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PDF FSFM260N Datasheet ( Hoja de datos )

Número de pieza FSFM260N
Descripción (FSFM260N / FSFM300N) 30W FPS
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo

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FSFM260N Hoja de datos, Descripción, Manual
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FSFM260N / FSFM300N
Green-Mode Fairchild Power Switch (FPS™)
April 2009
Features
! Internal Avalanche-Rugged SenseFET
! Advanced Burst-Mode Operation Consumes Under
1W at 240VAC and 0.5W Load
! Precision Fixed Operating Frequency: 67kHz
! Internal Startup Circuit
! Over-Voltage Protection (OVP)
! Overload Protection (OLP)
! Internal Thermal Shutdown Function (TSD)
! Abnormal Over-Current Protection (AOCP)
! Auto-Restart Mode
! Under-Voltage Lockout (UVLO) with Hysteresis
! Low Operating Current: 2.5mA
! Built-in Soft-Start: 15ms
Applications
! Power Supply for LCD TV and Monitor, VCR, SVR,
STB, DVD, and DVD Recorder
! Adapter
Description
The FSFM260/300 is an integrated Pulse Width
Modulator (PWM) and SenseFET specifically designed
for high-performance offline Switch Mode Power
Supplies (SMPS) with minimal external components.
This device is an integrated high-voltage power-
switching regulator that combines an avalanche-rugged
SenseFET with a current-mode PWM control block. The
PWM controller includes an integrated fixed-frequency
oscillator, under-voltage lockout, leading-edge blanking
(LEB), optimized gate driver, internal soft-start,
temperature-compensated precise-current sources for a
loop compensation, and self-protection circuitry.
Compared with discrete MOSFET and PWM controller
solutions, it can reduce total cost, component count, size,
and weight while simultaneously increasing efficiency,
productivity, and system reliability. This device is a basic
platform for cost-effective designs of flyback converters.
Related Resources
Visit: http://www.fairchildsemi.com/apnotes/ for:
! AN-4134: Design Guidelines for Offline Forward
Converters Using Fairchild Power Switch (FPS)
! AN-4137: Design Guidelines for Offline Flyback
Converters Using Fairchild Power Switch (FPS)
! AN-4140: Transformer Design Consideration for
Offline Flyback Converters Using Fairchild Power
Switch (FPS)
! AN-4141: Troubleshooting and Design Tips for
Fairchild Power Switch (FPS) Flyback Applications
! AN-4145: Electromagnetic Compatibility for Power
Converters
! AN-4147: Design Guidelines for RCD Snubber of
Flyback Converters
! AN-4148: Audible Noise Reduction Techniques for
Fairchild Power Switch (FPS™) Applications
© 2009 Fairchild Semiconductor Corporation
FSFM260N / FSFM300N Rev. 1.0.0
www.fairchildsemi.com

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FSFM260N pdf
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Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only. TA = 25°C, unless otherwise specified.
Symbol
Parameter
Min.
Max.
Unit
VSTR
VDS
VCC
VFB
IDM
ID
EAS
VSTR Pin Voltage
Drain Pin Voltage
Supply Voltage
Feedback Voltage Range(6)
Drain Current Pulsed
Continuous Drain Current of
FSFM260(7)
Continuous Drain Current of
FSFM300(7)
Single Pulsed Avalanche Energy(8)
TC = 25°C
TC = 100°C
TC = 25°C
TC = 100°C
FSFM260
FSFM300
650 V
650 V
21 V
-0.3 8.0 V
9.6 A
2.2
1.4
A
2.8
1.7
120
mJ
190
PD
TJ
TA
TSTG
ESD
Total Power Dissipation (TC=25°C)
Operating Junction Temperature
Operating Ambient Temperature
Storage Temperature
Electrostatic Discharge Capability Human Body Model,
JESD22-A114
Electrostatic Discharge Capability, Charged Device Model,
JESD22-C110
1.5
Internally Limited
-25 +85
-55 +150
2.0
2.0
W
°C
°C
°C
kV
Notes:
6. VFB is internally clamped and its maximum clamping current capability is 100μA.
7. Repetitive rating: pulse-width limited by maximum junction temperature.
8. L=14mH, starting TJ=25°C.
Thermal Impedance
TA = 25°C unless otherwise specified.
Symbol
θJA
θJC
ΨJT
Parameter
Junction-to-Ambient Thermal Resistance(9)
Junction-to-Case Thermal Resistance(10)
Junction-to-Top Thermal Resistance(11)
Notes:
9. Free standing with no heat-sink under natural convection.
10. Infinite cooling condition - refer to the SEMI G30-88.
11. Measured on the package top surface.
Package
8-DIP
Value
80
20
35
Unit
°C/W
°C/W
°C/W
© 2009 Fairchild Semiconductor Corporation
FSFM260N / FSFM300N Rev. 1.0.0
5
www.fairchildsemi.com

