Eta-1d Chassis (Pf29ga18a)
Eta-1d Chassis (Pf29ga18a)
Eta-1d Chassis (Pf29ga18a)
SERVICE MANUAL
MODEL NO. PF29GA18A
TABLE OF CONTENTS
ADJUSTMENTS ..............................................................................................................4
SET-UP ADJUSTMENTS ......................................................................................................4
CIRCUIT ADJUSTMENTS.....................................................................................................7
SERVICE DATA..........................................................................................................15
TECHNICAL DATA OF KEY ICS .....................................................................................15
SERVICE DATA OF KEY ICS..........................................................................................38
APPENDIX
CIRCUIT DIAGRAM
SERVICE MANUAL
SAFETY PRECAUTION
WARNING: REFER SERVICING TO QUALIFIED SERVICE PERSONNEL ONLY.
1. The TV has a nominal working EHT voltage. Extreme caution should be exercised when working
on the TV with the back removed.
1.1 Do not attempt to service this TV if you are not conversant with the precautions and procedures for
working on high voltage equipment.
1.2 When handling or working on the CRT, always discharge the anode to the TV chassis before
removing the anode cap in case of electric shock.
1.3 The CRT, if broken, will violently expel glass fragments. Use shatterproof goggles and take
extreme care while handling.
1.4 Do not hold the CRT by the neck as this is a very dangerous practice.
2. It is essential that to maintain the safety of the customer all power cord forms be replaced exactly
as supplied from factory.
3. Voltage exists between the hot and cold ground when the TV is in operation. Install a suitable
isolating transformer of beyond rated overall power when servicing or connecting any test
equipment for the sake of safety.
SERVICE MANUAL
4. When replacing ICs, use specific tools or a static-proof electric iron with small power (below 35W).
5. Do not use a magnetized screwdriver when tightening or loosing the deflection yoke assembly to
avoid electronic gun magnetized and decrement in convergence of the CRT.
6. When remounting the TV chassis, ensure that all guard devices, such as nonmetal control buttons,
switch, insulating sleeve, shielding cover, isolating resistors and capacitors, are installed on the
original place.
7. Replace blown fuses within the TV with the fuse specified in the parts list.
8. When replacing wires or components to terminals or tags, wind the leads around the terminal
before soldering. When replacing safety components identified by the international hazard symbols
on the circuit diagram and parts list, it must be the company-approved type and must be mounted
as the original.
9. Keep wires away from high temperature components.
SERVICE MANUAL
FDA
This symbol tells you that the critical components identified by the FDA marking have
special safety-related characteristics.
UL
This symbol tells you that the critical components identified by the UL marking have
special safety-related characteristics.
C UL
This symbol tells you that the critical components identified by the C-UL marking
have been evaluated to the UL and C-UL standards and have special safety-related
characteristics.
VDE
This symbol tells you that the critical components identified by the VDE marking have
special safety-related characteristics.
MAINTENANCE
1. Place the TV set on a stable stand or base that is of adequate size and strength to prevent it from
being accidentally tipped over, pushed off, or pulled off. Do not place the set near or over a
radiator or heat register, or where it is exposed to direct sunlight.
2. Do not install the TV set in a place exposed to rain, water, excessive dust, mechanical vibrations or
impacts.
3. Allow enough space (at least 10cm) between the TV and wall or enclosures for proper ventilation.
4. Slots and openings in the cabinet should never be blocked by clothes or other objects.
5. Please power off the TV set and disconnect it from the wall immediately if any abnormal condition
are met, such as bad smell, belching smoke, sparkling, abnormal sound, no picture/sound/raster.
Hold the plug firmly when disconnecting the power cord.
6. Unplug the TV set from the wall outlet before cleaning or polishing it. Use a dry soft cloth for
cleaning the exterior of the TV set or CRT screen. Do not use liquid cleaners or aerosol cleaners.
SERVICE MANUAL
ADJUSTMENTS
SET-UP ADJUSTMENTS
The following adjustments should be made when a complete realignment is required or a new picture
tube is installed.
Perform the adjustments in the following order:
1. Color purity
2. Convergence
3. White balance
Notes:
The purity/convergence magnet assembly and rubber wedges need mechanical positioning.
