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PDF FSDM0465RB Data sheet ( Hoja de datos )
| Número de pieza | FSDM0465RB | |
| Descripción | Green Mode Fairchild Power Switch | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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www.fairchildsemi.com
FSDM0465RB
www.DataSheet4U.com
Green Mode Fairchild Power Switch (FPSTM)
Features
• Internal Avalanche Rugged SenseFET
• Advanced Burst-Mode Operation Consumes Under One
W at 240VAC & 0.5W Load
• Precision Fixed Operating Frequency (66kHz)
• Internal Start-up Circuit
• Improved Pulse by Pulse Current Limiting
• Over Voltage Protection (OVP) : Auto-Restart
• Over Load Protection (OLP): Auto-Restart
• Internal Thermal Shutdown (TSD) : Auto-Restart
• Under Voltage Lock Out (UVLO) with Hysteresis
• Low Operating Current (2.5mA)
• Built-in Soft Start
Application
• SMPS for LCD monitor and STB
• Adapter
Related Application Notes
• AN4137 - Design Guidelines for Off-line Flyback
Converters Using Fairchild Power Switch (FPS)
• AN4140 - Transformer Design Consideration for Off-line
Flyback Converters Using Fairchild Power Switch
• AN4141 - Troubleshooting and Design Tips for Fairchild
Power Switch Flyback Applications
• AN4148 - Audible Noise Reduction Techniques for FPS
Applications
Description
The FSDM0465RB 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 which
combines a rugged avalanche, SenseFET with a current mode
PWM control block. The PWM controller includes 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 a
discrete MOSFET and PWM controller solution, the PWM/
FSDMRB can reduce total cost, component count, size and
weigh, while simultaneously increasing efficiency, productivity,
and system reliability. This device provides a basic platform
well suited for cost-effective designs of flyback converters.
OUTPUT POWER TABLE (4)
230VAC ±15%(3)
85-265VAC
PRODUCT
Adapt- Open Adapt- Open
er(1) Frame(2) er(1) Frame(2)
FSDM0465RB 48W
56W
40W
48W
FSDM0565RB 60W
70W
50W
60W
FSDM07652RB 70W
80W
60W
70W
FSDM12652RB 90W
110W
80W
90W
Table 1. Maximum Output Power
Notes:
1. Typical continuous power in a non-ventilated enclosed
adapter measured at 50°C ambient.
2. Maximum practical continuous power in an open frame
design at 50°C ambient.
3. 230 VAC or 100/115 VAC with doubler.
4. The junction temperature can limit the maximum output
power.
Typical Circuit
AC
IN
Vstr Drain
PWM
Vfb Vcc Source
DC
OUT
Figure 1. Typical Flyback Application
FPSTM is a trademark of Fairchild Semiconductor Corporation
©2005 Fairchild Semiconductor Corporation
Rev.1.0.0
1 page  
Electrical Characteristics
(Ta = 25°C unless otherwise specified)
Parameter
SenseFET SECTION
Drain Source Breakdown Voltage
Zero Gate Voltage Drain Current
Static Drain Source On Resistance (1)
Output Capacitance
Turn On Delay Time
Rise Time
Turn Off Delay Time
Fall Time
CONTROL SECTION
Initial Frequency
Voltage Stability
Temperature Stability (2)
Maximum Duty Cycle
Minimum Duty Cycle
Start Threshold Voltage
Stop Threshold Voltage
Feedback Source Current
Soft-start Time
Leading Edge Blanking Time
BURST MODE SECTION
Burst Mode Voltages
FSDM0465RB
Symbol
Condition
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Min. Typ. Max. Unit
BVDSS VGS = 0V, ID = 250µA 650 -
-V
IDSS
VDS = 650V, VGS = 0V
VDS= 520V
VGS = 0V, TC = 125°C
-
-
- 250 µA
- 250 µA
RDS(ON) VGS = 10V, ID = 2.5A
- 2.2 2.6 Ω
COSS
VGS = 0V, VDS = 25V,
f = 1MHz
- 60
- pF
TD(ON)
TR
TD(OFF)
TF
VDD= 325V, ID= 3.2A
- 23 -
- 20 -
ns
- 65 -
- 27 -
FOSC
FSTABLE
∆FOSC
DMAX
DMIN
VSTART
VSTOP
IFB
TS
TLEB
VFB = 3V
13V ≤ Vcc ≤ 18V
-25°C ≤ Ta ≤ 85°C
-
-
VFB=GND
VFB=GND
VFB=GND
Vfb=3
-
60 66 72 kHz
0 1 3%
0 ±5 ±10 %
77 82 87 %
- - 0%
11 12 13 V
78 9V
0.7 0.9 1.1 mA
- 10 15 ms
- 250 -
ns
VBURH
VBURL
Vcc=14V
Vcc=14V
- 0.7 -
- 0.5 -
V
V
5
5 Page 
FSDM0465RB
Vds Power
Oonn
Fault
Ooccccuurrss
Fault
rRememovoevded
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VFB
Over LlooaaddpPrrootteeccttiioonn
6.0V
Vcc
12V
8V
t
Normal
Ooppeerration
Fault
sSitiutuaatitoionn
Normal
Ooppeerraattiioonn
Figure 6. Auto Restart Operation
3.1 Over Load 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 operation normally, the
over load protection circuit can be activated during the load
transition. To avoid this undesired operation, the over load
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,
thus increasing the feedback voltage (Vfb).
If Vfb exceeds 2.5V, D1 is blocked and the 3.5uA 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 7. The delay time for shutdown is the time required to
charge CB from 2.5V to 6.0V with 3.5uA.
In general, a 10 ~ 50 ms delay time is typical for most
applications.
2.5V
T12= Cfb*(6.0-2.5)/Idelay
T1
Figure 7. Over Load Protection
T2 t
3.2 Over Voltage Protection (OVP): If the secondary side
feedback circuit malfunction or a solder defect caused an
open in the feedback path, the current through the opto-
coupler transistor becomes almost zero. Then, Vfb climbs up
in a similar manner to the over load situation, forcing the
preset maximum current to be supplied to the SMPS until the
over load protection is activated. Because more energy than
required is provided to the output, the output voltage may
exceed the rated voltage before the over load protection is
activated, resulting in the breakdown of the devices in the
secondary side. To prevent this situation, an OVP circuit is
employed. In general, Vcc is proportional to the output
voltage and the FSDM0465RB uses Vcc instead of directly
monitoring the output voltage. If VCC exceeds 19V, an OVP
circuit is activated resulting in the termination of the
switching operation. To avoid undesired activation of OVP
during normal operation, Vcc should be designed to be
below 19V.
3.3 Thermal Shutdown (TSD): The SenseFET and the
control IC are built in one package. This makes it easy for
the control IC to detect the heat generation from the Sense
FET. When the temperature exceeds approximately 150°C,
the thermal shutdown is activated.
4. Soft Start: The FSDM0465RB’s internal soft-start circuit
slowly increases the PWM comparator’s inverting input
voltage along with the SenseFET current after it starts up.
The typical soft-start time is 10msec, The pulse width to the
power switching device is progressively increased to
establish the correct working conditions for transformers,
inductors, and capacitors. The voltage on the output
capacitors is progressively increased with the intention of
smoothly establishing the required output voltage. It also
helps to prevent transformer saturation and reduce the stress
on the secondary diode during startup.
11
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| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet FSDM0465RB.PDF ] | |
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