SG6846 查看數據表（PDF） - Unspecified

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SG6846

Highly-Integrated Green-Mode PWM Controller

Unspecified 

Highly-Integrated Green-Mode PWM Controller

voltage over 0.92V, the PWM output will be turned on

again. The hysteresis window for ON/OFF is around

0.2V.

Product Specification

SG6846

RT pin drops below 1.065V, the SG6846 will be turned

off. There are two options for the protection modes,

please see ORDER INFORMATION.

VDD Over-voltage Protection

VDD over-voltage protection is built in to prevent

the controller from over-voltage destruction. When VDD

voltage is over 23.6V, the SG6846 is latched off.

Over-temperature Protection

An external NTC thermistor can be connected from

the RT pin to GND. The impedance of the NTC will

decrease at high temperatures. When the voltage of the

Noise immunity

Noise from the current sense or the control signal

may cause significant pulse width jitter, particularly in

continuous-conduction mode. Slope compensation helps

alleviate this problem. Good placement and layout

practices should be followed. The designer should

avoiding long PCB traces and component leads.

Compensation and filter components should be located

near the SG6846.

© System General Corp.

Version 1.0(IAO33.0008.B0)

- 10 -

www.sg.com.tw

Sep. 30, 2004

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