参数资料
型号: LTC3880EUJ#PBF
厂商: Linear Technology
文件页数: 70/112页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 40-QFN
软件下载: LTpowerPlay™
标准包装: 61
系列: PolyPhase®
PWM 型: 电流模式
输出数: 2
频率 - 最大: 1MHz
电源电压: 4.5 V ~ 24 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 105°C
封装/外壳: 40-WFQFN 裸露焊盘
包装: 管件
LTC3880/LTC3880-1
PMBus COMMAND DETAILS
Output Voltage and Limits
COMMAND NAME
VOUT_MODE
CMD CODE DESCRIPTION
0x20 Output voltage format and exponent (2 –12 ).
TYPE
R Byte
PAGED
Y
DATA
FORMAT UNITS
Reg
NVM
DEFAULT
VALUE
2 –2
0x14
VOUT_MAX
VOUT_OV_FAULT_ LIMIT
VOUT_OV_WARN_ LIMIT
VOUT_MARGIN_HIGH
VOUT_COMMAND
VOUT_MARGIN_LOW
VOUT_UV_WARN_ LIMIT
VOUT_UV_FAULT_ LIMIT
POWER_GOOD_ON
POWER_GOOD_OFF
MFR_VOUT_MAX
0x24
0x40
0x42
0x25
0x21
0x26
0x43
0x44
0x5E
0x5F
0xA5
Upper limit on the output voltage the unit can
command regardless of any other commands.
Output overvoltage fault limit.
Output overvoltage warning limit.
Margin high output voltage set point. Must be
greater than VOUT_COMMAND.
Nominal output voltage set point.
Margin low output voltage set point. Must be
less than VOUT_COMMAND.
Output undervoltage warning limit.
Output undervoltage fault limit.
Output voltage at or above which a power
good should be asserted.
Output voltage at or below which a power
good should be de-asserted.
Maximum allowed output voltage.
R/W Word
R/W Word
R/W Word
R/W Word
R/W Word
R/W Word
R/W Word
R/W Word
R/W Word
R/W Word
R Word
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
L16
L16
L16
L16
L16
L16
L16
L16
L16
L16
L16
V
V
V
V
V
V
V
V
V
V
V
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
4.096 Ch0
0x4189
5.5 Ch1
0x5800
1.1
0x119A
1.075
0x1133
1.05
0x10CD
1.0
0x1000
0.95
0x0F33
0.925
0x0ECD
0.9
0x0E66
0.93
0x0EE1
0.92
0x0EB8
4.096 Ch0
5.5 Ch1
VOUT_MODE
The data byte for VOUT_MODE command, used for commanding and reading output voltage, consists of a 3-bit mode
(only linear format is supported) and a 5-bit parameter representing the exponent used in output voltage Read/Write
commands.
This read-only command has one data byte
VOUT_MAX
The VOUT_MAX command sets an upper limit on the output voltage, in volts, the unit can command regardless of any
other commands or combinations.
This command has two data bytes and is formatted in Linear_16u format.
VOUT_OV_FAULT_LIMIT
The VOUT_OV_FAULT_LIMIT command sets the value of the output voltage measured at the sense pins, in volts, which
causes an output overvoltage fault.
If the VOUT_OV_FAULT_LIMIT is modified and the switcher is active, allow 10ms after the command is modified to
assure the new value is being honored. The part indicates if it is busy making a calculation. Monitor bits 5 and 6 of
MFR_COMMON. Either bit is low if the part is busy. If this wait time is not met, and the VOUT_COMMAND is modified
above the old overvoltage limit, an OV condition might temporarily be detected resulting in undesirable behavior and
possible damage to the switcher. 3880fb
70
For more information www.linear.com/LTC3880
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