DataSheet.es FSFM260N Hoja de datos PDF


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 datasheet

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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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Functional Description
1. Startup: In previous generations of Fairchild Power
Switches (FPS™), the VCC pin had an external startup
resistor to the DC input voltage line. In this generation,
the startup resistor is replaced by an internal high-
voltage current source. At startup, an internal high-
voltage current source supplies the internal bias and
charges the external capacitor (Cvcc) connected to the
VCC pin, as illustrated in Figure 16. When VCC reaches
12V, the FSFM260/300 begins switching and the internal
high-voltage current source is disabled. Then, the
FSFM260/300 continues its normal switching operation
and the power is supplied from the auxiliary transformer
winding unless VCC goes below the stop voltage of 8V.
VDC
CVcc
VCC
2
Vstr
5
8V/12V
VCC good
Istart
Vref
Internal
Bias
FSFM260 Rev: 00
Figure 16. Internal Startup Circuit
2. Feedback Control: FSFM260/300 employs current-
mode control, as shown in Figure 17. 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 RSENSE resistor makes it possible to
control the switching duty cycle. When the reference pin
voltage of the shunt regulator exceeds the internal
reference voltage of 2.5V, the optocoupler LED current
increases, pulling down the feedback voltage and
reducing the duty cycle. This typically occurs when the
input voltage is increased or the output load is
decreased.
2.1 Pulse-by-Pulse Current Limit: Because current-
mode control is employed, the peak current through the
SenseFET is determined by the inverting input of the
PWM comparator (VFB*), as shown in Figure 17. When
the current through the opto-transistor is zero and the
current limit pin (#4) is left floating, the feedback current
source (IFB) of 0.9mA flows only through the internal
resistor (R+2.5R=2.8k). In this case, the cathode voltage
of diode D2 and the peak drain current have maximum
values of 2.5V and 1.5A, respectively. The pulse-by-
pulse current limit can be adjusted using a resistor to
GND on the current limit pin (#4). The current limit level
using an external resistor (RLIM) is given by:
ILIM=
RLIMILIM_SPEC
2.8kΩ+RLIM
(1)
=>
RLIM
=
ILIM 2.8kΩ
ILIM_SPEC ILIM
(2)
where, ILIM is the desired drain current limit.
VCC VCC
Idelay
IFB
VO Vfb
3 OSC
FOD817A
D1 D2
CB 2.5R
KA431
+
Vfb* R
-
SenseFET
Gate
driver
FSFM260 Rev: 00
VSD
OLP
Rsense
Figure 17. Pulse Width Modulation (PWM) Circuit
2.2 Leading-Edge Blanking (LEB): At the instant the
internal SenseFET is turned on, a high-current spike
occurs through the SenseFET, caused by primary-side
capacitance and secondary-side rectifier reverse
recovery. Excessive voltage across the RSENSE resistor
would lead to incorrect feedback operation in the current-
mode PWM control. To counter this effect, the FSFM260/
300 employs a leading edge blanking (LEB) circuit. This
circuit inhibits the PWM comparator for a short time
(tLEB) after the SenseFET is turned on.
2.3 Constant Power Limit Circuit: Due to the circuit
delay of FPS, the pulse-by-pulse limit current increases
a little bit when the input voltage increases. This means
unwanted excessive power is delivered to the secondary
side. To compensate, the auxiliary power compensation
network in Figure 18 can be used. RLIM can adjust pulse-
by-pulse current by absorbing internal current source
(IFB: typical value is 0.9mA) depending on the ratio
between resistors. With the suggested compensation
circuit, additional current from IFB is absorbed more
proportionally to the input voltage (VDC) and achieves
constant power in wide input range. Choose RLIM for
proper current to the application, then check the pulse-
by-pulse current difference between minimum and
maximum input voltage. To eliminate the difference (to
gain constant power), Ry can be calculated by:
Ry
Ilim_spec
×Vdc
×
Na
Np
Ifb × ΔIlim_comp
(3)
© 2009 Fairchild Semiconductor Corporation
FSFM260N / FSFM300N Rev. 1.0.0
10
www.fairchildsemi.com

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