FSL126MR — Green Mode Fairchild Power Switch (FPS™)
April 2012
FSL126MR
Green Mode Fairchild Power Switch (FPS™)
Features
Internal Avalanche-Rugged SenseFET (650V)
Under 50mW Standby Power Consumption at
265V
AC
, No-load Condition with Burst Mode
Precision Fixed Operating Frequency with
Frequency Modulation for Attenuating EMI
Internal Startup Circuit
Built-in Soft-Start: 15ms
Pulse-by-Pulse Current Limiting
Various Protections: Over-Voltage Protection
(OVP), Overload Protection (OLP), Output-Short
Protection (OSP), Abnormal Over-Current
Protection (AOCP), Internal Thermal Shutdown
Function with Hysteresis (TSD)
Auto-Restart Mode
Under-Voltage Lockout (UVLO)
Low Operating Current: 1.8mA
Adjustable Peak Current Limit
Description
The FSL126MR integrated Pulse Width Modulator
(PWM) and SenseFET is specifically designed for high-
performance offline Switch-Mode Power Supplies
(SMPS) with minimal external components. FSL126MR
includes integrated high-voltage power switching
regulators
that
combine
an
avalanche-rugged
SenseFET with a current-mode PWM control block.
The integrated PWM controller includes: Under-Voltage
Lockout (UVLO) protection, Leading-Edge Blanking
(LEB), a frequency generator for EMI attenuation, 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. The
FSL126MR offers good soft-start performance. When
compared to a discrete MOSFET and controller or RCC
switching converter solution, the FSL126MR reduces
total component count, 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.
Maximum Output Power
(1)
230V
AC
± 15%
(2)
Adapter
(3)
15W
Notes:
Applications
SMPS for VCR, STB, DVD, & DVCD Players
SMPS for Home Appliance
Adapter
85-265V
AC
Adapter
12W
(3)
Open
Frame
21W
Open
Frame
17W
Related Resources
AN-4137 — Design Guidelines for Off-line Flyback
Converters using FPS™
AN-4141 — Troubleshooting and Design Tips for
Fairchild Power Switch (FPS™) Flyback
Applications
AN-4147 —-Design Guidelines for RCD Snubber of
Flyback
Evaluation Board: FEBFSL126MR_H432v1
Fairchild Power Supply WebDesigner — Flyback
Design & Simulation - In Minutes at No Expense
1.
2.
3.
The junction temperature can limit the maximum
output power.
230V
AC
or 100/115V
AC
with doubler.
Typical continuous power in a non-ventilated
enclosed adapter measured at 50°C ambient.
Ordering Information
Part Number
FSL126MR
Operating
Temperature Range
-40 to 105°C
Top Mark
Package
Packing Method
Rail
www.fairchildsemi.com
FSL126MR 8-Lead, Dual Inline Package (DIP)
© 2010 Fairchild Semiconductor Corporation
FSL126MR • Rev. 1.0.1
FSL126MR — Green Mode Fairchild Power Switch (FPS™)
Typical Application Diagram
Figure 1. Typical Application
Internal Block Diagram
V
CC
2
I
C H
V
B U R L
/V
B U R H
V
CC
I
D EL A Y
V
FB
3
I
PK
4
O n -Tim e
D e te c tor
OSP
S
V
CC
Good
TS D
R
Q
Q
A OC P
V
AO C P
1 GN D
V
CC
I
F B
2 .5 R
R
S oft
S ta rt
LE B
R a ndom
Fre que nc y
G e ne ra tor
OSC
PWM
S
R
Q
Q
G a te
Driv e r
8 V /1 2V
V
CC
Good
Inte rna l
B ia s
V
ST R
5
D ra in
6 ,7 ,8
V
R EF
V
SD
V
CC
V
O VP
Figure 2. Internal Block Diagram
© 2010 Fairchild Semiconductor Corporation
FSL126MR • Rev. 1.0.1
www.fairchildsemi.com
2
FSL126MR — Green Mode Fairchild Power Switch (FPS™)
Pin Configuration
Figure 3. Pin Configuration
Pin Definitions
Pin #
1
2
Name
GND
V
CC
Description
Ground.
