sg6742tp Fairchild Semiconductor, sg6742tp Datasheet - Page 2

• Manufacturer Part Number: sg6742tp
• Description: Sg6742-highly Integrated Green-mode Pwm Controller
• Manufacturer: Fairchild Semiconductor

Highly Integrated Green-Mode PWM Controller
MARKING INFORMATION
ORDERING INFORMATION
Part Number
SG6742SZ
SG6742DZ (Preliminary) 65KHz
PIN DESCRIPTIONS
Pin No.
1
2
3
4
5
6
7
8
© System General Corp.
Version 1.0.1 (IAO33.0083.B0)
SG6742TP
XXXXXXXXYWWV
Symbol
GND
FB
NC
HV
RT
SENSE
VDD
GATE
Function
Ground
Feedback
NA
Start-up Input
Temperature
Detection
Current Sense
Power Supply
Driver Output
PWM Frequency Pb-Free Package
65KHz
T: D = DIP, S = SOP
P:
XXXXXXXX:
Y: Year; WW: Week
V: Assembly Location
Z =Lead Free
Null=regular package
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 SENSE pin.
NC pin.
For start-up, this pin is pulled high to the line input or bulk capacitor via resistors.
For over-temperature protection, an external NTC thermistor is connected from this pin to GND
pin. The impedance of the NTC decreases at high temperatures. Once the voltage of the RT
pin drops below a fixed limit, PWM output is disabled.
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
OVP trigger point.
The totem-pole output driver. Soft driving waveform is implemented for improved EMI.
Wafer Lot
SOP-8
DIP-8
- 2 -
PIN CONFIGURATION
GND
NC
HV
FB
www.sg.com.tw • www.fairchildsemi.com
Product Specification
September 24, 2007
GATE
VDD
SENSE
RT
DD
exceeds the
SG6742