FSQ0170RNA, FSQ0270RNA, FSQ0370RNA — Green Mode Fairchild Power Switch (FPS™)
April 2007
FSQ0170RNA, FSQ0270RNA, FSQ0370RNA
Green Mode Fairchild Power Switch (FPS™)
Features
Internal Avalanche Rugged 700V SenseFET
Consumes only 0.8W at 230 V
AC
& 0.5W Load with
Burst-Mode Operation
Precision Fixed Operating Frequency, 100kHz
Internal Start-up Circuit and Built-in Soft-Start
Pulse-by-Pulse Current Limiting and Auto-Restart
Mode
Over-Voltage Protection (OVP), Overload Protection
(OLP), Internal Thermal Shutdown Function (TSD)
Under-Voltage Lockout (UVLO)
Low Operating Current (3mA)
Adjustable Peak Current Limit
Description
The FSQ0170RNA, FSQ0270RNA, FSQ0370RNA
consists of an integrated current mode Pulse Width
Modulator (PWM) and an avalanche-rugged 700V Sense
FET. It is specifically designed for high-performance off-
line Switch Mode Power Supplies (SMPS) with minimal
external components. The integrated PWM controller
features include: a fixed-frequency generating 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.
Compared to a discrete MOSFET and controller or RCC
switching converter solution, the FSQ0170RNA,
FSQ0270RNA, FSQ0370RNA reduces total component
count, design size, and weight while increasing
efficiency, productivity, and system reliability. These
devices provide a basic platform that is well suited for the
design of cost-effective flyback converters, as in PC
auxiliary power supplies.
Applications
Auxiliary Power Supply for PC and Server
SMPS for VCR, SVR, STB, DVD & DVCD Player,
Printer, Facsimile & Scanner
Adapter for Camcorder
Related Application Notes
AN-4134: Design Guidelines for Off-line Forward
Converters Using Fairchild Power Switch (FPS™)
AN-4137: Design Guidelines for Off-line Flyback
Converters Using Fairchild Power Switch (FPS™)
AN-4141: Troubleshooting and Design Tips for
Fairchild Power Switch (FPS™) Flyback Applications
AN-4147: Design Guidelines for RCD Snubber of
Flyback
AN-4148: Audible Noise Reduction Techniques for
FPS™ Applications
8-DIP
Ordering Information
Product Number
FSQ0170RNA
FSQ0270RNA
FSQ0370RNA
Package
8DIP
8DIP
8DIP
Marking Code
Q0170R
Q0270R
Q0370R
BV
DSS
700V
700V
700V
f
OSC
100kHz
100kHz
100kHz
R
DS(ON) (MAX.)
11Ω
7.2Ω
4.75Ω
FPS
TM
is a trademark of Fairchild Semiconductor Corporation.
© 2006 Fairchild Semiconductor Corporation
FSQ0170RNA, FSQ0270RNA, FSQ0370RNA Rev. 1.0.2
www.fairchildsemi.com
FSQ0170RNA, FSQ0270RNA, FSQ0370RNA — Green Mode Fairchild Power Switch (FPS™)
Application Diagram
AC
IN
DC
OUT
V
str
I
PK
PWM
FB
Drain
V
CC
GND
FSQ0x70RNA Rev. 1.01
Figure 1. Typical Flyback Application
Output Power Table
(1)
Product
FSQ0170RNA
FSQ0270RNA
FSQ0370RNA
230V
AC
±15%
(2)
Adapter
(3)
14W
17W
20W
85–265V
AC
Adapter
(3)
9W
11W
13W
Open Frame
(4)
20W
24W
27W
Open Frame
(4)
13W
16W
19W
Notes:
1. The maximum output power can be limited by junction temperature.
2. 230 V
AC
or 100/115 V
AC
with doubler.
3. Typical continuous power in a non-ventilated enclosed adapter with sufficient drain pattern as a heat sink, at 50°C
ambient.