For some picture tubes, purity/ convergence adjustments are not required.
SERVICE MANUAL
Yok
Fig. 1
2. Convergence Adjustment
Preparation:
Before attempting any convergence adjustment, the TV should be operated for at least 15 minutes.
2.1 Center convergence adjustment
2.1.1 Receive dot pattern.
2.1.2 Adjust the brightness/contrast controls to obtain a sharp picture.
2.1.3 Adjust two tabs of the 4-pole magnet to change the angle between them and red and blue
vertical lines are superimposed each other on the center of the screen.
2.1.4 Turn both tabs at the same time keeping the angle constant to superimpose red and blue
horizontal on the center of the screen.
2.1.5 Adjust two tabs of the 6-pole magnet to superimpose red/blue line and green line.
2.1.6 Remember red and blue movement. Repeat steps 2.1.32.1.5 until optimal convergence is
obtained.
2.2 Circumference convergence adjustment
2.2.1
Loosen the clamp screw holding the deflection yoke assembly and allow it tilting.
2.2.2
Temporarily put the first wedge between the picture tube and deflection yoke assembly. Move
front of the deflection yoke up or down to obtain better convergence in circumference. Push the
mounted wedge in to fix the yoke temporarily.
2.2.3
2.2.4
Move front of the deflection yoke to the left or right to obtain better convergence in
circumference.
2.2.5
Fix the deflection yoke position and put the third wedge in either upper space. Fasten the
SERVICE MANUAL
deflection yoke assembly on the picture tube.
2.2.6
Detach the temporarily mounted wedge and put it in either upper space. Fasten the deflection
yoke assembly on the picture tube.
2.2.7
After fastening the three wedges, recheck overall convergence and ensure to get optimal
convergence. Tighten the lamp screw holding the deflection yoke assembly.
Fig. 2
4-pole Magnet Movement
SERVICE MANUAL
CIRCUIT ADJUSTMENTS
Preparation:
Circuit adjustments should be made only after completion of set-up adjustments.
Circuit adjustments can be performed using the adjustable components inside the TV set. For TVs with
2
Test Point
Voltage (V)
Test Point
Voltage (V)
TP-130V (C821)
135V1.5V
TP-18V (C824)
16V1V
TP-17V (C822)
15V1V
TP-5V-2 (C827)
5V0.3V
TP-5V-1 (C828)
5V0.3V
TP-8V (C826)
8V0.5V
TP-11V (C823)
10.5VV
TP-26V (C461)
30V3V
TP-200V (C463)
195V5V
Note:
Its impossible to check the power part separately from the main chassis board as the part is
mounted on the main chassis board. The power components, etc. should be checked for
burnout when power-on. If burned out, do not power on the TV again until the cause is found
out.
Voltage (V)
Negative of VD461
293V
Negative of VD485
1955V
CRT anode
29.51.5KV
Heater
6.30.3Vrms
4. Focus Adjustment
Caution: Dangerously high voltages are present inside the TV. Extreme caution should be
exercised when working on the TV with the back removed.
4.1 After removing the back cover, look for the FBT on the main PCB. There should be a FCB on
the FBT.
4.2 Power on the TV and preheat it for 15 min.
4.3 Receive a normal TV signal. Rotate knob of the FCB until you get a sharp picture.
Before Adjusting
After Adjusting
Fig. 4
5. Safety Inspection
5.1 Inspection for insulation and voltage-resistant
Perform safety test for all naked metal of the TV. Supply high voltage of 3000V AC, 50Hz (limit
current of 10mA) between all naked metal and cold ground. Test every point for 3 sec. and
ensure no arcing and sparking.
5.2 Requirements for insulation resistance
Measure resistance between naked metal of the TV and feed end of the power cord to be
infinity with a DC-500 high resistance meter and insulation resistance between the naked metal and
SERVICE MANUAL
degaussing coil to be over 20M.
6.
