AT1051Z Switching Power Supply Fan Controller
General Description
The AT1051 is a high efficiency, low BOM cost FAN controller for PC and Server Power Supply. It could real
time feedback both Mother Board and Power Supply temperature signals through TSET and FANCMD setting.
TSET connect a thermistor to gnd, and a resister to TEAO to seting the analog thermal feedback voltage, The TEAO voltage decide the PWM duty signal to control the FAN speed from PWMO. The Mother Board thermal information usually is duty PWM signal, the signal would input to controller from FANCMD and integrated to a DC voltage to decide the feedback duty cycle to PWMO to modulate the FAN speed.
AT1051 also integrated a boost convertor inside the chip.
When Power Supply temperature increased and result in TEAO larger than 3.6V the boost loop would be
enable.
AT1051 would enter turbo boost mode to boost VCC up to 16V to speed up the FAN. And if the tempture
is so high that TEAO is larger than 3.8V, PGO would be pull low to shutdown the Power system.
( Patent Protected )
AT1051Z Switching Power Supply Fan Controller