FSDM311 Green Mode Fairchild Power Switch (FPS™)
July 2006
FSDM311
Green Mode Fairchild Power Switch (FPS™)
Features
Internal Avalanche Rugged SenseFET
Precision Fixed Operating Frequency (67KHz)
Advanced Burst-Mode Operation (power consumption
< 0.1W at 265VAC, no-load condition)
Internal Start-up Circuit
Pulse-by-Pulse Current Limit
Over-Voltage Protection (OVP)
Over-Load Protection (OLP)
Internal Thermal Shutdown Function (TSD)
Auto-Restart Mode
Under-Voltage Lockout (UVLO) with Hysteresis
Built-in Soft-Start
Description
The FSDM311, consisting of integrated Pulse-Width
Modulator (PWM) and SenseFET, is specifically
designed for high-performance, off-line Switch Mode
Power Supplies (SMPS) with minimal external
components. This device is an integrated high-voltage,
power-switching regulator which combines a VDMOS
SenseFET with a voltage mode PWM control block. The
integrated PWM controller features include: a fixed
oscillator, Under-Voltage Lockout (UVLO) protection,
Leading Edge Blanking (LEB), an optimized gate turn-
on/turn-off driver, Thermal Shutdown (TSD) protection,
and
temperature-compensated,
precision-current
sources for loop-compensation and fault-protection
circuitry. When compared to a discrete MOSFET and
controller or RCC switching converter solution, the
FSDM311 device reduces total component count and
design size and weight; while increasing efficiency,
productivity, and system reliability. This device provides
a basic platform that is well suited for the design of cost-
effective flyback converters.
Applications
Charger & Adapter for Mobile Phone, PDA & MP3
Auxiliary Power for White Goods, PC, C-TV & Monitor
Related Application Notes
AN-4137, AN-4141, AN-4147 (Flyback)
AN-4134 (Forward)
AN-4138 (Charger)
Ordering Information
Product Number
FSDM311
FSDM311L
Package
8DIP
8LSOP
Marking Code
DM311
DM311
BV
DSS
650V
650V
f
OSC
67KHz
67KHz
R
DS (ON)
14Ω
14Ω
FPS™ is a trademark of Fairchild Semiconductor Corporation.
© 2003 Fairchild Semiconductor Corporation
FSDM311 Rev. 1.1.0 • 7/14/06
www.fairchildsemi.com
FSDM311 Green Mode Fairchild Power Switch (FPS
™
)
Typical Application & Output Power Table
OUTPUT POWER TABLE
Product
FSDM311
FSDM311L
Open Frame
(1)
230VAC±15%
(2)
13W
13W
85~265VAC
8W
8W
Figure 1 Typical Flyback Application
Notes:
1. Maximum practical continuous power in open-frame
design with sufficient drain pattern as a heat sink,
at 50°C ambient.
2. 230VAC or 100/115VAC with doubler.
Internal Block Diagram
Figure 2 Functional Block Diagram of FSDM311
© 2003 Fairchild Semiconductor Corporation
FSDM311 Rev. 1.1.0 • 7/14/06
2
www.fairchildsemi.com
FSDM311 Green Mode Fairchild Power Switch (FPS
™
)
Pin Assignments
Figure 3 Pin Configuration (Top View)
Pin Definitions
Pin Number
1
Pin Name
GND
Pin Function Description
Ground.
SenseFET source terminal on primary side and internal control
ground.
Positive supply voltage input.
Although connected to an auxiliary
transformer winding, current is supplied from pin 5 (Vstr) via an internal switch
during start-up (see Internal Block Diagram section). When V
CC
reaches the
UVLO upper threshold (9V), the internal start-up switch opens and device
power is supplied by the auxiliary transformer winding.
Feedback.
Inverting input to the PWM comparator with its normal input level
between 0.5V and 2.5V. It has a 0.4mA current source connected internally,
while a capacitor and opto-coupler are typically connected externally. A
feedback voltage of 4.5V triggers overload protection (OLP). There is a time
delay while charging the external capacitor Cfb from 3V to 4.5V using an
internal 5μA current source. This time delay prevents false triggering under
transient conditions, but allows the protection mechanism to operate under true
overload conditions.
No Connection.
Start-up.
This pin connects directly to the rectified AC line voltage source. At
start-up, the internal switch supplies internal bias and charges an external
storage capacitor placed between the V
CC
pin and ground. Once the V
CC
reaches 9V, the internal switch stops charging the capacitor.
SenseFET Drain.
The drain pins are designed to connect directly to the
primary lead of the transformer and are capable of switching a maximum of
650V. Minimizing the length of the trace connecting these pins to the
transformer is recommended to decrease leakage inductance.
2
V
CC
3
Vfb
4
5
NC
Vstr
6,7,8
Drain
© 2003 Fairchild Semiconductor Corporation
FSDM311 Rev. 1.1.0 • 7/14/06
3
www.fairchildsemi.com
FSDM311 Green Mode Fairchild Power Switch (FPS
™
)
Absolute Maximum Ratings
The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The
device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables
are not guaranteed at the absolute maximum ratings.
T
A
=25°C, unless otherwise specified.