SERVICE mode
PAGE1
PAGE2
Symbol
OSD
OPT
RCUT
GCUT
BCUT
GDRV
BDRV
SCNT
CNTN
CNTC
CNTX
CNTD
BRTN
BRTC
BRTX
BRTS
COLC
COLP
PAGE3
PAGE4
COLD
COLN
COLX
TNTN
TNTC
TNTX
ST3
ST4
SV3
SV4
SVD
ASSH
Description
OSD Horizontal Position
Optional Setting
R CUT OFF
G CUT OFF
B CUT OFF
G DRIVE
B DRIVE
SUB CONTRAST
CONTRAST MIN
CONTRAST CENTER
CONTRAST MAX
CONTRAST MAX IN DVD
BRIGHT MIN.(difference from center)
BRIGHT CENTER
BRIGHT MAX.(difference from center)
SUB BRIGHT
COLOR CENTER NTSC
COLOR CENTER PAL(difference from
COLC)
COLOR CENTER DVD
COLOR MIN.
COLOR MAX.(difference from center)
TINT MIN.(difference from center)
TINT CENTER
TINT MAX.(difference from center)
SHARP CENTER 3.58NTSC TV
SHARP CENTER OTHER TV
SHARP CENTER 3.58NTSC VIDEO
SHARP CENTER OTHER VIDEO
SHARP CENTER DVD
ASYMMETRY-SHARPNESS
Data
63
B7
OPT
OPT
OPT
OPT
OPT
08
0A
3B
66
F7
35
35
15
OPT
33
05
05
0D
5D
28
40
28
15
15
15
15
15
05
(continued)
SERVICE MANUAL
SHPN
SHPX
ABCL
DCBS
CLTB
CLTD
PAGE5
CLTM
CLVO
CLVD
OSDA
HPOS
HPS
PAGE6
PAGE7
PAGE8
VP50
VP60
HIT
HITS
VLIN
VLIS
VSC
VSS
HBOW
HPARA
UBLACK
VBLACK
AGC
HAFC
NOIS
NDTC
MUTT
STAT
VL1
VL25
VL50
VLX
VA1
PAGE9
PAGE10
VA12
VA25
VA50
VAX
SVM
VBLK
VCEN
VB1
VB25
VB50
VBX
FLG0
FLG1
UCOM
RF AGC
AFC GAIN
Noise detection count test
Y-MUTE FOR SOFT START
CONTRAST UP FOR SOFT START
ALC off volume control level
No use
No use
No use
volume level when ALC on(IC
VER1.2_old)
No use
No use
No use
No use
MON/SVM CO MAX SVM DL SVM GAIN
V BLK start V BLK stop
V CENTERING
volume level when ALC on(IC
VER1.2_new)
No use
No use
No use
FLAGS for IF
FLAGS
Miciom control
10
0A
0A
0F
15
60
88
AC
AD
88
01
OPT
OPT
OPT
OPT
OPT
OPT
OPT
OPT
OPT
OPT
OPT
OPT
08
08
30
86
0F
1F
00
00
09
30
40
5A
10
25
3D
57
7F
10
00
13
09
30
4A
60
44
02
00
(continued)
SERVICE MANUAL
PAGE11
PAGE12
PAGE13
PAGE14
PAGE15
PAGE16
PAGE17
OSDF
TB_COL
BB_COL
CL_COL1
CL_COL2
PYNX
PYNN
PYXS
PYNS
RCUTS
GCUTS
BCUTS
GDRVS
BDRVS
AUSTP
BBCT
STBG
STI
STDK
STM
SSBG
SSI
SSDK
SSM
SYNC
SYBBN
SYBBF
SYSR
VCD0
VCD1
BL25
BL49
MODE0
MODE1
OV50
OV60
HOTEL
FM RADIO
SOUND M
SCR SAV
ENGLISH
FRENCH
GERMAN
RUSSIAN
INDONESIAN
MALAY
ARABIC
FARSI
INITIAL
LOCK MENU
CALENDAR
SEC-COL
DEMOKEY
SVIDEO
DVDVIDEO
LOGO
S TRAP B/G
S TRAP I
S TRAP D/K
S TRAP M
S TRAP HP/LP B/G
S TRAP HP/LP I
S TRAP HP/LP D/K
S TRAP HP/LP M
BB judgement
BB judgement
Set WIN Pulse and HLOCK Pulse
Balance 25
Balance 49
11
7F
88
88
01
56
15
11
22
12
00
00
00
00
00
04
06
06
08
08
05
08
08
08
10
00
44
40
4C
00
00
1E
50
29
0F
00
00
00
01
01
01
01
01
01
01
01
01
01
01
00
01
01
02
01
01
01
00
(continued)
SERVICE MANUAL
PAGE18
PAGE19
PAGE20
PAGE21
LOGO1COLOR
LOGO2COLOR
LOGO1LINE
LOGO2LINE
LOGO1SIZE
LOGO2SIZE
LG1
LG2
WID
WIDS
DPC
DPCS
KEY
KEYS
ECCT
ECCB
HEHT
DPC69
HIT69
TREC
TREX
VEHT
SBY
SRY
SECD
SEC29
BASC
BASX
MODE3
BALC
