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Q0370RNA (Fairchild) : Total 17 Pages

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FSQ0170RNA, FSQ0270RNA, FSQ0370RNA
Green Mode Fairchild Power Switch (FPS™)
December 2006
Features
„ Internal Avalanche Rugged 700V SenseFET
„ Consumes only 0.8W at 230 VAC & 0.5W Load with
Burst-Mode Operation
„ Precision Fixed Operating Frequency, 100kHz
www.DataSheet4U.c„omInternal 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
Applications
„ Auxiliary Power Supply for PC and Server
„ SMPS for VCR, SVR, STB, DVD & DVCD Player,
Printer, Facsimile & Scanner
„ Adapter for Camcorder
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.
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
BVDSS
700V
700V
700V
fOSC
100kHz
100kHz
100kHz
RDS(ON) (MAX.)
11Ω
7.2Ω
4.75Ω
FPSTM is a trademark of Fairchild Semiconductor Corporation.
© 2006 Fairchild Semiconductor Corporation
FSQ0170RNA, FSQ0270RNA, FSQ0370RNA Rev. 1.0.1
www.fairchildsemi.com



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Application Diagram
AC
IN
Vstr Drain
IPK PWM
FB VCC GND
DC
OUT
www.DataSheet4U.com
FSQ0x70RNA Rev. 1.01
Figure 1. Typical Flyback Application
Output Power Table(1)
Product
FSQ0170RNA
FSQ0270RNA
FSQ0370RNA
230VAC ±15%(2)
Adapter(3)
Open Frame(4)
14W
20W
17W
24W
20W
27W
85–265VAC
Adapter(3)
Open Frame(4)
9W 13W
11W
16W
13W
19W
Notes:
1. The maximum output power can be limited by junction temperature.
2. 230 VAC or 100/115 VAC 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
VCC
2
FB 3
IPK 4
VBURL/VBURH
VCC
VCC
IDELAY
IFB
8V/12V
Normal
2.5R
R
Burst
Vstr
5
ICH
VCC good
Vref
Internal
Bias
OSC
PWM
SQ
RQ
Gate
Driver
LEB
Drain
6,7,8
VSD
VCC
Vovp
TSD
VCC good
SQ
RQ
Figure 2. Internal Block Diagram
1 GND
Soft-Start
FSQ0x70RNA Rev. 1.00
© 2006 Fairchild Semiconductor Corporation
FSQ0170RNA, FSQ0270RNA, FSQ0370RNA Rev. 1.0.1
2
www.fairchildsemi.com



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Pin Configuration
www.DataSheet4U.com
GND
VCC
FB
IPK
8-DIP
D
D
D
Vstr
FSQ0x70RNA Rev. 1.00
Figure 3. Pin Configuration (Top View)
Pin Definitions
Pin #
Name
1 GND
2 VCC
3 FB
4 IPK
5 Vstr
6 Drain
7 Drain
8 Drain
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 (Vstr) via an internal
switch during start-up, see Figure 2. It is not until VCC 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 CFB 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 VCC 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 VCC pin and ground. Once the VCC 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.
© 2006 Fairchild Semiconductor Corporation
FSQ0170RNA, FSQ0270RNA, FSQ0370RNA Rev. 1.0.1
3
www.fairchildsemi.com



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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. TA = 25°C, unless otherwise specified.
Symbol
Characteristic
Value
Unit
VDRAIN
VSTR
IDM
Drain Pin Voltage
Vstr Pin Voltage
Drain Current Pulsed(5)
FSQ0170RNA
FSQ0270RNA
FSQ0370RNA
700
700
4
8
12
V
V
A
A
A
www.DataSheet4U.com
EAS
Single Pulsed Avalanche Energy(6)
FSQ0170RNA
FSQ0270RNA
FSQ0370RNA
50
140
230
mJ
mJ
mJ
VCC
VFB
PD
TJ
TA
TSTG
Supply Voltage
Feedback Voltage Range
Total Power Dissipation
Operating Junction Temperature
Operating Ambient Temperature
Storage Temperature
20
-0.3 to VCC
1.5
Internally limited
-25 to +85
-55 to +150
V
V
W
°C
°C
°C
Thermal Impedance
TA = 25°C, unless otherwise specified. All items are tested with the standards JESD 51-2 and 51-10 (DIP).
Symbol
θJA
θJC
ψJT
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:
5. Non-repetitive rating: Pulse width is limited by maximum junction temperature.
6. L = 51mH, starting TJ = 25°C.
7. Free standing with no heatsink; without copper clad.
(Measurement Condition - Just before junction temperature TJ 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. 1.0.1
4
www.fairchildsemi.com






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