參數(shù)資料
型號： L6611DTR
廠商： 意法半導(dǎo)體
英文描述： DIGITALLY PROGRAMMABLE SECONDARY HOUSEKEEPING CONTROLLER
中文描述： 數(shù)字可編程控制器二次內(nèi)務(wù)管理
文件頁數(shù)： 19/28頁
文件大小： 609K
代理商： L6611DTR
19/28
L6611
pin#3) drives the external circuitry that biases the magamp core. Between these pins it is connected
the compensation network (Z
C
). The maximum positive output voltage is clamped at about 3.5V to
improve response time.
The feedback control circuit determines the magamp "off" time, converting the voltage at the output
of error amplifier into a current I
R
, which resets the magamp. If the output voltage exceeds its preset
value, V(B
out
) decreases; this causes a higher voltage across R
C
which, in turn, implies a larger volt-
age across R
E
and a larger reset current I
R
(V
BE
of Q
1
is supposed constant). A larger I
R
causes the
PWM waveform across D
2
to get narrower. This pulls the output voltage back to the desired level and
achieves regulation.
It is possible to use this section to drive a pass transistor to obtain 3.3V with a linear regulator; in the
"Application idea" section an example is showed to implement this solution.
Figure 16. Magamp control feedback section
–
Auxiliary section, error amplifier C.
This section (fig. 17) provides the feedback signal for the auxiliary converter following the same oper-
ating principles as the Main section. The auxiliary output voltage (Vaux) is often defined as "Standby
voltage" because the converter remains alive during standby condition (the Main converter is stopped)
to supply the chip and all the ancillary circuits. Typical values for its output voltage are 5V or 3.3V.
The inverting input (Cinv, pin#7) is connected to the output voltage through an external resistor divider
whereas the non-inverting one is connected to a 1.25V trimmable internal voltage reference (see "On
board trimming and mode operating" paragraph).
The compensation network Zc(aux) is placed between E/A inverting input and output pins.
When Dmon recognizes an undervoltage condition on the auxiliary output, an internal n-channel MOS
(in open drain configuration) grounds E/A output pin; the high current flowing through the optocoupler
is then transferred to the primary side causing a duty cycle as short as possible; this prevents a high
energy transfer from primary to secondary under short circuit conditions, thus reducing the thermal
stress on the power components.
Figure 17. Auxiliary feedback section
+3.3V
Zc
Bout
Binv
+1.25V
R
L
R
H
_
+
L6611
magamp
R
C
R
S
R
E
D
1
I
R
D
2
V
D2
Q
1
L
C
V
AUX
control
Zc(aux)
Cout
Cinv
R
B
+1.25V
R
H
R
L
_
+
L6611
OCP bounce
GND
DMON
to AUX
相關(guān)PDF資料
PDF描述
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L6615DTR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH/LOW SIDE LOAD SHARE CONTROLLER
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