参数资料
型号: ADM1276-3ACPZ-RL
厂商: Analog Devices Inc
文件页数: 19/48页
文件大小: 0K
描述: IC HOT SWAP CTLR PMBUS 20LFCSP
标准包装: 5,000
类型: 热交换控制器
应用: 通用
内部开关:
电流限制: 可调
电源电压: 2.95 V ~ 20 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 20-WQFN 裸露焊盘,CSP
供应商设备封装: 20-LFCSP-WQ(5x5)
包装: 带卷 (TR)
Data Sheet
ADM1276
2.95V
TO 20V
Q 1
V
SS
FLB
SENSE+
SENSE–
1V
ISET
VCC
BIAS
CURRENT
GND
GATE
CURRENT-LIMIT
REFERENCE
Figure 43. Connection of Multiple Sense Resistors to the SENSE± Pins
CURRENT-LIMIT REFERENCE
The current-limit reference voltage determines the load current
level to which the ADM1276 limits the current during an over-
current event. This reference voltage is compared to the gained-up
current sense voltage to determine whether the limit is reached.
An internal current-limit reference selector block continuously
compares the ISET, soft start, and foldback voltages to determine
which voltage is the lowest at any given time; the lowest voltage
is used as the current-limit reference. This ensures that the pro-
grammed current limit, ISET, is used in normal operation, and
that the soft start and foldback features reduce the current limit
when required during startup and/or fault conditions.
0.2V
0.1V
t
Figure 45. Interaction of Soft Start, Foldback, and ISET Current Limits
SETTING THE CURRENT LIMIT (ISET)
The maximum current limit is partially determined by selecting
a sense resistor to match the current sense voltage limit on the
controller for the desired load current. However, as currents
become larger, the sense resistor requirements become smaller,
and resolution can be difficult to achieve when selecting the
appropriate sense resistor. The ADM1276 provides an adjustable
current sense voltage limit to handle this issue. The device allows
the user to program the required current sense voltage limit
SENSE+
R SENSE
SENSE–
Q 1
from 5 mV to 25 mV.
The default value of 20 mV is achieved by connecting the ISET
pin directly to the VCAP pin. This configures the device to use
VCC
×50
an internal 1 V reference, which equates to 20 mV at the sense
inputs (see Figure 46).
ISET
OVER-
CURRENT
GATE
VCAP
SS
FLB
GND
ADM1276
C1
Figure 44. Current-Limit Reference Selection
The foldback and soft start voltages vary during different modes
of operation and are, therefore, clamped to minimum levels of
200 mV and 100 mV, respectively, to prevent zero current flow
due to the current limit being too low. Figure 45 provides an
example of how the soft start, foldback, and ISET voltages interact
ISET
ADM1276
during startup as the ADM1276 is enhancing the FET and charging
the load capacitances. Depending on how the soft start and fold-
back features are configured, the hand-off point can vary to
ensure that the FET is being operated within the correct limits.
GND
Figure 46. Fixed 20 mV Current Sense Limit
To program the sense voltage from 5 mV to 25 mV, a resistor
divider is used to set a reference voltage on the ISET pin (see
Rev. C | Page 19 of 48
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