SG6860 Fairchild Semiconductor, SG6860 Datasheet - Page 3

• Manufacturer Part Number: SG6860
• Description: Green-Mode PWM Controller
• Manufacturer: Fairchild Semiconductor

© 2008 Fairchild Semiconductor Corporation
SG6860 • Rev. 1.0.1
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Pin Configuration
Pin Definitions
Pin #
DIP
1
2
3
4
5
6
7
8
Figure 3. DIP Pin Configuration (Top View)
(SOT)
Pin #
(6)
(5)
(4)
(3)
(2)
(1)
--
--
SENSE
Name
GATE
GND
VDD
NC
NC
FB
RI
Description
Driver Output. The totem-pole output driver for driving the power MOSFET.
Power Supply.
No Connection.
Current Sense. This pin senses the voltage across a resistor. When the voltage
reaches the internal threshold, PWM output is disabled, which activates over-current
protection. This pin also provides current amplitude data for current-mode control.
Reference Setting. A resistor connected from the RI pin to ground generates a
constant current source used to charge an internal capacitor and determine the
switching frequency. Increasing the resistance reduces the amplitude of the current
source and reduces the switching frequency. A 95kΩ resistor, R
constant current, I
No Connection.
Feedback.
Ground. For ATX SMPS, it detects AC line voltage through the main transformer.
I
, and a 70kHz switching frequency.
3
Figure 4. SOT Pin Configuration (Top View)
I
, results in a 13µA
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