Page 54 - GIGABYTE Service Manual-v3.0-110101

Pin Signal Definition

21 VCC Supplies the power necessary to operate the chip
41 EN_VTT PWM enable signals
40 EN_PWR PWM enable power

42 FS To set up the desired switching frequency
14 APA is used to adjust the Adaptive Phase alignment trip level
COMP is tied back to FB through an external R-C
15 COMP
network to compensate the regulator
20 TCOMP Temperature compensation scaling input
Use this pin to set up the desired start-up oscillator
43 SS
frequency

12 DAC Digital-to Analog Converter
13 REF Reference voltage
44 OVP Over voltage protection(NC)

FB can set the load line (droop). The droop scale factor is
16 FB
set by the ratio of the ISEN resistors
IMON is a current output of the average of the sum of
11 IMON
each phase’s sensed current

VDIFF is the amplifier’s output and the input to the
17 VDIFF
regulation and protection circuitry
The OFS pin provides a means to program a DC offset

10 OFS current for generating a DC offset voltage at the REF
input
9 PWM_PSI The PSI# pin is used to change the state of the controller
indicates that the soft-start is completed and the output
45 VR_RDY
voltage is within the regulated range around VID setting
19 VSEN Voltage sense input
48 TM Is an input pin for VR temperature measurement.

is used as an indication of high VR temperature, It will be
47 VR_HOT open when the measured VR temperature reaches a certain
level
is an output pin with open-drain logic output, It will be

46 VR_FAN open when the measured VR temperature reaches a certain
level

ISEN1,2,3,4,5,6/+,- Current Sense inputs
PWM1,2,3,4,5,6 Pulse Width Modulation outputs,

Table 3-2: The definition of PWM signals

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