FVOL
NVOL
OPT
OPT
OPT
OPT
OPT
OPT
OPT
OPT
OPT
OPT
OPT
OPT
OPT
OPT
OPT
OPT
04
OPT
OPT
30
60
00
08
08
10
00
40
70
01
40
13
5F
Notes:
12
SERVICE MANUAL
IR
KEY
Video
Amplifier
H.OUT
V.OUT
Audio
Amplifier
AVOUT
AVIN
Power Supply
Circuit
AVIN
TMP8897
TUNER
13
SERVICE MANUAL
2. CHASSIS DESCRIPTION
General Description
ETA-1D chassis is applied in PF29GA18A series.
By use of Toshiba V/C/D-MCU 2IN1 IC for TV small signal processing and bus control,
the chassis enables TV tuning, adjustment, control and picture correction, featuring
high-integration, high-performance-to-price ratio and high-reliability and compact circuit
with fewer external components. The chassis, widely used in small and medium TVs,
provides much more convenience for manufacturing and technical service. It includes:
2IN1 IC 8897PSBNG-4VB6 for PAL/NTSC small signal processing and bus control
EEPROM AT24C16 for data memory
LA78041 for vertical output power amplifying
LA42102 for audio power amplifying
TA1343N for audio processor
FSCQ1265RTYDTU for power circuit adjustment and control
The following features are available in the chassis:
Color systems: PAL, NTSC
Sound systems: D/K B/G I M
236 programs preset
AV stereo
2
I C bus control
Electronic program table
Intelligent lock
Biorhythm
Calendar inquiry
The chassis mainly uses the following ICs and assemblies.
Table 5 Key ICs and Assemblies
Serial
Position
No.
1
N201
Type
Description
EERPOM
2IN1 IC (Small signal processor +
micro control unit (MCU))
Audio power amplifier
Vertical scan output stage circuit
Switch-mode power supply
control
Tuner
N202
3
4
N603
N301
AT24C16
GDET0104-03
(TMPA8897PSANG)
LA42102
LA78041
N801
FSCQ1265RTYDTU
A001
TAF5-C4I23
14
SERVICE MANUAL
SERVICE DATA
TECHNICAL DATA OF KEY ICS
15
SERVICE MANUAL
2.Features
MCU
CCD Decoder
OSD
(TMPA8873CPANG)
ROM correction
12 I/O ports
Composition: 16 18 dots
BOX function
Jitter elimination
TV Processor
IF
RGB/Base-Band
Tank-coil
Video
Sync.
Black stretch
Y-gamma
Chroma
Sync output
AV Switch
PAL/NTSC demodulation
2 for video
2 for audio(mono)
or 1 for audio (Stereo, 2ch ATT), controlled by IIC bus
ALC (Auto-Audio Level Control)
16
SERVICE MANUAL
3.Block Diagram
17
Monolithic Linear IC
LA42102
10W 2-Channel BTL Power Amplifier
Tentative
LA42000 series is power IC which made Pin compatible possible altogether in 3 to 20W.
It enables communization of a set board.
mono, stereo, mono with volume function , stereo with volume function..
They realized PCB layout communalization of an audio power block of TV.
Functions
Po 10W x 2ch (VCC=14V,RL=8,THD=10%)
Builtin Standby function.
Builtin Mute function.
Full complement of built-in protection circuits
(Protection from shorting to ground, shorting to VCC,
load shorting, and overheating.)
