Harman Kardon DVD 37 (serv.man6) Service Manual ▷ View online
Product Specification
Low Cost Green-Mode PWM Controller for Flyback Converters
SG6848
© System General Corp.
- 2 -
www.sg.com.tw
Version 1.2(IRO33.0010.B0)
May.06, 2003
MARKING DIAGRAMS
PIN CONFIGURATION
ORDERING INFORMATION
Part Number
PWM Frequency
Package
SG6848T 70kHz
6-Pin
SOT-26
SG6848D 70kHz
8-pin
DIP-8
PIN DESCRIPTIONS
Pin No.
Name
DIP-8 / (SOT-26)
Type Function
GATE
1 / (6)
Driver Output The totem-pole output driver for driving the power MOSFET.
VDD
2 / (5)
Supply
Power supply.
NC 3
NC
pin.
SENSE 4 / (4)
Analog Input
Current sense. This pin senses the voltage across a resistor. When the voltage reaches
the internal threshold, PWM output is disabled. This activates over-current protection.
This pin also provides current amplitude information for current-mode control.
the internal threshold, PWM output is disabled. This activates over-current protection.
This pin also provides current amplitude information for current-mode control.
RI
5 / (3)
Analog
Input/Output
Input/Output
A resistor connected from the RI pin to ground will generate a constant current source for
the SG6848. This current is used to charge an internal capacitor, to determine the
switching frequency. Increasing the resistance will reduce the amplitude of the current
source and reduce the switching frequency. A 95kΩ resistor R
the SG6848. This current is used to charge an internal capacitor, to determine the
switching frequency. Increasing the resistance will reduce the amplitude of the current
source and reduce the switching frequency. A 95kΩ resistor R
i
results in a 50uA constant
current I
i
and a 70kHz switching frequency.
NC 6
NC
pin.
FB
7 / (2)
Analog Input
Feedback. The FB pin provides the output voltage regulation signal. It provides feedback
to the internal PWM comparator, so that the PWM comparator can control the duty cycle.
to the internal PWM comparator, so that the PWM comparator can control the duty cycle.
GND
8 / (1)
Supply
Ground.
M
: Mask Version
Y
: Year;
WW
: Work Week
1
2
3
3
4
5
6
SOT-26
GND
FB
RI
GATE
VDD
SENSE
1
M
A
YWW
XXXXXXX
: Wafer Lot
YY
: Year;
WW
: Week
V
: Assembly Location
8
1
SG6848D
XXXXXXXYYWWV
harman/kardon
Service manual DVD37EU
Page 109 of 117
Product Specification
Low Cost Green-Mode PWM Controller for Flyback Converters
SG6848
© System General Corp.
- 3 -
www.sg.com.tw
Version 1.2(IRO33.0010.B0)
May.06, 2003
BLOCK DIAGRAM
V
DD
2 (5)
RI
UVLO
16.3V/11.7V
Internal
Bias
Bias
_
+
OSC
5 (3)
R
Q
S
OCP
Comp
Comp
PWM
Comp
Comp
Slope
Compensation
Compensation
Vlimit
ramp
Green
Mode
Controller
Mode
Controller
ON/OFF
Driver
Driver
7 (2)
4.8V
FB
1 (6)
V
DD
SENSE
4 (4)
GATE
Blanking
Circuit
Circuit
8 (1)
GND
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter
Value
Unit
V
DD
DC Supply Voltage *
Zener Clamp
Zener Current
Zener Clamp
Zener Current
25
26
10
26
10
V
V
mA
V
mA
V
FB
Input Voltage to FB Pin
-0.3 to 6 V
V
V
Sense
Input Voltage to Sense Pin
-0.3 to 6V
V
P
d
Power
Dissipation
300
mW
T
J
Operating Junction Temperature
150
℃
SOT-26 208.4
°C/W
R
θ
JA
Thermal Resistance (Junction to Air)
DIP-8 82.5
°C/W
T
stg
Storage Temperature Range
-55 to +150
℃
T
L
Lead Temperature (Soldering)
20 sec SOT-26
10 sec DIP-8
10 sec DIP-8
220
260
260
°C
ESD Capability, HBM Model
3.0
kV
ESD Capability, Model
300
V
* All voltage values, except differential voltages, are given with respect to the network ground terminal.
harman/kardon
Service manual DVD37EU
Page 110 of 117
harman/kardon
Service manual DVD37EU
Page 111 of 117
DVD Player Block Diagram (DVD 37 & 37/230)
S
C
A
R
T
FILTER
Y
Pb
Pr
Comp.
S-Video
HDMI OUT
TRANSM.
ZR36721
Coax.
SPDIF OUT
Optical
AUDIO PCM OUT
T.R BUFFER
DSD OUT
LT/RT
FL/FR
RL/RR
CS4392
+6dB OPAMP
SW/C
Not used For DVD 37
PHOTO
COUPLER
COUPLER
IN
Out
Out
KP1010B
SYSTEM
AUDIO
DAC
SMPS Ass'y
COP11840C
Key Pad
VFD (CIG Type) 13BT229GINK
BUFFER
74HCT7007
SDRAM 64M
M12L64164A7T
Remote
Sensor
SYSTEM u-COM
ST72F324K2
8MHz
OSC
TRAVERSE UNIT
(SANYO PICK-UP HD62)
16M Bit
FLASH u-COM
M29W160ET70N
DV-342FV
RF SERVO
ZR36707
M P E G
ZR36778
HDMI
27MHz
OSC
T.R MUTE
Control
3CH
VIDEO DRV.
BA7660FS
EEPROM
24C08
6CH.
VIDEO
DRV.
BH7862FS
Built in
filter
EUR ONLY
VIDEO
OPEN/CLOSE &
AM5888S
SPINDLE MOTOR
& SLED
CONTROL
DSD
DECODER
SAA7893
SDRAM 64M
M12L64164A7T
M12L64164A7T
PCM/DSD
CLK
SELECT
MUX.
CLK
SELECT
MUX.
74LVC157
harman/kardon
Service manual DVD37EU
Page 112 of 117
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