參數(shù)資料
型號: Pentium III cpu with mobile
廠商: Intel Corp.
英文描述: Pentium III processor Mobile Module Connector 2 (MMC-2)(帶移動模塊連接器2奔III處理器)
中文描述: 奔騰III處理器的移動模塊連接器2(絲裂霉素2)(帶移動模塊連接器2奔三處理器)
文件頁數(shù): 49/64頁
文件大?。?/td> 773K
代理商: PENTIUM III CPU WITH MOBILE
Pentium
III Processor Mobile Module MMC-2
245304-003
Datasheet
43
5.3.4.6
Undervoltage Lockout
The circuit below shows the Undervoltage Lockout portion of the V_DC Supply circuit. This
circuit protects and locks out the applied voltage to the mobile module to prevent an accidental
turn-on at low V_DC supply voltages.
Warning:
A low voltage applied to the mobile module could result in destructive current levels.
Figure 11. Undervoltage Lockout
The output of the LM339 comparator is an open-collector and is low when the applied voltage at
V_DC is less than 7.5V, which holds the Gate of M3 low. Consequently, the Slew Rate Controller
is not allowed to turn on. The 2.5-V reference, V
ref
, voltage is derived from D7 in
Figure 9
. When
the non-inverting input of the comparator exceeds V
ref
, 2.5V, the comparator trips and allows its
output to go to a High Z state. The Gate of M3 can then be pulled up by R4, starting the controlled
Power-up Slew.
The model in
Figure 12
will be used to calculate the Undervoltage Lockout trip point.
Undervoltage Lockout
V_DC_A
R4
M3 Gate
Vref
2.5V
V_DC
V_DC
LM339
R25
R18
R17
Let V_DC_UVlock=7.5V
Let R17=10 k
Let R25=1 m
Let VCEsat= 0.3V
Let Vref=2.5V
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