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PDF FSFM261N Datasheet ( Hoja de datos )

Número de pieza FSFM261N
Descripción Green-Mode Fairchild Power Switch
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo
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FSFM261N datasheet

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FSFM261N pdf
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
VSTR Pin Voltage
650 V
VDS1
Drain Pin Voltage of FSFM260N and FSFM300N
650
V
VDS2
Drain Pin Voltage of FSFM261N
700 V
VCC Supply Voltage
VFB Feedback Voltage Range(6)
21
-0.3 8.0
V
V
IDM Drain Current Pulsed
9.6 A
Continuous Drain Current of
FSFM260 and FSFM261(7)
ID Continuous Drain Current of
FSFM300(7)
TC = 25°C
TC = 100°C
TC = 25°C
TC = 100°C
2.2
1.4
A
2.8
1.7
EAS
Single Pulsed Avalanche Energy(8) FSFM260 and FSFM261
FSFM300
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.
www.DataSh8e.et4LU=.1c4ommH, starting TJ=25°C.
Thermal Impedance
TA = 25°C unless otherwise specified.
Symbol
Parameter
θJA Junction-to-Ambient Thermal Resistance(9)
θJC Junction-to-Case Thermal Resistance(10)
ΨJT 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 / FSFM261N / FSFM300N • Rev. 1.0.1
5
www.fairchildsemi.com

5 Page

FSFM261N arduino
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
www.DataSheet4U.com
Vcc
12V
8V
components, 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 FSFM260/261/300 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 FSFM260/261/300 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
2.5V
T12= Cfb*(6.0-2.5)/Idelay
T1 T2 t
Figure 20. Overload Protection
© 2009 Fairchild Semiconductor Corporation
FSFM260N / FSFM261N / FSFM300N • Rev. 1.0.1
11
www.fairchildsemi.com

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