参数资料
| 型号： | PI2161-EVAL1 |
| 厂商： | Vicor Corporation |
| 文件页数： | 5/18页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD FOR PI2161 |
| 标准包装： | 1 |
| 系列： | Picor®, Cool-Switch® |
| 主要目的： | 电源管理，高端驱动器（内部 FET） |
| 嵌入式： | 否 |
| 已用 IC / 零件： | PI2161 |
| 已供物品： | 板 |
| 其它名称： | 1102-1061 |
?
Functional Description:
The PI2161 integrated Cool-Switch product takes
advantage of two different technologies combining low
R DS(on) N-channel MOSFETs with high density control
K S ?
I SL
I Load
?
12 * R DS ( on )
144 * R DS ( on ) ? ( Rs ? 17 . 5 ) * ( 11 )
circuitry to provide a high side fast Circuit Breaker
solution. The PI2161’s 8.5m ? on state resistance
Where:
MOSFET minimizes the voltage drop, at the maximum
rated current of 12A, significantly reducing power
dissipation and eliminating the need for heat sinking.
As shown in the typical application Figure 1 and the
block diagram Figure 5, the unique aspect of the load
current sensing scheme is that only a small portion of
the total MOSFET source current is routed through
the sense resistor (Rs). This allows using a much
lower power component compared to the conventional
method of sensing the total current to the load. Figure
5, Figure 6 and Figure 7 show the PI2161 block
diagram, timing diagram and state diagram
respectively.
Rs :
R DS ( on ) :
K S :
I SL :
I Load :
6.6
6.4
6.2
6.0
5.8
Sense Resistor value in [mΩ]
MOSFET ON resistance value [mΩ]
Current sense ratio
SL sense current [A]
Load Current [A]
Typical Rds(on) at 25°C = 8.5m Ω
Jun
Tem
per
re =
Te
pe
u re
5°C
125
Differential Amplifier:
The PI2161 integrates a high-speed fixed offset
voltage differential amplifier to sense the difference
between the Sense Positive (SP) pin and Sense
Negative (SN) pin voltage. The amplifier output is
connected to the control logic that determines the
state of the fault latch. To avoid tripping the breaker
due to load capacitance during initial power up, a
5.6
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
3.8
3.6
Jun
ctio
n
ctio n
m
ra t
atu
=2
°C
higher threshold (V OC-THH ) is used. The amplifier will
3.4
detect if the drop across the sense resistor reaches
166mV and discharge the gate of the MOSFET if
detected. Once the load voltage approaches the input
3.2
30
40
50
60
70 80 90 100 110
Sense Resistor Value [m Ω ]
120
130
140
150
potential, the threshold (V OC-THL ) is lowered to 70mV.
Figure 3: Current ratio vs. sense resistor over
This allows for
capacitive load charging and
temperature
continuous current sensing without the use of a sense
blanking timer.
Current Sense:
The PI2161 internal MOSFET source is split into two
portions, Source High current (SH) and Source Low
current (SL). SH conducts the majority of the current
and SL conducts a small portion of the load current.
SL current is routed through the sense Resistor (Rs)
for current sensing.
The value of the sense Resistor in the path of the
sense current, will create a voltage drop and have an
25°C and 125°C over a range of sense resistor
values.
The equations and an example for calculating Rs
value for a trip current level and the equation for the
trip current at a given sense resistor value are
provided in the Application Information section.
Enable Input: ( EN )
This input provides control of the switch state enabling
and disabling with logic level signals. The active low
effect on the current ratio K S .
The current ratio is
feature allows grounding or floating of the input
expressed in the following equation as a function of
R DS(on) and Rs.
Note that the MOSFET R DS(on) value is temperature
dependent and temperature will effect the current
ratio. For one R DS(on) value the current ratio is
resulting in switch closure upon application of input
power. System control can disable the switch and
reset the over current latch by pulling this pin to a
logic high state.
Once enabled the load voltage will reach the input
constant with respect to the load current.
Current
voltage in typically 1 ms and the device will sense the
ratio vs. sense resistor over temperature performance
current continuously once the POR interval has
cleared relative to the VC to PG potential. The disable
control with this input is very fast, turning the switch
off in typically 200ns. The response to open during an
Picor Corporation ? pi corpower.com
PI2161
Rev 1.1 , Page 5 of 18
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