Ordering Information - Harman Kardon DVD 38 Service Manual

DVD38
Low Cost Green-Mode PWM Controller for Flyback Converters
MARKING DIAGRAMS
MAYWW
1
8
SG6848D
XXXXXXXYYWWV
1

ORDERING INFORMATION

Part Number
SG6848T
SG6848D
PIN DESCRIPTIONS
Pin No.
Name
DIP-8 / (SOT-26)
GATE 1 / (6)
VDD 2 / (5)
NC 3
SENSE 4 / (4)
RI 5 / (3)
NC 6
FB 7 / (2)
GND 8 / (1)
© System General Corp.
Version 1.2(IRO33.0010.B0)
M: Mask Version
Y: Year; WW: Work Week
XXXXXXX: Wafer Lot
YY: Year; WW: Week
V: Assembly Location
PWM Frequency Package
70kHz 6-Pin SOT-26
70kHz 8-pin DIP-8
Type Function
Driver Output The totem-pole output driver for driving the power MOSFET.
Supply Power supply.
NC pin.
Current sense. This pin senses the voltage across a resistor. When the voltage reaches
Analog Input the internal threshold, PWM output is disabled. This activates over-current protection.
This pin also provides current amplitude information for current-mode control.
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
Analog
switching frequency. Increasing the resistance will reduce the amplitude of the current
Input/Output
source and reduce the switching frequency. A 95kΩ resistor R
current I and a 70kHz switching frequency.
i
NC pin.
Feedback. The FB pin provides the output voltage regulation signal. It provides feedback
Analog Input
to the internal PWM comparator, so that the PWM comparator can control the duty cycle.
Supply Ground.
PIN CONFIGURATION
GND
FB
RI
GATE
VDD
NC
SENSE
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137
harman/kardon
Product Specification
SG6848
SOT-26
GATE
1
6
2 5 VDD
3
4 SENSE
DIP-8
1 GND
8
FB
2
7
3 6 NC
4
5 RI
results in a 50uA constant
i
www.sg.com.tw
May.06, 2003