FSL176MRT — Green-Mode Fairchild Power Switch (FPS™)
August 2012
FSL176MRT
Green-Mode Fairchild Power Switch (FPS™)
Features
Advanced Soft Burst-Mode Operation for
Low Standby Power and Low Audible Noise
Description
The FSL176MRT 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 FSL176MRT can reduce total
cost, component count, size, and weight; while
simultaneously increasing efficiency, productivity, and
system reliability. This device provides a basic platform
for cost-effective design of a flyback converter.
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, Output-Short
Protection (OSP), and Under-Voltage Lockout (UVLO)
with Hysteresis
Low Operating Current (0.4mA) in Burst Mode
Internal Startup Circuit
Internal High-Voltage SenseFET: 650V
Built-in Soft-Start: 15ms
Auto-Restart Mode
Applications
Power Supply for LCD Monitor, STB, and
DVD Combination
Ordering Information
Output Power Table
Part Number
Package
Operating
Current R
DS(ON)
Junction
Limit (Max.)
Temperature
230V
AC
±15%
(3)
Adapter
(4)
(2)
85~265V
AC
Open
Open
(4)
(5)
Adapter
(5)
Frame
Frame
90W
48W
70W
Replaces
Device
TO-220
6-Lead
(1)
FSL176MRTUDTU
U-
Forming
-40°C ~
+125°C
3.50A
1.6Ω
80W
FSGM0765R
Notes:
1. Pb-free package per JEDEC J-STD-020B.
2. The junction temperature can limit the maximum output power.
3. 230V
AC
or 100/115V
AC
with voltage doubler.
4. Typical continuous power in a non-ventilated enclosed adapter measured at 50C ambient temperature.
5. Maximum practical continuous power in an open-frame design at 50C ambient temperature.
© 2012 Fairchild Semiconductor Corporation
FSL176MRT • Rev. 1.0.0
www.fairchildsemi.com
FSL176MRT — Green-Mode Fairchild Power Switch (FPS™)
Application Circuit
V
O
AC
IN
V
STR
Drain
GND
FB
V
CC
Figure 1.
Typical Application Circuit
Internal Block Diagram
V
STR
6
V
CC
3
Drain
1
V
BURST
0.30V / 0.45V
I
CH
Soft Burst
Random
V
ref
V
CC
Good
7.5V / 12V
V
CC
2.0µA
I
DELAY
FB
4
V
ref
90µA
I
FB
Soft-Start
OSC
S
R
3R
R
Q
Q
Gate
Driver
PWM
N.C.
5
t
ON
<t
OSP
(1.0μs)
LEB (300ns)
LPF
V
OSP
TSD
V
CC
Good
S
R
Q
Q
V
AOCP
2
GND
V
SD
7.0V
V
CC
V
OVP
24.5V
Figure 2.
Internal Block Diagram
© 2012 Fairchild Semiconductor Corporation
FSL176MRT • Rev. 1.0.0
www.fairchildsemi.com
2
FSL176MRT — Green-Mode Fairchild Power Switch (FPS™)
Pin Configuration
Figure 3.
Pin Configuration (Top View)
Pin Definitions
Pin #
1
2
3
Name
Drain
GND
V
CC
Description
SenseFET Drain.
High-voltage power SenseFET drain connection.
Ground.
This pin is the control ground and the SenseFET source.
Power Supply.
This pin is the positive supply input, which provides the internal operating
current for both startup and steady-state operation.
Feedback.
This pin is internally connected to the inverting input of the PWM comparator.
The collector of an opto-coupler is typically tied to this pin. For stable operation, a capacitor
should be placed between this pin and GND. If the voltage of this pin reaches 7V, the overload
protection triggers, which shuts down the FPS.
No Connection
Startup.
This pin is connected directly, or through a resistor, to the high-voltage DC link.
At startup, the internal high-voltage current source supplies internal bias and charges the
external capacitor connected to the V
CC
pin. Once V
CC
reaches 12V, the internal current
source (I
CH
) is disabled.
4
5
6
FB
NC
V
STR
© 2012 Fairchild Semiconductor Corporation
FSL176MRT • Rev. 1.0.0
www.fairchildsemi.com
3
FSL176MRT — Green-Mode Fairchild Power Switch (FPS™)
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol
V
STR
V
DS
V
CC
V
FB
I
DM
I
DS
E
AS
P
D
T
J
T
STG
ESD
V
STR
Pin Voltage
Drain Pin Voltage
V
CC
Pin Voltage
Feedback Pin Voltage
Drain Current Pulsed
Parameter
Min.
Max.
