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PDF FSDM311L Data sheet ( Hoja de datos )
| Número de pieza | FSDM311L | |
| Descripción | Green Mode Fairchild Power Switch (FPS) | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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www.fairchildsemi.com
FSDM311
Green Mode Fairchild Power Switch (FPSTM)
Features
• Internal Avalanche Rugged Sense FET
• Precision Fixed Operating Frequency (67kHz)
• Advanced Burst-Mode operation Consumes under 0.2W
at 265Vac and no load
• Internal Start-up Switch and Soft Start
• Under Voltage Lock Out (UVLO) with Hysteresis
• Pulse by Pulse Current Limit
• Over Load Protection (OLP)
• Over Voltage Protection (OVP)
• Internal Thermal Shutdown Function (TSD)
• Secondary Side Regulation
• Auto-Restart Mode
TYPICAL POWER CAPABILITY
PRODUCT
Open Frame
230VAC ±15%(1)
85-265VAC
FSDM311
20W
12W
FSDM311L
20W
12W
Table 1. Notes: 1. 230 VAC or 100/115 VAC with doubler.
Typical Circuit
Applications
• Charger & Adaptor for Mobile Phone, PDA & MP3
• Auxiliary Power for White Goods, PC, C-TV & Monitor
Description
The FSDM311 is an integrated Pulse Width Modulator
(PWM) and Sense FET specially designed for high perfor-
mance off-line Switch Mode Power Supplies (SMPS) with
minimal external components. This device is a monolithic
high voltage power switching regulator which combines an
VDMOS Sense FET with a voltage mode PWM control
block. The integrated PWM controller features include: a
fixed oscillator, Under Voltage Lock Out (UVLO) protec-
tion, Leading Edge Blanking (LEB), optimized gate turn-on/
turn-off driver, thermal shut down protection (TSD), temper-
ature compensated precision current sources for loop com-
pensation and fault protection circuitry. When compared to a
discrete MOSFET and controller or RCC switching con-
verter solution, the FSDM311 reduces total component
count, design size, weight and at the same time increases
efficiency, productivity, and system reliability. This device is
a basic platform well suited for cost effective designs of fly-
back converters.
AC
IN
Vstr Drain
PWM
Vfb Vcc Source
DC
OUT
Figure 1. Typical Flyback Application using FSDM311
©2004 Fairchild Semiconductor Corporation
Rev.1.0.5
1 page  
FSDM311
Electrical Characteristics (Sense FET Part)
(Ta = 25°C unless otherwise specified)
Parameter
Sense FET SECTION
Drain-Source Breakdown Voltage
Zero Gate Voltage Drain Current
Static Drain-Source on Resistance
(Note)
Forward Trans conductance (Note)
Input Capacitance
Output Capacitance
Reverse Transfer Capacitance
Turn on Delay Time
Rise Time
Turn Off Delay Time
Fall Time
Total Gate Charge
(Gate-Source + Gate-Drain)
Gate-Source Charge
Gate-Drain (Miller) Charge
Symbol
Condition
Min. Typ. Max. Unit
BVDSS
IDSS
VGS=0V, ID=50µA
VDS=Max. Rating,
VGS=0V
VDS=0.8Max. Rating,
VGS=0V, TC=125°C
650 720
--
-
25
- - 200
RDS(ON) VGS=10V, ID=0.5A
- 14 19
gfs
CISS
COSS
CRSS
td(on)
tr
td(off)
tf
Qg
Qgs
Qgd
VDS=50V, ID=0.5A
VGS=0V, VDS=25V,
f=1MHz
VDD=0.5B VDSS,
ID=1.0A
(MOSFET switching time
is essentially
independent of
operating temperature)
VGS=10V, ID=1.0A,
VDS=0.5B VDSS
(MOSFET switching time
is essentially
independent of operating
temperature)
1.0
-
-
-
-
-
-
-
-
-
-
1.3
162
18
3.8
9.5
19
33
42
7.0
3.1
0.4
-
-
-
-
-
-
-
-
-
-
-
V
µA
µA
Ω
S
pF
ns
nC
Note:
1. Pulse test: Pulse width ≤ 300µS, duty ≤ 2%
2. S = -1--
R
5
5 Page 
FSDM311
OSC
Vfb
Vfb
4
Cfb
5uA 400uA
+
-
R 3V
OLP
RESET
Vth 4.5V
TSD
SQ
R
GATE
DRIVER
SQ
R
A/R
FSDM311
OLP, TSD
Protection Block
OLP
4.5V
3V
FPS Switching Area
Idelay (5uA) charges Cfb
IC Reset
Figure 7. Protection block
4.1 Over Load Protection (OLP) : Overload is a load cur-
rent that exceeds a pre-set level due to an abnormal situation.
If this occurs, the protection circuit should be triggered to
protect the SMPS. It is possible that a short term load tran-
sient can occur under normal operation. If this occurs the
system should not shut down. In order to avoid false shut-
downs, the over load protection circuit is designed to trigger
after a delay. Therefore the device can discriminate between
transient overloads and true fault conditions. The device is
pulse-by-pulse current limited and therefore, for a given
input voltage, the maximum input power is limited. If the
load tries to draw more than this, the output voltage will drop
below its set value. This reduces the opto-coupler LED cur-
rent which in turn will reduce the photo-transistor current.
Therefore, the 400uA current source will charge the feed-
back pin capacitor, Cfb, and the feedback voltage, Vfb, will
increase. The input to the feedback comparator is clamped at
around 3V. Therefore, once Vfb reaches 3V, the device is
switching at maximum power. At this point the 400uA cur-
rent source is blocked and the 5uA source continues to
charge Cfb. Once Vfb reaches 4.5V, switching stops. There-
fore the shutdown delay time is set by the time required to
charge Cfb from 3V to 4.5V with 5uA as shown in Fig. 5.
t1 t2
t1<<t2, t3
t1 = -1/RCΧ ln( 1-v(t1)/R )
t2 = CΧ [v(t1+t2)-v(t1)]Χ Idelay
t3
v(t1)=3V
t
Figure 8. Over load protection delay
5. Soft Start : The FPS has an internal soft start circuit that
increases the drain current limit together with the MOSFET
current slowly after it starts up. The soft start time is typical
15msec as shown in figure 9. It progressively increases dur-
ing the start-up phase. The pulse width to the power switch-
ing devices is progressively increased to establish the correct
working conditions for transformers, inductors, and capaci-
tors. The voltage on the output capacitors is progressively
increased with the intention of smoothly establishing the
required output voltage. Consequently it prevents the trans-
former’s saturation and the secondary diodes’s stress.
0.55A
Drain current
[A]
2mS
7steps
4.2 Thermal Shutdown (TSD) : The Sense FET and the
control IC are assembled in one package. This makes it easy
for the control IC to detect the temperature of the Sense FET.
When the temperature exceeds approximately 145°C, ther-
mal shutdown is activated.
0.31A
Figure 9. Internal Soft Start
t
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet FSDM311L.PDF ] | |
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