参数资料
| 型号： | FSFA2100 |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/16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) |
Functional Description
1. Internal Oscillator : FSFA2100 employs a current-
controlled oscillator as shown in Figure 17. Internally, the
voltage of the R T pin is regulated at 2 V and the
charging/discharging current for the oscillator capacitor
C T is determined by the current flowing out of the R T pin
(I CTC ). When the R T pin is pulled down to the ground with
a resistor R SET , the switching frequency is fixed as:
f S =
27 k Ω
R SET
× 100 ( kHz )
(1)
V REF
I CTC
+
3V
-
S
Q
I CTC
2I CTC
2V
C T
1V
+
-
R -Q
F/F
Figure 19. Internal PWM Block Diagram
R SET R T
3
3. Protection Circuits : The FSFA2100 has Overload
Protection (OLP), Abnormal
Over-Current Protection
(AOCP), Over-Voltage Protection (OVP), and Thermal
Figure 17. Current Controlled Oscillator
2. PWM Control : Figure 18 shows the typical control
circuit configuration. The opto-coupler transistor should
be connected to the V FB pin in parallel with the feedback
capacitor to control the duty cycle.
Shutdown (TSD) self-protective functions. The OLP and
OVP are auto-restart mode protections, while the AOCP
and TSD are latch-mode protections, as shown in Figure
20.
Auto-restart mode protection: Once the fault condition is
detected, the switching is terminated and the MOSFETs
remain off. When LV CC falls down to LV CC stop voltage of
around 11V, the protection is reset. The FPS resumes
normal operation when LV CC reaches the start voltage of
about 14 V.
Latch-mode protection: Once this protection is triggered,
the switching is terminated and the MOSFETs remain off.
The latch is reset only when LV CC is discharged below
5 V.
LVcc
7
11.3 / 14.5V
+
-
LV cc good
V REF
Internal Bias
Shutdown
OLP
Auto-restart
protection
Latch
protection
OVP
S
Q
Q
S
AOCP
Figure 18. PWM Control Configuration
LV cc good
V FB
R
-Q
F/F
-Q
F/F
R
TSD
LVcc < 5V
Figure 19 shows the internal block diagram for PWM
operation. Duty cycle is controlled by comparing the
feedback voltage to the triangular signal with a range
from 1 V to 3 V.
? 2008 Fairchild Semiconductor Corporation
FSFA2100 ? Rev. 1.0.1
10
Figure 20. Protection blocks
Low-side MOSFET current should be sensed for Pulse-
by-pulse current limit and AOCP. The FSFA2100 senses
drain current as a negative voltage, as shown in Figure
21 and Figure 22. Half-wave sensing allows low-power
dissipation in the sensing resistor, while full-wave sensing
has less noise in the sensing signal.
www.fairchildsemi.com
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