DataSheet.es Q0370RNA Hoja de datos PDF


PDF Q0370RNA Datasheet ( Hoja de datos )

Número de pieza Q0370RNA
Descripción FSQ0370RNA
Fabricantes Fairchild 
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Q0370RNA datasheet

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Q0370RNA pdf
Electrical Characteristics
TA = 25°C unless otherwise specified.
Symbol
SenseFET Section(10)
Parameter
IDSS Zero-Gate-Voltage Drain Current
RDS(ON)
Drain-Source
On-State
Resistance(11)
FSQ0170RNA
FSQ0270RNA
FSQ0370RNA
www.DataSheet4U.com
CISS
Input Capacitance
FSQ0170RNA
FSQ0270RNA
FSQ0370RNA
FSQ0170RNA
COSS
Output Capacitance
FSQ0270RNA
FSQ0370RNA
CRSS
Reverse Transfer
Capacitance
FSQ0170RNA
FSQ0270RNA
FSQ0370RNA
FSQ0170RNA
td(on)
Turn-On Delay Time
FSQ0270RNA
FSQ0370RNA
FSQ0170RNA
tr Rise Time
FSQ0270RNA
FSQ0370RNA
FSQ0170RNA
td(off)
Turn-Off Delay Time
FSQ0270RNA
FSQ0370RNA
FSQ0170RNA
tf Fall Time
FSQ0270RNA
FSQ0370RNA
Control Section
fOSC
ΔfOSC
DMAX
DMIN
VSTART
VSTOP
IFB
tS/S
Switching Frequency
Switching Frequency Variation(10)
Maximum Duty Cycle
Minimum Duty Cycle
UVLO Threshold Voltage
Feedback Source Current
Internal Soft-Start Time(10)
Condition
VDS = 700V, VGS = 0V
VDS = 560V, VGS = 0V,
TC = 125°C
VGS = 10V, ID = 0.5A
VGS = 0V, VDS = 25V,
f = 1MHz
VDS = 350V, ID = 1.0A
-25°C TA 85°C
Measured at 0.1 x VDS
VFB = GND
VFB = GND
VFB = GND
VFB = 4V
Min. Typ. Max. Unit
50
200
8.8 11
6.0 7.2
4.0 4.75
250
550
315
25
38
47
10
17
9
12
20
11.2
4
15
34
30
55
28.2
10
25
32
μA
W
pF
ns
92 100 108 KHz
±5 ±10 %
55 60 65 %
0 0 0%
11 12 13
789
V
0.7 0.9 1.1 mA
10 ms
© 2006 Fairchild Semiconductor Corporation
FSQ0170RNA, FSQ0270RNA, FSQ0370RNA Rev. 1.0.1
5
www.fairchildsemi.com

5 Page

Q0370RNA arduino
Application Information
Methods of Reducing Audible Noise
Switching-mode power converters have electronic and
magnetic components, which generate audible noise
when the operating frequency is in the range of
20~20,000Hz. Even though they operate above 20KHz,
they can make noise, depending on the load condition.
The following sections discuss methods to reduce noise.
Glue or Varnish
The most common method of reducing noise involves
www.DataSheet4U.cuosming glue or varnish to tighten magnetic components.
The motion of core, bobbin, and coil and the chattering
or magnetostriction of core can cause the transformer to
produce audible noise. The use of rigid glue and varnish
helps reduce the transformer noise. Glue or varnish can
also can crack the core because sudden changes in the
ambient temperature cause the core and the glue to
expand or shrink in a different ratio.
Figure 19. Equal Loudness Curves
Ceramic Capacitor
Using a film capacitor instead of a ceramic capacitor as a
snubber capacitor is another noise reduction solution.
Some dielectric materials show a piezoelectric effect,
depending on the electric field intensity. Hence, a
snubber capacitor becomes one of the most significant
sources of audible noise. Another possibility is to use a
Zener clamp circuit instead of an RCD snubber for
higher efficiency as well as lower audible noise.
Adjusting Sound Frequency
Moving the fundamental frequency of noise out of the
2~4kHz range is the third method. Generally, humans
are more sensitive to noise in the range of 2~4kHz.
When the fundamental frequency of noise is located in
this range, the noise sounds louder although the noise
intensity level is identical (see Figure 19).
When the FPS acts in burst mode and the burst
operation is suspected to be a source of noise, this
method may be helpful. If the frequency of burst mode
operation lies in the range of 2~4kHz, adjusting the
feedback loop can shift the burst operation frequency. To
reduce the burst operation frequency, increase a
feedback gain capacitor (CF), opto-coupler supply
resistor (RD); and feedback capacitor (CB), and decrease
a feedback gain resistor (RF), as shown in Figure 20.
Figure 20. Typical Feedback Network of FPS
Other Reference Materials
AN-4134: Design Guidelines for Off-line Forward
Converters Using Fairchild Power Switch (FPS™)
AN-4137: Design Guidelines for Off-line Flyback
Converters Using Fairchild Power Switch (FPS™)
AN-4140: Transformer Design Consideration for Off-line
Flyback Converters using Fairchild Power Switch (FPS™)
AN-4141: Troubleshooting and Design Tips for Fairchild
Power Switch (FPS™) Flyback Applications
AN-4147: Design Guidelines for RCD Snubber of
Flyback
AN-4148: Audible Noise Reduction Techniques for
FPS™ Applications
© 2006 Fairchild Semiconductor Corporation
FSQ0170RNA, FSQ0270RNA, FSQ0370RNA Rev. 1.0.1
11
www.fairchildsemi.com

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