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參數資料
| 型號： | L4909 |
| 廠商： | 意法半導體 |
| 英文描述： | EXTERNALLY ADJUSTABLE MULTIFUNCTION REGULATOR |
| 中文描述： | 外部可調多功能調節器 |
| 文件頁數： | 1/7頁 |
| 文件大小： | 61K |
| 代理商： | L4909 |
1/7
L4909
May 2000
I
3 OUTPUTS
- Vo1 : output voltage variable from 5 to 12 V;
limit current : 1.2 A.
- Vo2 : output voltage variable from 5 to 12 V;
limit current : 1.2 A.
- Vo3 : output voltage variable from 5 to 12 V;
limit current : 1.2 A.
I
ENABLE INPUT FOR EACH REGULATOR
I
FEEDBACK INPUT FOR EACH REGULATOR
I
SHORT CIRCUIT PROTECTION TO GROUND
I
OVERCURRENT WARNING
I
DRIVER FOR EXTERNAL SCR (CROWBAR
PROTECTION)
I
THERMAL SHUTDOWN
DESCRIPTION
It is a monolithic Multifunction Voltage Regulator; it
contains 3 regulators, (REG1, REG2, REG3) each
one with an enable input and a feedback input, to al-
low the voltage setting via external resistive divider.
Each regulator is current limited and furthermore an
OR-ed warning signal is output (open collector, ac-
tive low output) when the current in a regulator goes
above an over-current threshold (1 A typ for any reg-
ulator).
When one output voltage is higher than 20% typ of its
nominal value (for instance in case of input-to-output
short circuit), the crowbar output pin is activated, trig-
gering an external SCR (connected between input
and ground) that blows the input line fuse.
MULTIWATT15
EXTERNALLY ADJUSTABLE MULTIFUNCTION REGULATOR
BLOCKDIAGRAM
THERMAL
SHUTDOWN
OVER
CURRENT
CHECK
ENABLE
CONTROL
REFERENCE
GENERATOR
REG1
-
REG1
6
7
9
4
5
8
10
11
15
14
3,13
REF
REF+20%
1
2
EN1
EN2
EN3
TRIG
OC
GND
V
O1
V
INA,
V
INB
FB1
V
O2
FB2
V
O3
FB3
D00AU1171
REG2
REG3
+
+
+
+
+
+
+
-
+
-
+
-
+
+
REG2
-
+
REG3
-
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