参数资料
型号: MIC2544A-2YM TR
厂商: Micrel Inc
文件页数: 15/19页
文件大小: 0K
描述: IC SW CURR LIMIT HI SIDE 8SOIC
标准包装: 2,500
类型: 高端
输入类型: 非反相
输出数: 1
导通状态电阻: 80 毫欧
电流 - 峰值输出: 1.5A
电源电压: 2.7 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SOIC
包装: 带卷 (TR)
Micrel, Inc.
Setting I LIMIT
The MIC2544A/2548A’s current limit is user
programmable and controlled by a resistor connected
between the I LIMIT pin and ground. The value of this
resistor is determined by the following equation:
MIC2544A/2548A
Giving one a maximum I LIMIT variation over-temperature
of:
I LIMIT_MIN I LIMIT_TYP I LIMIT_MAX
0.79A (-21%) 1.0A 1.19A (+19%)
I LIMIT =
CurrentLim itFactor(CLF)
R SET
or
I_OUT
R_SET
I_OUT_Min
I_OUT_Max
R SET =
CurrentLim itFactor(V )
I LIMIT (A)
0.2
0.3
0.4
1150
767
575
0.140
0.210
0.280
0.260
0.390
0.520
For example: Set I LIMIT = 1.0A
Looking in the Electrical specifications we will find CLF
at I LIMIT = 1 A.
0.5
0.6
0.7
0.8
460
383
329
288
0.350
0.480
0.560
0.640
0.650
0.720
0.840
0.960
Min
184
Typ
230
Max
276
Units
V
0.9
1
256
230
0.720
0.800
1.080
1.200
Table 1. CLF at I LIMIT = 1A
For the sake of this example, we will say the typical
value of CLF at an I OUT of 1A is 230V. Applying the
equation above:
1.1
1.2
1.3
1.4
209
192
177
164
0.880
0.960
1.040
1.120
1.320
1.440
1.560
1.680
R SET ( Ω ) =
230V
1.0A
= 230 Ω
1.5
153
1.200
1.800
I LIMIT_MIN =
= 0 . 79 A
R SET = 232 ?
(the closest standard 1% value)
Designers should be aware that variations in the
measured I LIMIT for a given R SET resistor, will occur
because of small differences between individual ICs
(inherent in silicon processing) resulting in a spread of
I LIMIT values. In the example above a typical value of CLF
was used to calculate R SET . One can determine I LIMIT ’s
spread by using the minimum and maximum values of
CLF and the calculated value of R SET .
184V
232 Ω
Table 2. MIC2544A/2548A R SET Table
Short-Circuit Protection
In the event of a short circuit, the output current will fold
back to approximately 70% of the short-circuit current-
limit.
Fault Flag
FLG is an N-channel, open-drain MOSFET output. The
fault flag is active (low) for current-limit or thermal
shutdown conditions. The flag output MOSFET is
capable of sinking a 10mA load to typically 100mV
I LIMIT _ MAX =
April 2010
276 V
232 Ω
= 1 . 19 A
15
above ground. The FLG response delay time t D is
typically 5μs.
M9999-043010
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