sg6741tp Fairchild Semiconductor, sg6741tp Datasheet - Page 2

• Manufacturer Part Number: sg6741tp
• Description: Sg6741-highly-integrated Green-mode Pwm Controller
• Manufacturer: Fairchild Semiconductor

Highly-Integrated Green-Mode PWM Controller
MARKING INFORMATION
ORDERING INFORMATION
Part Number
SG6741SZ
PIN DESCRIPTIONS
1
2
3
4
5
6
7
8
© System General Corp.
Version 1.3.1 (IAO33.0047.B3)
Pin No. Symbol
SG6741TP
XXXXXXXXYWWV
GND
FB
NC
HV
RI
SENSE
VDD
GATE
Pb-Free
Function
Ground
Feedback
NA
Start-up Input
Reference Setting
Current Sense
Power Supply
Driver Output
T: S = SOP
P:
XXXXXXXX:
Y: Year; WW: Week
V: Assembly Location
Z =Lead Free
Null=regular package
Package
SOP-8
Description
Ground.
The signal from the external compensation circuit is fed into this pin. The PWM duty cycle
is determined in response to the signal on this pin and the current-sense signal on the
SENSE pin.
NC pin.
For start-up, this pin is pulled high to the line input or bulk capacitor via resistors.
A resistor connected from the RI pin to GND pin provides the SG6741 with a constant
current source. This determines the center PWM frequency. Increasing the resistance
reduces PWM frequency. Using a 26KΩ resistor (R
frequency.
Current sense. The sensed voltage is used for peak-current-mode control and
cycle-by-cycle current limiting.
Power supply. The internal protection circuit disables PWM output as long as V
the OVP trigger point.
The totem-pole output driver. Soft driving waveform is implemented for improved EMI.
Wafer Lot
- 2 -
PIN CONFIGURATION
GND
FB
NC
HV
www.sg.com.tw • www.fairchildsemi.com
I
) results in a 65kHz center PWM
Product Specification
GATE
VDD
RI
SENSE
October 30, 2007
SG6741
DD
exceeds