4. Maximum practical continuous power in an open-frame design with sufficient drain pattern as a heat sink, at 50°C
ambient.
Internal Block Diagram
V
CC
2
I
CH
V
str
5
Drain
6,7,8
8V/12V
V
BURL
/V
BURH
V
CC
I
DELAY
V
CC
OSC
I
FB
2.5R
V
CC
good
V
ref
Internal
Bias
FB 3
I
PK
4
R
Normal
Burst
PWM
S
R
Q
Q
LEB
Gate
Driver
V
SD
V
CC
V
ovp
TSD
V
CC
good
S
R
Q
Q
Soft-Start
FSQ0x70RNA Rev. 1.00
1
GND
Figure 2. Internal Block Diagram
© 2006 Fairchild Semiconductor Corporation
FSQ0170RNA, FSQ0270RNA, FSQ0370RNA Rev. 1.0.2
2
www.fairchildsemi.com
FSQ0170RNA, FSQ0270RNA, FSQ0370RNA — Green Mode Fairchild Power Switch (FPS™)
Pin Configuration
GND
V
CC
FB
I
PK
FSQ0x70RNA Rev. 1.00
D
D
D
V
str
8-DIP
Figure 3. Pin Configuration (Top View)
Pin Definitions
Pin #
1
Name
GND
Description
Ground.
SenseFET source terminal on primary side and internal control
ground.
Power Supply.
Positive supply voltage input. Although connected to an aux-
iliary transformer winding, current is supplied from pin 5 (V
str
) via an internal
switch during start-up, see Figure 2. It is not until V
CC
reaches the UVLO upper
threshold (12V) that the internal start-up switch opens and device power is
supplied via the auxiliary transformer winding.
Feedback.
The feedback voltage pin is the non-inverting input to the PWM
comparator. It has a 0.9mA current source connected internally while a capac-
itor and opto-coupler are typically connected externally. A feedback voltage of
6V triggers overload protection (OLP). There is a time delay while charging ex-
ternal capacitor C
FB
from 3V to 6V using an internal 5µA current source. This
time delay prevents false triggering under transient conditions, but still allows
the protection mechanism to operate under true overload conditions.
Peak Current Limit.
This pin adjusts the peak current limit of the SenseFET.
The 0.9mA feedback current source is diverted to the parallel combination of
an internal 2.8kΩ resistor and any external resistor to GND on this pin. This
determines the peak current limit. If this pin is tied to V
CC
or left floating, the
typical peak current limit is 0.8A (FSQ0170RNA), 0.9A (FSQ0270RNA), or
1.1A (FSQ0370RNA).
Start-up.
This pin connects to the rectified AC line voltage source. At start-up,
the internal switch supplies internal bias and charges an external storage ca-
pacitor placed between the V
CC
pin and ground. Once the V
CC
reaches 12V,
the internal switch is opened.
SenseFET drain.
High-voltage power SenseFET drain connection.
SenseFET drain.
High-voltage power SenseFET drain connection.
SenseFET drain.
High-voltage power SenseFET drain connection.
2
V
CC
3
FB
4
I
PK
5
6
7
8
V
str
Drain
Drain
Drain
© 2006 Fairchild Semiconductor Corporation
FSQ0170RNA, FSQ0270RNA, FSQ0370RNA Rev. 1.0.2
3
www.fairchildsemi.com
FSQ0170RNA, FSQ0270RNA, FSQ0370RNA — 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
I
DM
Drain Pin Voltage
Vstr Pin Voltage
Characteristic
Value
700
700
FSQ0170RNA
4
8
12
50
140
230
20
-0.3 to V
CC
1.5
Internally limited
-25 to +85
-55 to +150
FSQ0270RNA
FSQ0370RNA
FSQ0170RNA
Unit
V
V
A
Drain Current Pulsed
(5)
E
AS
V
CC
V
FB
P
D
T
J
T
A
T
STG
Single Pulsed Avalanche Energy
(6)
Supply Voltage
Feedback Voltage Range
Total Power Dissipation
Operating Junction Temperature
Operating Ambient Temperature
Storage Temperature
FSQ0270RNA
FSQ0370RNA
mJ
V
V
W
°C
°C
°C
Notes:
5. Non-repetitive rating: Pulse width is limited by maximum junction temperature.
6. L = 51mH, starting T
J
= 25°C.