SenseFET source terminal on the primary side and internal control ground.
Positive Supply Voltage Input.
Although connected to an auxiliary transformer winding,
current is supplied from pin 5 (V
STR
) via an internal switch during startup (see
Figure 2).
Once
V
CC
reaches the UVLO upper threshold (12V), the internal startup switch opens and device
power is supplied via the auxiliary transformer winding.
Feedback Voltage.
The non-inverting input to the PWM comparator, it has a 0.4mA current
source connected internally, while a capacitor and opto-coupler are typically connected
externally. There is a delay while charging external capacitor C
FB
from 2.4V to 6V using an
internal 5µA current source. This delay prevents false triggering under transient conditions, but
still allows the protection mechanism to operate under true overload conditions.
Peak Current Limit.
Adjusts the peak current limit of the SenseFET. The feedback 0.4mA
current source is diverted to the parallel combination of an internal 6kΩ resistor and any
external resistor to GND on this pin to determine the peak current limit.
Startup.
Connected to the rectified AC line voltage source. At startup, the internal switch
supplies internal bias and charges an external storage capacitor placed between the V
CC
pin
and ground. Once V
CC
reaches 12V, the internal switch is opened.
Drain.
Designed to connect directly to the primary lead of the transformer and capable of
switching a maximum of 650V. Minimizing the length of the trace connecting these pins to the
transformer decreases leakage inductance.
3
V
FB
4
I
PK
5
V
STR
6, 7, 8
Drain
© 2010 Fairchild Semiconductor Corporation
FSL126MR • Rev. 1.0.1
www.fairchildsemi.com
3
FSL126MR — 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. T
J
= 25°C, unless otherwise specified.
Symbol
V
STR
V
DS
V
CC
V
FB
I
D
I
DM
E
AS
P
D
T
J
T
A
T
STG
ESD
Θ
JA
Θ
JC
Θ
JT
V
STR
Pin Voltage
Parameter
Drain Pin Voltage
Supply Voltage
Feedback Voltage Range
Continuous Drain Current
Drain Current Pulsed
(4)
Single Pulsed Avalanche Energy
(5)
Total Power Dissipation
Operating Junction Temperature
Operating Ambient Temperature
Storage Temperature
Human Body Model, JESD22-A114
(6)
Min.
-0.3
-0.3
-0.3
Max.
650.0
650.0
26
12.0
2
8
73
1.5
Unit
V
V
V
V
A
A
mJ
W
°C
°C
°C
KV
Internally Limited
-40
-55
5
2
80
19
33.7
+105
+150
Charged Device Model, JESD22-C101
(6)
Junction-to-Ambient Thermal Resistance
(7,8)
Junction-to-Case Thermal Resistance
(7,9)
Junction-to-Top Thermal Resistance
(7,10)
°C/W
°C/W
°C/W
Notes:
4. Repetitive rating: pulse width limited by maximum junction temperature.
5. L=30mH, starting T
J
=25°C.
6. Meets JEDEC standards JESD 22-A114 and JESD 22-C101.
7. All items are tested with the standards JESD 51-2 and JESD 51-10.
8.
Θ
JA
free-standing, with no heat-sink, under natural convection.
9.
Θ
JC
junction-to-lead thermal characteristics under
Θ
JA
test condition. T
C
is measured on the source #7 pin closed
to plastic interface for
Θ
JA
thermo-couple mounted on soldering.
10.
Θ
JT
junction-to-top of thermal characteristic under
Θ
JA
test condition. T
t
is measured on top of package. Thermo-
couple is mounted in epoxy glue.
