Specifications |
| SG6846ACSY | Full Production | Green | $0.346 | SOIC | 8 | TAPE REEL | | Line 1: $Y (Fairchild logo)
&Z (Asm. Plant Code)
&2 (2-Digit Date Code)
&K Line 2: 6846AC Line 3: SYB |
| SG6846ALSY | Full Production | Green | $0.394 | SOIC | 8 | TAPE REEL | | Line 1: $Y (Fairchild logo)
&Z (Asm. Plant Code)
&2 (2-Digit Date Code)
&K Line 2: 6846AL Line 3: SYB |
| SG6846ALSZ | Full Production | RoHS Compliant | $0.295 | SOIC | 8 | TAPE REEL | | Line 1: SG6846ALSZ Line 2: B3&6&3&Z |
* Fairchild 1,000 piece Budgetary Pricing
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| ** A sample button will appear if the part is available through Fairchild's on-line samples program. If there is no sample button, please contact a Fairchild distributor to obtain samples |
Package marking information for product SG6846A is available. Click here for more information . |
DescriptionThe highly integrated SG6846A series of PWM controllers provides features to enhance the performance of flyback converters.To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to continuously decreasethe switching frequency under light-load conditions. Under zero-load conditions, the power supply enters burst-mode.
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 for1700ms, over-current protection is activated and the SG6846A latches off.
If the switching current of SG6846A is higher than two thirds the peak-current threshold for 100ms and the voltage on the VDD pinis higher than VDD-OFF + 1V, the PWM pulses are latched off immediately once VDD voltage is lower than VDD-OFF + 1V;useful if an output short-circuit occurs.
SG6846A also integrates a frequency hopping function that reduces 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 a 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 reduce stress on the MOSFET and start-up 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 of SG6846A can be applied to sense the ambient temperature. When OCP, VDD OVP, or OTP are activated, an internal latch circuit is used to latch-off the controller.The PWM pulses stay latched off until the power supply is unplugged from the main outlet.
SG6846A is available in an 8-pin SOP package.
SG6846A Data Sheet
