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DM0465R Schematic ( PDF Datasheet ) - Fairchild Semiconductor

Teilenummer DM0465R
Beschreibung FSDM0465R
Hersteller Fairchild Semiconductor
Logo Fairchild Semiconductor Logo 




Gesamt 20 Seiten
DM0465R Datasheet, Funktion
FSCM0465R
Green Mode Fairchild Power Switch (FPS™)
wJwuwne.D2a0t0a6Sheet4U.com
Features
„ Internal Avalanche Rugged SenseFET
„ Low Start-up Current (max. 40µA)
„ Low Power Consumption; under 1W at 240VAC and
0.4W Load
„ Precise Fixed Operating Frequency (66kHz)
„ Frequency Modulation for Low EMI
„ Pulse-by-Pulse Current Limiting (Adjustable)
„ Over-Voltage Protection (OVP)
„ Overload Protection (OLP)
„ Thermal Shutdown Function (TSD)
„ Auto-Restart Mode
„ Under-Voltage Lock Out (UVLO) with Hysteresis
„ Built-in Soft-Start (15ms)
Applications
„ SMPS for VCR, SVR, STB, DVD, and DVCD
„ Adaptor
„ SMPS for LCD Monitor
Description
The FSCM0465R 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 a discrete MOSFET and PWM controller
solution, it can reduce total cost, component count, size,
and weight while simultaneously increasing efficiency,
productivity, and system reliability. This device is a basic
platform well suited for cost-effective designs of flyback
converters.
Related Application Notes
„ AN-4137: Design Guidelines for Off-line Flyback
Converters Using Fairchild Power Switch (FPS)
„ AN-4140: Transformer Design Consideration for
Off-line Flyback Converters using Fairchild Power
Switch
„ AN-4141: Troubleshooting and Design Tips for
Fairchild Power Switch Flyback Applications
„ AN-4148: Audible Noise Reduction Techniques for
FPS Applications
Ordering Information
Product Number Package Pb-Free Marking Code
FSCM0465RJ
D2-PAK-6L Yes
FSCM0465RJX
D2-PAK-6L
FSCM0465RIWDTU(1) I2-PAK-6L
FSCM0465RGWDTU(1) TO-220-6L
Yes
Yes
Yes
CM0465R
Note:
1. WDTU: Forming Type
FPSTM is a trademark of Fairchild Semiconductor Corporation.
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
1
BVDSS
650V
RDS(ON) Max.
2.6 Ω
Packing
Method
Tube
Tape & Reel
Tube
Tube
www.fairchildsemi.com