650
650
26
Unit
V
V
V
V
A
A
A
mJ
W
C
C
C
kV
-0.3
T
C
=25C
T
C
=100C
12.0
12.8
6.4
4.0
390
50
150
Continuous Switching Drain Current
(6)
Single Pulsed Avalanche Energy
Maximum Junction Temperature
Operating Junction Temperature
(9)
Storage Temperature
Electrostatic
Discharge Capability
(7)
Total Power Dissipation (T
C
=25C)
(8)
-40
-55
Human Body Model, JESD22-A114
Charged Device Model, JESD22-C101
+125
+150
4.5
2.0
Notes:
6. Repetitive peak switching current when the inductive load is assumed: Limited by maximum duty (D
MAX
=0.74)
and junction temperature
(see Figure 4. ).
7. L=45mH, starting T
J
=25C.
8. Infinite cooling condition
(refer to the SEMI G30-88).
9. Although this parameter guarantees IC operation, it does not guarantee all electrical characteristics.
Figure 4.
Repetitive Peak Switching Current
Thermal Impedance
T
A
=25°C unless otherwise specified.
Symbol
θ
JA
θ
JC
Parameter
Junction-to-Ambient Thermal Impedance
(10)
Junction-to-Case Thermal Impedance
(11)
Value
63.5
2.5
Unit
°C/W
°C/W
Notes:
10. Free standing without heat sink under natural convection condition, per JEDEC 51-2 and 1-10.
11. Infinite cooling condition per Mil Std. 883C method 1012.1.
© 2012 Fairchild Semiconductor Corporation
FSL176MRT • Rev. 1.0.0
www.fairchildsemi.com
4
FSL176MRT — Green-Mode Fairchild Power Switch (FPS™)
Electrical Characteristics
T
J
= 25C unless otherwise specified.
Symbol
SenseFET Section
BV
DSS
I
DSS
R
DS(ON)
C
ISS
C
OSS
t
r
t
f
t
d(on)
t
d(off)
f
S
f
S
D
MAX
D
MIN
I
FB
V
START
V
STOP
t
S/S
V
BURH
V
BURL
V
Hys
Protection Section
I
LIM
V
SD
I
DELAY
t
LEB
V
OVP
t
OSP
V
OSP
t
OSP_FB
TSD
T
Hys
Parameter
Drain-Source Breakdown Voltage
Zero-Gate-Voltage Drain Current
Drain-Source On-State Resistance
Input Capacitance
(12)
Output Capacitance
(12)
Rise Time
Fall Time
Turn-On Delay
Turn-Off Delay
Switching Frequency
(12)
Switching Frequency Variation
(12)
Maximum Duty Ratio
Minimum Duty Ratio
Feedback Source Current
UVLO Threshold Voltage
Internal Soft-Start Time
Conditions
V
CC
= 0V, I
D
= 250A
V
DS
= 520V, T
A
= 125C
V
GS
=10V, I
D
=1A
V
DS
= 25V, V
GS
= 0V, f=1MHz
V
DS
= 25V, V
GS
= 0V, f=1MHz
V
DS
= 325V, I
D
= 4A, R
G
=25Ω
V
DS
= 325V, I
D
= 4A, R
G
=25Ω
V
DS
= 325V, I
D
= 4A, R
G
=25Ω
V
DS
= 325V, I
D
= 4A, R
G
=25Ω
V
CC
= 14V, V
FB
= 4V
-25C
< T
J
< 125C
V
CC
= 14V, V
FB
= 4V
V
CC
= 14V, V
FB
= 0V
V
FB
=0V
V
FB
= 0V, V
CC
Sweep
After Turn-On, V
FB
= 0V
V
STR
= 40V, V
CC
Sweep
Min.
650
Typ.
Max.
Unit
V
250
1.3
674
93
30
26
16
39
61
61
65
11
7.0
67
±5
67
90
12
7.5
15
0.39
0.45
0.30
150
0.51
0.34
73
±10
73
115
13
8.0
1.6
A
Ω
pF
pF
ns
ns
ns
ns
kHz
%
%
%
A
V
V
ms
V
V
mV
Control Section
Burst-Mode Section
Burst-Mode Voltage
V
CC
= 14V, V
FB
Sweep
0.26
Peak Drain Current Limit
Shutdown Feedback Voltage
Shutdown Delay Current
Leading-Edge Blanking Time
Over-Voltage Protection
Output-Short
Protection
(12)
Threshold Time
Threshold V
FB
V
FB
Blanking Time
(12)(14)
di/dt = 300mA/s
V
CC
= 14V, V
FB
Sweep
V
CC
= 14V, V
FB
= 4V
V
CC
Sweep
OSP Triggered when
t
ON
<t
OSP
& V
FB
>V
OSP
(Lasts Longer than t
OSP_FB
)
Shutdown Temperature
Hysteresis
3.15
6.45
1.2
23.0
0.7
1.8
2.0
130
3.50
7.00
2.0
300
24.5
1.0
2.0
2.5
140
60
3.85
7.55
2.8
26.0
1.3
2.2
3.0
150
A
V
A
ns
V
s
V
s
C
C
Thermal Shutdown Temperature
(12)
Continued on the following page…
© 2012 Fairchild Semiconductor Corporation
FSL176MRT • Rev. 1.0.0
www.fairchildsemi.com
5
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