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参数资料
| 型号： | FSL106MR |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | IC PWM/SEMSEFET SMPS 0.5A 8-DIP |
| 标准包装： | 50 |
| 系列： | FPS™ |
| 输出隔离： | 隔离 |
| 频率范围： | 90kHz ~ 110kHz |
| 输入电压： | 9 V ~ 26 V |
| 输出电压： | 650V |
| 功率（瓦特）： | 13W |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-DIP |
| 包装： | 管件 |
Functional Description
Startup
At startup, an internal high-voltage current source
supplies the internal bias and charges the external
capacitor (C A ) connected with the V CC pin, as illustrated
in Figure 14. When V CC reaches the start voltage of 12V,
the FPS? begins switching and the internal high-
voltage current source is disabled. The FPS continues
normal switching operation and the power is provided
from the auxiliary transformer winding unless V CC goes
below the stop voltage of 8V.
Feedback Control
FSL106MR employs current-mode control, as shown in
Figure 16. An opto-coupler (such as the FOD817A) and
shunt regulator (such as the KA431) are typically used
to implement the feedback network. Comparing the
feedback voltage with the voltage across the R SENSE
resistor makes it possible to control the switching duty
cycle. When the shunt regulator reference pin voltage
exceeds the internal reference voltage of 2.5V, the opto-
coupler LED current increases, the feedback voltage V FB
is pulled down, and the duty cycle is reduced. This
typically occurs when the input voltage is increased or
the output load is decreased.
Figure 14. Startup Circuit
Oscillator Block
The oscillator frequency is set internally and the FPS
has a random frequency fluctuation function.
Fluctuation of the switching frequency of a switched
power supply can reduce EMI by spreading the energy
over a wider frequency range than the bandwidth
measured by the EMI test equipment. The amount of
EMI reduction is directly related to the range of the
frequency variation. The range of frequency variation is
fixed internally; however, its selection is randomly
chosen by the combination of external feedback voltage
and internal free-running oscillator. This randomly
chosen switching frequency effectively spreads the EMI
noise nearby switching frequency and allows the use of
a cost-effective inductor instead of an AC input line filter
to satisfy the world-wide EMI requirements.
Figure 15. Frequency Fluctuation Waveform
? 2010 Fairchild Semiconductor Corporation
FSL106MR ? Rev. 1.0.3
9
Figure 16. Pulse-Width-Modulation Circuit
Leading-Edge Blanking (LEB)
At the instant the internal SenseFET is turned on, the
primary-side capacitance and secondary-side rectifier
diode reverse recovery typically cause a high-current
spike through the SenseFET. Excessive voltage across
the R SENSE resistor leads to incorrect feedback operation
in the current-mode PWM control. To counter this effect,
the FPS employs a leading-edge blanking (LEB) circuit
( see the Figure 16 ). This circuit inhibits the PWM
comparator for a short time (t LEB ) after the SenseFET is
turned on.
Protection Circuits
The FPS has several protective functions, such as
overload protection (OLP), over-voltage protection
(OVP), output short-circuit protection (OSP), under-
voltage lockout (UVLO), abnormal over-current
protection (AOCP), and thermal shutdown (TSD).
Because these various protection circuits are fully
integrated inside the IC without external components,
reliability is improved without increasing cost. Once a
fault condition occurs, switching is terminated and the
SenseFET remains off. This causes V CC to fall. When
V CC reaches the UVLO stop voltage V STOP (8V), the
protection is reset and the internal high-voltage current
source charges the V CC capacitor via the V STR pin. When
V CC reaches the UVLO start voltage V START (12V), the
FPS resumes normal operation. In this manner, the
auto-restart can alternately enable and disable the
switching of the power SenseFET until the fault
condition is eliminated.
www.fairchildsemi.com
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