Symbol
Conditions
Ratings
22
15
150
3
-25 to +75
-40 to +150
Unit
V
W
/W
Symbol
VCC
RL
VCC op
Conditions
Ratings
14
8
10 to 20
Unit
V
Conditions
ISTB
ICCO
Po
THD
VG
VNO
SVRR
Sep.
ATT
VMUTE - H
VMUTE - L
VSTB - H
VSTB - L
Ri
min
Amplifier off
Rg=0 , RL=open
THD=10%
Po=1W
Vo=0dBm
Rg=0,BPF=20Hz to 20kHz
Rg=0,fR=100Hz,VCCR=0dBm
Rg=10k, Vo=0dBm
8
33
40
50
80
1.7
0
2.5
0
21
Pdmax
Allowable power dissipation ,Pdmax - W
Standby current
Quiescent current
Output power
Total harmonic distortion
Voltage gain
Output noise voltage
Ripple rejection
Channel separation
Muting attenuation
Muting control voltage
The Pin 6 voltage
Symbol
18
16
15
14
12
11.7
10
8
6
5.8
4
Al heat sink
Mounting
torque 39N.
Flat washer
100x100x1.5mm
Silicone grease
applied
jc=3/W
50x50x1.5mm
No Fin
2
0
-20
20
40
60
80
100
Ambient temperrature, Ta -
120
140
160
Ratings
typ
0
70
10
0.06
35
0.2
50
60
90
30
max
10
0.2
37
0.4
3.0
0.5
20
0.5
39
Unit
uA
mA
W
%
dB
mVrms
dB
dB
dB
V
V
V
V
k
Block Diagram
Standby
VCC
Input amplifier
12 + OUT1
IN1 2
Output amplifier
Ri=
30k
11 - OUT1
MUTE 6
PWR
PRE
3
GND
10 GND
8 + OUT2
IN2 4
Output amplifier
Ri=
30k
9 - OUT2
Input amplifier
1
Ripple
Filter
Equivalent Circuit
LA42102
Ripple
Filter IN1
PRE
GND
IN2
C3
47uF
/25V
C1
4.7uF
/10V
PWR
STBY MUTE VCC +OUT2 -OUT2 GND -OUT1 +OUT1 N.C.
5
C2
4.7uF
/10V
7
C4
10uF
/10V
R1
15k
8
C5
1000uF
/25V
10
RL
C8
0.1uF
R4
2.2
11
12
RL
C9
0.1uF
R5
2.2
C7
0.1uF
R3
2.2
+ 5V
*The LA42102 uses a zero bias type input circuit, and the input pin potential is about zero volts.(0.01V)
Determine the polarity orientation of these capacitors based on the DC current from the circuit
Connected to the LA42102 front end.
C6
0.1uF
R2
2.2
13
SERVICE MANUAL
5. VERTICAL SCAN OUTPUT STAGE CIRCUIT LA78040/LA78041
Both LA78040/LA78041 are vertical scan output stage power amplifiers. But there is a little
bit difference between the two amplifiers, that is, LA78040 has supply voltage of 24V and output
current of 1.8AP-P while LA78041 has supply voltage of 30V and output current of 2.2AP-P.