DM0465R Datasheet, Funktion
Electrical Characteristics
TA = 25°C unless otherwise specified.
www.DataSheet4U.com
Symbol
Parameter
Condition
Min. Typ. Max. Unit
SenseFET SECTION
IDSS Zero Gate Voltage Current
RDS(ON) Static Drain Source on Resistance(1)
COSS Output Capacitance
td(on) Turn-on Delay Time
tr Rise Time
td(off) Turn-off Delay Time
tf Fall Time
CONTROL SECTION
VDS = Max, Rating VGS = 0V
VGS = 10V, ID = 2.3A
VGS = 0V, VDS = 25V, f = 1MHz
VDD = 325V, ID = 3.2A(4)
-
-
-
-
-
-
-
- 250 µA
2.2 2.6 Ω
60 - pF
23 -
20 -
ns
65 -
27 -
fOSC Switching Frequency
ΔfMOD Switching Frequency Modulation Range
tMOD Switching Frequency Modulation Cycle
fSTABLE Switching Frequency Stability
ΔfOSC Switching Frequency Variation(2)
DMAX Maximum Duty Cycle
DMIN Minimum Duty Cycle
VSTART
VSTOP
UVLO Threshold Voltage
IFB Feedback Source Current
tS/S Internal Soft-Start Time
BURST MODE SECTION
VCC = 14V, VFB = 5V
10V VCC 17V
25°C TA +85°C
VFB = GND
VFB = GND
60 66 72 kHz
- ±3 - kHz
- 4 - ms
0 1 3%
- ±5 ±10 %
75 80 85 %
- - 0%
11 12 13 V
789V
0.7 0.9 1.1 mA
10 15 20 ms
VBURH
VBURL
Burst Mode Voltages
PROTECTION SECTION
ILIMIT Peak Current Limit(3)
VOVP
TSD
Over-Voltage Protection
Thermal Shutdown Temperature(2)
IDELAY Shutdown Delay Current
VSD Shutdown Feedback Voltage
TOTAL DEVICE SECTION
VCC = 14V
VCC = 14V
VCC = 14V, VFB = 5V
VFB = 4V
VFB 5.5V
0.4 0.5 0.6
0.24 0.3 0.36
V
V
2.2 2.5 2.8
18 19 20
130 145 160
3.5 5.3 7
5.5 6 6.5
A
V
°C
µA
V
Istart
IOP(MIN)
IOP(MAX)
Startup Current
Operating Supply Current
VCC = 10V, VFB = 0V
VCC = 20V, VFB = 0V
- 20 40 µA
- 2.5 5 mA
Notes:
1. Pulse Test: Pulse width 300µS, duty 2%
2. These parameters, although guaranteed at the design, are not tested in mass production.
3. These parameters indicate the inductor current. Where packages are I2PAK or D2PAK, this should be decreased to
2.0A by external resistor.
4. MOSFET switching time is essentially independent of operating temperature.
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
6
www.fairchildsemi.com

6 Page









DM0465R pdf, datenblatt
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 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 5.3µA current
source (Idelay) 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 21. The delay time for shutdown is the time
required to charge CB from 2.5V to 6.0V with 5.3µA
(Idelay). A 10 ~ 50ms delay time is typical for most
applications.
VFB
FSCM0465R Rev. 00
Overload Protection
6.0V
3.3 Thermal Shutdown (TSD): The SenseFET and the
control IC are built in one package. This mwawkews.Dit aetaasSyheet4U.com
for the control IC to detect the heat generation from the
SenseFET. When the temperature exceeds
approximately 145°C, the thermal protection is triggered,
resulting in shutdown of the FPS.
4. Frequency Modulation: EMI reduction can be
accomplished by modulating the switching frequency of
a switched power supply. Frequency modulation can
reduce EMI by spreading the energy over a wider
frequency range than the bandwidth measured by the
EMI test equipment. The amount of EMI reduction is
directly related to the depth of the reference frequency.
As can be seen in Figure 22, the frequency changes
from 63KHz to 69KHz in 4ms.
Drain Current
Ts
2.5V
T12= CB*(6.0-2.5)/Idelay
T1 T2 t
Figure 21. Overload Protection
Ts
fs
69kHz
66kHz
63kHz
Ts
3.2 Over-Voltage Protection (OVP): If the secondary-
side feedback circuit were to malfunction or a solder
defect causes an opening in the feedback path, the
current through the opto-coupler transistor becomes
almost zero. In this case, 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 activated. Because more energy
than required is provided to the output, the output
voltage may exceed the rated voltage before the
overload protection is activated, resulting in the
breakdown of the devices in the secondary side. To
prevent this situation, an over- voltage protection (OVP)
circuit is employed. In general, VCC is proportional to the
output voltage and the FSCM0465R 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.
FSCM0465R Rev. 00
4ms
t
Figure 22. Frequency Modulation
5. Soft-Start: The FSCM0465R has an internal soft-start
circuit that increases PWM comparator inverting input
voltage, together with the SenseFET current, slowly after
it starts up. The typical soft-start time is15ms. The pulse
width to the power switching device is progressively
increased to establish the correct working conditions for
transformers, rectifier diodes, and capacitors. The
voltage on the output capacitors is progressively
increased with the intention of smoothly establishing the
required output voltage. Preventing transformer
saturation and reducing stress on the secondary diode
during startup is also helpful.
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
12
www.fairchildsemi.com

12 Page





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