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參數(shù)資料
| 型號： | AN904 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | LJT 10C 10#20 PIN RECP |
| 中文描述： | 磁性放大器LPR30控制器 |
| 文件頁數(shù)： | 2/4頁 |
| 文件大小： | 60K |
| 代理商： | AN904 |
LPR30 CONTROLLER
Using the LPR30 like controller (as shown in fig.2) , in the PWM (Auxiliary Outputs) the pulse width is
controlled by sensing the output voltage comparing it (pin 6) to the internal reference (pin 4) and using
the Error signal to adjust the pulse duration. Without any MAG AMP plus controller, in the Auxiliary cir-
cuits the outputs would be " semi - regulated ", since the primary control loop would provide line regula-
tion. But the other output would vary with load and temperature.
Besides, the LPR30 controller plus MAG AMP is particularly advantageous when independent current
limiting for the auxiliary outputs is desired, due to the fact the LPR30 is able to monitor even the current.
It is always active and together with MAG AMP provides an exceptionaly smooth transition as the output
loaded beyond the current limit and then returned to normal load condition.
To do this job, the LPR30 uses its second internal comparator ( CURRENT LIMIT AMPLIFIER , pin 2
and pin 3 see fig.3) that has an artificial offset of 50mV.
This means that when the voltage to the R
SENSE
is more than 50mV, the CURRENT LIMIT AMPLIFIER
recognises that the current is more than the nominal one generating then an error signal that is applied
to the MAG AMP RESET TRANSISTOR.
The increase in reset current decreases the pulses width at the output of the MAG AMP and thus op-
poses the increase in current which was sensed by R
SENSE
.
V+
PWM
DRIVER
1
VIN
5
LIM-
3
LIM+
2
ERR-
7
VREF
ERR+
8
6
4
LPR30
Rsense
SR
CR1
L4
CR2
AUXILIARY Vout
-
+
CR3
+6
+
CURR.
LIM.
GND
REF
AMP.
ERR.
CR2
MAIN Vout
-
+
FEEDBAK
Figure 2.
1
VIN
5
LIM-
3
LIM+
2
ERR-
7
VREF
ERR+
8
6
4
LPR30
Rsense
SR
CR1
L4
CR2
Vout
-
+
CR3
+6
+
V+
PWM
CONTROLLER
CURR.
LIM.
GND
REF
AMP.
ERR.
CR4
CURRENT
CONTROL
Figure 3.
AN904 APPLICATION NOTE
2/3
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