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SB380 датащи(PDF) 2 Page - Fairchild Semiconductor

номер детали SB380
подробное описание детали  Power Switch (FPS?? FSL1x7 to Low- Power Supplies
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производитель  FAIRCHILD [Fairchild Semiconductor]
домашняя страница  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

SB380 датащи(HTML) 2 Page - Fairchild Semiconductor

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AN-9719
APPLICATION NOTE
© 2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.0 • 11/2/10
2
2. Device Block Description
2.1 Startup Circuit
For startup, the HV pin is connected to the line input or bulk
capacitor through external resistor RHV, as shown in Figure
2. Typical startup current is 3.5mA and it charges the VDD
capacitor (CDD) through resistor RHV. The startup current
turns off when the VDD capacitor voltage reaches VDD-ON.
The VDD capacitor maintains VDD until the auxiliary
winding of the transformer provides the operating current.
Figure 2. Startup Circuit
2.2 Soft-Start
The FSL-series has internal soft-start circuit that slowly
increases the SenseFET current during startup. The typical
soft-start time is 5ms, during which the VLimit level is
increased in six steps to smoothly establish the required
output voltage, as shown in Figure 3. It also helps prevent
transformer saturation and reduce stress on the secondary
diode during startup.
Figure 3. Soft-Start Function
2.3 Green Mode Operation
The FSL-series uses feedback voltage (VFB) as an indicator
of the output load and modulates the PWM frequency, as
shown in Figure 4, such that the switching frequency
decreases as load decreases. In heavy-load conditions, the
switching frequency is 100kHz. Once VFB decreases below
VFB-N (2.5V), the PWM frequency starts to linearly decrease
from 100kHz to 18kHz to reduce the switching losses. As
VFB decreases below VFB-G (2.4V), the switching frequency
is fixed at 18kHz and FSL-series enters “deep” green mode
to reduce the standby power consumption. As VFB decreases
below VFB-ZDC (2.1V), FSL-series enters into burst-mode
operation. When VFB drops below VFB-ZDC, FSL-series stops
switching and the output voltage starts to drop, which
causes the feedback voltage to rise. Once VFB rises above
VFB-ZDC, switching resumes. Burst mode alternately enables
and disables switching, thereby reducing switching loss to
improve power saving, as shown in Figure 5.
Figure 4. PWM Frequency
Figure 5. Bust-Mode Operation


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