LA78040/LA78041 (N602)
Vertical Deflection Output Circuit
1) Features
Low power dissipation due to built-in pump-up circuit
Vertical output circuit
Thermal protection circuit built in
Excellent crossover characteristics
DC coupling possible
Package Type:TO-220-7H
Fig.12
2) Block Diagram
32
SERVICE MANUAL
6. EEPROM AT24C04/08/16
1) Features
Low-voltage and Standard-voltage Operation
-2.7 (Vcc=2.7V to 5.5V)
-1.8 (Vcc=1.8V to 5.5V)
Internally Organized 128x8(1K), 256x8 (2K), 512x8 (4K),
1024x8 (8K) or 2048x8 (16K)
2-wire Serial Interface
Schmitt Trigger, Filtered Inputs for Noise Suppression
Bi-directional Data Transfer Protocol
100kHz (1.8V, 2.5V, 2.7V) and 400 kHz (5V) Compatibility
Write Protect Pin for Hardware Data Protection
8-byte Page (1K, 2K), 16-byte Page (4K, 8K, 16K) Write Modes
Partial Page Writes are Allowed
Self-timed Write Cycle (10 ms max)
High-reliability
-Endurance: 1 Million Write Cycles
- Data Retention: 100 Years
Automotive Grade and Extended Temperature Devices Available
8-lead PDIP, 8-lead JEDEC SOIC, 8-lead MAP and 8-lead TSSOP Package
2-wire
Serial EEPROM
AT24C01A
1K (128 x 8)
AT24C02
2K (256 x 8)
AT24C04
4K (512 x 8)
AT24C08
8K (1024 x 8)
AT24C16
6K (2048 x 8)
2) Description
The AT24C01A/02/04/08/16 provides 1024/2048/4096/8192/16384 bits of serial electrically erasable
and programmable read-only memory (EEPROM) organized as 128/256/512/1024/2048 words of 8 bits
each. The device is optimized for use in many industrial and commercial applications where low-power
and low-voltage operations are essential. The AT24C01A/02/04/08/16 is available in space-saving
8-pin PDIP, 8-lead JEDEC SOIC, 8-lead MAP and 8-lead TSSOP packages and is accessed via a
2-wire serial interface. In addition, the entire family is available in 2.7V (2.7V to 5.5V) and 1.8V (1.8V to
5.5V) versions.
33
SERVICE MANUAL
3) Pin Configuration
Table 12
8-lead
8-lead
TSSOP
MAP
Pin Name
Function
A0-A2
Address Inputs
A0
VCC
VCC
A0
SDA
Serial Data
A1
WP
WP
A1
SCL
A2
SCL
SCL
A2
GND
SDA
SDA
GND
WP
Write Protect
NC
No Connect
Bottom
View
Fig. 14
8-pin
PDIP
8-lead
VCC
A1
WP
A2
SCL
GND
SDA
A0
SOIC
VCC
A1
WP
A2
SCL
SDA
A0
GND
Fig. 15
4) Pin Description
SERIAL CLOCK (SCL): The SCL input is used to positive edge clock data into each EEPROM device
and negative edge clock data out of each device.
SERIAL DATA (SDA): The SDA pin is bi-directional for serial data transfer. This pin is open-drain
driven and may be wire-ORed with any number of other open-drain or open-collector devices.
DEVICE/PAGE ADDRESSES (A2, A1, A0): The A2, A1 and A0 pins are device address inputs that are
hard wired for the AT24C01A and the AT24C02. As many as eight 1K/2K devices may be addressed
on a single bus system (device addressing is discussed in detail under the Device Addressing section).
The AT24C04 uses the A2 and A1 inputs for hard wire addressing and a total of four 4K devices may
be addressed on a single bus system. The A0 pin is a no connect.
The AT24C08 only uses the A2 input for hardwire addressing and a total of two 8K devices may be
addressed on a single bus system. The A0 and A1 pins are no connects.
The AT24C16 does not use the device address pins, which limits the number of devices on a single bus
to one. The A0, A1 and A2 pins are no connects.
WRITE PROTECT (WP): The AT24C01A/02/04/16 has a Write Protect pin that provides hardware data
34
SERVICE MANUAL
protection. The Write Protect pin allows normal read/write operations when connected to ground (GND).
When the Write Protect pin is connected to Vcc, the write protection feature is enabled and operates as
shown in table 14.
Table 13
WP Pin
Status
24C01A
24C02
24C04
24C08
24C16
At Vcc
Full (1K)
Full (2K)
Full (4K)
Normal
Upper
Array
Array
Array
Read/
Half
Write
(8K)
Operation
Array
At GND
5) Memory Organization
AT24C01A, 1K SERIAL EEPROM: Internally organized with 16 pages of 8 bytes each, the 1K requires
a 7-bit data word address for random word addressing.
AT24C02, 2K SERIAL EEPROM: Internally organized with 32 pages of 8 bytes each, the 2K requires
an 8-bit data word address for random word addressing.
AT24C04, 4K SERIAL EEPROM: Internally organized with 32 pages of 16 bytes each, the 4K requires
a 9-bit data word address for random word addressing.
