Table of Contents
Advertisement
LTM4700
PMBus COMMAND DETAILS
For both equations,
G = MFR_TEMP_1_GAIN • 2
O = MFR_TEMP_1_OFFSET
Bit[2] is now reserved, and Ultra Low DCR mode is default.
Bit[1] of this command determines if the part is in high range or low voltage range. Changing this bit value changes
the PWM loop gain and compensation. This bit value should not be changed when the channel output is active. Writing
this bit when the channel is active will generate a CML fault.
Bit[0] determines if the PWM mode of operation is discontinuous (pulse-skipping mode), or forced continuous con-
duction mode. Whenever the channel is ramping on, the PWM mode will be discontinuous, regardless of the value of
this bit. This command has one data byte.
MFR_PWM_COMP
The MFR_PWM_COMP command sets the g
compensation resistors. This command affects the loop gain of the PWM output which may require modifications to
the external compensation network.
BIT
MEANING
BIT [7:5]
Error Amplifier GM Adjust (mS)
000b
001b
010b
011b
100b
101b
110b
111b
BIT [4:0]
00000b
00001b
00010b
00011b
00100b
00101b
00110b
00111b
01000b
01001b
01010b
01011b
01100b
01101b
01110b
82
–14
, and
of the PWM channel error amplifiers and the value of the internal R
m
1.00
1.68
2.35
3.02
3.69
4.36
5.04
5.73
R
(kΩ)
ITH
0
0.25
0.5
0.75
1
1.25
1.5
1.75
2
2.5
3
3.5
4
4.5
5
For more information
www.analog.com
ITHn
Rev. B
Advertisement
Table of Contents