Symbol
V
DRAIN
V
STR
V
DG
V
GS
I
DM
I
D
I
D
E
AS
V
CC
V
FB
P
D
T
J
T
A
T
STG
Parameter
Drain Pin Voltage
Vstr Pin Voltage
Drain-Gate Voltage
Gate-Source Voltage
Drain Current Pulsed
(3)
Continuous Drain Current (Tc=25°C)
Continuous Drain Current (Tc=100°C)
Single Pulsed Avalanche Energy
(4)
Supply Voltage
Feedback Voltage Range
Total Power Dissipation
Operating Junction Temperature
Operating Ambient Temperature
Storage Temperature
Value
650
650
650
±20
1.5
0.5
0.32
10
20
-0.3 to V
STOP
1.40
Internally limited
-25 to +85
-55 to +150
Unit
V
V
V
V
A
A
A
mJ
V
V
W
°C
°C
°C
Notes:
3. Repetitive rating: Pulse width is limited by maximum junction temperature.
4. L = 24mH, starting TJ = 25°C.
Thermal Impedance
FSDM311 8DIP. T
A
=25°C, unless otherwise specified.
Symbol
θ
JA
θ
JC
Parameter
Junction-to-Ambient Thermal Impedance
(5)
Junction-to-Case Thermal Impedance
(6)
Value
88.84
13.94
Unit
°C/W
°C/W
Notes:
5. Free standing with no heat sink, without copper clad. (Measurement Condition – Just before junction temperature
T
J
enters into OTP.)
6. Measured on the DRAIN pin close to plastic interface.
All items are tested with the standards JESD 51-2 and 51-10 (DIP).
© 2003 Fairchild Semiconductor Corporation
FSDM311 Rev. 1.1.0 • 7/14/06
4
www.fairchildsemi.com
FSDM311 Green Mode Fairchild Power Switch (FPS
™
)
Electrical Characteristics
T
A
=25°C, unless otherwise specified.
Symbol
SenseFET SECTION
I
DSS
Parameter
Conditions
V
DS
=650V, V
GS
=0V
V
DS
=520V, V
GS
=0V,
T
C
=125°C
V
GS
=10V, I
D
=0.5A
V
DS
=50V, I
D
=0.5A
V
GS
=0V, V
DS
=25V,
f=1MHz
Min.
-
-
-
1.0
-
-
-
-
-
-
-
-
-
-
61
-
60
8
6
0.35
10
4.2
-
0.6
0.45
-
0.475
125
4.0
20
4
-
450
Typ.
-
-
14
1.3
162
18
3.8
9.5
19
33
42
7.0
3.1
0.4
67
±5
67
9
7
0.40
15
4.5
0.3
0.7
0.55
150
0.55
145
4.5
-
5
1.5
550
Max.
25
200
19
-
-
-
-
-
-
-
-
-
-
-
73
±10
74
10
8
0.45
20
4.8
0.6
0.8
0.65
-
0.625
-
5.0
-
6
3.0
650
Unit
Zero-Gate-Voltage Drain Current
μA
Ω
S
pF
R
DS(ON)
Drain-Source On-State Resistance
(7)
g
fs
Forward Trans-Conductance
C
ISS
Input Capacitance
C
OSS
Output Capacitance
C
RSS
Reverse Transfer Capacitance
t
d(on)
Turn-On Delay Time
t
r
Rise Time
t
d(off)
Turn-Off Delay Time
t
f
Fall Time
Q
g
Total Gate Charge
Q
gs
Gate-Source Charge
Q
gd
Gate-Drain (Miller) Charge
CONTROL SECTION
f
OSC
Switching Frequency
Δf
OSC
Switching Frequency Variation
(8)
D
MAX
Maximum Duty Cycle
V
START
UVLO Threshold Voltage
V
STOP
I
FB
Feedback Source Current
t
S/S
Internal Soft-Start Time
V
REF
Reference Voltage
(9)
Reference Voltage Variation with
ΔV
REF
/ΔT
Temperature
(8)(9)
BURST-MODE SECTION
V
BURH
Burst-Mode Voltage
V
BURL
V
BUR(HYS)
PROTECTION SECTION
I
LIM
Peak Current Limit
T
SD
Thermal Shutdown Temperature
(9)
V
SD
Shutdown Feedback Voltage
V
OVP
Over-Voltage Protection
I
DELAY
Shutdown Delay Current
TOTAL DEVICE SECTION
I
OP
Operating Supply Current
(control part only)
I
CH
Start-Up Charging Current
V
DS
=325V, I
D
=1.0A
ns
V
GS
=10V, I
D
=1.0A,
V
DS
=325V
nC
-25°C
≤
T
A
≤
85°C
V
FB
=GND
V
FB
=GND
0V
≤
V
FB
≤
3V
KHz
%
%
V
V
mA
ms
V
mV/°C
V
V
mV
A
°C
V
V
μA
mA
μA
-25°C
≤
T
A
≤
85°C
T
J
=25°C
Hysteresis
3V
≤
V
FB
≤
V
SD
V
CC
≤
16V
V
CC
=0V , V
STR
=50V
Notes:
7. Pulse test: Pulse width
≤
300μs, duty
≤
2%.
8. These parameters, although guaranteed, are tested in EDS (wafer test) process.
9. These parameters, although guaranteed, are not 100% tested in production.
© 2003 Fairchild Semiconductor Corporation
FSDM311 Rev. 1.1.0 • 7/14/06
5
www.fairchildsemi.com
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