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Fairchild Semiconductor
Fairchild Semiconductor

CQ1265RT Datasheet

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February 2006
FSCQ-Series
FSCQ0565RT/FSCQ0765RT/FSCQ0965RT/FSCQ1265RT/
FSCQ1465RT/FSCQ1565RT/FSCQ1565RP
Green Mode Fairchild Power Switch (FPS™)
Features
Optimized for Quasi-Resonant Converter (QRC)
www.DataSheet4U.comAdvanced Burst-Mode Operation for under 1W
Standby Power Consumption
Pulse-by-Pulse Current Limit
Over Load Protection (OLP) – Auto Restart
Over Voltage Protection (OVP) – Auto Restart
Abnormal Over Current Protection (AOCP) – Latch
Internal Thermal Shutdown (TSD) – Latch
Under Voltage Lock Out (UVLO) with Hysteresis
Low Startup Current (typical: 25µA)
Internal High Voltage SenseFET
Built-in Soft Start (20ms)
Extended Quasi-Resonant Switching
Applications
CTV
Audio Amplifier
Related Application Notes
AN4146: Design Guidelines for Quasi-Resonant
Converters Using FSCQ-Series Fairchild Power
Switch.
AN4140: Transformer Design Consideration for
Off-Line Flyback Converters Using Fairchild Power
Switch.
Description
A Quasi-Resonant Converter (QRC) typically shows
lower EMI and higher power conversion efficiency com-
pared to conventional hard-switched converter with a
fixed switching frequency. Therefore, a QRC is well
suited for noise-sensitive applications, such as color TV
and audio. Each product in the FSCQ-Series contains an
integrated Pulse Width Modulation (PWM) controller and
a SenseFET, and is specifically designed for quasi-
resonant off-line Switch Mode Power Supplies (SMPS)
with minimal external components. The PWM controller
includes an integrated fixed frequency oscillator, under volt-
age lockout, leading edge blanking (LEB), optimized gate
driver, internal soft start, temperature-compensated pre-
cise current sources for a loop compensation, and self
protection circuitry. Compared with a discrete MOSFET
and PWM controller solution, the FSCQ-Series can
reduce total cost, component count, size, and weight, while
simultaneously increasing efficiency, productivity, and sys-
tem reliability. These devices provide a basic platform that
is well suited for cost-effective designs of quasi-resonant
switching flyback converters.
Ordering Information
Product Number
FSCQ0565RTYDTU
FSCQ0765RTYDTU
FSCQ0965RTYDTU
FSCQ1265RTYDTU
FSCQ1465RTYDTU
FSCQ1565RTYDTU
FSCQ1565RPVDTU
Package
TO-220F-5L (Forming)
TO-220F-5L (Forming)
TO-220F-5L (Forming)
TO-220F-5L (Forming)
TO-220F-5L( Forming)
TO-220F-5L (Forming)
TO-3PF-7L (Forming)
Marking Code
CQ0565RT
CQ0765RT
CQ0965RT
CQ1265RT
CQ1465RT
CQ1565RT
CQ1565RP
YDTU: Forming Type
VDTU: Forming Type
BVdss
650V
650V
650V
650V
650V
650V
650V
Rds(ON) Max.
2.2
1.6
1.2
0.9
0.8
0.7
0.7
©2006 Fairchild Semiconductor Corporation
FSCQ-Series Rev. 1.1.2
1
www.fairchildsemi.com
Page 1

Typical Circuit
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AC
IN
Sync
FSCQ-Series
PWM
VFB VCC
Drain
GND
VO
Figure 1. Typical Flyback Application
Table 1. Maximum Output Power
Product
Output Power Table3
230 VAC ±15%2
Open Frame1
FSCQ0565RT
FSCQ0765RT
FSCQ0965RT
FSCQ1265RT
FSCQ1465RT
FSCQ1565RT
FSCQ1565RP
70W
100W
130W
170W
190W
210W
250W
Notes:
1. Maximum practical continuous power in an open frame design at 50°C ambient.
2. 230 VAC or 100/115 VAC with doubler.
3. The junction temperature can limit the maximum output power.
85–265 VAC
Open Frame1
60W
85W
110W
140W
160W
170W
210W
FSCQ-Series Rev. 1.1.2
2
www.fairchildsemi.com
Page 2

Internal Block Diagram
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VFB 4
Soft Start
Sync
5
+
Threshold -
Quasi-Resonant
(QR) Switching
Controller
4.6V/2.6V: Normal QR
3.0V/1.8V: Extended QR
Vcc
3
+
fs
- 9V/15V
VCC good
Drain
1
VBurst
Burst Mode
Controller
Normal Operation
Burst Switching
Vref Vref
Vref
I BFB
VCC
I FB
IB
Idelay
2.5R
R
VSD
Sync
OSC
PWM
SQ
RQ
LEB
600ns
SQ
Vovp
VCC good
(VCC = 9V)
RQ
Auxiliary
Vref
Normal
Operation
QS
QR
Main Bias
Internal
Bias
Gate
Driver
AOCP
TSD
Vocp
Power Off Reset (VCC = 6V)
2 GND
Figure 2. Functional Block Diagram of FSCQ-Series
FSCQ-Series Rev. 1.1.2
3
www.fairchildsemi.com
Page 3
Part Number CQ1265RT
Manufactur Fairchild Semiconductor
Description Search -----> FSCQ1265RT
Total Page 45 Pages
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