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参数资料
| 型号： | MPM22CGA800A |
| 厂商： | INTEL CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 800 MHz, MICROPROCESSOR, XMA |
| 封装： | MMC-2 |
| 文件页数： | 44/68页 |
| 文件大小： | 966K |
| 代理商： | MPM22CGA800A |
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Pentium
III Processor Mobile Module MMC-2
Featuring Intel
SpeedStep Technology
243356-006
Datasheet
43
Figure 11. Current Shift Model
5.3.4.4
Current Limit Shift Point
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
.)
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.
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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