AT24C08, 8K SERIAL EEPROM: Internally organized with 64 pages of 16 bytes each, the 8K requires
a 10-bit data word address for random word addressing.
AT24C16, 16K SERIAL EEPROM: Internally organized with 128 pages of 16 bytes each, the 16K
requires an 11-bit data word address for random word addressing.
6) Block Diagram
Fig.16
7) Refer to Table 21 about Functions and Data of the ICs Pins.
35
www.fairchildsemi.com
FSCQ1265RT
PRODUCT
Open
Frame(1)
85-265VAC
Open Frame(1)
FSCQ0765RT
100 W
85 W
FSCQ1265RT
170 W
140 W
FSCQ1565RT
210 W
170 W
Typical Circuit
Application
CTV
DVD Receiver
Audio Power Supply
Vo
AC
IN
Description
In general, Quasi-Resonant Converter (QRC) shows lower
EMI and higher power conversion efficiency compared to the
conventional hard switched converter with a fixed switching
frequency. Therefore, it is well suited for applications that are
sensitive to the noise, such as color TV and audio. The
FSCQ1265RT is an integrated Pulse Width Modulation
(PWM) controller and Sense FET specifically designed for
Quasi-resonant off-line Switch Mode Power Supplies
(SMPS) with minimal external components. The PWM
controller includes integrated fixed frequency oscillator, under
voltage lockout, leading edge blanking (LEB), optimized gate
driver, internal soft start, temperature compensated precise
current sources for a loop compensation and self protection
circuitry. Compared with discrete MOSFET and PWM
controller solution, it can reduce total cost, component count,
size and weight simultaneously increasing efficiency, productivity, and system reliability. This device is a basic platform
well suited for cost effective designs of Quasi resonant
switching flyback converters.
FSCQ1265R T
Dr ain
PW M
Sync
GN D
V FB
V cc
Rev.1.0.0
2004 Fairchild Semiconductor Corporation
FSCQ1265RT
Sync
5
Drain
1
Threshold
Quasi-resonant
(QR) switching
controller
fs
9V/15V
Soft start
4.6V/2.6V : Normal QR
3.0V/1.8V : Extended QR
Burst mode
Controller
VBurst
Normal operation
Vcc
Auxiliary
Vref
OSC
Burst Switching
Vref
Vref
Ibufb
IFB
Main bias
Normal
operation
Vref
Internal
bias
Ib
Idelay
FB
Vcc good
PWM
4
2.5R
Gate
driver
R
LEB
600ns
VSD
Sync
Vovp
Vcc good
AOCP
Q
2 GND
TSD
Power Reset
Vocp
FSCQ1265RT
Pin Definitions
Pin Number
Pin Name
Drain
GND
Vcc
This pin is the positive supply input. This pin provides internal operating
current for both start-up and steady-state operation.
Vfb
This pin is internally connected to the inverting input of the PWM comparator.
The collector of an opto-coupler is typically tied to this pin. For stable
operation, a capacitor should be placed between this pin and GND. If the
voltage of this pin reaches 7.5V, the over load protection triggers resulting in
shutdown of the FPS.
Sync
This pin is internally connected to the sync detect comparator for quasi
resonant switching. In normal quasi-resonant operation, the threshold of the
sync comparator is 4.6V/2.6V. Meanwhile, the sync threshold is changed to
3.0V/1.8V in extended quasi-resonant operation.
Pin Configuration
TO-220F-5L
5.Sync
4.Vfb
3.Vcc
2.GND
1.Drain
FSCQ1265RT
(1)
Symbol
Value
Unit
VDSS
650
VDGR
650
VGS
30
IDM
36
ADC
EAS
950
mJ
ID
5.3
ADC
ID
3.4
ADC
VCC
20
Supply Voltage
Vsync
-0.3 to 13V
VFB
-0.3 to VCC
PD
50
TJ
+150
TA
-25 to +85
TSTG
-55 to +150
Thermal Resistance
Rthjc
2.5
C/W
Notes:
1. Tj = 25C to 150C
2. Repetitive rating: Pulse width limited by maximum junction temperature
3. L = 21mH, VDD = 50V, RG = 25, starting Tj = 25C