Thermal Impedance
T
A
= 25°C, unless otherwise specified. All items are tested with the standards JESD 51-2 and 51-10 (DIP).
Symbol
θ
JA
θ
JC
θ
JT
Parameter
Junction-to-Ambient Thermal Resistance
(7)
Junction-to-Case Thermal Resistance
(8)
Junction-to-Top Thermal Resistance
(9)
Value
80
20
35
Unit
°C/W
°C/W
°C/W
Notes:
7. Free standing with no heatsink; without copper clad.
(Measurement Condition - Just before junction temperature T
J
enters into OTP.)
8. Measured on the DRAIN pin close to plastic interface.
9. Measured on the PKG top surface.
© 2006 Fairchild Semiconductor Corporation
FSQ0170RNA, FSQ0270RNA, FSQ0370RNA Rev. 1.0.2
4
www.fairchildsemi.com
FSQ0170RNA, FSQ0270RNA, FSQ0370RNA — Green Mode Fairchild Power Switch (FPS™)
Electrical Characteristics
T
A
= 25°C unless otherwise specified.
Symbol
SenseFET Section
(10)
Parameter
Condition
V
DS
= 700V, V
GS
= 0V
Min.
Typ.
Max.
50
200
Unit
I
DSS
Zero-Gate-Voltage Drain Current
Drain-Source
On-State
Resistance
(11)
FSQ0170RNA
FSQ0270RNA
FSQ0370RNA
FSQ0170RNA
FSQ0270RNA
FSQ0370RNA
FSQ0170RNA
V
DS
= 560V, V
GS
= 0V,
T
C
= 125°C
8.8
V
GS
= 10V, I
D
= 0.5A
6.0
4.0
250
550
315
V
GS
= 0V, V
DS
= 25V,
f = 1MHz
25
38
47
10
17
9
12
20
11.2
4
15
V
DS
= 350V, I
D
= 1.0A
34
30
55
28.2
10
25
32
92
-25°C
≤
T
A
≤
85°C
Measured at 0.1 x V
DS
V
FB
= GND
V
FB
= GND
V
FB
= GND
V
FB
= 4V
55
0
11
7
0.7
100
±5
60
0
12
8
0.9
10
μA
11
7.2
4.75
Ω
R
DS(ON)
C
ISS
Input Capacitance
C
OSS
Output Capacitance
FSQ0270RNA
FSQ0370RNA
FSQ0170RNA
FSQ0270RNA
FSQ0370RNA
FSQ0170RNA
FSQ0270RNA
FSQ0370RNA
FSQ0170RNA
pF
C
RSS
Reverse Transfer
Capacitance
t
d(on)
Turn-On Delay Time
t
r
Rise Time
FSQ0270RNA
FSQ0370RNA
FSQ0170RNA
ns
t
d(off)
Turn-Off Delay Time
FSQ0270RNA
FSQ0370RNA
FSQ0170RNA
t
f
Fall Time
FSQ0270RNA
FSQ0370RNA
Control Section
f
OSC
Δf
OSC
D
MAX
D
MIN
V
START
V
STOP
I
FB
t
S/S
Switching Frequency
Switching Frequency Variation
(10)
Maximum Duty Cycle
Minimum Duty Cycle
UVLO Threshold Voltage
Feedback Source Current
Internal Soft-Start Time
(10)
108
±10
65
0
13
9
1.1
KHz
%
%
%
V
mA
ms
© 2006 Fairchild Semiconductor Corporation
FSQ0170RNA, FSQ0270RNA, FSQ0370RNA Rev. 1.0.2
5
www.fairchildsemi.com
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