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參數(shù)資料
| 型號： | MPM21CUA550B |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 550 MHz, MICROPROCESSOR, XMA |
| 封裝： | MMC-2 |
| 文件頁數(shù)： | 40/64頁 |
| 文件大?。?/td> | 826K |
| 代理商： | MPM21CUA550B |
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Celeron
Processor Mobile Module MMC-2
at 700 MHz, 650 MHz, 600 MHz, 550 MHz, 500 MHz, and 450 MHz
243357-005
Datasheet
39
Figure 10. Current Shift Model
5.3.4.4
Current Limit Shift Point
The comparator U1A should switch when the non-inverting input is equal to the 2.5-V reference on
the inverting input, or when the voltage applied to V_DC is equal to the selected switch point and
the voltage dropped across R36 is 2.5V. In this example, the change should occur when V_DC=
14.0V.
Equation 1.
(The nearest standard 1% value is 9.01 k
.)
The comparator U1A will pull its output low when V_DC falls below 14.0V, which will effectively
put R33 in parallel with R14.
When power is initially applied to the circuit, C18 charges up to 2.5V through R20. This slowly
rising voltage is applied to the base of the current source, Q1. The voltage on R14 is approximately
2.5V minus the base-emitter drop of about 0.7V (at 25°C): V(R14) ≈ 1.8V. Q1 is a 2N2222A with a
moderate
β of about 100. Therefore, the current through R13 is approximately equal to the current
through R14.
The charging of C18 provides a small increment of delay as U1 will not allow R4 to pull up the
Gate of M3 until Q1 has pulled the non-inverting input of U1 down slightly.
The voltage developed across R1 is a function of the load. See Equation 2 below.
Equation 2.
V(R1)= I_DC*R1
U1A
+in
V_DC
R36
R35
V_DC
Vref
()
Vref
R36
R35
14
2.5
()
2.5
2000
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| MPM-25S-15 | 制造商:MPD 制造商全稱:MicroPower Direct, LLC 功能描述:Universal Input, 25W Miniature, PC Mount AC/DC Power Supplies |
| MPM-25S-24 | 制造商:MPD 制造商全稱:MicroPower Direct, LLC 功能描述:Universal Input, 25W Miniature, PC Mount AC/DC Power Supplies |
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