參數(shù)資料
型號: L99PM62XP
廠商: STMICROELECTRONICS
元件分類: 電源管理
英文描述: 4-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO36
封裝: ROHS COMPLIANT, POWERSSO-36
文件頁數(shù): 6/98頁
文件大?。?/td> 1117K
代理商: L99PM62XP
Description
L99PM62XP
Doc ID 16363 Rev 2
The circuit in Figure 4 provides additional current limitation using an additional PNP
transistor and R6 which allows setting the current limit.
Figure 5.
Voltage source with external NPN
Figure 6.
Voltage source with external NPN and current limitation
Figure 5 shows a possible configuration with an NPN pass element using voltage regulator
2 to provide the voltage reference for the regulated output voltage V3. This circuit requires
fewer components compared to the configuration in Figure 3 but has a limited Vs operating
range (6 V to 18 V).
The output voltage V3 can be calculated using the following formula:
The circuit in Figure 6 provides additional current limitation using an additional NPN
transistor and R5 which allows setting the current limit.
Alternatively, voltage regulator 1 can be used to provide the 5 V reference for this topology.
However, the additional current consumption through R3 and R4 has to be considered in
V1standby mode.
2.1.4
Voltage regulator failure
The V1, and V2 regulator output voltages are monitored.
In case of a drop below the V1, V2 – fail thresholds (V1,2 < 2 V, typ for t > 2 s), the V1,2-fail
bits are latched. The fail bits can be cleared by a dedicated SPI command.
V2
Ci
+
-
C3
Cem
C1
Vs
V3
C2
L99PM62
R3
R4
R2
MJD31C
OPx_OUT
OPx -
OPx +
R1
V2
Ci
+
-
C3
Cem
C1
Vs
V4
C2
L99PM62
R3
R5
R4
R1
R2
MJD31C
BC856
OPx_OUT
OPx -
OPx +
v
3
v
2
------
R
1
R
2
+
R
2
--------------------- V
[]
=
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