© 2010 Fairchild Semiconductor Corporation
FSL126MR • Rev. 1.0.1
www.fairchildsemi.com
4
FSL126MR — Green Mode Fairchild Power Switch (FPS™)
Electrical Characteristics
T
A
= 25°C unless otherwise specified.
Symbol
SenseFET Section
BV
DSS
I
DSS
R
DS(ON)
C
ISS
C
OSS
C
RSS
t
d(ON)
t
r
t
d(OFF)
t
f
f
OSC
∆f
OSC
f
FM
D
MAX
D
MIN
V
START
V
STOP
I
FB
t
S/S
V
BURH
V
BURL
V
BUR(HYS)
Protection Section
I
LIM
t
CLD
V
SD
I
DELAY
V
OVP
t
OSP
V
OSP
t
OSP_FB
V
AOCP
TSD
HYS
TSD
t
LEB
Parameter
Drain-Source Breakdown Voltage
Zero Gate Voltage Drain Current
Drain-Source On-State Resistance
Input Capacitance
Output Capacitance
Reverse Transfer Capacitance
Turn-On Delay
Rise Time
Turn-Off Delay
Fall Time
Switching Frequency
Switching Frequency Variation
Frequency Modulation
Maximum Duty Cycle
Minimum Duty Cycle
UVLO Threshold Voltage
Feedback Source Current
Internal Soft-Start Time
V
FB
= 4V
V
FB
= 0V
Conditions
V
CC
= 0V, I
D
= 250µA
V
DS
= 650V, V
GS
= 0V
V
GS
= 10V, V
GS
= 0V, T
C
= 25°C
V
GS
= 0V, V
DS
= 25V, f = 1MHz
V
GS
= 0V, V
DS
= 25V, f = 1MHz
V
GS
= 0V, V
DS
= 25V, f = 1MHz
V
DD
= 350V, I
D
= 2A
V
DD
= 350V, I
D
= 2A
V
DD
= 350V, I
D
= 2A
V
DD
= 350V, I
D
= 2A
V
DS
= 650V, V
GS
= 0V
V
GS
= 10V, V
GS
= 0V, T
C
= 125°C
Min. Typ. Max. Units
650
250
4.9
210
33.3
4.1
23
16.4
17.2
23
61
67
±5
±3
71
0
11
7
320
10
0.48
77
0
12
8
400
15
0.60
0.45
150
83
0
13
9
480
20
0.72
0.58
73
±10
6.2
V
µA
Ω
pF
pF
pF
ns
ns
ns
ns
KHz
%
KHz
%
%
V
V
µA
ms
V
V
mV
1.68
6.5
6.5
25.5
1.35
A
ns
6.0
5.0
24.0
1.00
1.44
2.0
0.85
125
300
1.60
2.5
1.00
137
60
1.15
150
V
µA
V
µs
V
µs
V
°C
°C
ns
Control Section
After Turn-On
V
FB
= 0V
V
FB
= 4V
Burst Mode Section
Burst Mode Voltage
T
J
= 25°C
0.32
Peak Current Limit
Current Limit Delay Time
(11)
Shutdown Feedback Voltage
Shutdown Delay Current
Over-Voltage Protection Threshold
Threshold Time
Output-Short Threshold Feedback
Protection
(11)
Voltage
Feedback Blanking
Time
AOCP Voltage
(11)
Thermal
Shutdown
(11)
Shutdown Temperature
Hysteresis
(11)
T
J
= 25°C, di/dt = 300mA/µs
V
CC
= 15V
V
FB
= 5V
V
FB
= 2V
T
J
= 25°C
OSP Triggered When t
ON
<t
OSP
,
V
FB
>V
OSP
and Lasts Longer than
t
OSP_FB
T
J
= 25°C
1.32
200
5.5
3.5
22.5
1.50
Leading-Edge Blanking Time
Continued on the following page…
© 2010 Fairchild Semiconductor Corporation
FSL126MR • Rev. 1.0.1
www.fairchildsemi.com
5
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