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SG6846A Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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SG6846A Datasheet(HTML) 1 Page - Fairchild Semiconductor |
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1 / 15 page  September 2008 © 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com SG6846A • Rev. 1.1.4 SG6846A Highly Integrated Green-Mode PWM Controller Features Low Startup Current: 8µA Low Operating Current: 3.7mA Peak-Current Mode of Operation with Cycle-by- Cycle Current Limiting PWM Frequency Continuously Decreasing with Burst Mode at Light Loads VDD Over-Voltage Protection (OVP) AC Input Brownout Protection with Hysteresis Constant Output Power Limit (Full AC Input Range) Internal Latch Circuit for OVP, OTP, and OCP Two-level OCP Delay: 1600ms Output Short-Circuited Delay Time: 100ms Programmable PWM Frequency with Frequency Hopping OCP Threshold is Half Peak Current Limit Feedback Open-loop Protection with 1700ms Delay Built-in Soft-Start Applications General-purpose switch-mode power supplies and flyback power converters, including: Power Adapters Open-frame SMPS SMPS with Surge-current Output, such as for Printers, Scanners, Motor Drivers Description The SG6846A is especially designed for SMPS with surge-current output, incorporated with a two-level OCP function. Besides the cycle-by-cycle current limiting, if the switching current is higher than two thirds the peak- current threshold for 1700ms, over-current protection is activated such that the SG6846A is latched off. If the switching current is higher than two thirds of the peak-current threshold for 100ms, and the voltage on the VDD is still higher than VDD-OFF + 1V, the PWM pulses are latched off immediately once the VDD voltage is lower than VDD-OFF + 1V. This is useful when an output short circuit occurs. SG6846A also integrates a frequency-hopping function internally to reduce EMI emission of a power supply with minimum line filters. Its built-in synchronized slope compensation provides proprietary internal compensation for constant output power limit over universal AC input range. Also, the gate output is clamped at 18V to protect the external MOSFET from over-voltage damage. Internal soft-start is built-in to soften the stress on the MOSFET and startup current during power on period. Other protection functions include AC input brownout protection with hysteresis, VDD over-voltage protection, and over-temperature protection. For over-temperature protection, an external NTC thermistor can be applied to sense the ambient temperature. When OCP, VDD OVP, or OTP is activated, an internal latch circuit latches off the controller. The PWM pulses stay latched off until the power supply is disconnected from the mains outlet. SG6846A controller is available in 8-pin SOP package. Ordering Information Part Number Operating Temperature Range OCP Latch Eco Status Package Packing Method SG6846ALSY -40 to +105°C Yes Green 8-Pin Small Outline Package (SOP) Tape & Reel SG6846ACSY -40 to +105°C No Green 8-Pin Small Outline Package (SOP) Tape & Reel SG6846ALSZ -40 to +105°C Yes RoHS 8-Pin Small Outline Package (SOP) Tape & Reel For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. |
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