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FSFM260N arduino
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where, Ilim_spec is the limit current stated on the
specification; Na and Np are the number of turns for VCC
and primary side, respectively; Ifb is the internal current
source at feedback pin with a typical value of 0.9mA; and
ΔIlim_comp is the current difference that must be
eliminated. In case of capacitor in the circuit 1µF, 100V is
good choice for all applications.
VDC Np
L
Vfb Drain
Vcc
Na
RLIM
I_lim GND
FSFM260 Rev. 00
RY
compensation
network
CY
-
+
Vy
= VDC
×
Na
Np
Figure 18. Constant Power Limit Circuit
Vds Power
on
Fault
occurs
Fault
removed
Vcc
12V
8V
the reliability is improved without increasing cost. Once
the fault condition occurs, switching is terminated and
the SenseFET remains off. This causes VCC to fall.
When VCC reaches the UVLO stop voltage, 8V, the
protection is reset and the internal high-voltage current
source charges the VCC capacitor via the Vstr pin. When
VCC reaches the UVLO start voltage, 12V, the FSFM260/
300 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 (see Figure 19).
3.1 Overload Protection (OLP): Overload is defined as
the load current exceeding a pre-set level due to an
unexpected event. In this situation, the protection circuit
should be activated to protect the SMPS. However, even
when the SMPS is in the normal operation, the overload
protection circuit can be activated during the load
transition. To avoid this undesired operation, the
overload protection circuit is designed to be activated
after a specified time to determine whether it is a
transient situation or an overload situation. Because of
the pulse-by-pulse current limit capability, the maximum
peak current through the SenseFET is limited and,
therefore the maximum input power is restricted with a
given input voltage. If the output consumes beyond this
maximum power, the output voltage (VO) decreases
below the set voltage. This reduces the current through
the opto-coupler LED, which also reduces the opto-
coupler transistor current, increasing the feedback
voltage (VFB). If VFB exceeds 2.5V, D1 is blocked and
the 5µA current source starts to charge CB slowly up to
VCC. In this condition, VFB continues increasing until it
reaches 6V, when the switching operation is terminated,
as shown in Figure 20. The delay time for shutdown is
the time required to charge CB from 2.5V to 6.0V with
5µA. In general, a 10 ~ 50ms delay time is typical for
most applications.
VFB
FSFM260 Rev: 00
Overload protection
6.0V
t
FSFM260 Rev: 00
Normal
operation
Fault
situation
Normal
operation
Figure 19. Auto Restart Operation
3. Protection Circuit: The FSFM260/300 has several
self protective functions, such as overload protection
(OLP), over-voltage protection (OVP), and thermal
shutdown (TSD). Because these protection circuits are
fully integrated into the IC without external components,
2.5V
T12= Cfb*(6.0-2.5)/Idelay
T1 T2 t
Figure 20. Overload Protection
© 2009 Fairchild Semiconductor Corporation
FSFM260N / FSFM300N Rev. 1.0.0
11
www.fairchildsemi.com

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