SG6848T Ver la hoja de datos (PDF) - Unspecified
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SG6848T Datasheet PDF : 13 Pages
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Low Cost Green-Mode PWM Controller for Flyback Converters
Product Specification
SG6848
MARKING DIAGRAMS
MXYWW
1
M: Mask Version
X: A=SG6848
D=SG6848 (Lead Free)
Y: Year; WW: Work Week
8
SG6848DP
XXXXXXXYYWWV
1
D: D=DIP
P : Z =Lead Free
Null=Regular Package
XXXXXXX: Wafer Lot
YY: Year; WW: Week
V: Assembly Location
PIN CONFIGURATION
GND
FB
RI
SOT-26
1
6
2
5
3
4
GATE
VDD
SENSE
DIP-8
GATE 1
VDD 2
NC 3
SENSE 4
8 GND
7 FB
6 NC
5 RI
ORDERING INFORMATION
Part Number
PWM Frequency
SG6848T
70kHz
SG6848D
70kHz
SG6848TZ
70kHz
SG6848DZ
70kHz
Package
6-Pin SOT-26
8-pin DIP-8
6-Pin SOT-26 (Lead Free)
8-pin DIP-8 (Lead Free)
PIN DESCRIPTIONS
Name Pin No.
Type
DIP-8 / (SOT-26)
GATE 1 / (6)
Driver Output
VDD
2 / (5)
Supply
NC
3
SENSE 4 / (4)
Analog Input
RI
5 / (3)
NC
6
FB
7 / (2)
Analog
Input/Output
Analog Input
Function
The totem-pole output driver for driving the power MOSFET.
Power supply.
NC pin.
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.
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 Ri results in a 50uA constant
current Ii and a 70kHz switching frequency.
NC pin.
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.
GND 8 / (1)
Supply
Ground.
© System General Corp.
-2-
Version 1.4(IRO33.0010.B2)
www.sg.com.tw
Apr.08, 2004
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