参数资料
型号: LTC3880EUJ#PBF
厂商: Linear Technology
文件页数: 83/112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
Fault Responses Outpu t Current
COMMAND NAME
CMD CODE DESCRIPTION
TYPE
PAGED
DATA
FORMAT
UNITS
NVM
DEFAULT
VALUE
IOUT_OC_FAULT_RESPONSE
0x47
Action to be taken by the device when an
output overcurrent fault is detected.
R/W Byte
Y
Reg
Y
0x00
IOUT_OC_FAULT_RESPONSE
The IOUT_OC_FAULT_RESPONSE command instructs the device on what action to take in response to an output
overcurrent fault. The data byte is in the format given in Table 7.
The device also:
? Sets the IOUT_OC bit in the STATUS_BYTE
? Sets the IOUT bit in the STATUS_WORD
? Sets the IOUT Overcurrent Fault bit in the STATUS_IOUT command, and
? Notifies the host by asserting ALERT pin
This command has one data byte.
Table 7. IOUT_OC_FAULT_RESPONSE Data Byte Contents
BITS
7:6
DESCRIPTION
Response
For all values of bits [7:6], the LTC3880:
? Sets the corresponding fault bit in the status commands and
? Notifies the host by asserting ALERT pin
The fault bit, once set, is cleared only when one or more of the
following events occurs:
? The device receives a CLEAR_FAULTS command
? The output is commanded through the RUN n pin, the
OPERATION command, or the combined action of the RUN n pin
and OPERATION command, to turn off and then to turn back on,
or
? Bias power is removed and reapplied to the LTC3880.
VALUE
00
01
10
11
MEANING
The LTC3880 continues to operate indefinitely while maintaining
the output current at the value set by IOUT_OC_FAULT_LIMIT
without regard to the output voltage (known as constant-
current or brick-wall limiting).
Not supported.
The LTC3880 continues to operate, maintaining the output
current at the value set by IOUT_OC_FAULT_LIMIT without
regard to the output voltage, for the delay time set by bits [2:0].
If the device is still operating in current limit at the end of the
delay time, the device responds as programmed by the Retry
Setting in bits [5:3].
The LTC3880 shuts down immediately and responds as
programmed by the Retry Setting in bits [5:3].
5:3
Retry Setting
000-110 The unit does not attempt to restart. The output remains
disabled until the fault is cleared by cycling the RUN n pin or
removing bias power.
111
The device attempts to restart continuously, without limitation,
until it is commanded OFF (by the RUN n pin or OPERATION
command or both), bias power is removed, or another fault
condition causes the unit to shut down. Note: The retry interval
is set by the MFR_RETRY_DELAY command.
2:0
Delay Time
XXX
The number of delay time units in 16ms increments. This
delay time is used to determine the amount of time a unit is
to continue operating after a fault is detected before shutting
down. Only valid for deglitched off state.
3880fb
For more information www.linear.com/LTC3880
83
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