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PDF FSL138MRT Data sheet ( Hoja de datos )
| Número de pieza | FSL138MRT | |
| Descripción | Green-Mode Fairchild Power Switch | |
| Fabricantes | Fairchild Semiconductor | |
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May 2012
FSL138MRT
Green-Mode Fairchild Power Switch (FPS™) for
High Input Voltage
Features
Internal Avalanched-Rugged 800V SenseFET
Advanced Soft Burst-Mode Operation for
Low Standby Power and Low Audible Noise
Under 40mW Standby Power Consumption
at 265VAC and No-load Condition
Random Frequency Fluctuation for Low EMI
Pulse-by-Pulse Current Limit
Various Protection Functions: Overload Protection
(OLP), Over-Voltage Protection (OVP), Abnormal
Over-Current Protection (AOCP), Internal Thermal
Shutdown (TSD) with Hysteresis and Under-Voltage
Lockout (UVLO) with Hysteresis
Low Operating Current (0.4mA) in Burst Mode
Internal Startup Circuit
Built-in Soft-Start: 15ms
Auto-Restart Mode
Applications
Power Supply for STB Home Appliances and
Industrial for High AC Input
Description
The FSL138MRT is an integrated Pulse Width
Modulation (PWM) controller and SenseFET specifically
designed for offline Switched-Mode Power Supplies
(SMPS) with minimal external components. The PWM
controller includes an integrated fixed-frequency
oscillator, Under-Voltage Lockout (UVLO), Leading-
Edge Blanking (LEB), optimized gate driver, internal
soft-start, temperature-compensated precise current
sources for loop compensation, and self-protection
circuitry. Compared with a discrete MOSFET and PWM
controller solution, the FSL138MRT can reduce total
cost, component count, size, and weight; while
simultaneously increasing efficiency, productivity, and
system reliability. This device provides a basic platform
suited for cost-effective design of a flyback converter.
Ordering Information
Part Number
FSL138MRT
Package
Output Power Table(2)
Operating
Junction
Temperature
Current
Limit
RDS(ON)
(Max.)
230VAC ± 15%(3)
Adapter(4)
Open
Frame(5)
85~265VAC
Adapter(4)
Open
Frame(5)
Replaces
Device
TO-220F
6-Lead
W-Forming(1)
-40°C ~
+125°C
2.15A 5Ω
35W
50W
24W
35W
KA5M0380RY
DTU
Notes:
1. Pb-free package per JEDEC J-STD-020B.
2. The junction temperature can limit the maximum output power.
3. 230VAC or 100/115VAC with voltage doubler.
4. Typical continuous power in a non-ventilated enclosed adapter measured at 50°C ambient temperature.
5. Maximum practical continuous power in an open-frame design at 50°C ambient temperature.
© 2012 Fairchild Semiconductor Corporation
FSL138MRT • Rev. 1.0.0
www.fairchildsemi.com
1 page  
Electrical Characteristics
TJ=25°C unless otherwise specified.
Symbol
Parameter
Conditions
SenseFET Section
BVDSS
IDSS
RDS(ON)
CISS
COSS
CRSS
tr
tf
td(on)
td(off)
Drain-Source Breakdown Voltage
Zero-Gate-Voltage Drain Current
Drain-Source On-State Resistance
Input Capacitance(12)
Output Capacitance(12)
Reverse Transfer Capacitance(12)
Rise Time
Fall Time
Turn-On Delay
Turn-Off Delay
Control Section
fS Switching Frequency(12)
ΔfS Switching Frequency Variation(12)
DMAX Maximum Duty Ratio
DMIN Minimum Duty Ratio
IFB Feedback Source Current
VSTART
VSTOP
UVLO Threshold Voltage
tS/S Internal Soft-Start Time
Burst-Mode Section
VBURH
VBURL
Hys
Burst-Mode Voltage
Protection Section
ILIM
VSD
IDELAY
tLEB
VOVP
TSD
Hys
Peak Drain Current Limit
Shutdown Feedback Voltage
Shutdown Delay Current
Leading-Edge Blanking Time(12)(13)
Over-Voltage Protection
Thermal Shutdown Temperature(12)
VCC=0V, ID=250μA
VDS=640V, TA=125°C
VGS=10V, ID=1A
VDS=25V, VGS=0V, f=1MHz
VDS=25V, VGS=0V, f=1MHz
VDS=25V, VGS=0V, f=1MHz
VDS=400V, ID=3A, RG=25Ω
VDS=400V, ID=3A, RG=25Ω
