参数资料
| 型号： | FSFA2100 |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC SWIT OVP UVLO 9SIP |
| 标准包装： | 19 |
| 输出隔离： | 隔离 |
| 频率范围： | 94 ~ 106kHz |
| 输入电压： | 14.5 V ~ 25 V |
| 输出电压： | 650V |
| 功率（瓦特）： | 200W |
| 工作温度： | -40°C ~ 130°C |
| 封装/外壳： | 9-SIP |
| 供应商设备封装： | 9-SIP |
| 包装： | 管件 |
| 产品目录页面： | 1222 (CN2011-ZH PDF) |
true overload situation. Because of the pulse-by-pulse
current limit capability, the maximum peak current
through the MOSFET is limited; and, therefore, the
maximum input power is restricted with a given input
voltage. If the output consumes more than this maximum
power, the output voltage (V O ) decreases below the
nominal voltage. This reduces the current through the
opto-coupler diode, which also reduces the opto-coupler
transistor current, increasing the feedback voltage (V FB ).
If V FB exceeds 3V, D1, which is illustrated in Figure 19, is
blocked and the OLP current source starts to charge C B
slowly, as shown in Figure 23. In this condition, V FB
continues increasing until it reaches 7V, then the
switching operation is terminated, as shown in Figure 23.
The delay time for shutdown is the time required to
charge C B from 3V to 7V with 5μA, as given by:
Figure 21. Half-Wave Sensing
t delay =
( 7 V - 3 V ) × C B
5 μ A
(2)
I ds
A 30 ~ 50ms delay time is typical for most applications.
V CS
V O
Control
C B
7V
Overload protection
V CS
CS
IC
SG
PG
R sense
Np
Ns
Ns
3V
V FB
Vc
I ds
t delay
Figure 22. Full-Wave Sensing
I ds
t 1
t 2
I LIM
t
3.1 Pulse-by-Pulse Current Limit : In normal operation,
the duty cycle of the low-side MOSFET is determined by
comparing the internal triangular signal with the feedback
voltage. However, the low-side MOSFET is forced to turn
off when the current sense pin voltage reaches -0.58 V.
This operation limits the drain current below a pre-
determined level to avoid the destruction of the
MOSFETs.
3.2 Abnormal Over-Current Protection (AOCP) : If one
of the secondary rectifier diodes is short-circuited, large
current with extremely high di/dt can flow through the
MOSFET before OCP or OLP is triggered. AOCP is
triggered with a very short shutdown delay time when the
sensed voltage drops below -0.9 V. This protection is
latch mode and reset only when LV CC is pulled below 5 V.
3.3 Overload Protection (OLP) : Overload is defined as
the load current exceeding its nominal level due to an
unexpected abnormal event. In this situation, a protection
circuit should trigger to protect the power supply.
However, even when the power supply is in the normal
condition, the OLP circuit can be triggered during the
load transition. To avoid this undesired operation, the
OLP circuit is designed to trigger only after a specified
time to determine whether it is a transient situation or a
? 2008 Fairchild Semiconductor Corporation
FSFA2100 ? Rev. 1.0.1
11
Figure 23. Overload Protection
3.4 Over-Voltage Protection (OVP) : When the LV CC
reaches 23V, OVP is triggered. This protection is enabled
when using an auxiliary winding of the transformer to
supply LV CC to FPS.
3.5 Thermal Shutdown (TSD) : The MOSFETs and the
control IC are built in one package. This allows the
control IC to detect the abnormal over-temperature of the
MOSFET. If the temperature exceeds approximately
130 ° C, the thermal shutdown triggers.
4. Soft-Start : At startup, the duty cycle starts increasing
slowly to establish the correct working conditions for
transformers, inductors, and capacitors. The voltage on
the output capacitors is progressively increased to
smoothly establish the required output voltage. Soft-start
time is internally implemented for 15 ms (when the
operating frequency is set to 100 kHz.) In addition, to
help the soft-start operation, a capacitor and a resistor
would be connected on the R T pin externally, as shown in
Figure 24. Before the power supply is powered on, the
www.fairchildsemi.com
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相关代理商/技术参数 |
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| FSFD 10-0.5 | 制造商:TURCK Inc 功能描述:Sensor Connector 制造商:TURCK Inc 功能描述:SENSOR CONNECTOR; Cable Length:0.5m; Connector Mounting:Panel; Connector Type:Sensor; Contact Material:Brass; Contact Plating:Gold; Contact Termination:Solder; Gender:Plug; No. of Contacts:10; No. of Positions:10; Series:Eurofast ;RoHS Compliant: Yes |
| FSFD 10-1.0 | 制造商:TURCK Inc 功能描述:Receptacle, Rear Mount with Leads, 10X24 AWG |
| FSFD 12-0.5 | 制造商:TURCK Inc 功能描述:U0910-93 制造商:TURCK Inc 功能描述:Sensor Connector 制造商:TURCK Inc 功能描述:SENSOR CONNECTOR; Cable Length:0.5m; Connector Mounting:Panel; Connector Type:Sensor; Contact Material:Brass; Contact Plating:Gold; Contact Termination:Solder; Gender:Receptacle; No. of Contacts:12; No. of Positions:12 ;RoHS Compliant: Yes |
| FSFD 4.4 | 制造商:TURCK Inc 功能描述:FSFD 4.4 |
| FSFD 4.4-0.5 | 制造商:TURCK Inc 功能描述:Connector; Receptacle; 4; 22 AWG; PG 9; 4 A; 250 V; Brass; Nickel Plated Brass 制造商:TURCK Inc 功能描述:SENSOR CONNECTOR 制造商:TURCK Inc 功能描述:SENSOR CONNECTOR; For Use With:Sensors; Accessory Type:Cordset; Cable Length:0.5m; Cable Length - Imperial:1.64ft; Cable Length - Metric:500mm; Connector Mounting:Panel; Connector Type:Sensor; Connector Type B:Free / Stripped End ;RoHS Compliant: Yes |
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