, as
shown in Figure 21.
Once a fault condition is detected, switching is
terminated and the MOSFETs remain off. When LV CC
falls to the LV CC stop voltage of 10V or the AR signal is
HIGH, the protection is reset. FAN7621S resumes normal
operation when LV CC reaches the start voltage of 12.5V.
start. If the protections occur while V Css is under V CssL
and V CssH level, the switching is terminated immediately,
V Css continues to increase until reaching V CssH , then C SS
is discharged by M1.
Figure 22. Protection Blocks
5.1 Over-Current Protection (OCP) : When the
sensing pin voltage drops below -0.58V, OCP is
triggered and the MOSFETs remain off. This protection
has a shutdown time delay of 1.5μs to prevent
premature shutdown during startup.
Figure 20. Internal Block of AR Pin
After protections trigger, FAN7621S is disabled during
the stop-time, t stop , where V Css decreases and reaches to
V CssL . The stop-time of FAN7621S can be estimated as:
5.2 Abnormal Over-Current Protection (AOCP) : If
the secondary rectifier diodes are shorted, large
current with extremely high di/dt can flow through the
MOSFET before OCP is triggered. AOCP is triggered
without shutdown delay when the sensing pin voltage
drops below -0.9V.
t stop = C ss ·
R ss + R min || 5 k ?
(5)
5.3 Over-Voltage Protection (OVP) : When the LV CC
reaches 23V, OVP is triggered. This protection is used
For the soft-start time, t s/s it can be set as Equation (4).
? 2009 Fairchild Semiconductor Corporation
FAN7621S ? Rev. 1.0.1
10
when auxiliary winding of the transformer to supply V CC
to the controller is utilized.
5.4 Thermal Shutdown (TSD) : If the temperature of
the junction exceeds approximately 130 ° C, the thermal
shutdown triggers.
www.fairchildsemi.com
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