VDS=400V, ID=3A, RG=25Ω
VDS=400V, ID=3A, RG=25Ω
VCC=14V, VFB=4V
-25°C < TJ < 125°C
VCC=14V, VFB=4V
VCC=14V, VFB=0V
VFB=0
VFB=0V, VCC Sweep
After Turn-on, VFB=0V
VCC Sweep
VCC=14V, VFB Sweep
di/dt=300mA/μs
VCC=14V, VFB Sweep
VCC=14V, VFB=4V
VCC Sweep
Shutdown Temperature
Hysteresis
Min. Typ. Max. Unit
800
250
4.0 5.0
418
50.5
5.1
29.2
24.6
15.4
23.7
V
μA
Ω
pF
pF
pF
ns
ns
ns
ns
61 67 73 kHz
±5 ±10
%
61 67 73
%
0%
65 90 115 μA
11 12 13
V
7.0 7.5 8.0
V
15 ms
0.39 0.45 0.51
0.26 0.30 0.34
150
V
V
mV
1.89 2.15 2.41
6.45 7.0 7.55
1.2 2.0 2.8
350
23.0 24.5 26.0
130 140 150
60
A
V
μA
ns
V
°C
°C
Continued on the following page…
© 2012 Fairchild Semiconductor Corporation
FSL138MRT • Rev. 1.0.0
5
www.fairchildsemi.com
5 Page 
4.4 Over-Voltage Protection (OVP): If the
secondary-side feedback circuit malfunctions or a
solder defect causes an opening in the feedback path,
the current through the opto-coupler transistor
becomes almost zero. Then VFB climbs up in a similar
manner to the overload situation, forcing the preset
maximum current to be supplied to the SMPS until the
overload protection is triggered. Because more energy
than required is provided to the output, the output
voltage may exceed the rated voltage before the
overload protection is triggered, resulting in the
breakdown of the devices in the secondary side. To
prevent this situation, an OVP circuit is employed. In
general, the VCC is proportional to the output voltage
and the FS136MRT uses VCC instead of directly
monitoring the output voltage. If VCC exceeds 24.5V,
an OVP circuit is triggered, resulting in the termination
of the switching operation. To avoid undesired
activation of OVP during normal operation, VCC should
be designed to be below 24.5V.
4.5 Thermal Shutdown (TSD): The SenseFET and
the control IC on a die in one package makes it easier
for the control IC to detect the over temperature of the
SenseFET. If the temperature exceeds 140°C, the
thermal shutdown is triggered and stops operation.
The FSL138MRT operates in Auto-Restart Mode until
the temperature decreases to around 80°C, when
normal operation resumes.
5. Soft Burst-Mode Operation: To minimize power
dissipation in Standby Mode, the FSL138MRT enters
Burst-Mode operation. As the load decreases, the
feedback voltage decreases. The device automatically
enters Burst Mode when the feedback voltage drops
below VBURL (300mV), as shown in Figure 22. At this
point, switching stops and the output voltages start to
drop at a rate dependent on standby current load. This
causes the feedback voltage to rise. Once it passes
VBURH (450mV), switching resumes. The feedback
voltage then falls and the process repeats. Burst Mode
alternately enables and disables switching of the
SenseFET, reducing switching loss in Standby Mode.
6. Random Frequency Fluctuation (RFF): Fluctuating
switching frequency of an SMPS can reduce EMI by
spreading the energy over a wide frequency range. The
amount of EMI reduction is directly related to the
switching frequency variation, which is limited internally.
The switching frequency is determined randomly by
external feedback voltage and an internal free-running
oscillator at every switching instant. This random
frequency fluctuation scatters the EMI noise around
typical switching frequency (67kHz) effectively and can
reduce the cost of the input filter included to meet the
EMI requirements (e.g. EN55022).
Figure 23. Random Frequency Fluctuation
Figure 22. Burst-Mode Operation
© 2012 Fairchild Semiconductor Corporation
FSL138MRT • Rev. 1.0.0
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet FSL138MRT.PDF ] | |
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