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Q0270RA Datasheet PDF Download - Fairchild Semiconductor

Номер произв Q0270RA
Описание Q0170RA
Производители Fairchild Semiconductor
логотип Fairchild Semiconductor логотип 
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Q0270RA Даташит, Описание, Даташиты
FSQ0170RNA, FSQ0270RNA
Green Mode Fairchild Power Switch (FPS™)
October 2011
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
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
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, and FSQ0270RNA, 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, and
FSQ0270RNA 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
Package
8DIP
8DIP
Marking Code
Q0170RA
Q0270RA
BVDSS
700V
700V
fOSC
100kHz
100kHz
RDS(ON) (MAX.)
11
7.2
FPSTM is a trademark of Fairchild Semiconductor Corporation.
© 2006 Fairchild Semiconductor Corporation
FSQ0170RNA, FSQ0270RNA Rev. 1.0.5
www.fairchildsemi.com
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Q0270RA Даташит, Описание, Даташиты
Application Diagram
AC
IN
Vstr Drain
IPK PWM
FB VCC GND
DC
OUT
FSQ0x70RNA Rev. 1.01
Figure 1. Typical Flyback Application
Output Power Table(1)
Product
230VAC 15%(2)
Adapter(3)
Open Frame(4)
85–265VAC
Adapter(3)
Open Frame(4)
FSQ0170RNA
14W
20W
9W
13W
FSQ0270RNA
17W
24W
11W
16W
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 50C
ambient.
4. Maximum practical continuous power in an open-frame design with sufficient drain pattern as a heat sink, at 50C
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 Rev. 1.0.5
2
www.fairchildsemi.com
--------------------------------------------

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Q0270RA Даташит, Описание, Даташиты
Pin Configuration
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 2.8kresistor 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).
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 Rev. 1.0.5
3
www.fairchildsemi.com
--------------------------------------------





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